February 24, 2024

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RC Meeting Information

RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting house meeting room (2nd floor)

Useful Links

Hall status

  • NPS work completed and closed the hall around noon
  • Sweeper and corrector setting done
  • Luminosity/background scans
    • Rate screenshots collected in Hao’s day shift summary: https://logbooks.jlab.org/entry/4255780
    • Found that the inner columns have high anode current
    • Final production settings: HV off for column 0 and 1, maximum currents 5uA for LH2 and 3uA for LD2
  • NPS crate #2 drops occasionally:
    • Ben updated the VTP driver: https://logbooks.jlab.org/entry/4255601
    • Suggested that starting a new run would be sufficient, and no need to power cycle the crates
    • If the crate fails, take snapshots of ROC windows and make hclog entry, tag Ben
    • We are taking 30min runs for production instead of 1h

Items to discuss from Charles:

1) How to normalize data if BCM has a large systematic at low current?

  • BCM calibrations on Monday?
    • BCM calibrations including faraday cup measurements on Monday. Most part of our BCM calibrations is non-invasive, except the faraday cup measurements which will block the beam delivery to all halls. MCC and Hall B agreed to support the measurments, and we will coordinate in more details on Monday morning.
  • Perhaps take short runs with calo HV off and current ~20 uA to normalize DIS singles. This would require equal time to restabilize Calo temps.

2) Could we run at higher pmt anode currents (e.g. factor of 2)?

3) At present levels, or x2 higher, what is impact of background pileup on cluster energy resolution?

  • Could anyone do a quick analysis of pi0 mass resolution from the data we are taking tonight?
  • I posted a suggestion for analyzing a possible elastic electron peak in the calorimeter in random coincidence with the hTRIG4 events in HMS https://logbooks.jlab.org/entry/4255894

4) Cancel Deuterium running at this setting?

Accelerator status

  • Overall quiet shift overnight, got up to 5uA for LH2 and 3uA for LD2
  • Maintenance + Beam study next Wednesday

Current Run Plan

Notices in Effect for Shift Crew

Current Issues

  • NPS crate #2 drops occasionally
  • Production current limited to 3uA due to high anode current in NPS calo

Planned Access to the Hall

Special Requests

  • Guard house work from next Monday. Pay attention to the sign and follow the directions around there when coming to the accelerator site.
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