RC Meeting and Run Plan, Sunday, February 9th 2020

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RC Meeting Information

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

Sunday 9th Feb. 2020.

  • Production at 3.4 GeV

General updates

Sunday owl shift was very productive. Good run during the whole day.

Pending problem

Helmoltz coil current drifts, see e.g. here . (Replacement of Kepco PS to be done next Monday, Feb. 10th)

Recent polarization measurements

Current Run Plan

  • Sunday 00:00 → 4:30am continue // production
  • 4:30am NMR, then switch to ⊥
  • 4:30am → 10:30am do ⊥ production
  • 10:30am NMR, then switch to //
  • 10:30am → 15:30 do // production
  • 15:30 NMR
  • 15:30 → 20:30 continue // production
  • 20:30 NMR, then switch to ⊥
  • 20:30 → Monday 2:30am: do ⊥ production
  • Monday 2:30am NMR, then switch to //
  • Monday 2:30am → 8:30am do // production
  • Monday 8:30: Beam is terminated. Ask MCC to send RadCon for full Hall survey
  • Monday 8:30: NMR
  • If beam goes away for more than 2h, or if during the downtime, MCC does operations that may change the beam tuning (except work on transport magnets), the do beam recovery procedure (do YAG viewer part only if your are suspicious of the harp scan results)
  • Always take 120Hz of EDTM

!!                                                     !!
!!  ATTN: SHIFT LEADERS                                !!
!!     Please follow the shift summary template on     !!
!!     the laminated SL instructions.                  !!
!!                                                     !!
!!  ATTN: TARGET OPERATORS                             !!
!!  All NMR measurement HCLOG entries should include:  !!
!!     1) A title that clearly lists polarization      !!
!!     2) Screenshots of both NMR_FieldSweep and       !!
!!        the polarization fit                         !!
!!                                                     !!
!!     For an example see the following entry:         !!
!!     https://logbooks.jlab.org/entry/3768696       !!
!!                                                     !!

  • General idea: take 6 hours transverse data to get polarization up, then 10 hours longitudinal data


  • Replace target cell at some point (Monday Feb. 10th ?)
  • Replacement of Kepco PS to be done at the same time.
  • Replace the 2 old flowmeters for the nitrogen cooling jets lines with 2 new ones (Andy K.)
  • In the same access: Replace the EPR fiber bundle (Jian-Ping)

Hall Access

When there is a down:

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
    • Spectrometer GUI (go_magnets) should always be visible on Shift Leader computer, hcdesk3
    • 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.
    • If SHMS dipole trips again, take a screenshot of the PSU window before resetting the interlock and post it to hclog.
  • 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]
  • Do not change SHMS momentum until we fixed the current lead valve

Planned Accelerator Configuration Changes

  • 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

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