Upload
ailsa
View
40
Download
1
Tags:
Embed Size (px)
DESCRIPTION
15/20. Status report of MPPC mass measurement. Gain measurement Noise rate measurement. 2007/Feb/21 Shinshu Univ. HE lab. M2 Takashi Tsubokawa. 1/15. 1/12. 2ndstage-measurement setup (2 nd -stage MPPCs with FPCB ). Gate generator. LED Driver. Coincidence. Clock Generator. - PowerPoint PPT Presentation
Citation preview
Status report of MPPC mass measurement
15/20
2007/Feb/21
Shinshu Univ.
HE lab. M2
Takashi Tsubokawa1/15
1/12
•Gain measurement•Noise rate measurement
FPCB
Gain
Noise rate
ADC
Thermo-static chamber (kept at 15 oC)
Clock Generator Gate generator
16chASD
Discri Scaler
Output register
9chMPPC with FPCB and
1chMPPC
Bias voltage
LED
LED Driver
470nm
MPPC
Coincidence
2ndstage-measurement setup(2nd-stage MPPCs with FPCB)
Control PC
One channel on the board is kept as reference
FPCB
・・・
2/12
19/20
Measurement time (data taking)
Gain measurement Change MPPCs ,,,,,,,,,,,,,,,,,,,,,,,,2min(5min) Stabilize temperature ,,,,,,,,,,,,,,,,,,,,,,,,5min(5min) ADC data taking ,,,,,,,,,,,,,,,,,,,,,,,,3min(3min)
Sum:10min / 9MPPC(1 FPCB sheet) Sum:13min / 14MPPC
Noise rate measurement Change MPPCs ,,,,,,,,,,,,,,,,,,,,,,,,2min(5min) Stabilize temperature ,,,,,,,,,,,,,,,,,,,,,,,,5min(5min) Discriminator curve data
taking ,,,,,,,,,,,,,,,,,,,,9min(17min) Sum:16min / 9MPPC(1 FPCB sheet)
Sum:27min / 14MPPC All:26min / 9MPPC(1 FPCB sheet) (All:40min / 14MPPC)
3/12
Black:2nd-stageRed:1st-stage
Progress 1ststage-measurement have been
finished 600 MPPCs have been delivered
on Feb-8 2007 351 MPPCs with FPCB 249 bare chip MPPCs (without FPCB)
351 MPPCs with FPCB (39 FPCBs) have been measured.
Analysis of 351 MPPCs measurement has been finished.
4/12
Deference 1st-stage MPPCs and 2nd-stage MPPCs (HPK data)
Delivered 1st---------end of Dec(400MPPCs) 2nd--------start of Feb(600MPPCs,351 MPPCs with FPCB,259 MPPC
s without FPCB) Mean operation voltage (Gain =2.75x105 )
1st---------76.43V 2nd--------76.03V
Typical Noise rate at operation voltage 1st---------0.5p.e.thr 150~160k,1.5p.e.thr 0.5~2k 2nd--------0.5p.e.thr 300~350k,1.5p.e.thr 2~3k→increase the noise rate
5/12
The data sheet of breakdown voltage
6/12MPPC serial number
Bre
akd
ow
n
volt
ag
e
Black:1st-stage
Red:2nd-stage
The variation of breakdown voltage
1st-stage (black) 2nd-stage(red)
The breakdown voltage of 2nd-stage is lower than that of 1st-stage.
Num
ber
of
sam
ple
s
Breakdown voltage (V)
7/12
The variation of pixel capacitance
1st-stage (black) 2nd-stage(red)
The pixel capacitance of 2nd-stage are about same with that of 1st-stage.
Pixel capacitance (pF)
Num
ber
of
sam
ple
s
8/12
MPPC gain vs Over-voltage Gain of 1st-
stage ( black ) and 2nd-stage ( red ) is about the same with Over-voltage.
Over voltage (Vbias- V0)
×105
Gai
n
9/12
Large Chisquare
Noise rate vs Over-voltage
Over voltage (Vbias-V0) Over voltage (Vbias-V0)
Noi
se r
ate
(Hz)
The noise rate of 2nd-stage is about 2 times bigger than that of 1st-stage (with Over-voltage).
×103
Noise rate(>0.5p.e.thr)1st-stage
Noise rate(>0.5p.e.thr)2nd-stage
10/12
Crosstalk vs Over-voltage
Over voltage (Vbias-V0)Over voltage (Vbias-V0)
Cro
ss-t
alk
prob
abili
ty
Crosstalk probability1st-stage
Cro
ss-t
alk
prob
abili
ty
The crosstalk of 2nd-stage is about with that of 1st-stage (with Over-voltage).11/12
Crosstalk probability2nd-stage
Summary The measurement of 2nd-stage MPPCs with FPCB has
been finished.
Gain of 2nd-stage ( red ) is about the same with that of 1st-stage ( black ) .
The noise rate of 2nd-stage is 2 times bigger than that of 1st-stage .
The crosstalk of 2nd-stage is about with that of 1st-stage. (with Over-voltage)
12/12