March 16, 2022 Calorimeter

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

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       Meeting ID: 160 855 2106
       Passcode: 944454


  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
  6. BCAL calibration links, 2020, PrimEx, SRC

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. Past Meeting Minutes
  3. Shutdown tasks
    1. Review Action Items
  4. Run Operations
    1. FCAL
    2. BCAL
    3. CCAL
  5. Calibration
    1. BCAL gains for SRC
  6. Monitoring
    1. BCAL (offline)
    2. FCAL (offline) FCAL-LED efficiencies and timing for 2021-08 PrimeX and 2021-11 SRC/CT
    3. CCAL (offline)
  7. Reconstruction
  8. Simulations
  9. Any other business


Attendees: Karthik, Susan, Mark, Tolga, Stjepan, Sean, Elton, Igal, Malte, Eugene, Jon, Zisis

  1. Announcements: none.
  2. Past Meeting Minutes. We reviewed these; the FCAL voltage will be discussed at out next meeting when Matt is present. We might also get an update on the FCAL timing resolution that Rebecca is working on.
  3. Shutdown tasks
    1. CPP: Elton presented a comprehensive summary on the CPP installation progress. All is going well. All MWPCs have been tested and moved from EEL to the Hall and mounted on the forward carriage. Minor issues with the supplier of the cables required (soldering vs crimping of connectors). 6 cables exists that can be used to test each chamber; with 6 chambers, 36 50-ft cables are needed (horizontal chamber connectors are at the side, vertical ones at the top). The MWPCs will use a CDC FADC (corresponding to 1/4 of the CDC). Changes from GlueX standard configuration: i) 3/4 CDC operating (with BCAL to be used to veto charged particles in CPP and to look at photons at large angles BSL from NPP); ii) the tagger microscope is being moved down to 6 GeV, which has software and monitoring implications, as well as coherent peak implications. CPP requests that the FCAL stay the same to avoid introducing any additional changes into the CPP experiment.
    2. Review Action Items: Zisis updated short, long and calorimeter work packages following our discussion two weeks ago.
  4. Run Operations: no other updates
  5. Calibration: Stjepan reported that he has started the pi0 gain calibrations for the first SRC batch (runs 90059-90200) based off the 2020 GlueX gains and the numbers look quite good. He will proceed to the next batches. We also discussed what to do for the PrimEx gain constants. Those looked very similar to the 2020 GlueX ones (a couple of channels had 2-3% deviation, all others within 1%): see BCAL Gains. Karthik reported that the 2021 PrimEx numbers are consistent with the 2019 PrimEx ones. Mark mentioned that he finished the final timing calibration for the BCAL and will move next to the attenuation length and position calibrations; those could affect the gain calibrations. We decided to wait for Mark's numbers and then invite the PrimEx people to come to our CALWG to discuss thesis. It is possible that we might want to run a monitoring launch as a final check.
  6. Monitoring
    1. BCAL (offline): no report.
    2. FCAL (offline): Susan gave a report on FCAL-LED efficiencies and timing for 2021-08 PrimeX and 2021-11 SRC/CT. Slide 2 is on PrimEx and slide 3 on SRC. Upper left plots: horizontal lines correspond to the various LED configurations (colours, voltages). Gaps in this plots may be related to entering the dark room to replace bases, according to Mark; the efficiency numbers form these should be good. This will be verified by looking at the archiver, which could have 3 variables related to this, according to Malte. Lower right plot should be used to check timing once the timing calibration (shifts) have been completed. On slide 2 upper right, there is a horizontal line at 25 on the y-axis; Susan will investigate further. On slide 3 there is a vertical line before run 90600; it might be noise, but we will wait for data monitoring.
    3. CCAL (offline): no report.
  7. Reconstruction: no report.
  8. Simulations: no report.
  9. Any other business: none.