Jul 10, 2012 Readout
From GlueXWiki
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)
Contents
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
- SiPMs
- Investigate the optimum overbias setting for the SiPMs (Serguei and Orlando)
- Monitoring
-
Check on payment for first article delivery (Elton)Payment has been made
-
Presentations from recent meetings
Tentative Agenda
- Announcements
- Review of Action Items
- Update from Athens: monitoring
- Update from USM
- SiPM Update (Javiera)
- Working Point Analysis (Orlando)
- Light guides (Iñaki)
- Status of testing at JLab
- BCAL Beam Tests 2012:
- Status of work at Regina
- Simulations
- BCAL Cosmics at Regina
- Other
Minutes
Attending:Elton, John, Zisis, Shaun, Tara, Eugene, Yi, Tim (Jlab); Will, Javiera, Orlando, Hayk, Iñaki (Jlab); Christina, Stratos, George (Athens).
- Announcements
- Review of Action Items
- Update from Athens: monitoring
- 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.
- 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.
- Fabrication
- Update from USM
- 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.
- 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.
- 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.
- SiPM Update (Javiera)
- Status of testing at JLab
- 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.
- Hall-D ELOG.
- BCAL Beam Tests 2012:
- 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
- Simulations
- BCAL Cosmics at Regina
- Other