May 15, 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
-
Send drawings of light guide gauges to USM (Elton)sent e-mail yesterday - SiPMs
- Plot dark rate of SiPM measurements under the same conditions as for Hamamatsu for each of comparison (Orlando and Serguei)
Presentations from recent meetings
Tentative Agenda
- Announcements
- Review of Action Items
- Talks at the Collaboration Meeting May 21-23
- Update from USM
- Status of Testing at JLab
- BCAL Beam Tests 2012
- Updates (Elton)
- Run 597:Event 16 (Andrei)
- Discussion of data and additional work needed
- Other
Minutes
Attending: Will, Orlando, Iñaki, Javiera (USM), Elton, Yi, Beni, Tim, Serguei (Jlab); George, Pavlos, Stratos (Athens); Andrei (UofR)
- Announcements
- Review of Action Items
- Talks at the Collaboration Meeting May 21-23
- Looked at proposed agenda.
- Shortened Fcal status to 15 min.
- Added two talks from USM. Will request additional 15 min for our session from Curtis.
- Update from USM
- Production manager report (Javiera Quiroz
- Plan is to ship first 400 tested units to JLab on Friday May 18
- Insurance has been purchased for the shipment
- The PDE determinations in Station 3 are not consistent. For the first shipment the PDE for all units have been measured in Station 2
- Expectation is that the PDE measurements in station 3 will be sorted out, but for now a larger fraction of units are being measured in station 2, which is producing reliable measurements
- A study of PDE from station 3 (Orlando Soto)
- Systematics of the PDE measurement in station 3
- Light source is being calibrated by fitted functions to determine the PDE, but results are not consitent
- Yi: Jlab is making a table look up for the light intensity across our setup
- Serguei: the LED and SiPM are in the same volume and affected by the same temperature changes, so they may be seeing light intensity variations of the light source.
- Light Guides (Iñaki)
- Question about the tolerances on the planar surface note on Rev 3 of the drawings. The tolerances are determined by the dimensions on the light guide
- USM is proceeding with a schedule to produce sets of 40 light guides, which populate one end of the Bcal, which will help JLab with the gluing schedule
- Fabrication of the jig for light guide A is complete and in use
- Design and fabrication of the jigs for other light guides is underway to accommodate the new schedule
- The machine for polishing is being assembled, and polishing should start next week
- The polishing is by hand, but the machine is setup with 3 types of plates corresponding to 5 micron, 1 micron and 0.3 micron polishing solutions
- The machine has a motor to regulate speeds
- Description of the setup will be prepared for the collaboration meeting next week
- USM Web Interface to DB
- Production manager report (Javiera Quiroz
- Status of Testing at JLab
- Hall-D ELOG.
- The production testing has started and 100 units have been tested. The measurements determine the PDE, DR and breakdown voltage at 15 deg C
- Monitoring (George)
- Boards for control boards (3) have been received in Athens are being populated. Will ship 2 control boards to JLab next week. One will be kept in Athens for tests.
- The new board design has protection against power surges
- A silk screen has been added so that the boards themselves are self-explanatory
- BCAL Beam Tests 2012
- Updates (Elton)
- Run 597:Event 16 (Andrei)
- Discussion of data and additional work needed
- Considerable discussion followed on the latest results from the beam test, especially related to possible effects of spectra with different biases turned on
- Yi was going to investigate the time dependence of the spectra
- Andrei: Requested that we fix the one side of the trigger paddle that had failed if there is an access. Then retake data with all biases on at Vover=1.2 and 0.9 V.
- Elton: Hope to take data with single biasses at Vover = 0.9V.
- Other