RC Update and Run Plan for July 31, 2020

From HallCWiki
Jump to navigationJump to search

RC Meeting Information

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

Friday July 31 2020.

  • Hall C in Controlled access since yesterday (at some point in Power Permit for PSS re-cert: all people must be out of the hall for that)

General updates

  • Beam to Hall C delayed due to BSY3C PS issues
  • Today's shifts and owl tomorrow are cancelled; as of now Jay's crystal ball says tune beam in Hall C sometime tomorrow during day shift
  • Camille authorized up to 45 muA CW to Hall C until Sep 7
  • The Hall is ready; I checked on the downstream beamline pump this morning, it looked good.

Pending problem

  • Accelerator: BSY3C arc power supply

Progress as of late last night Work towards replacing the PS New PS certification

Recent polarization measurements

  • ?

Current Run Plan

First beam into the Hall

  • Tune beam is allowed; make sure the target ladder is in "no target" position - MCC should notify the RC one hour prior to tune beam arrival in Hall C
  • Before allowing any CW into Hall C we have to go through the beam centering procedure to establish optimal beam positions for the 3He cell and for the Reference cell to make sure there is no beam strike in the target region - expert driven (Hall C RC will call Brad when we are at that step)
  • After the optimal beam positions are established MCC will take over the program to certify the machine tune; the target ladder must be in the "no target position" and the position lock must be engaged. The TO/SL must monitor that the beam positions stay at nominal values. We expect 30-40 muA to the dump as part of the "machine tune certification" exercise
  • Once MCC will be ready to send Physics beam follow the plan outlined under Normal Production running :

Normal Production running

  • Prerequisites
    • Make sure the raster size is correct (100-500 mum)
    • 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!
  • Run plan
    If Physics beam is first time delivered during Swing or Owl:
    • Check that the beam profile (most recent harp scans) and beam positions (orbit lock on) are O.K.; make sure the Hall C current ramp protection is enabled.
    • Ion chamber calibrations on Reference cell filled with N2 @ 10 Atm (do not exceed a current of 30 muA)
    • Ion chamber calibrations on Carbon Optics
    • BCM calibration (you requested and MCC will follow the procedure)
    • If there is still time before 8:00 am do production on 3He
    If Physics beam is first time delivered during day shift:
    • Dave G. will do a Moller measurement

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

Retrieved from "https://hallcweb-2024.jlab.org/wiki/index.php?title=RC_Update_and_Run_Plan_for_July_31,_2020&oldid=15510"