Mar 10, 2011 Readout

Teleconference Time: 10:30 a.m. EST

• ESNET 8542553 and EVO session
• JLab Phone: in CC F326 is 757-269-6337 (usual room)
• JLab Phone in CC L207 is 757-269-7084
• Phone in the Regina Videoconference Suite is 306-585-4204
• Phone:
  • +1-866-740-1260 : US and Canada
  • +1-303-248-0285 : International
  • then use participant code: 3421244# (the # is needed when using the phone)
  • OR from www.readytalk.com type access code 3421244 into "join a meeting" without the # (you need java plugin)

Items for followup from previous meeting

1. Zisis will send the Regina light guide requirements to Will.

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Time of meeting
4. USM update
5. SiPM update
   1. First Article testing
6. Simulations
7. Electronics/cooling
8. Geometry and light guides

Minutes

Attending: Zisis, Andrei (UofR); Elton, Eugene, Beni (JLab); Will (USM). Mihajlo (IU)

1. Announcements
   • First article SiPM samples (80) arrived yesterday.
2. Review of Action Items
3. Time of meeting
   • Decided to move the time to 11:00 am. Poll group if Bcal and Cal Working meetings could be moved to Tuesday.
4. USM update
   1. Completing response to JLab solicitation for testing SiPMs
      • Developing solutions to handle advance payments to Hamamatsu
      • On the technical side: We need to carefully consider how to handle the temperature dependence of specifications. Hamamatsu is testing at room temperature. We are mainly interested of the performance at 5 deg, where we expect to operate. If there are systematic differences due to the temperature we will have to decide how to compare the differences
   2. Sent out large electronic boards for fabrication. It is a 6-layer board and 2 out of 8 required have been ordered. Expect delivery in about 3 weeks.
   3. Dark box now insulated and black coating inside to reduce temperature changes due radiation
   4. This box provides a single uniform light source to all 32 SiPMs under test. A second station is under construction that illuminates individual arrays via fibers.
   5. Testing is accomplished using 2 CAEN V792 QDCs (2x32 channels).
      • 512 cells tested at one time (32 arrays x 16 cells) by multiplexing and using multi-event capability of QDC
      • Analog multiplexors controlled using micro-processors in a slow control loop. Multiplexors developed commercially and used in Gigabit analog signal processing.
5. SiPM update
   1. Test setup for first article testing is ready
   2. Samples have arrived and testing will start soon.
6. Simulations
   1. Andrei and Irina have had a setback due to changes in the software environment at IU, which is incompatible with previous versions used to obtain Bcal resolutions
      • Have decided to rerun previous simulations to ensure compatibility with new configurations
      • Hope to be able to report on new results next week
      • Will get on the agenda for the next software meeting to discuss issues of code stability.
   2. Mijahlo has started looking at the Bcal code to study differences between electromagnetic and hadronic showers.
      • Investigating how the code can be used to easily access time/energy/position variables during shower reconstruction
      • Dave has posted a note on the portal GlueX-doc-1710 documenting the status of shower split-offs.
7. Electronics/cooling
   • JLab has an advanced concept for mechanical cooling and the electronic boards for the readout. Will report at the next Bcal readout meeting. SiPM electrical and cooling weekly meetings at JLab to review progress are ongoing.
8. Geometry and light guides
   • No update