August 2, 2023 Calorimeter

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

Connection instructions

Connect to ZoomGov Meetings

References

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: We will primarily discuss BCAL calibration, particularly using cosmic rays to calibrate layer 4. The recent log entries and writeup by Colleen Henschel might be useful references.
   • https://logbooks.jlab.org/entry/4164597
   • https://logbooks.jlab.org/entry/4164796
   • https://halldweb.jlab.org/doc-private/DocDB/ShowDocument?docid=3849
6. Monitoring
7. Reconstruction
8. Simulations
9. Any other business

Minutes

Attendees: Mark, Malte, Igal, Tegan, Jon, Sean, Matt, Ilya, Zisis

Tentative Agenda

1. Announcements: none.
2. Past Meeting Minutes: nothing to review -- main topic today is CPP calibration for the BCAL.
3. Review Action Items: no review.
4. Detectors
   1. FCAL/ECAL: Malte reported that the PWO stacking has commenced in the hall. Base refurbishment (~40) has picked up speed because two undergrads and the new tech (Dave) are helping Chris. The approach is proactive.
   2. BCAL: no report.
5. Calibration: We discussed BCAL calibration, particularly using cosmic rays to calibrate layer 4; see above references plus GlueX-doc-1784 (light guide sizes and efficiencies). Igal introduced the topic and Tegan explained aspects of report GlueX-doc-3849 (how MC/data ratio is applied). Zisis spoke about Elton's report (1784). Mattt pointed out the effects such as the different aspect ratio of layer 1 to the others might be a factor in the disagreement of L1 to the other layers in the MC (Fig 10, Report 3849 -- Tegan had also considered this at the time). It does not make sense to invest in an effort to study all this with the main GlueX MC (3849 used the standalone, fine grained MC). Igal found that by averaging the L1 and L2 values, this brings L3 nicely into the right spot and in agreement with the GlueX-L3 values. Igal will flatten the distributions in his log entry above, which should improve things. He asked Mark to check the position calibration, which Mark will do by tomorrow. Igal will finish all the work before the Collaboration Meeting and will upload things to GitHub and write a short technical report.
6. Monitoring: no report.
7. Reconstruction: no report.
8. Simulations: no report.
9. Any other business: none.