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Status report of MPPC mass measurement

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.

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Status report of MPPC mass measurement

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  1. 15/20 Status report of MPPC mass measurement • Gain measurement • Noise rate measurement 2007/Feb/21 Shinshu Univ. HE lab. M2 TakashiTsubokawa 1/15 1/12

  2. 2ndstage-measurement setup(2nd-stage MPPCs with FPCB) Gate generator LED Driver Coincidence Clock Generator Thermo-static chamber (kept at 15 oC) LED 470nm Output register ・・・ FPCB 9chMPPC with FPCB and 1chMPPC 16chASD ADC Bias voltage Gain Noise rate Control PC Discri Scaler MPPC FPCB One channel on the board is kept as reference 2/12

  3. 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) Black:2nd-stage Red:1st-stage 3/12

  4. 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

  5. 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 MPPCs 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

  6. The data sheet of breakdown voltage Breakdown voltage Black: 1st-stage Red: 2nd-stage MPPC serial number 6/12

  7. The variation of breakdown voltage • 1st-stage (black) • 2nd-stage(red) • The breakdown voltage of 2nd-stage is lower than that of 1st-stage. Number of samples Breakdown voltage (V) 7/12

  8. 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. Number of samples Pixel capacitance (pF) 8/12

  9. MPPC gain vs Over-voltage • Gain of 1st-stage（black） and 2nd-stage（red） is about the same with Over-voltage. ×105 Gain LargeChisquare Over voltage (Vbias- V0) 9/12

  10. Noise rate vs Over-voltage ×103 Noise rate(>0.5p.e.thr) 1st-stage Noise rate(>0.5p.e.thr) 2nd-stage Noise rate(Hz) Over voltage (Vbias-V0) Over voltage (Vbias-V0) The noise rate of 2nd-stage is about 2 times bigger than that of 1st-stage (with Over-voltage). 10/12

  11. Crosstalk vs Over-voltage Crosstalkprobability 2nd-stage Crosstalkprobability 1st-stage Cross-talk probability Cross-talk probability Over voltage (Vbias-V0) Over voltage (Vbias-V0) The crosstalk of 2nd-stage is about with that of 1st-stage (with Over-voltage). 11/12

  12. 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

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