February 24, 2024

RC Meeting Information

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

• Zoom connection link: https://jlab-org.zoomgov.com/j/1617015555?pwd=L09IQ216dml6ZmM5ODExVjFsMX
• Meeting ID: 161 701 5555
• Passcode: 288953

Useful Links

• Shift Signup (Read only)
  • Shift Signup

• Hall-C Controls
• Hall-C Logbook
• MCC White Board
• Daily RC Reports

Hall status

• NPS work completed and closed the hall around noon
  • Trouble shooting a few channels on Friday morning: https://logbooks.jlab.org/entry/4255630
• 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?
• 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)?

• I posted some info on R4125 life time to hclog

https://logbooks.jlab.org/entry/4255889

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

Accelerator status

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

Current Run Plan

• Short-term run plan: https://hallcweb.jlab.org/wiki/index.php/Short_Term_Run-Plan
  • KinC_x36_6

Notices in Effect for Shift Crew

• IHWP change instruction: https://hallcweb.jlab.org/wiki/index.php/Hall_C_IHWP_Change_Procedure

Current Issues

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

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.