RC Update and Run Plan for Aug 12, 2020
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RC Daily Meetings are at 4:15 PM, remote
Wednesday Aug 12 2020.
General updates
- Bill and Murchana doing the Moller measurement https://logbooks.jlab.org/entry/3825625
- Melanie did AFP loss study https://logbooks.jlab.org/entry/3825657
- Preliminary study from Dave Mack on the BCM data seems fine. https://logbooks.jlab.org/entry/3825150
- And and update from Dave this afternoon https://logbooks.jlab.org/entry/3825809
Pending problem
- Beam trip rate
Recent polarization measurements
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
- Start back with the Beam / Raster checkout (short procedure) Checkout
- Production on 3He; if not able to reach requested current, 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)??
- We are on the schedule to switch to 1st pass on Monday/Tuesday (17AUG / 18AUG). Need about ~ 3 days at 1st pass and would like to switch back to 5th pass before the weekend.
- EPR diode good for now, but check for future planned accesses.
- If Hall will have opening for 1+ hours, let Simona know as there is work to do on the cerenkov.
Hall Access
When there is a down:
Notices in Effect for Shift Crew
- Beam positions: [3]
- 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.
- Spectrometer GUI (
- 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[4]
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
