Feb 9, 2011 SiPM Electrical and Cooling

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Action Items from previous meetings

  1. Populate interface cards to the ADC (Chris)
  2. Complete 3 remaining boards for SiPM testing (Chris)
  3. Determine if swapped bias pins was accidental or in design (Chris)
  4. Make a second SiPM extraction tool for USM (Jim and Scot)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM production testing (everyone)
  5. Mechanical assembly (Scot)
  6. Mechanical (Jim)
  7. Mechanical drawings (Chuck)
  8. Temperature compensation (Jack)
  9. Preamp-summing (Fernando/Chris)
  10. SiPM testing (Ivan)

Minutes

Attending: Jack,, Carl, Scot, Chris, Yi, John, Elton, Jim, Eugene

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM production testing (everyone)
    1. OSP (Carl)
      • OSP submitted. Bert will take the next step
      • Ordered micro-switches to interlock box with power supply
      • Ordered anti-static straps, flash lights
      • Scot: Added grounding wire for the support plate in the box. Discussion on where to attach. Suggestion to use the VME crate ground, but test with/without connection.
    2. Software (YI)
      • Control software is ready
      • Analysis software is advancing to use the JLab farm
    3. Hardware setup (Yi)
      • Need additional low voltage cables
      • Once complete, we will need to establish training for the setup
      • Recheck light uniformity
      • Carl: The light uniformity left-right is within 1%
      • The top two rows are about 4% lower than the middle two
      • Preamp 10 Ohm output resistor has been replaced by a 0.1 microF capacitor to eliminate the DC offset
    4. Test operating temperature
      • Presently operating at 9 deg C
      • Plan: test at one temperature first and then repeat at second temperature to establish temp dependence.
      • Test at lowest temperature possible without condensation. There is concern that 5 deg may be too low.
      • Carl will buy water absorbing material for the box.
  5. Mechanical assembly (Scot)
    • Chemically polished light guides
    • Some samples sizes missing
    • Proceed with gluing tests using best glue to date and one new ne
  6. Mechanical (Jim)
    • Will order humidity sensor
    • Parts for gluing fixture should be in soon
  7. Mechanical drawings (Chuck)
  8. Temperature compensation (Jack)
    • Parameters for thermistor selected and large order submitted plus order for mini-Bcal
  9. Preamp-summing (Fernando/Chris)
    • MPPC compact design boards built up (and more on the way)
    • Boards for PS completed
    • Thermistor boards done
    • U-boards waiting Fernando for final test. Components are in hand. First 80 will be done in house using Jim's fixture.
  10. SiPM testing (Ivan)
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