December 1, 2022

RC Meeting Information

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

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Useful Links

• Shift Signup (Read only)
  • Shift Signup

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

Current Status

• Still in Restricted access
• Target Cool down is in process
• Rough estimate ~6 - 8 pm to finish the cool down (but Dave pointed out that this is a very rough estimate)
  • Update, things are going well. Likely closer to 3 or 4 pm!
• Handrails around pivot need to be removed and then spectrometer motion enabled (Thanks Burcu!)
  • Techs can remove the handrail and Steve L. can enable spectrometer motion
  • Spoke with Steve and will keep him updated in regards to the timeline
• Magnet power supplies need to be turned on in the hall
• Target Operational limits need to be updated (Dave Meekins after cool down?)
• Need "guard" for hall sweep when transition to Power/Beam permit

Run Plan

• Move SHMS to 8.00 degrees
• SHMS momentum to -9.2 GeV
• Move HMS to 20.00 degree
• HMS momentum to +3.40 GeV (Positron running)
• Beam and Target Checkout procedure: https://hallcweb.jlab.org/wiki/index.php/Beam_Checkout_Procedures
• Beam checkout
  • Turn on all hodoscope and preshower HV
  • Harp scans --- 5 uA beam, Empty target
• Position checkout
  • 5-10 uA cw with AL hole
  • 2x2 raster

Notes

• SHMS rotation to 8 deg: Rotating SHMS below 8 deg will trip the limit switch. Start with putting 8.1 or 8.2 deg on the rotation GUI to see the angle offset first then correct for it.
• HMS rotation to 20 deg: There is an increased chance that the rotation will get "stuck" and require expert intervention.
  • When rotating to 20 degrees from smaller HMS angle, it is ok to go directly to 20 degrees.
  • When rotating to 20 degrees from larger angle, first rotate to 19 degrees, and then to 20 degrees.
• SHMS DAQ work during the Christmas break by Bob Michaels?

To do

• Begin production data on target ladder 2