January 26, 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)

  • Zoom remote connection information:
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 Meeting ID: 160 710 0885
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Useful Links

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


  • Data quality checks of SHMS?

Current Run Plan

  • 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

Notices in Effect for Shift Crew

  • Beam current for the Helium targets is limited to 40 uA!
  • Monitor the target temperatures regularly!
  • 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.


Planned Accesses to the Hall

Planned Accelerator Configuration Changes

Special Requests

  • Need to do a BCM calibration at 60uA when Hall A is at low current / down. Coordinating with Hall A RC.