RC Meeting and Run Plan, Wed, January 15th 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

  • Got beam back at ~2:30 PM. We will continue to take longitudinal asymmetries data. Coordinated with several groups to expect early morning work.
  • TO class on Thursday in the Hall C counting room from 2:30 pm - 4:00 pm.

Current Run Plan

  • Tuesday: 1-pass data with longitudinal asymmetries (https://hallcweb.jlab.org/wiki/index.php/1-pass_calibration_for_A1n_(Jan_2020) ).
  • Wednesday: Finish taking asymmetries data. Open the target enclosure, remove collimators, do a local EPR and close the panels. Transition to 5-pass. The run plan is here: (https://hallcweb.jlab.org/wiki/index.php/5-pass_production_for_A1n ).
    • Beam checkout
    • Rate study with Ref 3He Cell: 2 hours at high momentum setting, 2 hours at the low momentum setting.
    • Can do beam energy measurement, meanwhile we cycle the magnet to high momentum setting
    • Either: Vent the 3He from Ref Cell, take Empty, H2 and N2 (1-2 hours each) OR Polarized 3He longitudinal production, until Moller measurement Thursday Day.
  • Thursday: TO class + Moller measurement.

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]

Ongoing Work in the Hall

Planned Accelerator Configuration Changes

Special Requests

  • Keep target expert schedule filled out on whiteboard