Dec 4, 2012 Calorimetry

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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+Canada
    • +1-303-248-0285 : International
    • then enter participant code: 3421244# (remember the "#").
    • or www.readytalk.com (and code without the #)

Participant Direct Lines

  • JLab Phone: in CC F326 is 757-269-6460 (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(s)

  1. Fcal cabling (Elton to find out status of cables ordered by JLab and status of labeling) All received
  2. Fcal contract extension (Elton to verify all is completed) Contract extension is in place.
  3. Provide feedback on dark room drawings (Tim) Tim has provided some feedback to the drawings.
  4. Provide updated SiPM data summary plots (Orlando)

Tentative Agenda

  1. Announcements
    • NOTE: In anticipation of loosing EVO at the end of this year, I propose we try the ReadyTalk facility at www.readytalk.com, use participant code 3421244. For this meeting, ESNET and EVO will also be available. These instructions are found at the top of the meeting page.
  2. Review of Action Items
  3. Monitoring Media:FCAL-Monitoring.pdf
  4. FCAL (Email from Matt, who won't be able to attend the meeting)
    • Dan is coming to IU this week to help finish off the CW base fabrication and testing. The frame should be ready to ship in one week.# USM update
  5. BCAL
    1. USM report
      1. parameters 1.2 V over voltage (Orlando)
      2. bad mppcs (Orlando)
  6. Simulations
  7. TDR update
  8. Calibration of Calorimeters
  9. Any other business

Minutes

Attendees:Elton, John, David, Yi, Beni, Tim (Jlab); Shaun, Zisis (UofR); Christina, Pavlos, Stratos (Athens); Alam, Will, Orlando, Hayk (USM);

  1. Announcements
    • NOTE: In anticipation of loosing EVO at the end of this year, I propose we try the ReadyTalk facility at www.readytalk.com, use participant code 3421244. For this meeting, ESNET and EVO will also be available. These instructions are found at the top of the meeting page.
  2. Review of Action Items
  3. Monitoring Media:FCAL-Monitoring.pdf (George)
    1. Tested 130x130 cm2 plexiglass sheet to measure uniformity
    2. Uniformity very non-uniform within 10 cm of LEDs, this is covered mostly by support structure
    3. Over most of the are of interest, the illumination is fairly uniform.
      • Elton asked about whether there is sufficient light for the Fcal. Christina: After present measurements are completed, the light output through a Pb glass block will be checked.
    4. Christina: 4000 Bcal LED boards have been sorted. Bare boards for the control boards have been given to Kappos to populate and test. Can be shipped once finished.
      • Elton: Jlab is closed between Xmas and New Year, so avoid that period for shipping.
    5. Fcal: First article should be completed before Xmas and will be shipped to Jlab for review.
  4. FCAL (Email from Matt, who won't be able to attend the meeting)
    • Dan is coming to IU this week to help finish off the CW base fabrication and testing. The frame should be ready to ship in one week.# USM update
    • Meeting is setup for Thu morning to discuss shipping support structure and schedule for alignment of blocks and start of stacking.
  5. BCAL
    1. USM report
      1. parameters 1.2 V over voltage (Orlando)
        • Presentation with updated data was presented at Vover=1.2V and 20 degC. Everyone agreed the presentation contained all the relevant quantities.
        • Zisis: Asked if plots can be make for different values of Vover (e.g. Vover = 1.1 and 1.0 V)
        • Zisis: Suggestion: Summarize results of measurements and share with Hamamatsu for comments and feedback.
      2. bad mppcs (Orlando)
        • Re-checking parameters of suspect ten MPPCs. After several checks, confirm that individual cells within the suspect MPPCs have a high dark rate.
        • Yi: Checked Hamamatsu data for some of the poor performing MPPCs and noted that the Hamamatsu data also show high dark rates.
        • Elton: Calculate the summed dark rate for each array. This is an integrated number, which first can be compared to the specs, but also allows quantitative comparison between sensors
  6. Simulations
    • No update
  7. TDR update
  8. Calibration of Calorimeters
  9. Any other business