December 14, 2023

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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


Current Run Plan

Notices in Effect for Shift Crew

  • All shifts should come in as planned.
    • cc Heidi & Steve Lassiter on any cryo logbook entry (fansler@jlab.org, lassiter@jlab.org)
  • Physically verify green led of gas flow and BCM temps in electronics room
  • Record HMS (electron) tracking efficiency from each 50K replay report

Current Issues

  • No beam because of cryo issue - should come back mid day shift
  • On call list seems incomplete and should be addressed by the Hall: https://logbooks.jlab.org/entry/4230495
  • We need other indications of this interlock. In Hall A, we have it shut off detector HV via the alarm handler, and we have a flow rate alarm. Seems the useful PV values have not been working since 1-Sept.
  • Need alarm on NPS Sweep (or improved visual display of status).
  • NPS PMT/Base failures are propagating into columns 12, 13

Planned Access to the Hall

Planned Accelerator Configuration Changes

  • We will run until 07:00 Dec 15.
    • Target will be warmed up and parked.
    • Hall will remain in Controlled Access until 07:00 Dec 19
    • Beam studies (Day Shift) Dec 19 will send beam into hall
    • Hall will return to Controlled Access at 16:00 on Dec 19

Special Requests

  1. Shutdown repair plan
    1. Remove columns 0-19, start restoration at column 19
      1. Best option for radiation damage.
      2. Either extend shutdown beyond Jan 20 to restore all columns
      3. Or: only restore colulmns 4-19
  • NPS Shutdown Checklist for Dec 22-Jan 2 SAD?
    • Turn off HMS magnets (Dec 15)
    • Turn off HMS detector HV (Dec 15)
    • Dec 22
      • Turn off NPS HV
      • Turn off NPS LV
      • Turn off NPS Chiller
      • Turn off VLD (LED controller)