Nov 1, 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. Check uniformity of LED source in black testing box
3. Make a metal die to punch holes in cooling mat to ease assembly. (Nick and Jim)
4. Produce jumper settings for first article boards next week (Jack)
5. Give Jim a U-board with defective SiPM for devising extraction tool (Nick and Yi)

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

1. Announcements
2. Action Items
   1. Cabling connections for Bcal monitoring to distribution boxes (discussion)
      • Fernando had talked to Chris about this and will continue next week
      • The micro-Dsub connector is on the Bcal module and will have a normal Dsub connector on the distribution box. Each distribution box feeds one quadrant (i..e. there are four distribution boxes upstream and four downstream).
      • Elton mentioned that the bias and +5V would come from the same modules that are used for the SiPMs and cables should be similar. We need to define granularity. The trigger signals will come from a pulser, but the electronics is not yet firmed up. We need to define multiplicity, i.e. how many (independent) trigger signals will go to each distribution box. There must be at least 4 independent triggers (for the four columns in each wedge). We do not want to pulse adjacent modules at the same time, so this will increase the number of trigger signals. Again, this needs to be defined in order to count the number of cables. The source of the pulser triggers is still undefined. One possibility is to use the VME 1495 with A395D boards for TT output, which can be programmed via VME.
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)
   • PRs have been submitted for all major parts. Expect delivery by mid Dec.
   • The SiPM holder was ordered directly from the 3D model, but has no official drawing release. We need to check with Chuck/Tim to ensure that we can recover the exact submission.
7. Temperature compensation (Jack)
   • Jumper maps for the two first article boards have been provided.
   • Jack finds a total of 16 outliers that cannot be fit into the existing jumper resistors. Fernando has proposed to put these sensors aside into a single module with modified resistor values.
8. Electronic boards (Fernando and Chris)
   • Upstream readout boards have arrived. There was a glitch with the downstream boards, but they are now being made. All parts, except for some amps are in hand and the PO for assembly is out. They should be sent out as soon as the downstream boards are complete.
   • A/C unit has come in. Hardware will be ordered and installed shortly thereafter.
9. Light guide gluing setup (Scot)