November 15, 2023 Calorimeter

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Meeting Day/Time: every 4th WEDNESDAY at 11:00 a.m. JLab time (monthly frequency during the long shutdown)

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  1. FCAL HDFCAL log book
  2. ECAL HDECAL log book
  3. BCAL HDBCAL log book
  4. CCAL HDCCAL log book
  5. Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation
  6. Photon Reconstruction Task Force
  7. 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 resolution between data and simulation as a function of E, phi and theta to within 5%.
  4. Demonstrate agreement of photon reconstruction efficiency 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. Review Action Items
  4. Detectors
    1. FCAL/ECAL
    2. BCAL
  5. Calibration
  6. Monitoring
  7. Reconstruction
  8. Simulations
  9. Any other business


Attendees: Igal, Karthik, Tolga, Sean, Malte, Matt, Ilya, Naomi, Eugene, Jon, Zisis

  1. Announcements: none
  2. Past Meeting Minutes: no updates.
  3. Review Action Items: these were reviewed quickly with more info on the Monitoring recorded below. The items will be overhauled early in 2024 to make sure we know what needs to be done during the shutdown and before beam comes in Sept 2024.
  4. Detectors
    1. FCAL/ECAL: Malte reported that 60-70% of the LV cables for FCAL/LGB are done, which is an easier task in the absence of the dark room and other obstacles. Acrylic panels arrive tomorrow, and while having their protective cover on they will be test-mounted to check their brackets and plan how to install the LED boards. Tests will commence using a few models at a time with a scope. Kevin from IU and Zisis will work on the signal cables. Zisis reported that ECAL work has shifted to documenting info in ccdb and making drawings of the crystal locations, as well as keeping up with voltage divider checks.
    2. BCAL: no report.
  5. Calibration:
    1. Karthik talked about the BCAL non-linear correction, which is a max of 2% between 0.5-1.5 GeV. In 2018 a SiPM saturation was implemented by Elton et al with the hope that it would negate the need for a non-linearity correction, but even after this a 4% non-linearity was left between 2018-2020, but after 2020 this dropped to 2%. Igal sees about the same. There is an anchor point at 11 GeV to avoid overcorrecting at high energies (although it is rare to see energies above 3 GeV).
    2. Sean asked about thew progress of BCAL calibration for 2023 data and if Mark had sent the gain ratios. Igal reported that BCAL calibration for CPP and PrimEx is done, including the 4th layer with cosmics. Igal found for PrimEx that with filled target the calibration of a single run period produced constants that were very stable for the other periods, with only a few issues, and that 1-3 iterations were enough. He expects the GlueX constants will be equally stable.
    3. Igal is looking at the FCAL pedestal stability on a run per run basis, by calculating and comparing against the average per run. These adjustments make an improvement.
    4. Ilya reported on his calibration efforts for CPP. He does not have constants in ccdb yet. He is writing up his method, which works well in the inner region where CPP has stats and in 1-2GeV; above 2 GeV he has 2% nonlinearity. He uses pi0 up to 4GeV and above that omega->pi0g. Igal will use Ilya's method on PrimEx and compare with his (which is based on the original IU method).
  6. Monitoring: the BCAL offline monitoring is being organized between Tolga and Zisis and Zisis will record the knowledge. FCAL used to be done by Susan, but we will check to see who will continue this. Igal needs a script to find the fitted value and look for outliers.
  7. Reconstruction: the next BCAL systematics meeting is planned for Nov 28. Churamani, Karthik and Tolga are working on it and will touch base this Friday on progress.
  8. Simulations: Matt sent a message ot Jon to discuss the missing photon angle resolution.
  9. Any other business:
    1. Zisis mentioned that the baby BCAL which was used for e+ 3-6.2GeV measurements behind the PS in March and then for cosmics in August-Sept, is now at ANL to tests with the silicon AstroPix MAPS position detectors, for the ePIC hybrid barrel imaging calorimeter.
    2. Next CALWG meeting will on Dec 13.