performance of sipm ryuhei nakamura (kobe univ.) glc calorimeter group (kek, kobe, konan, niigata,...
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Performance of SiPM
Ryuhei Nakamura (Kobe Univ.)GLC calorimeter group
(KEK, Kobe, Konan, Niigata, Shinshu, Tsukuba)
Contents ・ Introduction ・ Test results ・ Summary ・ To do
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・ Particle Flow Algorithm Fine segmentation Large number of channels
Introduction
Particle
Direct attachment to Scinti. or WLS
・ Less expensive example is Scintillator (+WLS) & SiPM readout
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SiPM (provided by JINR group)
・ Micro-APD cells operated in Geiger-mode ・ ~1000 pixels (~1mm × 1mm) ・ High Gain (~106) ・ Operational at low voltage (~65V)
8mm
2mm
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Set up (for Gain mesurement)
Fast Amp : ORTEC FTA820 (Gain 200)ADC : Phillips 7166
SiPM
P.G.LED
Bias
G.G.
FastAmpCAMACADC
Thermostatic ChamberGate width : 35nsec
LED Pulse width : 10nsec height : 5.5V
50Ω
100k
Ω
100 n F
100 n F
Bias64.0V~67.5V
SiPM
Output
Readout Circuit
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Ped
1p.e.
2p.e.
3p.e.
4p.e.
2.00ns/div100mV/div
1p.e.
2p.e.
Ped Photon Counting
at Room Temperature
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Gain・ Gain vs Bias voltage ( 6 SiPMs checked )
#Serial Number ① ――― ② ――― ③ ――― ④ ――― ⑤ ――― ⑥ ―――
as
This #Serial SiPM④ is used for the mesurement of Temp. dependence. (Next page)
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Temperature dependence( for 1 SiPM )
67.5V ―――
67.0V ―――
66.5V ―――
66.0V ―――
65.5V ―――
65.0V ―――
64.5V ―――
64.0V ―――
20℃ ―――
10℃ ―――
0℃ ―――
‐10℃ ―――
‐20℃ ―――
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Thermal Noise・ SiPM has a MHz order thermal noise. ---Some pixels discharge at random. -Set up
200ns/div100mV/div
SiPM
Bias
FastAmp
Discriminater Scalar
Thermostatic Chamber
1pixel
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Thermal Noise vs Bias Voltage ( 6 SiPM checked )
This #Serial SiPM④ is used for the measurement of Temp. dependence. (Next page)(Same one was used in Gain vs Temp. mesurement)
#Serial Number ① ――― ② ――― ③ ――― ④ ――― ⑤ ――― ⑥ ―――
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Temperature dependence ( for 1 SiPM )
67.5V ―――
67.0V ―――
66.5V ―――
66.0V ―――
65.5V ―――
65.0V ―――
64.5V ―――
64.0V ―――
℃24 ―――
10℃ ―――
0℃ ―――
‐10℃ ―――
‐20℃ ―――
It was measured one day after (at room temperature)
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Linearity・ SiPM signal is saturated when two or more photons go into one pixel.
SiPM
P.G. LED
Bias
G.G.
PMT
CAMACADC
GATE width : 100nsec
LED Pulse width : 15nsec height : 4.0V to 8.0V
WLS fiber
NHIT = Npixels(1 - e - <Np.e.>/ Npixels)
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Summary
・ We made a first measurements of Russian SiPMs (The result is very very preliminary)・ Photo electron peak is observed ・ The gain of SiPM is ~106 ・ We measured -- Gain vs Bias V -- Gain vs Temp. -- Thermal Noise vs Bias V -- Thermal Noise vs Temp. -- Linearity ・・・ Saturation is observed
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To do
・ Check reproducibility of the measurements
・ Check long term stability
・ Comparison with other photon sensors (MRS, AMPD, HPK’s…)