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ILC CAL
SiPM test status
Kobe-U
Yuki Tamura(M2)
Eri Sano(B4)
ILC CAL
SiPM Test Status
・We take Noise rate , Absolute Gain of MPPC 100pix・400pix Russian 1156pix
・We take Linearity of MPPC 100pix and from gradient in this graph efficiency
of MPPC 100pix is about 6～7％
Linearity of MPPC 100pix
number of event
! MPPC has 2 type { high ・ low } gain from lower right histogram
Two Gain pattern in MPPC in 100pix
(taken by Nobuhara in Kyoto-U)
pedestal
MPPC 100pix at LED
1p.e.?
adc count
ILC CAL
2Gain Problem
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About 100pix
・small gain pixel has 10% gain of normal pixel
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・gain is so small → We can observe in high bias
ILC CAL
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About 400pix
・large gain variation at low bias
・We can separate 2Gain at 49.5V
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・20% of normal gain at 50.5V
ILC CAL
R1156
@64.0V
R1156
@66.0V
About 1156pix
・In these bias small gain pixel has always 50%
of normal pixel
R1156
@67.0V
ILC CAL
Noise Rate
・We measured at {minimum(20mV),0.5p.e.,1.5p.e.} threshold
・We count Noise in 10seconds
Noise
ILC CAL
About 1156pix
・not considering breakdown voltage , low noise in low temperature
●M20℃
●M10℃
● 00℃
● 10℃
● 20℃
ILC CAL
About 400pix
・Less difference between 5 temperature than 1156pix
●M20℃
●M10℃
● 00℃
● 10℃
● 20℃
ILC CAL
About 100pix
・high Noise in low temperature? → We must consider about breakdown voltag
●M20℃
●M10℃
● 00℃
● 10℃
● 20℃
ILC CAL
Break Down Voltage About 100pix
・Get Vb from CMPPC(V-Vb)
・We can guess CMPPC = 3MF
M20C
M10C
00C
10C
20C
–
–
–
–
–
40.9V
41.1V
42.1V
42.3V
42.9V
Absolute Gain in Hamamatu 100pix MPPC
ILC CAL
Noise Rate with Breakdown Voltage About 100pix
・We can observe lower noise in lower temperature
●M20℃
●M10℃
● 00℃
● 10℃
● 20℃
Noise Rate in Hamamatu 100pix considering Breakdown Voltage
ILC CAL
Linearity and Efficiency
・because of random position in each package and guard acrylic,
light from fiber extends
→ cannot expose same light amount to PMT and MPPC with fiber
・Now Considering jig of PMT
Change PMT
Diffuser
We try next challenge in this setup→
ILC CAL
To Do
・make jigu and measure linearity and efficiency
・Get signal with source