RC Update and Run Plan for Aug 19, 2020

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RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

Wednesday Aug 17 2020.

General updates

  • Reference cell during SWING (08/18) and into OWL(08/19). Production on polarized He3 at the end of OWL and beginning of DAY (08/19)
  • MCC preformed an energy measurement during DAY, while Hall A was preforming a Moller Measurement
  • Polarization has plateaued around 37%: Recent_NMR
  • Changed polarization direction to 180 degrees: Direction
  • Target swap out scheduled for Friday DAY shift. Brad is coordinating with RADCON to work out the details
  • 1st pass running delayed by one week (08/31)

Pending problem(s) / Things to track

  • Ion chamber trips (without beam). Was fixed during SWING -- https://logbooks.jlab.org/entry/3830236
  • Constantly remind the shift crew to follow the COVID rules and regulations. I have asked each outgoing shift crew to remind the oncoming shift crew.

Recent polarization measurements

  • DAY (08/19) 12:50 - 36.4%
  • OWL (08/19) 01:30 - 36.9%

Current Run Plan

Normal Production running

  • Prerequisites
    • Make sure the raster size is correct (4--4.5mm)
    • 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--4.5mm, 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 at least every 8 hours when running on glass cells. If Hall A hasn't changed in 8 hours, call the RC
  • Run plan
    • Continue taking production data on the polarized Helium-3 target in Longitudinal (180 degrees). If not able to reach requested current, pro-rate the ABUs

When there is a Down

  • If Hall will have opening for 1+ hours, let Simona know as there is work to do on the SOLID cerenkov.
    • Let Simona know when the details of the Friday access are worked out with RADCON.

Notices in Effect for Shift Crew

  • Follow all COVID rules and regulations as well as remind each other.
  • Beam positions: [1]
  • 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[2]


Planned Accelerator Configuration Changes

  • Hall C to 1st pass on 8/31 and back to 5th pass on 9/03


  • Bluejeans remote connection information:
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 Meeting ID : 861439920
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