22/09/20041 pm and shoebox tests hamamatsu 19 and 16 dynodes compared to feu 187 15 dynodes ...
TRANSCRIPT
22/09/2004 1
PM and shoebox tests
Hamamatsu 19 and 16 dynodes compared to
FEU 187 15 dynodes Jyväskylä’s shoebox (T0)
V0A
V0C
22/09/2004 2
Electronics for MIP measurements
FA
V0 counter
op
tical fi
bers
TDC1
PM
HT 30 ns
gate
QDC
THR1
5 m
anode
FI/FO
FI/FOTHR2
THR3
THR4
TDC2
TDC3
TDC4
start
25 m
25 m
17 p.e./MIPthr4
thr3
thr2
thr1
pedqdc
peddisc
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FEU
18
7 g
ain 18 14
21
20
19
15
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Hamamatsu and FEU 187 gain
19 dynodes
16 dynodes
15 dynodes
Hamamatsu
FEU 187
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Hamamatsu / FEU 187
17
16
15
MIP measurement at equal gain• 17 p.e. for the most probable charge• 12 pC / 60 mV • charge = MIP / 4 for Hamamatsu PMT• charge = MIP / 2 for Russian PMT• time (Ham.) = 1.5 time (FEU 187)• a threshold at 2 charge (98%) - MIP / 2 mV for Hamamatsu (30 mV) - 0 for FEU 187 Hamamatsu will be selected for V0
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time versus discriminator threshold
17 p.e.
2 > 0 mV
2 > 30 mVdynamics: 3 mV-3 V
MIP amplitude > 60 mVHam.
FEU 187
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MIP versus discriminator threshold
17 p.e.
Maximum efficiency
2 MIP efficiency
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H6153-70 = R5946 + HV divider (+)
PMT and divider in in a common cylinder• makes the mounting easy• simplifies the mechanics•
22/09/2004 9
Electronics for tests with the schoebox
A10/A25
V0 counter
op
tical fi
bers
TDC1
PM
HT 30 ns
gate
QDC
THR1
5 m
anode
FI/FOTHR2
THR3
THR4
TDC2
TDC3
TDC4
start
25 m
25 m
17 p.e./MIPthr4
thr3
thr2
thr1
pedqdc
peddisc
shoeboxA1
CFD
TDC4
thr
22/09/2004 10
Measurement with the shoebox
16 dynodes Hamamatsu tube• Charge distributions as a function of - high voltage: 1400, 1600, 1750, 1800, 2000, 2200 - amplification factor: 1, 10, 25• Time resolution with amplification 10 and threshold / constant
fraction discriminators as a function of - high voltage: 1400, 1600, 1800, 2000, 2200 Extraction of the time resolution values still to be carried out
22/09/2004 11
Charge distributions at 1400 V from 16 dynodes Hamamatsu PMT
Without shoebox
HT= 1400 V, A=1
HT= 1400 V, A=25HT= 1400 V, A=10
HT= 1400 V, A=1
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T0 schoebox as described in TDR
PM Anodesignal
100 ohms
50 ohms
50 ohms
G=3.2
G=3.2
To TRDwake-up
To T0 FEEthreshold disri.
and QDC
To T0 FEECFD
G=3.2
22/09/2004 13
V0 pulse treatment
shaperNINO
(0.1 – 2 pC) 2 ns
ORPM Anode
signal
100 ohms
50 ohms
50 ohms
G=3.2
G=3.2
Signal amplitude3 mV – 3 V
(5 mV – 5 V)
Signal amplitude3 mV – 3 V
(5 mV – 5 V)
Signal amplitude9.5 mV – 300 mV
(16 mV – 300 mV)
Signal amplitude30 mV – 1. V
(50 mV – 1. V)
To TRDwake-up
To V0 FEEthreshold disri.
To V0 FEEQDC
G=3.2
G=1
Signal charge0.6 pC - 600 pC(1 pC - 1000 pC)
Signal charge6 pC - >200 pC
(10 pC - >200 pC)
Signal charge6 pC - >200 pC
(10 pC - >200 pC)
22/09/2004 14
15/10/2004
CIU PCB prototype
22/09/2004 15
16/11/2004
Tests in progress
22/09/2004 16
Conclusion
Choice of the Hamamatsu PMT 16 dynodes• gain = 3 106 at 2000 V (FEU = 3 105)• charge resolution = MIP/4 (FEU = MIP/2)• time resolution (MIP = 17 p.e.) < 1 ns at 1750 V (FEU #
1.4 ns) Choice of the T0 shoebox with an amplification of 10• direct signal to QDC • amplified (clamped) signal to discriminator
22/09/2004 17
Quota
tion f
rom
Ham
am
ats
u
France
22/09/2004 18
V0 cost for 64 channels (R5946-70)label unit spare unit price total price
H6153-70 (R5946-70) 64 6 1500 105000
HV SY2527/A1733P 1/6 - 8812/2929 26386
VME 1 - 6000 6000
Electronics 64 2 70000
Mechanics PM + boxes 2 - 1000 2000
Scint. V0A/V0C (m2) 2 x .6 - 1500 1500
WLS F. V0A/V0C (m) 2 x 346 - 3.3 2284
Clear F. V0A/V0C (m) 2 x 3456 - 1.0 6912
Total in € 220082
Total in SF 330123
HV cab. V0A/V0C (m) 270 - 5.8 1566
HV con. V0A/V0C (448) - 4756
Sig. cab. V0A/V0C (m) 2 x 1600 - 2.0 6400
Sig. con. V0A/V0C (2 x 576) - 11136
Total in SF 353981
22/09/2004 19
Present programme Order of:• VME crate: 15/12/2004• 70 systems H6153-70 (PM5946-70 + HT divider): 15/12/2004 - delivery: 10 (06/2005), 20 (07/2005), 20 (08/2005), 20 (09/2005)• scintillator BC404: 15/12/2004• shifting fibers: 15/12/2004• optical fibers: 15/12/2004 Sector ’’0’’:• available: 03/2005• tested: 04/2005• design review: 04/2005 Sectors ’’1’’ - ’’7’’ + V0C box + V0C fiber cables• available: 11/2005• tested: 12/2005 PM characterisation:• gain curves: 12/2005 V0C ready end of 2005 V0A ready in June 2006 Electronics R&D: follows the time-table (TDR)• CIU prototype tested: end 2004
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Hamamatsu mesh PMT performances (I)
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Spectral response
Hamamatsu
Hamamatsu / FEU 187
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Hamamatsu mesh PMT performances (II)
22/09/2004 23
Hamamatsu mesh PMT performances (III)
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Recommendation for the HV sign
1) The R5505-70 and the R5946-70 are for +HV operation.>> We usually recommend +HV operation for all of the Fine Mesh PMTs. The> reason is as follows:>> Basically, there is no difference in PMT itself between -HV model and> +HV model. When a fine mesh PMT is operated at -HV, it sometimes> generates large noises. This is due to discharge between electrodes> (former stages of dynodes), the bulb and supporting materials outside.> Fine mesh PMT has proximity configuration, the electrodes are set> close to the window and the bulb. When -HV is used, potential of these> electrodes become -HV. There could be large potential difference> somewhere around window. In case of +HV operation, as cathode is> grounded, there is less potential difference between electrodes, the> bulb and supporting materials. Therefore noise becomes less. We would> like to recommend +HV operation for all customers.
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1. Here is the anode dark current stability data of the R5946 (1.5« Fine Mesh PMT). The horizontal axis is operating time and the vertical axis is the anode dark current recorded by ampere meter and recorder (10 mV = 100 nA). The upper data was measured at -HV operation and the lower one was measured at +HV operation. The PMT was supported by its socket, and there was nothing around the PMT bulbs. Spike noises appeared at -HV operation. However, when it was used at +HV operation, the noise became less.
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Waveform of the pulse
2. We checked the waveform of the R5505(1 inch Fine Mesh PMT) and the following is its data. Blue curve is at -HV operation and pink one is at +HV operation. Although the overshoot was rather seen at +HV, it's not so much.
Therefore, we would like to recommend +HV operation.
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Ham
am
ats
u /
FEU
18
7
com
pari
son
17
16
15 28
29
27
60 m
V pul
se