February 2, 2022 Calorimeter

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

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Our meeting ID number is 160 855 2106. Click "Expand" for more details.

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       Meeting ID: 160 855 2106
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  1. FCAL HDFCAL log book
  2. BCAL HDBCAL log book
  3. CCAL HDCCAL log book
  4. Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation
  5. Photon Reconstruction Task Force
  6. BCAL calibration links, 2020, PrimEx, SRC

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
  4. AI - BCAL Monitoring:
    1. Hydra Real-Time Dashboard
    2. Hydra 24-hr Monitoring Logs

Tentative Agenda

  1. Announcements
  2. Past Meeting Minutes
  3. Shutdown tasks
    1. Evaluation of hardware (Matt's email 2022-01-10) for February Collaboration Meeting
    2. Review Action Items
  4. Run Operations
    1. FCAL
    2. BCAL
    3. CCAL
  5. Calibration
  6. Monitoring
    1. BCAL LED
    2. BCAL (offline)
    3. FCAL (offline)
      1. FCAL LED efficiency maps
      2. FCAL pi0 mass shifts, LED pulser at high rate
    4. CCAL (offline)
  7. Reconstruction
    1. Churamani: Brief update on data/simulation with reference to bcal efficiency study [1]
  8. Simulations
  9. Action Items
  10. Any other business


Attendees: Tolga, Varun, Mark, Elton, Eugene, Matt, Stjepan, Churamani, Malte, Karthik, Rebecca, Jon, Zisis

  1. Announcements:
    1. Elton announced the passing of Javier Gomez.
  2. Past Meeting Minutes
    1. Zisis reviewed the minutes.
  3. Shutdown tasks
    1. Evaluation of hardware (Matt's email 2022-01-10) for February Collaboration Meeting
      1. BCAL: we need to revisit the dark rate (pedestal runs) and summarize the effect towards estimating the dose to SiPMs. Elton will collect the past work that was done by Yi and others. We took such runs in August and should take new ones now, after the fall run period. Eugene reminded us that there is a neutron dose monitor downstream of the solenoid, which could provide a relative scale for the does; its information for the last 2 years is easy to access through EPICs and older numbers should be accessible. A MC could be used to normalize to the neutron detector location. We should also refer to Alexandre's document, DocDB-5383. Mark mentioned that small, gradual decrease of the gains, in addition to the dark rate/pedestal RMS deterioration. Constants from ccdb shoaled be looked at. Regina will do this and we will check correlations (e.g. vs intensity)
      2. FCAL: Mark reported that radiation tests in Hall B are ongoing, to check the lock up (loss in communication) at high rate. Matt commented that this resolves a lingering mystery. The new firmware does not work in resetting the bases. Nick will install relays to reset 100 bases at a time. Technical details of this were discussed (Malte will investigate if the existing CAN bus can be used for this). A brief discussion ensued connected to radiation damage in the lead glass near the beam hole. FCAL-II will address that, but then we will need to adjust the gains on the PWO due to self-annealing behaviour.
    2. Review Action Items: Mark and Zisis will work on these offline.
  4. Run Operations: no additional reports.
  5. Calibration: no report.
  6. Monitoring
    1. BCAL LED: Varun will look at the fall run period's effect on radiation damage to the SiPMs.
    2. BCAL (offline): Tolga briefly reports that runs 81260-7 look mostly ok.
    3. FCAL (offline): no report (Susan sent regrets in advance of the meeting).
    4. CCAL (offline): no report.
  7. Reconstruction
    1. Churamani gave an update on data/simulation with reference to bcal efficiency study. He is now using a Gaussian+Pol-3 for his fits, and these seem to behave ok. He looked at G3 Hadr1 and Hadr4 nd G4. Zisis referred Churamani to Tegan's work in DocDB-5166 that shows Hadr1 should not be used as it generates unrealistic tails. Churamani is consulting with Jon on understanding the DMCTrajectory points.
  8. Simulations: no report
  9. Action Items: see above (shutdown tasks).
  10. Any other business: none.