Mar 21, 2019 Calorimeter

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Meeting Time: 11:00 a.m.

  1. To join via a Web Browser, go to the page [1]
  2. To join via Polycom room system go to the IP Address: ( and enter the meeting ID: 907185247.
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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


  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)

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
    1. File:Fall18 gain calib.pdf
    2. Study of Fiducial Cuts for Photons in the BCAL/FCAL Transition Region
  5. Monitoring
  6. NIM articles
  7. Any other business


Attending: Zisis, Elton, Karthik, Mark, Sean, Colin (JLab); Tegan, Ahmed (UofR); Will, Curtis (CMU); Christina, George (Athens); Matt,, Jon (IU); Tolga (FIU).

  1. Announcements
  2. Action Items
  3. Reviewed status of Calorimeter work packages. I have added item numbers for ease of identification. We have been asked to produce a summary document on these questions to be reported at the next collaboration meeting.
    1. See report under calibrations
    2. This is on Karthik's plate as he completes the pi0 calibration
    3. Completed. Sean: Add link in last column to summarize work (Colin)
    4. Jon needs to summarize work to date as well as make programs available for continuity. Matt: Data/MC agree in analysis, but efficiency is higher by about 5% than calculated using photons from particle gun. This needs to be understood.
    5. Need volunteer. Repeat Jon's analysis for BCAL. Use w -> pi+ pi- pi0, pi0->gg.
    6. Repeat previous efficiency study using w->pi0 g decay. Lower branch, but wider kinematic range.
    7. Added this new item. Study relative efficiencies in FCAL and BCAL using the Costhe Efficiency method.
    8. Need volunteer to study FCAL resolution vs momentum and angle. Compare to MC.
    9. Need volunteer to study FCAL resolution vs momentum and angle. Compare to MC. Initial studies completed for NIM paper, but need to expand systematic studies.
    10. Need volunteer to study neutral/charged BCAL timing resolution differences. This item has lower priority than others above.
  4. Run Updates
    1. FCAL
    2. BCAL
  5. Calibrations
    1. File:Fall18 gain calib.pdf
    2. Study of Fiducial Cuts for Photons in the BCAL/FCAL Transition Region
  6. Monitoring
  7. NIM articles
  8. Any other business