Mar 17, 2021 Calorimeter

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Meeting Day/Time: every other WEDNESDAY at 11:00 a.m. JLab time

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
  2. To join via Polycom room system go to the IP Address: 199.48.152.152 (bjn.vc) and enter the meeting ID: 907185247.
  3. To join via phone, use one of the following numbers and the Conference ID: 907185247.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
  5. More information on connecting to bluejeans is available.

Participant Direct Lines

  • JLab Phone in CC L207 is 757-269-7084 (usual room)
  • JLab Phone: in CC F326 is 757-269-6460
  • Phone in the Regina Video-conference Suite is 306-585-4204
  • Athens Phone: in Christina's office is 011-30-210-727-6947

References

  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book
  3. Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation

Goals for Calorimetry Group

  1. Determine preliminary photon reconstruction efficiencies as a function of E, phi and theta in data and simulation with a point-to-point precision of at least 5%.
  2. Measure systematics of pi0/eta mass calibration as a function of detector position to a precision of at least 5 MeV.
  3. Demonstrate agreement of photon reconstruction efficiency and resolution between data and simulation as a function of E, phi and theta to within 5%.

Action Items

  1. Short term CALWG Items
  2. Long term items
  3. Calorimeter work packages

Tentative Agenda

  1. Announcements
  2. Run Preparations
    1. FCAL
    2. BCAL
  3. Calibration
    1. BCAL
  4. Monitoring
    1. BCAL LED
    2. BCAL (offline)
    3. FCAL (offline)
      1. RunPeriod-2019-11
        1. LED efficiencies working on batch 1 (somewhat hindered by tape and cache situations) and looking for LED time shifts simultaneously
        2. comparison to raw data in progress
        3. coming up: 2020 batches 10, 11, 12 monitoring launch ver26
  5. Reconstruction
    • Churamani: Brief Update on Photon reconstruction from data in BCAL [2]
  6. Simulations
  7. Action Items
  8. Any other business

Minutes

Attending: Varun, Karthik, Sean, Mark, Jon, Susan, Churamani, Elton, Tolga, Rebecca, Malte, Chandra, Zisis

  1. Announcements
    1. Happy St. Patrick's day and happy green cash stimulus day!
  2. Run Preparations
    1. FCAL: no report
    2. BCAL: no report
  3. Calibration
    1. BCAL: Karthik reported that all 2020 files are now cached and this allows him to compete the non-linear correction (expected to be no more than 2%).
  4. Monitoring
    1. BCAL LED: no report; 2020 LED monitoring was done and reported last year.
    2. BCAL (offline): The batches are now available and Tolga will report on this work soon.
    3. FCAL (offline)
      1. RunPeriod-2019-11: Susan reported on the issue of crashes on certain 'sub runs'. This might be related to a time out. Sean clarified that even though the scripts are not multi-threaded, the EVIO code is, and it could be that a thread dies. Sean suggested that the online data can be compared to offline skims. Sean and Colin have a plugin to calibrate out the 4ns shifts, which was used on the 2018 data: after this though there was some left over jitter, which is why Susan is doing these studies.
        1. LED efficiencies working on batch 1 (somewhat hindered by tape and cache situations) and looking for LED time shifts simultaneously
        2. comparison to raw data in progress. Susan looked at the LEDs and hit patterns; a seesaw pattern is recognizable but not all dead channels are seen in data.
        3. coming up: 2020 batches 10, 11, 12 monitoring launch ver26: these batches are now in.
  5. Reconstruction
    • Brief Update on Photon reconstruction from data in BCAL. Churamani showed a good collection of plots, as seen in the link above, from the 2017 data. The peak for the eta-prime looks relatively clean, but contains perhaps 2,000 events from 2017, so 10,000 for all of GlueX-I. Sean suggested that the efficiency with errors bars be calculated, so that we can judge the viability of this method. Chrumani will aim to produce this and and update in the next 2-3 weeks, so that the work can be reported to the May Collaboration meeting together with the omega and b1 analyses.
    • Following a question by Elton on the expected statistics, Jon showed a comparison of the eta-prime, to the omega (revived his code) and the b1. Karthik will aim to produce more plots by next week, when he, Elton and Jon will meet.
  6. Simulations: no report
  7. Action Items: no updates
  8. Any other business: none