RC Update and Run Plan for Aug 17, 2020

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RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

Wednesday Aug 17 2020.

General updates

  • Continuing with production
  • Butterball was delivered yesterday Butter_Ball
  • Keep an eye on the Q1 insulating vacuum. Plan is to leave it be but we need to keep checking. The HI and HIHi limits have been adjusted
  • During OWL, the SL found that the Web monitor was starting to act weird and eventually stopped updating: [http https://logbooks.jlab.org/entry/3828977 web_monitor]
    • We contacted Chao and he was able to restart the server
  • SL also noticed the backlog in offline analysis: Offline_Analysis
  • The online monitor (and maybe the offline analysis) should be looked into
  • IHWP -- Final decision made between spokespersons -- switch on every 8 hours of beam on target
  • RF recovery planned for tomorrow (08/18/). Estimate is 3 hours of recovery and ~1 hour to get get beam back to the Halls. Jay told me it will be a "hard out" around the 3 hour mark.
  • Work in the Hall
    • Simona - TCD
    • Check voltage under full load conditions -- Make sure nothing funny is going on (in a similar manner to what happened Hall A)

  • DAY shift, Target expert will start a temperature study at 90 degrees (Once RF recovery begins).
  • After finishing, will change spin: 90 ->270

Pending problem(s) / Things to track

  • Web monitor. In the event it is not working, please check the data quality using the online analysis script (post link)

Recent polarization measurements

Analysis Update

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. If not able to reach requested current, pro-rate the ABUs
    • The RF recovery will start around 7:45. Once beam has been taken away, Target expert will begin the temperature curve study.
    • Hall will go to controlled access during RF recovery. The plan is for 3 hours of RF recovery

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.

Notices in Effect for Shift Crew

  • 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 8/24 and back to 5th pass on 8/27

  • Bluejeans remote connection information:
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