RC Update and Run plan for Aug 30,2020

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RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

General updates

  • Yesterday, production data taking with PolHe3 transverse (HMS is at 20 degrees -4 GeV and SHMS is at 18 degrees -5.6 GeV (Kin C-Z) until 7pm
  • At 7 pm: target rotation to longitudinal 180 deg. Since 8:30pm data taking with PolHe3 longitudinal Kin A/X SHMS -7.5 GeV 11 degrees, HMS -4.2 GeV 13.50 degrees

Recent NMR Measurements

Current Run Plan

  • Keep taking production data with longitudinal Kin A/X SHMS -7.5 GeV 11 degrees, HMS -4.2 GeV 13.50 degrees until tomorrow?
  • Anything target related needs to be done before tomorrow's downtime?

Checklists for Target Specific Work in Hall

List of Tasks for Down Time during Pass Change

  • Simona's SoLID Cherenkov work (Simona needs about 5 minute survey for her work area so she will go down with RadCon first)(Simona, Larry, RadCon)
    • Larry will go in with Simona (and RadCon) to get the lift ready.
  • Collimator installation
    • RadCon --> open 1 or 2 panels for radiation check
    • Techs will install the mounts.
    • JP will install the blocks.
    • Put the panels back (techs will help with this)
  • SHMS rotation to 8.5 degrees / HMS rotation to 11.7 degrees (what is min?)(Steve/Amy) (Simona to monitor SHMS rotation)
  • Purge water from compressor (Larry/Jerry/Stan)
  • EPR photo-diode status, maybe replace it (Junhao)

For 1-pass Running

  • 1-pass changeover planning
  • Beam energy measurement just after pass change is completed (contact PD+crew chief)
  • Ensure fast raster is reconfigured correctly (Expert: Jones, Gunning)
    • "Have MCC click on the button on the Expert page for 1 coil (instead of 2 coils). Ensure "gbeam_pass1_jan2020.param" is used for analysis"
  • No Moeller measurement

Pending problem(s) / Things to track

  • Spare reference cell options/status [Todd, JP]
  • Target mounting for Tommy (next cell) [Arun, et al]
  • Target mounting for Butterball [Arun, et al]

General Reminders for Running

  • 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. Call Hall A in advance to request. If there are any issues, call the RC
  • Note that the autoload of IHWP status in the Start-Run GUI doesn't work anymore so please double check IHWP setting before you accept the GUI value.

Notices in Effect for Shift Crew

  • Follow all COVID rules and regulations as well as remind each other. Additional food guild lines:
    • All food are removed from the round table. Fruit are now store in the fridge, and individually packaged snacks are store on the shelf below the coffee machine.
    • No food near the SL and TO control station. If you would like to eat something, please use the empty round table (used to store food in the past), that is now empty and sanitized.
    • New coffee guide line: it is much preferred if you can bring you mug for the coffee. During the shift if one need to drink coffee near the control station, then the coffee mug must have a lid or have some kind of cover.
  • 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.
  • 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]
  • An new reference Cell refill procedure: New procedure
  • Magnet policies
    • Spectrometer GUI (go_magnets) should always be visible on Shift Leader computer, hcdesk3
    • Slow ramping procedure of the SHMS, go small steps to the MOL, an great example (1 hour 30 min process)
    • 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.
    • New updates to the magnet momentum ramping procedure: https://hallcweb.jlab.org/wiki/index.php/How_to_operate_and_monitor_the_Spectrometer_Magnets
    • 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
  • When rotating the spectrometer, use HCCAM01 to keep an eye on the SOLID Cherenkov test stand when rotating SHMS (in addition to watching the live angle-cam image, etc). The updated rotation instruction can be found: https://hallcweb.jlab.org/wiki/index.php/Spectrometer_Rotation#NOTICES_IN_EFFECT
  • New SHMS matrix element


Planned Accelerator Configuration Changes

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


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