June 11, 2020 Calorimeter

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Meeting Time: 11:00 a.m. JLab time

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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. Efficiencies:
    1. BCAL: Elton to revive costheta_cm code and to pass onto another person.
    2. FCAL: Matt/Jon to revisit Jon's FCAL efficiency study.
  2. Long term items

Tentative Agenda

  1. Announcements:
  2. Action Items
  3. Run Updates
    1. FCAL
    2. BCAL
  4. Calibrations
    1. FCAL non-linearity causes [2]
  5. Monitoring
    1. BCAL LED
    2. BCAL (offline)
      1. Batches 5-8 (Tolga) [3]
    3. FCAL (offline)
  6. Reconstruction
  7. Efficiencies
    1. Photon Reconstruction Systematics Task Force
    2. Photon efficiencies for different run periods. 2D MC/data map in theta/E for systematic evaluation.
  8. Simulations
    1. Comparing simulation and data (Colin)
  9. Any other business

Minutes

Attending: Churamani, Colin, Jon, Mark D., Sean, Matt, Susan, Karthik, Tolga, Varun, Igal, Sasha

  1. Announcements:
  2. Action Items
    • See Photon Reconstruction Task Force below.
  3. Run Updates
    1. Tier 2 will likely return early next week. At that time, Mark Dalton will turn on calorimeter electronics in coordination with Elton and Colin.
    2. FCAL
    3. BCAL
      • Josh turned on the BCAL chillers today. Initially their temperature was set to 41 degF (default from running), but Elton asked that they be set to 64 deg until the detector and monitoring were back up and running.
  4. Calibrations
    1. FCAL non-linearity causes [4] (Igal)
      • The response of particle-gun showers were thrown at the Fcal for a range of incident photon energies. The threshold in hdgeant4 was eliminated so that the effects of leakage would be more apparent. Igal plotted the output of the clusterizer. This change reduces considerably apparent non-linearity in the MC.
      • Matt: There are thresholds associated with creating clusters and this may need to be removed if "pure" leakage is of interest. Ital will look into the clusterizer code to understand what thresholds are included.
  5. Monitoring
    1. BCAL LED
    2. BCAL (offline)
      1. Batches 5-8 (Tolga) [5]m(Tolga)
        • Tolga has reviewed the monitoring plots for the recent batches of data. Several anomalies were found.
        • Occupancy plots: Some hot channels. These were likely fixed by changing the FADC baseline.
        • Timing anomalies: 72123-72416 (2ns peaks), 72417-72435 (time offset) -> Mark
        • Hit efficiencies: 72316-72435 (especially visible in "enhanced" efficiencies) -> related to next item?
        • Recon Matching: 72271 (inefficiency at module~12, and 90deg), 72385 (degraded efficiency at module~47) -> Elton
        • Missing plots: 72306-72325. Susan: These are flagged as 'high-intensity scan', and many of the detectors were turned off.
    3. FCAL (offline)
      • Susan promised a report at the next meeting. (for status see next meeting's page).
  6. Reconstruction
  7. Efficiencies
    1. Photon Reconstruction Systematics Task Force
      • First meeting on Monday. Goal is to reproduce efficiency analyses using the latest MC for all three run periods. Anyone interested in helping should contact Elton or Mark. The task for will meet when there is an update.
    2. Photon efficiencies for different run periods. 2D MC/data map in theta/E for systematic evaluation.
      • One of the directives of the task force is to check reconstruction efficiencies in phase space relevant to upcoming cross section measurements.
  8. Simulations
    1. Comparing simulation and data (Colin)
      • Colin summarized effort to understand MC data in comparison with geant3 (HADR1 and HADR4 options) and geant4.
      • The event sample is g p -> eta pi- Delta++.
      • BCAL: Photons - offset of about 0.3 ns, but also a slewing as a function of shower energy in the data.
        • Mark has seen this in the data and after some checks decided "it was complicated". Will need further study
      • BCAL: pi- tail at to the high side for geant3 HADR1, compared to other simulations and data which seem to match. This had been the MC default; it is now loosing favor. geant4 behaves in some intermediate way between genat3 HADR1 and HADR4.
      • Elton: How are these differences affecting analysis? Colin and Sean: For now, there is little impact because the cuts are +/-1.5 ns. MarK: Note that as we start analyzing neutrons, these discrepancies become important.
      • Colin: Work is on going. Also, he is analyzing a fairly complicated channel. It would be useful if someone investigated similar distributions for a simpler channel, e.g. eta' production. Justin's PID action studies can be easily applied to a reaction of interest.
  9. Any other business