Oct 18, 2011 SiPM Electrical and Cooling

Action Items from previous meetings

1. Decide on cable connections for monitoring cable from Bcal wedge to patch panel. Consider electronics needed for pulsing system (Elton and Fernando)
2. Work with Shaun to write up a procedure for substituting a sensor on one of the boards to be assembled. (Jack)
3. Provide feedback to Fernando on his readout assembly schedule (Elton and Jim)
4. Check uniformity of LED source in black testing box
5. Make a metal die to punch holes in cooling mat to ease assembly. (Nick and Jim) In progress
6. Send P6 line numbers (and accounts) to Jim for purchase of the mechanical parts (Elton).

Tentative Agenda

1. Announcements
2. Action Items
3. Schedule for production and testing (all)
   • Schedule for production (Fernando and Jim)
   • Schedule for SiPM assignment and jumper sheets
4. mini-Bcal (Elton)
5. SiPM production testing (Yi)
6. Mechanical assembly (Jim)
7. Temperature compensation (Jack)
8. Electronic boards (Fernando and Chris)
   • U-board puller?
9. Light guide gluing setup (Scot)

Minutes

Attending: Elton, Jack, Chris, Nick, Jim, Ivan, Yi

1. Announcements
2. Action Items
3. Schedule for production and testing (all)
   1. Schedule for electronics (Chris)
      • Boards are in fabrication. Parts are ordered. PR for assembly has been awarded. Chris will send around the best estimate for arrival of boards (~mid Nov)
      • Two first article boards will arrive first and need to be tested.
   2. Schedule for SiPM assignment and jumper sheets (Jack)
      • Assignment and jumper settings for first article boards to be completed by next week.
      • The production jumper sheets will be completed during the first full week of November.
      • Include SiPMs on mini-Bcal into assignment groupings. Eliminate two scratched units.
   3. Schedule for mechanical parts (Jim)
      • All drawings have been signed off
      • Two PRs should be completed next week (one for laser/water jet cuts and one for mill pieces). Credit card order will be placed for the steel die
4. mini-Bcal (Elton)
   • Testing of optical cross talk and stability continues in the ESB
5. SiPM production testing (Yi and Ivan)
   • Completed 80 SiPM sensors off the mini-Bcal. Units 286 and 1087 from the mini-Bcal were found to have scratches. Tomorrow will retest three units from the downstream row. Next, will test six "untested" SiPMs that were shipped from USM
6. Dehumidification of test box
   • A/C unit has been ordered
   • Plan for duct work is ready and parts are off the shelf, which can be purchased when unit arrives.
7. Mechanical assembly (Jim)
8. Temperature compensation (Jack)
   • Assignment and jumpers for first two boards will be done next week.
   • Assignment of all remaining boards will be completed after the IEEE conference, first full week of Nov.
9. Electronic boards (Fernando and Chris)
   • U-board SiPM puller? Jim will work on an idea.
10. Light guide gluing setup (Scot)Attending: