Aug 22, 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. 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
6. Efficiencies
7. Simulations
8. BCAL Deep Learning
9. NIM articles
10. Any other business

Minutes

Attending: Elton, Mark, Jon (JLab); Karthik, Dhillon, Varun, Ahmed (Regina); Tolta (FIU)

1. Announcements
2. Action Items
3. We touched on the Calorimetry Work package. See below under simulations for updates from Karthik
4. Run Updates
   1. FCAL
   2. BCAL
5. Calibrations
6. Monitoring
7. Efficiencies
8. Simulations
9. 1. • Starting to reproduce studies with the BCAL that Jon had completed for the FCAL. The first was to study the efficiency with a particle gun.
      • Events were generated over the range of 10-120 deg and from 0 - 6 GeV
      • Distributions of measured energy were obtained. They look Gaussian with little background. The data (for a 0.5 bin in energy) were fit to a Gaussian and a pol2 background.
      • The efficiency was computed as the integral under the Gaussian within +/-3sigma divided by the number of thrown events in that interval.
      • Mark: Suggests to ignore the background term and compute the efficiency taking the events within +/-3 sigma from the covariance matrix (instead of Gaussian fit) divided by the number of thrown events.
      • Elton: Check that this new method is consistent with the previous.
      • Jon: Use the MC to determine where photons are lost. Conversions in the material upstream of the BCAL? Material in the CDC/FDC? Loss of events in the reconstruction? Information to determine sources needs to be requested via a custom control.in file. Karthik can get details from Jon.
10. BCAL Deep Learning
11. NIM articles
12. Any other business