RC Meeting and Run Plan, Tuesday, January 7th 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:
 To join via Room System:
 Video Conferencing System: bjn.vc -or-
 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

Target Readiness

  • Spot size changed and spin up measurements conducted last night. Not much of a difference in terms of the polarization. Still not satisfactory! Perhaps the phase difference isn't calculated correctly? Need additional insights to debug this problem.
  • Raytum people are here and they will look into polishing the transverse laser fiber and also the EPR fiber bundle cable.

Remaining work:

  • NMR legs have been machined and are ready to be installed. 2 BNC cables need to be made and attached to these coils.

Current Run Plan

  • Tuesday: Do polarization measurements in the transverse direction. If there is a difference between transverse and longitudinal measurements, then the compensation lenses might be the issue? If not the laser polarization? Continue brainstorming..
  • Wednesday: Do spin up measurements after the fibers are repaired and installed. Check target ladder alignment.
  • Thursday (?): Close up the enclosure. Start taking 1-pass data for two days with the same settings as in December.

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]

Current Issues

  • Polarimetry debugging in progress

Ongoing Work in the Hall

Planned Accelerator Configuration Changes

Special Requests

  • Keep target expert schedule filled out on whiteboard