Revision as of 14:41, 10 August 2020

RC Meeting Information

RC Daily Meetings are at 4:15 PM, remote

Monday Aug 10 2020.

General updates

• Finally got beam at the end of swing. Able to do beam checkout. Very trippy.
• Requested 27 uA of beam through the night and made changes as required to improve stability.
• Beam seemed to improve on day shift.
• Hall D had a down, so we took BCM calibration. Highest current 34 uA.

Pending problem

• HMS changed yesterday only in epics readback from 20.0 to 20.03-- maybe due to earthquake? [1]

Recent polarization measurements

• 42.8% at 3:15pm [2]

Current Run Plan

Normal Production running

• Prerequisites

• Make sure operational restrictions are followed.
• Make sure the raster size is correct (4-4.5)
• 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!
• Change the IHWP every 4 hours when running on glass cells

• Run plan

• Production on 3He; if not able to reach requested current (27 uA), pro-rate the ABUs

Notes for tomorrow's 7:45 meeting

Future

• Opportunistic target polarization calibration and studies on Tuesday-Wednesday during beam off and Moller measurement (priority is beam)??
• Moller measurement on Wednesday
• Plan for BCM calibration when C has priority. Need two more cycles (disruptive to D due to shared slit).
• After ~ 10 days of running Hall C will go to 1 pass for ~3 days

Hall Access

• Plan for Tuesday--Controlled Access:
  • Beam ends.
  • Target to change spin polarization (270->90). EPR calibration. Junhao to check if EPR photodiode ok.
  • RADCON sweeps Hall at 8am. Steve L enables rotation and enters with Radcon to rotate HMS from 20 to 29 deg.
  • Simona, Walter and techs to enter Hall for SoLID cerenkov and HMS Q1 vacuum check. Anticipated 4-5 hours of work.
  • Steve L. will remotely update the software on HMS dipole to decrease interlock due to false spike in current lead mass flow [3].

When there is a down:

Notices in Effect for Shift Crew

• Beam positions: [4]
• 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[5]

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

• Main Pol He-3 wiki
• Shift Schedule
• Hall-C Controls
• Hall-C Logbook
• MCC White Board