Nov 11, 2020 Calorimeter

Meeting Day: WEDNESDAY
Meeting Time: 11:00 a.m. JLab time

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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

References

1. FCAL HDFCAL log book
2. BCAL HDBCAL log book
3. Calibrations: 2020 Data Production; RunPeriod-2019-11 Validation; Offline Monitoring Data Validation

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

Tentative Agenda

1. Announcements
2. Run Preparations
   1. FCAL
   2. BCAL
3. PrimEx/CCAL/FCAL-II
4. Calibration
5. Monitoring
   1. BCAL LED
   2. BCAL (offline)
   3. FCAL (offline) method for bad channels map GlueX data
6. Efficiency
7. Reconstruction
   1. Single block showers for muons (Elton)
8. Simulations
9. Action Items
10. Any other business

Minutes

Attending: Varun, Karthik, Igal, Zisis, Colin, Elton, Christina, Mark, Sasha, Sean, Matt, Rebecca, Jon, Chandra, Malte, Tolga, Susan

1. Announcements
   • This is the first joint CALWG/PrimEx calorimeter meeting. We will have these once a month.
2. Run Preparations
   1. FCAL: Mark reported that 80 bases have been removed. Using a 60Co source from RadCon (strongest one that can be loaned to the Hall) trying to fry the microcontroller; so far no failure. Ben Raydo has a watchdog timer on the microcontroller but needs tp crash the base to test it. Need to check the CAN interface communication on base: this is a good diagnostic to look at. Colin mentioned that it could be a firmware issue. Jon added that each base can be tested one at a time, which takes 80-100 hours. It is likely not an RF issue in the hall; we have no evidence that this a good candidate. Matt reminded us that we are using flat ribbon cables; when we have beam we can test beam on/off and carry out a Fourier transform. Mark said that radiation damage is a long short, and anyhow that cannot be tested using a 60 Co source. Sasha mentioned that power cycling recovers from the issue; perhaps it bit errors are responsible. More discussion will occur offline and at Friday's PrimEx meeting.
   2. BCAL
3. PrimEx/CCAL/FCAL-II
4. Calibration
5. Monitoring
   1. BCAL LED
   2. BCAL (offline)
   3. FCAL (offline) method for bad channels map GlueX data
6. Efficiency
7. Reconstruction
   1. Single block showers for muons (Elton)
8. Simulations
9. Action Items:
   • No specific updates to the Short-, Long-Term or Work packages. Elton requested that we add a detailed study of the fiducial volume around the beam hole. Rebecca is looking at the efficiency at small angles. Check 2017 data first; tine MC to get better agreement with data for 2018.
10. Any other business