January 26, 2023

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 remote connection information:

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Useful Links

• Shift Signup (Read only)
  • Shift Signup

• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Current Status

• Finished setting 3 of high Q2 electron data taking in the HMS (-3.09 GeV and 35 deg). Completed swing 1/24/2023
• Helium-3 remains for setting 4 of high Q2 electron data taking in the HMS (-2.72 GeV and 35 deg).

  Carbon took 10 hours beam on time, 24 actual.

  Helium-4 took 11.5 hours beam on time, 17 actual.

  Aluminum stand-in took 4.5 hours beam on time, 6 actual.

  Helium-3 Est to take 27 hrs beam on time, <TBD> actual.

• Target temperature spike for loop 1 AND loop 2:

  https://logbooks.jlab.org/entry/4117272

  Loop 2 had a spike during production running, will need cut out

  https://logbooks.jlab.org/entry/4117306

  • Greg looked into the spikes and found nothing of note. Suggested to continue as planned.

    https://logbooks.jlab.org/entry/4117470

  • Swing into owl target moved to loop 1, no issues.

• MCC currently re-steering the beam. Don't know how long this will take

• Data taking moving forward (2.5 days Hopefully):
  1. Setting 4: 27 hours (when beam returns)
  2. Setting 5: 11 hours including increased time for He3
  3. Setting 6: 6 hours
  4. Setting 7: 4 hours
  5. Setting 8: 3 hours
  6. Setting 9: 3 hours
  7. Setting 10: 3 hours

• Data quality checks of SHMS?

Current Run Plan

• Resume data taking at the setting 2 of high Q2 electron data taking with 3He, Al dummy, and 12C targets.
• 10 different HMS settings in total. Mostly with 3He, 4He, Al dummy, 12C, and 63Cu targets.

Notices in Effect for Shift Crew

• Beam current for the Helium targets is limited to 40 uA!
• Always let the RC know with questions and any issues that require expert help. https://logbooks.jlab.org/entry/4109412

Current Issues

• Accelerator issues to provide high beam current to Hall A and C.
• Lowering the Hall C current to reduce beam trips in a way the split between Hall A and C current is not in equitable way.