RC Meeting and Run Plan, Thurs, January 16th 2020

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RC Meeting Information

RC Daily Meetings are at 4:15 PM, 2nd floor Counting House Meeting Room

  • Bluejeans remote connection information:
 To join the Meeting:
 https://bluejeans.com/861439920
 To join via Room System:
 Video Conferencing System: bjn.vc -or-199.48.152.152
 Meeting ID : 861439920
 To join via phone :
 1)  Dial:
   +1.408.740.7256 (US (San Jose))
   +1.888.240.2560 (US Toll Free))
   +1.408.317.9253 (US (Primary, San Jose))
   (see all numbers - http://bluejeans.com/numbers)
 2)  Enter Conference ID : 861439920

Useful Links

General updates

  • Finished 1 pass at around 3:20am.
  • Target changeover to 5pass.
  • TO class on Thursday in the Hall C counting room from 2:30 pm - 4:00 pm.

Current Run Plan

Wednesday Swing/Owl

  • Beam checkout Short procedure
    • Want beam sigma between 100-300um.
    • Checked with Jay. Promised 250-500um.
  • Glass cell Commissioning (1 hr each on two glass cells):[https://hallcweb.jlab.org/wiki/index.php/5-pass_production_for_A1n#Glass_Cell_Current_Scan.2FCheckout_and_Commissioning Run plan
  • Move SHMS back to 30deg.
  • If target polarization is close to maximum, we go straight to
  • If not, do some "filler" runs. At any point within B3,B4 and B5, if target polarization is high enough, go back to A3) above.
    • B3) Rate study with Ref 3He Cell: 2 hours at high momentum setting, 2 hours at the low momentum setting.Run Plan
    • B4) Cycle the magnet to high momentum setting. If this happens during day/swing, ask MCC to perform an energy measurement;
    • B5) Vent the 3He from Ref Cell, take Empty, H2 and N2 (1-2 hours each), Run Plan


Thursday Day

  • Moller measurement will start around 8am.
    • Start with Moller setup and measurement at present Wien angle (last about 4 hours).
    • Do three Wien angles to help with Hall C systematics and in general understanding of the machine. See Atlis

Special Requests

  • Keep target expert schedule filled out on whiteboard
  • Andy Kenyon has parts ready for the nitrogen for the cooling jets.= Ongoing Work in the Hall
  • Bill Henry wants to removed a power supply from the hall. Need Radcon to survey it.

Notices in Effect for Shift Crew

  • Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled access.
  • Magnet policies
    • HMS Q1 must be ramped down in 50A steps in all cases
    • Do not ramp HMS Q2 to zero, only go to 10A and then switch off power.
  • Inform the RC of any access that the Target Team requires. The RC will coordinate with RadCon to make everything run smoothly.
  • The operators have been somewhat careful with our beam orbit locks. Please make sure that the orbit locks are enabled and the beam does not drift from its nominal position.
  • Ramp rate lock instructions are here and added to checklist[1]
  • Temporary Laser instructions can be found here [2]


Planned Accelerator Configuration Changes