November 10, 2021 Calorimeter

From GlueXWiki
Revision as of 11:20, 8 December 2021 by Zisis (Talk | contribs) (Minutes)

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Meeting Day/Time: every other WEDNESDAY at 11:00 a.m. JLab time

  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.
  3. To join via phone, use one of the following numbers and the Conference ID: 907185247.
    • US or Canada: +1 408 740 7256 or
    • US or Canada: +1 888 240 2560
  4. Upon connection all microphones are automatically muted. To unmute your mike on a Polycom or equivalent unit, enter *4. Unmuting on a computer is trivial as there is a microphone button than can be clicked.
  5. More information on connecting to bluejeans is available.

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
  3. CCAL HDCCAL log book
  4. Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation
  5. Photon Reconstruction Task Force

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 CALWG Items
  2. Long term items
  3. Calorimeter work packages
  4. AI - BCAL Monitoring:
    1. Hydra Real-Time Dashboard
    2. Hydra 24-hr Monitoring Logs

Tentative Agenda

  1. Announcements
  2. Run Operations
    1. FCAL
    2. BCAL
    3. CCAL
  3. Calibration
  4. Monitoring
    1. BCAL LED - brief update : Varun
    2. BCAL (offline)
      1. Follow-up to occupancy monitoring early-late October (Tolga) [2]
    3. FCAL (offline)
  5. Reconstruction
    1. Brief Update on "BCAL PHOTON SHOWER": Churamani[3]
  6. Simulations
  7. Action Items
  8. Any other business


Attendees: Mark, Rebecca, Malte, Sean, Tolga, Elton, Varun, Igal, Churamani, Karthik, Zisis

  1. Announcements: none
  2. Run Operations
    1. FCAL: Mark reported that 10 FCAL bases were replaced. The stockpile has decreased but the team is working to keep it up; the testing on the stand in EEL takes about 1 month. New boards have been installed on approximately 1/2 of the FCAL.
    2. BCAL: hot channels in the BCAL, possibly due to baseline drifts. This affects monitoring as it can suppress the occupancy plot scales. "Really" hot ones can affect the efficiency unless taken care of properly in ccdb. Some failures in the past were due to temperature variations. The DAQ/FADC is the fragile part of this operation. We are considering this as an action item during the shutdown next year; it has been added to the long-term items.
    3. CCAL: no report.
  3. Calibration:
    1. BCAL: Karthik has been training Stjepan (new Regina PhD student on EIC) on the pi0 gain calibration.
    2. FCAL: Igal reported on the FCAL calibration efforts. The FADC range of 2V is too large for many channels. A lengthy discussion ensured, including looking at raw data pulses for saturation, changing the HV from 2V to 1V range, recalibrating more frequently, and using cosmics for gains estimates. As a reminder, calibrations up to ring 22 are good but 23 and 24 are not.
  4. Monitoring
    1. Varun gave a brief update on the BCAL LEDs. Gorups of LEDs that were not firing before have recovered. Mark suggested that this behaviour could be a readout window edge effect. Shift workers could look at the LED raw mode.
    2. BCAL (offline)
      1. Tolga presented follow-up to occupancy monitoring early-late October, looking at plots before the PS screens were installed (Oct 7), between Oct 7-20, and after Oct 20. For PrimEx runs, BCAL was not in the trigger and only the occupancy plots should be looked at.
    3. FCAL (offline)
  5. Reconstruction
    1. Churamani gave an update on "BCAL PHOTON SHOWER" with the tag-and-probe method, using a photon gun and the TRAJ flag (with help from Jon). The drop in the efficiency should be correlated with material due to the chambers inside the BCAL. Jon has a script that could help with this.
  6. Simulations: no report.
  7. Action Items: not reviewed.
  8. Any other business: none.