Mar 7, 2019 Calorimeter

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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. Complete Calorimeter work packages
  1. BCAL: Check pulsing rate of LED triggers when FP trigger bit is missing (start with early runs in fall 2018). With discerning software, check pulsing rate of later runs where it appeared that the downstream FP LED bit was not firing. (Ahmed)
  2. BCAL: Check that latest gain ratios are uploaded for spring 2018 (Mark).

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. Reconstruction and Simulation
  6. Monitoring
  7. NIM articles
  8. Any other business

Tolga: The Pedestal code is located here, modifications to FCAL_online plugin: /w/halld-scifs17exp/terbora/JEventProcessor_ped_test.cc It is broken now, but I am making corrections as I speak and the file will be cloned there as I go.

Minutes

Attending: Richard (UConn); Ahmed, Zisis, Tegan (Regina); Curtis, Will (CMU); George (Athens); Matt (IU); Tolga (FIU).

  1. Announcements
  2. Action Items
    1. Tolga: Will briefly update on FCAL pedestal code project for group's information. Was focused on later agenda item so I did not produce updated plots today. Talk: https://halldweb.jlab.org/DocDB/0039/003939/001/FCALPEDESTALa.pdf
      • Reviewed some plots obtained from pedestal and occupancy plots for FCAL. There were several questions and it was suggested that Tolga send specific information regarding the production and scripts to obtain the plots.
  3. Run Updates
    1. FCAL
      • Standard maintenance. Failure rate is about 2-3/week of bases that die. Other failures (communication) fell from last fall att 1/day -> 1/week.
    2. BCAL
      • Pedestals seemed non-uniform and Serguei has taken a new run. We are waiting to see how the BCAL will be used in PRIMEX to understand the calibration effort needed for this period. It may be that only 4ns shift calibration will be needed. Although, Mark uses tracking for that calibration and no drift chambers are currently being read out.
  4. Calibrations
  5. Reconstruction and Simulation
    1. GlueX-doc-3852 HDGeant, HDGeant4 cal systematics (Richard)
      • Richard repeated his study of MC showers from hdgeant3 and hdgeant4 in FCAL and BCAL and compared to generated.
      • Main effect was about a 30 MeV shift in reconstructed energy relative to generated.
    2. The work above should be reconciled with this log entry: [3]
    3. Tolga: Wants to discuss if reopening photon/neutron separation analysis is viable to potentially study calorimeter response for a couple neutral channels that I am looking at. Slides: https://halldweb.jlab.org/DocDB/0039/003938/001/AN%20N%20CAL.pdf
    4. GlueX-doc-3875 Cal Efficiency using the CosThe Method (Elton)
  6. Monitoring
  7. NIM articles
  8. Any other business

Tolga: The Pedestal code is located here, modifications to FCAL_online plugin: /w/halld-scifs17exp/terbora/JEventProcessor_ped_test.cc It is broken now, but I am making corrections as I speak and the file will be cloned there as I go.

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