Jul 10, 2012 Readout

Teleconference Time: 11:00 a.m. EST

• ESNET (Number is 8542553) and EVO session (GlueX Calorimetry meeting room)
• Phone connection only upon request.
  • +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)

Participant Direct Lines

• 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
• Athens Phone: in Christina's office is 011-30-210-727-6947

Items for followup from previous meeting

1. SiPMs
   • Investigate the optimum overbias setting for the SiPMs (Serguei and Orlando)
2. Monitoring
   • Check on payment for first article delivery (Elton) Payment has been made

Tentative Agenda

1. Announcements
2. Review of Action Items
3. Update from Athens: monitoring
4. Update from USM
   1. SiPM Update (Javiera)
   2. Working Point Analysis (Orlando)
   3. Light guides (Iñaki)
5. Status of testing at JLab
   1. Hall-D ELOG.
6. BCAL Beam Tests 2012:
7. Status of work at Regina
   1. Simulations
   2. BCAL Cosmics at Regina
8. Other

Minutes

Attending:Elton, John, Zisis, Shaun, Tara, Eugene, Yi, Tim (Jlab); Will, Javiera, Orlando, Hayk, Iñaki (Jlab); Christina, Stratos, George (Athens).

1. Announcements
2. Review of Action Items
3. Update from Athens: monitoring
   1. Fabrication
      • Reordered components, expect 3 weeks ARO
      • Digi key small connectors are the pacing items, expect delivery Aug 20
      • Boards are in hand
      • Flexi-cable cleared today, expect delivery in about 10 days
      • First delivery of cards expected mid Sept.
   2. JLab testing
      • Summer student (Tara) has taken many runs at different LED bias voltages. Find that the range of voltages 4-6.5 V cover the ADC range. George verified that operating the LEDs at these voltages should be fine. The data are still under analysis and will be presented in a couple of weeks.
4. Update from USM
   1. SiPM Update (Javiera)
      • 1800 MPPCs stage 1, 1600 MPPCs stage 3, 1300 MPPCs stage 2. Have measured 80 extra units in stage 2.
      • 5th delivery from Hamamatsu delayed, expected next week.
   2. Working Point Analysis (Orlando)
      • Summary of pde, gain, pde*gain and amplitude rms/mean distributions shown for several temperatures and sensors as a function of operating voltage.
      • Mix of various temperatures will be separated out in to separate plots (Orlando).
      • Understanding of how these relate to the specifications needs to be understood.
   3. Light guides (Iñaki)
      • Waiting on spare parts for machine, expected this week
      • Once in hand, the part will be exchange and recalibrated
      • Pieces on hand show dispersion on the order of 80-100 microns for D type. Dispersion is less, about 20 microns for B type. The D type guides might still meet specifications.
      • Iñaki will send JLab list of deviations for all light guides this week.
      • Tim: Suggest that a table be presented with progress at each stage.
      • Tim: What is the schedule for the first couple of light guide sets. Assuming that the machine part comes in this week, the first sets could be shipped in a couple of weeks.
5. Status of testing at JLab
   1. Hall-D ELOG.
      • Yi is working with summer student Ben St. Laurent on analyzing the data.
      • 1050 production units tested at 15 degC. Good agreement with Hamamatsu data.
      • To date one unit that fails specs has been found.
      • Data has been taken to investigate cross talk and after pulsing at different voltages. These data should allow determination of the optimal operating point for the SiPMs.
      • Ben will present a summary in a couple of weeks.
      • Will: Is it possible to operate the SiPMs at 15 degC in the experiment. Elton: Yes, before irradiation, the dark count is acceptable.
6. BCAL Beam Tests 2012:
7. Status of work at Regina
   • Cosmic-rays are setup at UofR, considering reconfiguring the DAQ.
   • Cosmics have been collected at Vover=0.9V and now taking data at Vover=1.2 V.
   • Planning to add amplification to be able to measure timing resolutions with cosmics
   1. Simulations
   2. BCAL Cosmics at Regina
8. Other