Revision as of 17:40, 21 August 2020

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. Short term
   1. Richard Jones' work on G3vG4: run photon, pi+, pi-, proton particle guns. Who?
   2. Efficiency study: model mass and t-distributions
   3. Hadronic split off studies
   4. Covariance matrices for photons; should be redone.
   5. BCAL Wiki reorganization -> All
2. Long term items
3. Complete Calorimeter work packages

Tentative Agenda

1. Announcements
2. Action Items
3. Run Update
   1. FCAL
   2. BCAL
4. Monitoring
   1. BCAL LED
      1. BCAL LED Monitoring fall 2018 (Sarah) [2]
      2. Dark rate (SiPM) study update (Varun) [3]
   2. BCAL (offline)
      1. Brief monitoring update, batches 5-8 "redo" (Tolga) [4]
   3. FCAL (offline) FCAL monitoring V (Su)
5. Calibration
6. Efficiency
   • Costhe Efficiencies (Elton)
7. Reconstruction
8. Simulations
   1. Log Entry 3830769 Hadronic Efficiencies (Elton)
      • CCDB: BCAL/channel_mc_efficiency
      • M22U S3 L4, eff=0 R72120-72435
      • M37D S4 L1, eff=0 R72316-72369
9. Any other business

Minutes

Attending: Varun, Sarah, Zisis, Tolga, Dhruval, Cplin, Mark, Karthik, Matt, Rebecca, Elton, Jon, Sean, Susan

1. Announcements: none
2. Action Items
   1. Short Term
      1. Particle guns: Regina will do.
      2. Efficiency: See agenda below
      3. Splitoffs: Matt reported that Rebecca will check the neural network on data and MC to see if it is modeled correctly (this was done based on data). This is connected to the Task Force on photon reconstruction. It is a short term job. Zisis mentioned that a new MSc student (Azizah Mahmood) will likely work on ML for FCAL-II. Matt mentioned that any work with MC sims needs to be validated with data.
      4. Covariance matrices: nothing to report
      5. Wiki: Colin will start the FCAL Wiki reorganization.
   2. Long Term: nothing to report.
   3. Work packages: not discussed today.
3. Run Update
   1. FCAL:
      1. Bases: Mark reported that all spare bases have been used in replacing faulty ones placing the FCAL in the green. Another 20 or so will be needed in the next couple of weeks. Matt suggested that the PMTs+Bases be sorted and classified based on the particular problem (lemo cable connections, coax ripped out of socker, high current draw). Some of these can be repaired by Chris at the lab, others require the application of conformal coating so Paul Smith should be consulted. Colin added that plans should be made during the shutdown to be proactive and accommodate PrimEx requirements with good PMT+Base in the inner rings.
      2. Scalers: two channels w/o scaler rate but occupancy looks normal. Check on the scope; Mark will do at next access.
   2. BCAL: nominal operation. Elton asked about the FP firing. Varun is changing the code to use energy as a criterion (used to be like this when Foda first designed it) instead of the number of hits being > 1200 to indicate an LED event. [After the meeting Varun checked in the code and Mark pulled it.] This will help us identify LED pulses that are stolen by the physics trigger.
4. Monitoring
   1. BCAL LED
      1. BCAL LED Monitoring fall 2018 (Sarah Shoobert): Motivated by features seen in LEDs and SIPMs in the fall 2019 data (e.g slope versus in run number), Sarah carried out a study on the fall 2018 LED events. Two SiPMs were identified as having an issue (1118 was known, 1405 the new one) whereas many LEDs are showing fluctuations. The full list is in her slides. Fall 2018 overall exhibits same bahaviour as Spring 2019.
      2. Dark rate (SiPM) study update (Varun) [5]: An update was given by Varun, who plotted the
   2. BCAL (offline)
      1. Brief monitoring update, batches 5-8 "redo" (Tolga) [6]
   3. FCAL (offline) FCAL monitoring V (Su)
5. Calibration
6. Efficiency
   • Costhe Efficiencies (Elton)
7. Reconstruction
8. Simulations
   1. Log Entry 3830769 Hadronic Efficiencies (Elton)
      • CCDB: BCAL/channel_mc_efficiency
      • M22U S3 L4, eff=0 R72120-72435
      • M37D S4 L1, eff=0 R72316-72369
9. Any other business