Feb 20, 2020 Calorimeter

Meeting Time: 11:00 a.m.

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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

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 east 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. Check that the 4ns shifts in the BCAL FADCs is absent with the new firmware (Mark) No timing shifts have been seen
2. Complete Calorimeter work packages

Long term items

Tentative Agenda

1. Announcements
   • Announcement at Production and Analysis meeting. Complete calibrations by April 1? See 2020 Data Production
2. Action Items
3. Run Updates
   1. FCAL
   2. BCAL
      • BCAL Voltage Trip (Elton)
      • Temporary Fix
4. Calibrations
   1. BCAL Timing (Mark)
5. Monitoring
   1. Module 26 LED plots (Varun)
6. Reconstruction
   1. Discussion of neutron implementation in halld_recon? For reference, Simon's survey (not using halld_recon)
7. Efficiencies
   1. BCAL simulation efficiency and FCAL+DIRC updates (Jon)
8. Simulations
9. NIM articles
10. Any other business

Minutes

Attending: Elton, Mark, Zisis, Jon, Chandra (JLab); Karthik, Varun (UofR); Sean (FSU); Christina (Athens); Susan (Juelich); Drew (Duke).

1. Announcements
   • Matt is on shift and Colin is RC this week.
   • Announcement at Production and Analysis meeting. Complete calibrations by April 1? See 2020 Data Production
2. Action Items
   • (Mark) BCAL channel timing completed. See below. Differences from previous periods is ~50 ps. Position, Up/Down ratios will be done next week. Karthik should wait till these are complete before beginning the gain calibrations.
3. Run Updates
   1. FCAL
      • (Jon) A few bases have been replaced; overall the rate has slowed. The PDU needs to be replaced. We need to make sure that gets done next week during the down time.
      • Elton shipped back bases to IU and they have been received.
   2. BCAL
      • BCAL Voltage Trip (Elton)
      • Temporary Fix
      • We need to take extra precautions when working around the magnet when the field is on.
      • Karthik should check calibrations before and after the incident to verify that there are no changes.
4. Calibrations
   1. BCAL Timing (Mark)
      • Timing shift from previous periods is ~50 ps. New constants have been loaded into ccdb.
5. Calibrations Spring 2019 (Sean)
   • Sean wanted to assess the status of calibrations for the PRIMEX run period and preparations for a monitoring run. PRIMEX uses the BCAL as a veto.
   • (Mark) 4 ns calibrations on BCAL have been completed for every run in a monitoring launch.
   • (Karthik) The pi0 gains were calibrated for spring 2019 and have been entered into ccdb.
   • email from Sean:

      Hi all,

To look at the output of the monitoring launches, you can go to https://halldweb.jlab.org/data_monitoring/Plot_Browser.html And select (for example) Run Period = "RunPeriod-2019-01", and under Version, one of the choices labeled "Monitoring Launch" The output ROOT files can be found under /work/halld/data_monitoring/RunPeriod-2019-01 You can familiarize yourself with the typical outputs by looking at these, and we can always add additional plugins. It looks like we haven't done a full monitoring launch for the Primex runs, so this will be the first full look at that.

2. Monitoring
   1. Module 26 LED plots (Varun)
      • Checked LED response in module 26 before and after the event. M26 L1 S2 sees a 2% shift, and M26 L1 S3 shows a 5% shift. They see stable before and after the event. Monitoring will continue.
3. Reconstruction
   1. Discussion of neutron implementation in halld_recon? For reference, Simon's survey (not using halld_recon)
4. Efficiencies
   1. BCAL simulation efficiency and FCAL+DIRC updates (Jon)
5. Simulations
6. NIM articles
7. Any other business