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“End station A setup” data analysis
Josef Uher
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Outline
Introduction to setup and analysis
Quartz bar start counter
MA and MCP PMT in the prototype
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What was analyzed
quartz bar start counter4 pad MCP - PMT
ADC
ConstantFractionDiscriminator
prototype3x MCP PMT (Burle)
2x MA PMT (Hamamatsu)
light source -pulse laser “Pilas”
LeadingEdgeDiscriminator
TDC
TDC
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Tasks for data analysis software
develop a timing strategies for start counters
develop a calibration procedure for the prototype (determine time offsets for each of all modules, determine single electron timing resolutions)
help to tune the setup and find errors
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What can affect timing resolution?
fluctuation of avalanche recoil of photoelectrons from MCP
surface charge sharing cross talk electronics noise smear of pulse source (laser) ...
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150
170
190
210
230
250
270
290
310
330
350
10 100 1000Frequency [Hz]
Sigm
a [p
s]
The best resolutionMean resolution
Average improvement of the timing resolution
~22%
Timing resolution vs. Pilas trigger frequency
(measured with MA PMT Hamamatsu)
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Quartz bar start counter
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Quartz bar start counter
quartz bar start counter4 pad MCP - PMT
ADC
LeadingEdgeDiscriminator
TDC
Configuration with ADC gives possibility to correct measured time on pulse height off-line.
=> better control than in case of CFD
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ADC correction – how it works?
t1 t2 Time
Am
plitu
de
TDC threshold
TD
C s
pectr
aA
DC
vs.
TD
C
Before correction After correction
1=250 ps 1=100 ps
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Time resolution vs. number of electronsQuartz bar start counter
10
100
1000
0.00 50.00 100.00 150.00 200.00 250.00 300.00
ADC signal [photoelectrons]
Nar
row
er S
igm
a [
ps]
Narrower sigma - new data (100x amplification)
Narrower sigma - old data (10x amplification)
Quartz bar start counter timing resolution
Improvement for single photonsfrom ~350 ps to ~138 ps.
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Prototype
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Burle MCP-PMT, raw TDC spectra
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Hamamatsu MA-PMT, raw TDC spectra
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MCP and MA PMT timing resolution
SLOT 3 Best resolution Average
resolution
[ps] 194.25 250.5
MA PMT Hamamatsu
SLOT 4 Best resolution Average
resolution
[ps] 156.5 258.75
MCP PMT Burle
(raw data only, single photon mode, no corrections)
±58
±43
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Pad timing offset mapsM
A P
MT H
am
am
ats
uWithout TDC link offset
MC
P P
MT B
url
eTDC 1 TDC 2 TDC 3 TDC 4Start
Peak p
osit
ion
Peak p
osit
ion
Peak p
osit
ion
Peak p
osit
ion
Delay ~1ns
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Cross talk
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Cross talk treatment
Possible sources of “false pulses”: charge sharing recoiled electrons internal PMT cross talk (wiring) cross talk in amplifiers cross talk in CFD photons bouncing in prototype box
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Cross talk can appear in any pad of MCP or MA PMT
Cut in certain time after the first pulse
Cross talk treatmentM
CP
or
MA
PM
T
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Cross talk treatment
Time [cnt]
Even
ts
[-]
Example of cross talk treatment with time window 15 counts.
MC
P P
MT B
url
e
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Cross talk treatment
Time [cnt]
Even
ts
[-]
Example of cross talk treatment with time window 15 counts.
MC
P P
MT B
url
e
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Cross talk treatment
The time window changed from 15 to 27 counts
Time [cnt]
Even
ts
[-]
Example of cross talk treatment with time window 27 counts.
MC
P P
MT B
url
e
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Time window 15 cnt
Time window 27 cnt
Cross talk only
Cross talk treatment
Time [cnt]
Even
ts
[-]
Cross talk spectra with time window 15 and 27 counts.
MC
P P
MT B
url
e
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Time window 15 cnt
Time window 27 cnt
Cross talk treatment
Time [cnt]
Even
ts
[-]
Corrected TDC spectra with time window 15 and 27 counts.
MC
P P
MT B
url
e
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Timing resolution as a function of cross talk time window
180
190
200
210
220
230
240
250
260
270
0 10 20 30 40
Cross talk window [cnt]
Sig
ma
[ps]
TDC peak height as a function of cross talk time window
2000
2500
3000
3500
4000
4500
5000
5500
6000
6500
7000
0 10 20 30 40
Cross talk window [cnt]
Pea
k h
eig
ht
[-]
Cross talk treatment
Raw TDC spectrum Time window 1 Time window 31
Time [cnt]
Even
ts
[-]
narrow = 190 ps
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MCP PMT Burle after cross talk correction
SLOT 4 Best resolution Average
resolution
[ps] 135.12 225.00 improvement 14% 13%
Multiple hits Cross talk “frequency”
Raw data max.: ~7Corrected data: ~5
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Conclusion
Influence of Pilas laser on timing resolution discovered. Higher Pilas trigger frequency needed – another Pilas laser will be tested.
Repeated measurement of quartz bar start counter timing resolution – still needs more work
All slots in the prototype will be tested in near future
Effective cross talk treatment was implemented in data analysis code