Status report of MPPC mass measurement

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       Status report of MPPC mass measurement



      • ADC measurement
      •Threshold curve measurement



                                             2007/Jan/30
                                           Shinshu Univ.
                                             HE lab. M2
1
1/4                                  Takashi Tsubokawa
          Measurement setup
  Clock Generator       Coincidence     LED Driver                        Gate generator


                                              LED   Thermo-static chamber
                                              470nm    (kept at 15 oC)
              Output register
                                       MPPC
                                        ・・・
                     Bias                                16chASD             ADC
                                      10chMPPC
                    voltage             board                                Gain

 Control PC                                                     Discri         Scaler


                                                                          Noise rate
      FPCB                                       MPPC


                                               One channel on the board
2/4                                            is kept as reference
                                                                    19/20




      Measurement time (data taking)
         Gain measurement
             Change MPPCs                    ,,,,,,,,,,,,,,,,,,,,,,,,2min
             Stabilize temperature           ,,,,,,,,,,,,,,,,,,,,,,,,5min
             ADC data taking                 ,,,,,,,,,,,,,,,,,,,,,,,,3min
                             Sum:10min /      9MPPC(1 FPCB sheet)
         Noise rate measurement
             Change MPPCs                 ,,,,,,,,,,,,,,,,,,,,,,,,2min
             Stabilize temperature        ,,,,,,,,,,,,,,,,,,,,,,,,5min
             Discriminator curve data taking ,,,,,,,,,,,,,,,,,,,,9min
                             Sum:16min / 9MPPC(1 FPCB sheet)

                    All:26min / 9MPPC(1 FPCB sheet)
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      Progress
         Re-measurement have been finished
         600 MPPCs have been delivered
          on Feb-8 2007
             351 MPPCs with FPCB
             249 plastic-package MPPCs
         351 MPPCs with FPCB have been measured.
         Analysis of re-measurement and 351 MPPCs
          measurement is on going.
              Analysis will be done as soon as possible
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