Feb 23, 2011 SiPM Electrical and Cooling

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Action Items from previous meetings

  1. Determine if swapped bias pins was accidental or in design (Chris)
  2. Make low voltage cables for the SiPM test (Chris)
  3. Acquire material to absorb water for the box (Carl)
  4. Order dew point sensor (Jim)

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 (Chris is out but sent these notes)

Minutes

Attending: Jack, Elton, John, Yi, Nick, Jim, Chuck

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM production testing (everyone)
    • All electronic boards installed
    • Re-calibrating optical flux and filter settings
    • Carl will provide 16 first-article samples to Yi for a comparison with previous measurements, systematics of new setup and uniformity of light illumination.
    • Yi will create a "how to" for use with the test setup
  5. Mechanical assembly (Scot)
    • Light guide gluing fixture has been modified to account for thicker plate on mini-Bcal
  6. Mechanical (Jim)
  7. Mechanical drawings (Chuck)
    • Chuck has been developing the drawings for brackets to modify the Regina support for mini-Bcal to allow positioning the device transverse to the beam.
  8. Temperature compensation (Jack)
    • Has compiled a data sheet with test voltage settings and resistor patters for first 1000 production SiPM units. Will update tables to set SiPMs to Vbr+1.2 V (Hamamatsu operating voltage + 0.3V)
    • The new settings can be used during assembly of the readout electronics.
    • Yi will compile a list of 160 SiPMs as possible units for the beam test and 4x2 bins of voltage. (We need only 80)
  9. Preamp-summing (Chris is out but sent these notes)
    • The 80 U Boards will be delivered tomorrow and I have all the parts in house
    • I have finished and tested the last 4-Up BCAL test boards and installed it in the test fixture in 126
    • I installed the additional 3 power cables to power the boards
    • I built up 8 more of the Samtec to CAEN adapter boards and asked Jim F. to bring them to the meeting today. I am waiting on parts to finish the last 4.
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