RC Update and Run Plan for Aug 17, 2020

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
  • A wall thickness measurement was performed Wall_thickness
• 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)

Current Run Plan

Normal Production running

• Prerequisites

• Make sure operational restrictions are followed.
• 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.
  • Good examples for entering and leaving laser 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

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