RC Meeting and Run Plan, Saturday, February 8th 2020

From HallCWiki
Jump to: navigation, search

RC Meeting Information

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

Saturday 8th Feb. 2020.

  • Production at 3.4 GeV

General updates

Then beam went down around 23:00 and was down for the whole Saturday owl shift and half of the day shift. After that, production was quite good.

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

Beam has been down the whole owl shift due to accelerator IOC problems.

  • When the beam comes back:
  • Run 4h in ⊥
  • NMR, then switch to // production
  • 5h of // production
  • NMR, then continue // production
  • 5h of // production
  • NMR, then switch to ⊥ production
  • 6h of ⊥ production
  • NMR, then switch to // production
  • 5h of // production
  • etc.

  • 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

Useful Links