Aug 9, 2011 SiPM Electrical and Cooling

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Action Items from previous meetings

  1. Develop front and back views of jumper sheets. (Jack)
    • This specifically includes the settings for the pre-production boards that are needed by Wed of next week.
  2. Test wrapping forms (Elton)
  3. Order glue (and any other consumables) to glue light guides (Scot)
  4. Check new gluing jig for the light guides (Scot and Jim)

Tentative Agenda

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
  4. SiPM production testing (everyone)
    • SiPMs assignment for new boards
  5. Mechanical assembly (Jim)
  6. Temperature compensation (Jack)
  7. Electronic boards (Chris)
  8. Light guide gluing setup (Scot via e-mail)
    • I have completed the redesigned light guide "push" vacuum wand / base fabrication as of 1:30 p.m. today.
    • I ordered a 1 LB. bottle of Norland NOA 87 light guide UV adhesive on 08/17/2012 - PR # 321682

Minutes

Attending: Jack, Elton, Jim, Eugene, Fernando, Ivan, Chris, Yi

  1. Announcements
  2. Action Items
  3. Schedule, reporting, and manpower (Elton)
    • Yesterday we received the second shipment of 600 SiPMs from USM. They sailed through customs
  4. SiPM production testing (everyone)
    • SiPMs assignment for new boards
    • Shaun Krueger (student from UofR) has made a list of 80 SiPMs to be fitted to the pre-production boards
    • Shaun has also compiled an assignment list of SiPMs to electronic boards for all 4000 sensors.
    • Shaun's approach is to group SiPMs according to Vop.
    • Replaced one R2 resistor with a fixed ~6KOhm resistor to compensate for low precision resistor value. Result is a 3 resistor trim, but covers the range needed
    • Pre-production boards will be different from the production boards to avoid changing many resistors. Only one resistor per SiPM needs to be changed on the pre-production board.
    • Final production units will have fixed values for the trim resistors, but different from the ones on the pre-production modules.
  5. Mechanical assembly (Jim)
    • Glued thermistor boards to cooling plate
    • Redesigned the clamping fixture
    • Mechanical drawings are being checked; no subassemblies yet
    • Mechanical hardware for pre-production boards all in house
  6. Temperature compensation (Jack)
    • Generated jumper sheets for pre-production boards
    • SiPMs have been selected and given to Chris for the pre-production boards
  7. Electronic boards (Chris)
    • All thermistor and U boards are in
    • Cables are in
    • BCal LED monitoring board micro-Dsub connection done
    • Thermal Mats cut
    • Lemo board HFL interconnect board will arrive next week
    • HFL cables (production) will be ordered as soon as the pre-production assembly is checked
  8. Electronic boards (Fernando)
    • Need to find a good way of storing the SiPMs in preparation for installation
    • Detailed testing of pre-production boards is underway. Grounding copper lines on the pre-production boards was increased from 1oz and 0.5 oz to 2 oz and 1 oz, respectively
    • Balancing the requirement of reduced gain and ringing on the board is underway. The evaluation of the limits of the design will be completed by tomorrow.
    • Requests that we re-evaluate the requirement of reducing the gain by 2.5.
  9. Light guide gluing setup (Scot via e-mail)
    • I have completed the redesigned light guide "push" vacuum wand / base fabrication as of 1:30 p.m. today.
    • I ordered a 1 LB. bottle of Norland NOA 87 light guide UV adhesive on 08/17/2012 - PR # 321682
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