RC Update and Run Plan for Aug 3, 2020

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RC Meeting Information

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

Monday Aug 3 2020.

  • Hall C in beam permit and ready; some tune beam in the Hall

General updates

  • Beam centering done during owl shift on C-hole and ref cell
  • IC calibrations done on "no target" and C target
  • MCC refused to do an IC on the ref cell with Hall C current ramp protection enable
  • This should not be a problem tonight according to the crew chief
  • Ops now "sees" when 3He target is in beam (Weiwei fixed something)
  • BCM calibration run started this morning but aborted because we couldn't get stable beam
  • We started a Moller at ~10 am as planned but thunderstorms hit Newport News which created RF instabilities
  • An EPR calibration was done before the Moller


Pending problem

  • Beam so-so

Recent polarization measurements

  • 40%

Current Run Plan

Normal Production running

  • Prerequisites
    • Make sure the raster size is correct (4-4.5)
    • Monitor beam parameters/configuration very often and post an entry like this at the beginning of your shift and when run conditions have changed
    • Running on cell targets: raster always ON (4-4.5, size will be determined by the scraping checks), orbit locks ON, current ramp rate 1 muA/sec
    • Always take 120Hz of EDTM
    • Fill the BTA with realistic numbers. If the desired beam current is not delivered prorate your ABUs!
    • Change the IHWP every 4 hours when running on glass cells
  • Run plan
    • Ion chamber calibrations on Reference cell filled with N2 @ 10 Atm (do not exceed a current of 30 muA)
    • BCM calibration (you requested and MCC will follow the procedure) whenever possible
    • Production on 3He


Notes for tomorrow's 7:45 meeting

  • ?

Future

  • After ~ 10 days of running Hall C will go to 1 pass for ~3 days

Hall Access

  • None planned right now

When there is a down:

  • If the down is 2+ hours call Simona: she will check with the RC to see if there is an opportunity for work in the Hall (SoLID Cherenkov parasitic test)

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 any of the Spectrometers magnets trip, take a screenshot of the PSU window and check the hall for smoke or water with the camera 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.
  • 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]

Planned Accelerator Configuration Changes

  • 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

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