Aerogel RICH????????? Geiger mode APD ???????

1
Aerogel RICH?????????Geiger mode APD ???????

• ?????????????????
• ????1?
• ????

??
????????? ????(Gain Noise rate ?????
??????) ??????
2
Aerogel RICH?????
???Belle detector
Aerogel Ring Imaging Cherenkov counter Belle
detector?endcap??? ??????????????? P4GeV/c
p/K????????
e-(8.0GeV/c)
B1.5T
e(3.5GeV/c)

• ??????Aerogel???????????????????
• ??????????????????????????

• AerogelRICH????????
• Geiger mode APD

3
????????????

• Geiger mode APD
• ??
• ?????????
• Gain??
• ?????????
• ??????????
• ???????????
• ????????
• ???????

• ????????????
• ???(1.5T)?????
• 1???????
• ???????????
• 5mm???????

• RICH??
• Geiger mode APD???
• ???????
• ?????????

????????? ????5mm?
Geiger mode APD
Time window???????????
4
RICH??????

• Gain?????????
• Noise rate?????????
• noise rate?1MHz???????1????????
• ? Noise rate???????
• ? ?????
• Time window?????????????????
• TOF?????????????
• ? ???????????????
• ? ???????????????

Noise rate ?1MHz????? Time window?10ns?????100????
1??????????????? PMT??10?????????????
?
???5mm??Geiger mode APD ?????? ????
????????? ? ???????????? ? ????????
5
????Sample

• 2??Geiger mode APD??????????

?????
Sample
6
??????
discri
TDC
Geiger mode APD
clock
div
ADC
funout
discri
AMP
????
Geiger mode APD
ND?????
Black box
Vsource
Sample

• clock 1kHz
• AMPHPK speed amp (C5594) (36dB)
• laser ?636nm
• TDC resolution 25ps
• ADC resolution 0.25pc
• 0.5pe?Threshold

????
ND?????
7
? Gain ??
Vbias71.5V, 23?, noise1.0MHz
Vbias49.5V, 21?, noise1.4MHz
MPPC
MRS-APD
1pes2.0
1pes3.6
2pe
2pe
pedestal

• Gain 1.8106
• S/N 12.4

• Gain 6.6105
• S/N 7.7

GampAMP?Gain
?????????????? Gain???
1??????
8
? MPPC?Noise rate?Gain?????????

• Gainc(Vbias-Vbreak )/e

Gain
MPPC
MPPC
Vbreak -70.3(V) C251 (fF)

• Noise rate1MHz?????-71.5V
• Gain 1.8106
• Over voltage (Vbias-Vbreak )-1.2V

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? MRS-APD?Noise rate?Gain?????????

• Gainc(Vbias-Vbreak )/e

Gain
MRS-APD
MRS-APD
Vbreak -45.5(V) C26.2 (fF)

• Noise rate1MHz??????-48.7V
• Gain5.25105
• Over voltage (Vbias-Vbreak )-3.2V

Noise rate1MHz??1???????Gain????????? ????????????
???????
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?Noise rate ??????1
???????-50?20???noise rate??? Noise
rate?????????????
???
Vsource
Clock
Geiger node APD
AMP
Scaler
Discri
???
PC

• Vbreak?????
• Over voltage (Vbias-Vbreak )??????noise rate???

11
?Noise rate ??????2
MPPC
MRS-APD
Geiger mode APD?????? ???? ????????? ?
???????????? ? ????????
(deg.)

• 0??????2030????
• MRS-APD MPPC
• 300kHz_at_ 0? 200kHz _at_ 0?

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?MPPC??????
Gain??????????? ??????2???????????
636nm
410nm
Sample MPPC Bias -71.5V Threshold 0.5pe Only
Single photon data
s110ps
s103ps

• ?????????s??????
• Time window??????????????

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?MRS-APD??????
636nm
410nm
Sample MRS-APD Bias -49.5V Only Single photon data
s140ps Tail 0.5ns
s70ps ??Tail 4ns

• Time window?????????????????
• TDC???shape?????? ????????????????

14
??????????????
This is plot of SiPM, not MRS-APDreference ICFA
Instrum.Bull.2328-41,2001

• Geiger region??????????
• ???Geiger?????????Timing
• Drift region??????????
• Geiger region?????? ???Timing
• Red laser s70ps Tail 4ns
• Geiger region Drift region?????
• Blue laser s140ps Tail 0.5ns
• ??Drift region?????

MRS-APD?MPPC??? ?????????
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?QEegeom?????????

• ???????? 340nmltllt900nm
• ????? ? ???????
• ??? ? ??Geiger mode APD
• ??????????
• QE???????PD?reference???
• PD?Geiger mode APD????????
• ??QE???

QE ????????????
??????? ????????????

• ??????????????????

Black box
MPPC
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?QEegeom????
??????

• MRS-APD
• Max 45 _at_600nm
• 11 _at_900nm
• MPPC
• Max 51 _at_600nm
• 21 _at_900nm

????????PMT????????

• PDE????????????????
• eGeiger???????????????

????????PDE?? ????????
17
????????????????
p P4GeV/c n1.046 Aerogel??? ??????????
????????? ????5mm?
Geiger mode APD
??0.3rad? ?????????
???1mm???? ????5mm?
???2mm???? ????5mm?
??12mm
??12mm
CE95
CE37
????1mm??????? ????2mm???????????????
18
????????
Geiger mode APD?Gain??????????????QEegeom?????
19
???

• ? Noise rate1MHz ????????1????????Gain????????????
  
• ? 0??????????Noise rate????2030???????
• ? ?????ltltTime window
• ? ????????????????????
• ? ???????????2mm???????????CE?95

??
??????????PDE??

• ???????????

20
Back up
21
???????????

• ??6.2cm????
• 10?????????
• noiserate1MHz
• Gate10ns
• 0.01?/gate

22
??
1pe
23
?????????????????

• MCP-PMT(BURLE?)????????????????????
• MCP-PMT(BURLE?)???????40ps??

410nm
636nm
????????????????? MRS-APD?????????????????
24
Over voitage?????

• Over voltage?????
• PulseHeight????????????
• ???????Vbreak???

25
???

• ???? ESPEC
• ?? PU-3KT(?????K????)

26
????????????

• ???QE????????PMT????????????????QE???
• ?????QE???????????????????????????

27
??????????

• RICH?????????????????
• MRS-APDMax QE(egeom) 452
  _at_600nm
• ?????PMT????1.8??
• ?????????

28
PDE??

• ???????????????

MPPC
Pin hole
V