Sep 22, 2011 SiPM Electrical and Cooling

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Action Items from previous meetings

  1. Carl to check instability of LED (as a possible contributor to sensor output changes) (Carl)
  2. Bias/temperature compensation review: Tentatively set for Oct 13 because Fernando will be out of the country till October and October 6 is the collaboration meeting.
  3. Fernando to provide dxf file to Jim, who has had trouble reading his stp files.

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM testing (everyone)
    1. Light source / optics
    2. Electronic boards
    3. Cabling
    4. Cooling plate
    5. Other?
  5. Mechanical (Jim)
  6. Mechanical drawings (Chuck)
  7. Geometry (Elton)
  8. Temperature compensation (Jack)
  9. Preamp-summing (Fernando)
  10. Granularity (Elton)

Minutes

Attending: Jack, Chris, Chuck, Jim, Ivan, Elton, Carl, Yi

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM testing
    • Two samples have been tested, one from the beginning of the run and one from the end. They also have different operating voltages. No differences compared to first article
    • Jack and Carl will review Hamamatsu data sheets, pick out another couple of samples to check against specs.
    1. Light source / optics
      • all components in hand and moving to EEL 126
    2. Electronic boards
      • Connector boards for cabling done, but need iteration due to flipped connector
      • Question about grounding of 4 preamp boards. Jack suggested to use a common ground. Chris will go forward with this.
    3. Cabling
      • Cables are in
    4. Cooling plate
      • Iteration with Chris on the location of through holes, which has been resolved. Cooling plate will go to shop tomorrow.
    5. Other?
  5. Mechanical (Jim)
    • Location of holes in plate have been iterated with Chris and drawings can now be made.
  6. Mechanical drawings (Chuck)
    • Many drawings complete. Remaining drawings have been waiting final details but can now proceed.
  7. Geometry (Elton)
  8. Temperature compensation (Jack)
    • Reviewing components. In particular the connector for the thermistor has not finalized. Discussion brought up the possibility of adding a thin PC board and a coax cable. This option will be checked further.
    • Need to check HV rating of coax cable. Needs to hold at least 80 V.
    • Jack has found that special runs for thermistor with better tolerance can be made at nominal cost. This will be useful.
  9. Preamp-summing (Fernando)
  10. Granularity (Elton)
  11. SiPM timing tests (Ivan)
    • All equipment is in place, except for the generator, which is expected by mid Oct.
    • Will start working on the DAQ next week
    • When generator arrives, he will start testing timing using 2 LEDs.
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