vacuum based photon detectors
DESCRIPTION
Vacuum based Photon Detectors. Katsushi Arisaka. University of California, Los Angeles Department of Physics and Astronomy [email protected]. Outline. Concept of Photomultiplier Basic Properties QE, Gain, Time Response Imperfect Behavior of PMT Linearity, Uniformity , Noise… - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/1.jpg)
1
University of California Los Angeles
Department of Physics and Astronomy
arisakaphysicsuclaedu
Vacuum basedPhoton Detectors
Katsushi Arisaka
10282012 Katsushi Arisaka UCLA
2
Outline Concept of Photomultiplier Basic Properties
QE Gain Time Response Imperfect Behavior of PMT
Linearity Uniformity Noisehellip Other Vacuum Devices
Hybrid PDAPD Applications
Energy Resolution Summary
10282012 Katsushi Arisaka UCLA
3
Concept of PMT
10282012 Katsushi Arisaka UCLA
4
PMT (Photomultiplier Tube)
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 51028201211200 of 20rdquo PMTs
Super-Kamiokande
610282012 Katsushi Arisaka UCLA
![Page 2: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/2.jpg)
2
Outline Concept of Photomultiplier Basic Properties
QE Gain Time Response Imperfect Behavior of PMT
Linearity Uniformity Noisehellip Other Vacuum Devices
Hybrid PDAPD Applications
Energy Resolution Summary
10282012 Katsushi Arisaka UCLA
3
Concept of PMT
10282012 Katsushi Arisaka UCLA
4
PMT (Photomultiplier Tube)
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 51028201211200 of 20rdquo PMTs
Super-Kamiokande
610282012 Katsushi Arisaka UCLA
![Page 3: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/3.jpg)
3
Concept of PMT
10282012 Katsushi Arisaka UCLA
4
PMT (Photomultiplier Tube)
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 51028201211200 of 20rdquo PMTs
Super-Kamiokande
610282012 Katsushi Arisaka UCLA
![Page 4: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/4.jpg)
4
PMT (Photomultiplier Tube)
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 51028201211200 of 20rdquo PMTs
Super-Kamiokande
610282012 Katsushi Arisaka UCLA
![Page 5: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/5.jpg)
Katsushi Arisaka UCLA 51028201211200 of 20rdquo PMTs
Super-Kamiokande
610282012 Katsushi Arisaka UCLA
![Page 6: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/6.jpg)
610282012 Katsushi Arisaka UCLA
![Page 7: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/7.jpg)
Operation of Head-On Type PMT
signal light-gtphotoelectron photoelectron-gtDy1 electron-gt multiplication
cascade multiplication electric signal from anode
10282012 Katsushi Arisaka UCLA 7
Katsushi Arisaka UCLA 810282012
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
Katsushi Arisaka UCLA 910282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 1010282012
FAQWhy still PMT Why not Silicon
Photodiode
Intrinsically high gainLow noise ndash photon countingFast speedLarge area
butPoor Quantum EfficiencyBulkyExpensive
11
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12
Basic Properties
10282012 Katsushi Arisaka UCLA
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 8: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/8.jpg)
Katsushi Arisaka UCLA 810282012
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
Katsushi Arisaka UCLA 910282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 1010282012
FAQWhy still PMT Why not Silicon
Photodiode
Intrinsically high gainLow noise ndash photon countingFast speedLarge area
butPoor Quantum EfficiencyBulkyExpensive
11
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12
Basic Properties
10282012 Katsushi Arisaka UCLA
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 9: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/9.jpg)
Katsushi Arisaka UCLA 910282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 1010282012
FAQWhy still PMT Why not Silicon
Photodiode
Intrinsically high gainLow noise ndash photon countingFast speedLarge area
butPoor Quantum EfficiencyBulkyExpensive
11
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12
Basic Properties
10282012 Katsushi Arisaka UCLA
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 10: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/10.jpg)
Katsushi Arisaka UCLA 1010282012
FAQWhy still PMT Why not Silicon
Photodiode
Intrinsically high gainLow noise ndash photon countingFast speedLarge area
butPoor Quantum EfficiencyBulkyExpensive
11
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12
Basic Properties
10282012 Katsushi Arisaka UCLA
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 11: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/11.jpg)
11
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12
Basic Properties
10282012 Katsushi Arisaka UCLA
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 12: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/12.jpg)
12
Basic Properties
10282012 Katsushi Arisaka UCLA
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 13: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/13.jpg)
Outline
Fundamental Parameters of PMT Quantum Efficiency (QE) Photoelectron Collection Efficiency (CE) Gain (G) Excess Noise Factor (ENF)
How to Measure These Parameters
Energy Resolution (E)
10282012 Katsushi Arisaka UCLA 13
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 14: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/14.jpg)
14
Quantum Efficiency (QE)
10282012 Katsushi Arisaka UCLA
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 15: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/15.jpg)
Quantum Efficiency (QE)Definition
The single most important quantityN
NPhotonsInsident
ronsPhotoelectEmittedQE
pe
)_(
)_(
10282012 Katsushi Arisaka UCLA 15
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 16: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/16.jpg)
QE curves of 6 types
01
1
10
100
100 200 300 400 500 600 700 800 900 1000
Wavelength (nm)
QE
()
Cs-Te
GaAsP
Extended RedMultialkali (S-25)
Multialkali (S-20)
Bialkali GaAs
Quantum Efficiency with 6 types of Photocathodes
VUV UV Visible Infra-Red
10282012 Katsushi Arisaka UCLA 16
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 17: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/17.jpg)
Katsushi Arisaka UCLA 1710282012
Typical QE
BialkaliSb-Rb-CsSb-K-Cs
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 18: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/18.jpg)
18
Transmittance of windows
popular
VisibleUVVUV
More Expensive
Wavelength is Shorter
10282012 Katsushi Arisaka UCLA
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 19: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/19.jpg)
FAQ
Why is QE limited to ~40 at best
Competing two factorsbull Absorption of photonbull Emission of photo-electrons
Isotropic emission of photo-electrons
10282012 Katsushi Arisaka UCLA 19
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 20: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/20.jpg)
FAQHow can we measure QE
Connect all the dynodes and the anodeSupply more than +100V for 100
collection efficiencyMeasure the cathode current (IC)Compare IC with that of a reference
photon-detector with known QE
10282012 Katsushi Arisaka UCLA 20
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 21: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/21.jpg)
UCLA QE System
Reference PMT PMT with unknown QE
Xe Lamp
Source PMT
Monochromator
Integrating Sphere
reference
unknownreferenceunknown I
IQEQE
10282012 21Katsushi Arisaka UCLA
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 22: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/22.jpg)
22
UCLA Vacuum UV QE System
PDPMT
W LampD2 Lamp
MonochromatorUCLA
Hamamatsu
10282012 Katsushi Arisaka UCLA
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 23: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/23.jpg)
2310282012 Katsushi Arisaka UCLA
Propagation Chain of Absolute Calibration of Photon Detectors
Cryogenic Radiometer
Trap Detector
Pyroelectric Detector
Laser(s)
NIST standard UV Si PD
Reference PMTReal Light Source
Monochromator
UV LEDXe LampLaser(s)
Particle Beam
Real experiments PMTs in our detectors
Light BeamScattered Light
NIST
us
NIST standard UV Si PD
Standard Light Beam
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 24: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/24.jpg)
2410282012 Katsushi Arisaka UCLA
NIST High Accuracy Cryogenic Radiometer (HACR)
Photon energy is converted to heat
Heat is compared with resistive (Ohmic) heating
0021 accuracy at 1mW
This is the origin of absolute photon intensity
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 25: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/25.jpg)
2510282012 Katsushi Arisaka UCLA
Trap Detector
Front View Bottom View
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 26: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/26.jpg)
NIST Standards Quantum efficiencies of typical Si InGaAs and Ge photodiodes
10282012 Katsushi Arisaka UCLA 26
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 27: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/27.jpg)
Sk (Cathode Sensitivity)and Skb (Cathode Blue Sensitivity)
Filter for Skb Lump for Sk10282012 Katsushi Arisaka UCLA 27
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 28: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/28.jpg)
Collection Efficiency (CE)
Definition
)_()_1___(
ronsPhotoelectEmittedDynodestbycapturedPECE
10282012 Katsushi Arisaka UCLA 28
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 29: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/29.jpg)
FAQ
How can we measure Collection Efficiency
Measure the Cathode current (IC)Add 10-5 ND filter in front of PMTMeasure the counting rate of the single
PE (S)Take the ratio of S1610-19 105IC
10282012 Katsushi Arisaka UCLA 29
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 30: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/30.jpg)
Detective Quantum Efficiency (DQE)
Definition
bull Often confused as QE by ldquoPhysicistsrdquo
CEQEPhotonsInsident
DynodestbycapturedPEDQE
)_(
)_1___(
10282012 Katsushi Arisaka UCLA 30
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 31: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/31.jpg)
FAQHow can we measure Detective QE
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the counting rate of the single PE (S)
Compare S with that of PMT with known DQE
10282012 Katsushi Arisaka UCLA 31
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 32: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/32.jpg)
32
Dynode Structure
10282012 Katsushi Arisaka UCLA
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 33: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/33.jpg)
PMT Types
lt SIZE gt 12 inch amp 1-18 inchlt Features gt Compact Relatively Cheap
lt SIZE gt 38 inch ~ 20 inchlt Features gt Variety of sizes Direct coupling
lt SIDE-ON TYPE gt lt HEAD-ON TYPE gt
10282012 Katsushi Arisaka UCLA 33
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 34: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/34.jpg)
Dynode Structures ndash Side-on vs Head-on
CIRCULAR CAGE
CompactFast time response(mainly for Side-On PMT)
Good CE(Good uniformity)Slow time response
BOX amp GRID
lt SIDE-ON gtlt HEAD-ON gt
10282012 Katsushi Arisaka UCLA 34
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 35: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/35.jpg)
LINEAR FOCUSED (CC+BOX)
Fast time responseGood pulse linearity
VENETIAN BLIND
Large dynode areaBetter uniformity
Dynode Structures ndash Linear Focus vs Venetian Blind
Larger DY1 is used in recent new PMTs (Box amp Line)
10282012 Katsushi Arisaka UCLA 35
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 36: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/36.jpg)
Metal Channel PMT
CompactFast time responsePosition sensitive
PMT with Metal Channel Dynode
16mm in dia
METAL CHANNEL
Pitch1mm
TO-8 type PMT
10282012 Katsushi Arisaka UCLA 36
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 37: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/37.jpg)
37
Fine Mesh PMT
10282012 Katsushi Arisaka UCLA
Fine Mesh
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 38: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/38.jpg)
MCP (Micro Channel Plate)
Gain = 100 - 1000
( 5 ndash 10 μm ϕ)
10282012 Katsushi Arisaka UCLA 38
MCP
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 39: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/39.jpg)
39
MCP PMT
10282012 Katsushi Arisaka UCLA
MCP PMTImage Intensifier
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 40: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/40.jpg)
Principle of Image Intensifier
httpwwwe-radiographynetradtechiintensifierspdf
10282012 Katsushi Arisaka UCLA 40
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 41: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/41.jpg)
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
10282012 Katsushi Arisaka UCLA 41
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 42: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/42.jpg)
42
Gain of PMT
10282012 Katsushi Arisaka UCLA
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 43: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/43.jpg)
Structure of Linear-focus PMT
Mesh Anode Last Dynode
Photo CathodeSecond Last DynodeFirst Dynode
Glass Window
Photons
QE
CE1
2
3
n
N
G = 123 n
E=NQECEG
10282012 Katsushi Arisaka UCLA 43
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 44: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/44.jpg)
Secondary electron Emission
HV06
10282012 Katsushi Arisaka UCLA 44
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 45: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/45.jpg)
Gain (GP)
Definition by Physicists
nPG 321
(i = Gain of the i-th dynode)
nP HVG 60
10282012 Katsushi Arisaka UCLA 45
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 46: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/46.jpg)
Katsushi Arisaka UCLA 4610282012
FAQ
How can we measure the Gain (GP) of our definition
Use a weak pulsed light source (so that gt90 pulse gives the pedestal)
Measure the center of the mass of Single PE charge distribution of the Anode signal (QA)
Take the ratio of QA1610-19
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 47: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/47.jpg)
47
Single PE distribution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 48: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/48.jpg)
Katsushi Arisaka UCLA 4810282012
Gain (GI)
Definition by Industries
nI CEG 321
(i = Gain of the i-th dynode)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 49: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/49.jpg)
Katsushi Arisaka UCLA 4910282012
FAQHow do manufactures measure the
real Gain (GI)
Measure the Cathode current (IC) Add 10-5 ND filter in front of PMT Measure the Anode current (IA) Take the ratio of IA105IC
PI GCEG
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 50: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/50.jpg)
Katsushi Arisaka UCLA 5010282012
Gain vs Voltage Curve
Physicists Definition
GP=δ1bullδ2bullhellip bullδn
Industries Definition
GI=CEbullδ1bullδ2bullhellip bullδn
CE=GIGP~80
GP by UCLA
GI by Photonis
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 51: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/51.jpg)
Katsushi Arisaka UCLA 5110282012
270 Auger-SD PMTs HV for G=2105
UCLA vs Photonis
HV varies from PMT to PMT
Photonis is Higher than UCLA (due to CE)
CE varies from PMT to PMT
UCLA
Photonis
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 52: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/52.jpg)
Katsushi Arisaka UCLA 5210282012
FAQ
Why is the Gain so different from PMT to PMT at the fixed HV
At given HV each may be 10 different Then Gain could be an order of magnitude
different (G = 123 n)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 53: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/53.jpg)
Katsushi Arisaka UCLA 5310282012
FAQ
What is the maximum allowed HV for stable PMT operation
It can be checked by Dark Current behavior
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 54: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/54.jpg)
Katsushi Arisaka UCLA 5410282012
Gain and Dark Current vs HV
ThermalPhotoelectronEmission
LeakageCurrent
FieldEffect
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 55: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/55.jpg)
Katsushi Arisaka UCLA 5510282012
Temperature Dependence of Anode Sensitivity
-04oC
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 56: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/56.jpg)
56
Two Types of Voltage Divider
lt-HV Operationgt
lt+HV OperationgtPulse operation only
No DC output
10282012 Katsushi Arisaka UCLA
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 57: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/57.jpg)
57
Time Response
10282012 Katsushi Arisaka UCLA
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 58: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/58.jpg)
58
Time Response
TTSTransit Time Spread
(Variation of Transit Time)
Transit Time
RISE TIME10 to 90
FALL TIME90 to 10
Example ofWaveform
Rise 15 nsFall 27 ns
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 59: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/59.jpg)
Katsushi Arisaka UCLA 5910282012
Typical TTS (Transit Time Spread)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 60: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/60.jpg)
Katsushi Arisaka UCLA 6010282012
Transit Time vs HV
Higher VoltageFaster Transit Time
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 61: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/61.jpg)
61
Time Properties (R11410)
10282012 Katsushi Arisaka UCLA
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 62: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/62.jpg)
6210282012
Time Resolution vs Sensitive Area
HPD
SiPM
Katsushi Arisaka UCLA
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 63: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/63.jpg)
63
Imperfect Behavior of PMT
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 64: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/64.jpg)
Katsushi Arisaka UCLA 6410282012
Uncertainties Specific to PMTsPMTs are not perfect There are many
issues to be concerned
Non Linearity Cathode and Anode Uniformity Effect of Magnetic Field Temperature Dependence Dark Counts After Pulse Rate Dependence Long-term Stability
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 65: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/65.jpg)
65
Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 66: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/66.jpg)
Katsushi Arisaka UCLA 6610282012
PMT Non LinearityNon Linearity is the effect of the space charge
mainly between the last and the second last dynode
Mesh Anode Last Dynode
Photo Cathode Second Last Dynode
First Dynode
Glass Window
Photons
QECol
1
2
3
n
N
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 67: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/67.jpg)
67
Pulse Linearity
What is Pulse Linearity Relation between radiation energy and PMT output
Devi
atio
n fro
m id
eal l
ine
()
PMT output peak current (mA)PMT output
Radi
atio
n En
ergy
Ligh
t Int
ensi
ty
10282012 Katsushi Arisaka UCLA
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 68: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/68.jpg)
68
Block Diagram for Double-Pulsed Mode
Dim 1 Bright 4
Pulse Linearity
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 69: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/69.jpg)
Katsushi Arisaka UCLA 69
Optimization of Anode Pulse Linearity
10282012
(The last 3 stages)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 70: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/70.jpg)
70
Linearity at different gainsLow gain (1000V) High gain (1500V)
10282012 Katsushi Arisaka UCLA
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 71: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/71.jpg)
71
Uniformity
10282012 Katsushi Arisaka UCLA
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 72: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/72.jpg)
72
Anode Uniformity
spot light
SLIT shapeIncident light
Large size ofIncident light
10282012 Katsushi Arisaka UCLA
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 73: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/73.jpg)
73
Cathode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 74: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/74.jpg)
74
Anode Uniformity (3 inch PMT)
10282012 Katsushi Arisaka UCLA
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 75: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/75.jpg)
75
Collection Efficiency (=AnodeCathode)
(KA0044)
10282012 Katsushi Arisaka UCLA
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 76: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/76.jpg)
76
Effect of Magnetic Field
10282012 Katsushi Arisaka UCLA
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 77: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/77.jpg)
7710282012
Effect of Magnetic Fields
MetalChannel
FineMesh
MCPPMT
SolidState
LinearFocus
HPDAPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 78: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/78.jpg)
Katsushi Arisaka UCLA 7810282012
Typical Magnetic Field Effect
Earth B-Field
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 79: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/79.jpg)
Katsushi Arisaka UCLA 7910282012
xy
z
Effect of Magnetic Field on Liner-focus 2rdquo PMT
Hamamatsu 2rdquo PMT (R7281-01)
Earth B-Field
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 80: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/80.jpg)
Katsushi Arisaka UCLA 8010282012
Edge Effect of Magnetic Shields
For effective shieldingwe need extra mu-metalin front
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 81: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/81.jpg)
81
Dark Count
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 82: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/82.jpg)
Katsushi Arisaka UCLA 8210282012
Temperature Dependence of Dark Current
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 83: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/83.jpg)
83
Dark Count Rate vs Temperature
10282012 Katsushi Arisaka UCLA
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 84: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/84.jpg)
84
After Pulse
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 85: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/85.jpg)
Katsushi Arisaka UCLA 8510282012
After Pulse (R11410)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 86: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/86.jpg)
Katsushi Arisaka UCLA 8610282012
After Pulse by Helium
Helium Contaminated PMT from MACRO
gt 10
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 87: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/87.jpg)
87
Long Term Stability
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 88: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/88.jpg)
Katsushi Arisaka UCLA 8810282012
Typical Long-term Stability
From Hamamatsu PMT Handbook
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 89: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/89.jpg)
89
Other Vacuum Devices
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 90: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/90.jpg)
Katsushi Arisaka UCLA 9010282012
Principle of Silicon Photodiode
Gain = 10 QE ~ 100 Extremely
Stable Large
Dynamic Range
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 91: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/91.jpg)
Katsushi Arisaka UCLA 9110282012
APD (Avalanche Photodiode)
High Gain (100-1000) High QE (~70)Then why not replace PMTsDrawbacks
lt2 ENFgt2 Effectively QE lt35 Extremely Sensitive to Temperature and
Voltage change Difficult to manufacture uniform large area
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 92: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/92.jpg)
Katsushi Arisaka UCLA 9210282012
In vacuum Silicon Photodiode instead of dynodes
High Gain (1000-3000) we can count 1-5 photoelectrons
Then why not replace PMTs
HPD (Hybrid Photodiode)
Photo Cathode
Silicon PDe-
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 93: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/93.jpg)
9310282012
CMS Detector under 4 Tesla
4 TeslaEM Hadron
APD HPDKatsushi Arisaka UCLA
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 94: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/94.jpg)
9410282012
CMS HCAL Multi pixel HPD (DEP)
PIN Diode array
Ceramic feedthrough
Fiber-OpticWindow
Photocathode (-10 kV)
e
19 channel pixel layout
pixel size 54 mm flat-flatgap between pixels 004 mm
34 mm
Katsushi Arisaka UCLA
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 95: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/95.jpg)
9510282012
LHCb experiment
Katsushi Arisaka UCLA
RICHRICH
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 96: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/96.jpg)
9610282012
The pixel HPD by DEP (for LHCb)
Advantages of this hybrid pixel structurelow noise excellent resolution of single photoelectronshigh channel numberdensity
DEP The Netherlands
Katsushi Arisaka UCLA
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 97: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/97.jpg)
10282012 Katsushi Arisaka UCLA 97
Hamamatsu Hybrid APD
Single Channel HAPD
64 Channel HAPD+ Readout
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 98: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/98.jpg)
1 2 3 hellip Photo-electron Distribution
10282012 Katsushi Arisaka UCLA 98
12 3
4
5
6 Photo-electrons
True photon counting
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 99: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/99.jpg)
Decay Time Measurement by HAPD
10282012 Katsushi Arisaka UCLA 99
Time Resolution = 80 psec
FWHM = 15 ns
No after pulse
Pulse Shape
Decay Time
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 100: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/100.jpg)
100
Leica HyD Detector for Confocal Microscope
10282012 Katsushi Arisaka UCLA
HamamatsuCompact HAPDwith GaAsP
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 101: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/101.jpg)
Katsushi Arisaka UCLA 10110282012
8 inch HAPD by Hamamatsu
New releaseat NSS 2012
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 102: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/102.jpg)
10282012 Katsushi Arisaka UCLA 102
Water Tank
LiquidScinti
Water Tank
Xe 20 ton (10 ton) 40Ar 70 ton (50 ton)
15 m6 m
LiquidScinti
Xe Ar
MAX G3 Dark Matter Detector
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 103: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/103.jpg)
Photo Cathode(-6 kV)
APD (0 V)
Quartz
Quartz
Al coating
APD (0 V)
Photo Cathode(-6 kV)
QUPID (QUartz Photon Intensifying Detector)
10282012 103Katsushi Arisaka UCLA
Made by Synthetic Silica only
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 104: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/104.jpg)
104
Production Version QUPID
10282012 Katsushi Arisaka UCLA
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 105: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/105.jpg)
1 2 and 3 PE Distribution with 2m cable
10282012 Katsushi Arisaka UCLA 105
2 PE
3 PE
1 PE
G = 800 times 200 = 160000
TTS = 160 ps (FWHM)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 106: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/106.jpg)
Katsushi Arisaka UCLA 10610282012
Intevac Electron Bombarded CMOS
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 107: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/107.jpg)
Katsushi Arisaka UCLA 10710282012
EBAPS by Intevac
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 108: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/108.jpg)
108
Energy Resolution
10282012 Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 109: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/109.jpg)
Katsushi Arisaka UCLA 10910282012
Anode Signal (E) Definition
p
pol
IpeI
n
GDQEN
GCQEN
GNGQEN
CEQENE
321
(by Industries)
(by Physicists)
(N = No of Incident Photons)(Npe = No of Photo-electrons)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 110: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/110.jpg)
11010282012
In ideal case
In reality
ndash N Number of incident photonsndash QE Quantum Efficiencyndash CE Collection Efficiencyndash ENF Excess Noise Factor (from Dynodes)ndash ENC Equivalent Noise Charge (Readout Noise)ndash G Gain
Energy Resolution (E)
NN
NE
1
2ENF ENC
E N QE CE N QE CE G
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 111: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/111.jpg)
Katsushi Arisaka UCLA 11110282012
Excess Noise Factor (ENF) Definition
In case of PMT
How to measure Set Npe = 10-20 (for nice Gaussian) Measure E of the Gaussian distribution ENF is given by
2
2
Input
OutputENF
n
ENF
21211
1111
CENEENF pe 2
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 112: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/112.jpg)
Katsushi Arisaka UCLA 11210282012
Single PE Distribution
of the single PE distribution is given by
Thus ENF is related to Peak to Valley Ratio
1
111
21211_
ENF
E nPESingle
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 113: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/113.jpg)
Katsushi Arisaka UCLA 11310282012
Single PE Distribution To see single PE
tune light intensity so that gt90 gives pedestal
If 1 gtgt5 ENFlt14 Clear single PE can be seen
The true position is given by the ldquoCenter of Massrdquo including signal below the pedestal
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 114: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/114.jpg)
Katsushi Arisaka UCLA 11410282012
ENF vs PV Ratio of 270 Auger-SD PMTs
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 115: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/115.jpg)
Katsushi Arisaka UCLA 11510282012
FAQ
When should we use PMT and when should we use Silicon Photodiode
Depends on intensity of photons Depends on speed of signals
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 116: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/116.jpg)
Katsushi Arisaka UCLA 11610282012
Resolution of Hybrid Photodiode (HPD)
HPD can count 1 2 3hellip PE separately 1 gt1000 ENF=10
But it is still suffering from poor QE We can never beat the Poisson statistics
200 300 400 500 600ADC Channel
Pedestal
1 pe NIM A 442 (2000) 164-170
3 pe
2 pe
4 pe
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 117: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/117.jpg)
11710282012
Summary Table
QE CE i ENF G ENC E
Ideal 10 10 1000 10 106 0 1N
PMT 035 09 10 13 106 200 38N
PD 07 10 - 10 1 200 14N+(280N)2
APD 07 10 2 20 100 200 29N+(29N)2
HPD 05 09 1000 10 103 200 22N+(04N)2
HAPD 05 09 1000 10 105 200 22N
SiPM 07 04 1000 13 106 1000 43N
VLPC 07 10 1000 10 105 200 14N
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 118: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/118.jpg)
Katsushi Arisaka UCLA 11810282012
Energy Resolution vs N
Noof Photons
100 101 102 103 104 105 106 107
Ene
rgy
Res
olut
ion
0001
001
01
1
10
Poisson Limit
Photo Diode
APDHPD
PMT
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 119: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/119.jpg)
11910282012
10
15
20
25
30
1 10 100 1000 10000 100000 1000000 10000000Photon
Reso
lutio
n P
oiss
onResolution (over Poisson Limit)
PMT (35 QE)
HPD (50 QE)
APD PD
HAPD
VLPC
SiPM
G-APD
Katsushi Arisaka UCLA
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 120: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/120.jpg)
120
Summary
10282012 Katsushi Arisaka UCLA
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 121: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/121.jpg)
121
Purpose of Photon Detector
Observe all the quantities of photons as accurate as possible The number of photons E Arrival time of photons T Position of photons X Y Z
Primary purpose of vacuum detectors Very small number of photons lt 100 photons Accurate time of photons lt 10 nsec
10282012 Katsushi Arisaka UCLA
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 122: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/122.jpg)
12210282012
Market Price
SiPM
Silicon
HPD
Katsushi Arisaka UCLA
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 123: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/123.jpg)
Katsushi Arisaka UCLA 12310282012
FAQrsquos Why do we have to operate each PMT at different
HV Why is PMT response non-uniform over surface What is the cause of non-linearity How stable is PMT How often should we
calibrate Every minute Every day What external facts could change the Gain of
PMT What could damage PMTs permanently
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 124: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/124.jpg)
Katsushi Arisaka UCLA 12410282012
More FAQrsquos What is the source of dark current and dark
pulse Are they correlated Why is PMT still the best for photon counting
application Why is APD or HPD not widely used Then who uses APD or HPD Why is the signal of PMT so fast
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 125: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/125.jpg)
125
Closing RemarksPMTs are still used in many applications for good
reasons Intrinsically high gain Extremely low noise ndash photon counting Fast speed ( lt 1 ns) Large area ( gtgt 5 inch)
However PMTs are not perfect There are many issues to be concerned Cathode and Anode Uniformity Non Linearity Effect of Magnetic Field Long-term Stability
10282012 Katsushi Arisaka UCLA
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-
![Page 126: Vacuum based Photon Detectors](https://reader035.vdocuments.us/reader035/viewer/2022081421/568164ce550346895dd6f786/html5/thumbnails/126.jpg)
126
References
Hamamatsu PMT Handbook httpsaleshamamatsucomassets
applicationsETDpmt_handbook_completepdf
Special thanks to Yuji Yoshizawa at Hamamatsu Photonics
10282012 Katsushi Arisaka UCLA
- Vacuum based Photon Detectors
- Outline
- Concept of PMT
- PMT (Photomultiplier Tube)
- Super-Kamiokande
- Slide 6
- Operation of Head-On Type PMT
- Structure of Linear-focus PMT
- Principle of Silicon Photodiode
- FAQ
- Purpose of Photon Detector
- Basic Properties
- Outline (2)
- Quantum Efficiency (QE)
- Quantum Efficiency (QE) (2)
- QE curves of 6 types
- Typical QE
- Transmittance of windows
- FAQ (2)
- FAQ (3)
- Slide 21
- Slide 22
- Propagation Chain of Absolute Calibration of Photon Detectors
- NIST High Accuracy Cryogenic Radiometer (HACR)
- Trap Detector
- NIST Standards Quantum efficiencies of typical Si InGaAs and
- Sk (Cathode Sensitivity) and Skb (Cathode Blue Sensitivity)
- Collection Efficiency (CE)
- FAQ (4)
- Detective Quantum Efficiency (DQE)
- FAQ (5)
- Dynode Structure
- PMT Types
- Dynode Structures ndash Side-on vs Head-on
- Dynode Structures ndash Linear Focus vs Venetian Blind
- Metal Channel PMT
- Fine Mesh PMT
- MCP (Micro Channel Plate)
- MCP PMT
- Principle of Image Intensifier
- Effect of Magnetic Fields
- Gain of PMT
- Structure of Linear-focus PMT (2)
- Secondary electron Emission
- Gain (GP)
- FAQ (6)
- Single PE distribution
- Gain (GI)
- FAQ (7)
- Gain vs Voltage Curve
- 270 Auger-SD PMTs HV for G=2105 UCLA vs Photonis
- FAQ (8)
- FAQ (9)
- Gain and Dark Current vs HV
- Temperature Dependence of Anode Sensitivity
- Two Types of Voltage Divider
- Time Response
- Time Response (2)
- Typical TTS (Transit Time Spread)
- Transit Time vs HV
- Time Properties (R11410)
- Time Resolution vs Sensitive Area
- Imperfect Behavior of PMT
- Uncertainties Specific to PMTs
- Linearity
- PMT Non Linearity
- Pulse Linearity
- Slide 68
- Optimization of Anode Pulse Linearity
- Slide 70
- Uniformity
- Anode Uniformity
- Cathode Uniformity (3 inch PMT)
- Anode Uniformity (3 inch PMT)
- Collection Efficiency (=AnodeCathode)
- Effect of Magnetic Field
- Effect of Magnetic Fields (2)
- Typical Magnetic Field Effect
- Effect of Magnetic Field on Liner-focus 2rdquo PMT
- Edge Effect of Magnetic Shields
- Dark Count
- Temperature Dependence of Dark Current
- Dark Count Rate vs Temperature
- After Pulse
- After Pulse (R11410)
- After Pulse by Helium
- Long Term Stability
- Typical Long-term Stability
- Other Vacuum Devices
- Principle of Silicon Photodiode (2)
- APD (Avalanche Photodiode)
- HPD (Hybrid Photodiode)
- CMS Detector under 4 Tesla
- Slide 94
- LHCb experiment
- Slide 96
- Hamamatsu Hybrid APD
- 1 2 3 hellip Photo-electron Distribution
- Decay Time Measurement by HAPD
- Leica HyD Detector for Confocal Microscope
- 8 inch HAPD by Hamamatsu
- Slide 102
- QUPID (QUartz Photon Intensifying Detector)
- Production Version QUPID
- 1 2 and 3 PE Distribution with 2m cable
- Intevac Electron Bombarded CMOS
- EBAPS by Intevac
- Energy Resolution
- Anode Signal (E)
- Energy Resolution (E)
- Excess Noise Factor (ENF)
- Single PE Distribution
- Single PE Distribution (2)
- ENF vs PV Ratio of 270 Auger-SD PMTs
- FAQ (10)
- Resolution of Hybrid Photodiode (HPD)
- Summary Table
- Energy Resolution vs N
- Resolution (over Poisson Limit)
- Summary
- Purpose of Photon Detector (2)
- Market Price
- FAQrsquos
- More FAQrsquos
- Closing Remarks
- References
-