Mar 6, 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)

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. Beamtest
    • Investigate if Hall B chiller is available for our use (Elton) Chiller will be used for the HPS beamtest.
    • Draft a run plan (Elton and Zisis)
    • Consider optimum configuration for 40 Bcal LED boards on mini-Bcal (Zisis, Elton, Christina): centre two columns on each side

Presentations from recent meetings

Tentative Agenda

  1. Announcements
  2. Review of Action Items
  3. BCAL Beam Tests 2012 - Check List
    1. Hall B (John)
    2. Mechanical (Tim)
    3. SiPMs/LGs/Cooling (Elton, Fernando, Scott)
    4. Monitoring: LEDs+boards+controller (Christina)
    5. Test full Mini Cal with cosmics
    6. LV, HV, VXS, Flash ADC, F1TDC, Discriminators, NIM, Trigger (Sascha)
    7. Online Coda/Analyzer / Data to disk/tape (Sascha)
    8. Logbook, e-log
    9. Run plan (Elton, Zisis)
    10. Simulations (Andrei, Irina)
    11. Manpower/shifts
  4. Update from USM
    1. Production Manager Report (Javiera)
    2. USM Web Interface to DB
    3. Light guide arrival
  5. Status of Testing at JLab
    1. Hall-D ELOG
  6. Other

Minutes

Attending:Elton, Yi, Eugene, John L., Beni, Tim, Sasha (JLab); Will,, Hayk, Javiera, Sergei, Orlando (USM); Zisis, George, Andrei, Mehrnoosh UofR); Christina, George, Pavlos (Athens).

  1. Announcements
  2. Review of Action Items
  3. Monitoring
    • Four SiPMs are being prepared for shipment (new rules require DOE approval)
    • Tracking indicates that LED boards have arrived at JLab.
    • Discussion about attaching LEDs into light guides so that they could be removed and returned to Athens for additional testing.
    • JLab will see how they fit on light guides and options for mounting and communicate offline.
    • Christina: Need to check pitch and flexibility of cable connecting boards. Jlab will provide feedback soon.
  4. BCAL Beam Tests 2012 - Check List
    1. Hall B (John)
      • Elton and John have installed a fourth "remote" scintillator at approximately the 45% position
    2. Mechanical (Tim)
      • Brackets are being machined
    3. SiPMs/LGs/Cooling (Elton, Fernando, Scott)
      • 80 SiPMs have been selected and are being readied for installation. They correspond to 8 voltage groups. Each SiPM has unique jumpers to span the range of sensors from Hamamatsu
      • Testing has not started yet. There is some ringing in the preamp boards. Fernando is investigating. Could be due to mismatches in impedance and or grounding problems.
      • Once the ringing is fixed, the sensors should be able to be tested in a couple of days.
    4. Monitoring: LEDs+boards+controller (Christina)
    5. Test full Mini Cal with cosmics
    6. LV, HV, VXS, Flash ADC, F1TDC, Discriminators, NIM, Trigger (Sascha)
    7. Online Coda/Analyzer / Data to disk/tape (Sascha)
    8. Logbook, e-log
    9. Run plan (Elton, Zisis)
      • John will coordinate schedules with other groups from Halls A and B.
      • The present goal is to install the mini-Bcal on Wed Mar 21, but could be a week later.
    10. Simulations (Andrei, Irina)
    11. Manpower/shifts
      • Zisis: Regina will have undergraduates that can help out with testing modules this summer.
  5. Update from USM
    1. Production Manager Report (Javiera)
      • Presented the mapping of electronic channels to SiPM pins
      • Received a new Wiener CAMAC controller for Station 2. This will allow them to increase the DAQ rate from 30 Hz to 1KHz
    2. Station 3 condensation problem.
      • A second heat exchanger, at the end of the box away from the sensors, has been included in the design from the beginning, so as to fully cool the interior of the box. Now they are using this second heat exchanger to dehumidify the air in the box as a workaround for the condensation problem.
      • The following procedure is followed: The heat exchanger near the LED (where condensation is not important) is set to 2 deg C. Then, after a delay, both heat exchangers are set to the desired temperature, e.g. 5 deg C. This procedure seems to work. There is presently no ventilation in the system.
      • A backup plan to circulate nitrogen has been costed.
      • Humidity in the room is about 45-50%.
    3. Station 3 Analysis (Hayk)
      • Alam has been working on fixing all channels and they are almost all working
      • Hayk has implemented a new method to extract the DR and Xtalk. The DR extraction is now twice previous analysis, but has a smaller temperature dependence.
      • Still using 120 ns gate. Planning to continue to use 120 ns for all measurements, but to also add an additional measurement with a gate of 1 micros and investigate sensitivity of results.
      • Extracted dark rate and dark current are inconsistent (more charge in dark rate). Investigating cause.
      • George Lolos: UofR has investigated the systematics of extracting the SiPM parameters as a function of many conditions and will make that available for reference.
    4. USM Web Interface to DB
  6. Light guides
    1. Will: Getting setup to high rate production of light guides.
    2. Missing light guide "K" is packaged and ready for shipment.
    3. Light guide arrival
      • Elton measured the relative light transmission of the light guide F using 3 different wrappings: tedlar, acid-free paper and Al mylar.
      • Within 10%, all wrappings resulted in the same transmission as no wrapping.
      • Tedlar was chosen for the wrapping because it eliminates extraneous light (i.e. opaque) and is thin.
  7. Status of Testing at JLab
    1. Hall-D ELOG
  8. Other