Jan 24, 2012 Readout
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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
-
Understand differences in PDE measurements between JLab, USM and UofR.Full discussions underway
Presentations from recent meetings
- Update from USM at Bcal Readout Meeting
- Presentations at Cal Working Group Meeting
- Presentations at PDE Discussion on Jan 20
- SiPM PDE extraction at Regina
- Comparison of PDE measurements in literature (Elton)
- Comparison of Current vs Rate (Yi)
Tentative Agenda
- Announcements
- Review of Action Items
- Update from USM
- USM Web Interface to DB
- Discussion of PDE measurements
- Status of Testing at JLab
- Other
Minutes
Attending: Javiera, Hayk, Will, Serguei (USM); Elton, Yi, John, Beni, Tim (Jlab); Zisis, Mehrnoosh, George, Andrei (UofR); George, Pavlos, Christina, Stratos (Athens)
- Announcements
- Review of Action Items
- Monitoring (Athens)
- Kappos has finished the design for the Bcal boards. They will send the design to JLab later today or tomorrow.
- The Fcal design should be completed on Monday.
- Elton said that Christina should go ahead and submit an invoice for this milestone, so that it can proceed in parallel with the submittals.
- Samples of flexible cable pcs are being ordered from two companies with large cost difference to see if the lower cost company is acceptable.
- Update UofR
- Mehrnoosh has started PDE measurements with the laser and a 120 ns gate. They will be reported soon
- Update Jlab
- SiPM production testing is nearly ready
- One of four boards is mounted, software is almost ready. Additional transition boards to ADC also need to be populated.
- Update from USM
- run manager report
- All first-article SiPMs have been measured in the stage 2 setup
- Number of boards per day has been tracked and the time has been reduced to allow about 5 tests per day
- Expect to have 40 units tested by the weekend.
- Thermisters in stage 3 setup were calibrated last week. Found some burned out amplifiers and replaced.
- Two MPPCs arrived with bent pins. Hamamatsu should be notified and requested to improve their packing and replace the two damaged sensors
- Second shipment of SiPMs is in customs in Santiago.
- Gain comparisons
- Plots show gain measurements with station 3, giving G~7-8x10^5. Fluctuations across cells is likely due to amplifier gain determinations
- The overvoltage used by USM is 71.1 V (20 deg) vs Hamamatsu Vop = 72.6 (25 deg) ~ 72.3 V (20 deg). These differences do not make sense as the Hamamatsu voltage, as determined by JLab, is 0.9 V above breakdown.
- The JLab PDE measurement for a gain of 7.5x10^5 is 27%, very close to the USM measurement. However, note that the USM PDE measurement was performed in station 2 and the gain measurement in station 3, which could have systematic differences.
- Checks are ongoing.
- Elton: Asked about the thermal contact of SiPMs to cooling plate in station 3. At the moment there is not contact, but tests are ongoing at 5 deg to check how important this is.
- USM also has some measurements of cross talk (16-25%) and dark rate. However, the data are not yet in a form which is easy to plot. They will do this shortly.
- run manager report
- USM Web Interface to DB
- Discussion of PDE measurements
- Status of Testing at JLab
- Other
- Elton asked if Zisis could run the Cal Working group meeting next Tuesday and he agreed. Thanks!