Sep 5, 2019 Calorimeter

Meeting Time: 11:00 a.m.

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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

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 east 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

Short term items:

1. Investigate uniqueness tracking for efficiency calculations in calorimeters (Jon)
2. Contact Shaun to determine selection cuts for the skimming of pi0 data so that he can match that with the BGGEN sample (Karthik) Karthik found a bug in code in coordination with Sean.
3. Complete Calorimeter work packages

Long term items:

1. From Mike's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal. See Sep 21, 2017 Calorimeter Meeting.
2. FCAL: It has been noticed that the pi0 mass shifts when the LED pulser runs at high rate. This is still not understood. See Log Entry 3595928 and references. Several runs have been taken in raw mode. These runs exhibit the shift in pi0 mass with LED running at 1 kHz. There is a need to analyze these to try to determine the cause:
   1. 50634 - FCAL Green LED: 1kHz, 29 V, Livetime is 9%, 1.7 M events
   2. 50635 - FCAL Violet LED: 1kHz, 22 V, Livetime is 9%, 1.4 M events
   3. 50636 - FCAL Blue LED: 1kHz, 15 V, Livetime is 9%, 1.5 M events

Tentative Agenda

1. Announcements
2. Action Items
3. Run Updates
   1. FCAL
   2. BCAL
4. Calibrations
5. Monitoring
   1. LED Monitoring Update File:Sep5 LEDupdate.pdf
6. Efficiencies
7. Simulations
8. BCAL Deep Learning
9. NIM articles
   • GlueX detector
   • link
10. Any other business

Minutes

Attending: Elton, Jon, Colin, Mark (JLab); Teagan, Karthik, Ahmed, Zisis, Varun (UofR); Matt (IU); Churamani, Tolga (FIU); Christina, George (Athens); Sean (FSU).

1. Announcements
2. Action Items
   • Jon is thinking about how uniqueness tracking could be affecting the efficiency. Initial thoughts point changes in the errors but not the determination of the efficiency.
   • Karthik gave an update on pi0 peak dependence on z. He is using the latest Bggen 2017 b1 sample. He sees some strange stripes in the z1 distribution. Elton suggested it might be due to a binning effect.
   • Tolga has received input from Sean on how to move forward.
3. Run Updates
   1. FCAL
   2. BCAL
4. Calibrations
5. Monitoring
   1. LED Monitoring Update File:Sep5 LEDupdate.pdf
      • Varun with Ahmed's guidance is generating standard plots that show the response of each channel to LED pulser.
      • They find 10 problematic channels (9 in layer 4 and 1 in layer 3).
      • Elton: We should see if these channels can be fixed for the upcoming data run.
6. Efficiencies
7. Simulations
8. BCAL Deep Learning
   • Karthik: Writing a report and plan to report at the next meeting.
9. NIM articles
   • GlueX detector
   • link
   • We had a brief discussion of contributing to the detector NIM paper.
   • Elton has drafted a section on the BCAL. We need a similar description for the FCAL.
   • The BCAL resolution figure will be the eta mass resolution converted into energy resolution as a function of energy. Mark has requested 2018 data to update the BCAL NIM plot with higher statistics. He volunteered to generate a similar plot for the FCAL. He notes that these etas are at higher energy so may not be very sensitive to the stochastic term.
   • Colin: Resolution plots for the pi0 pose complications in interpretation so are not ideal for a performance summary.
10. Any other business
    • Looking for a volunteer to give a single talk on BCAL and FCAL at the next collaboration meeting.