RC Update and Run Plan for Aug 24, 2020
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RC Daily Meetings are at 4:15 PM, remote
General updates
- Target installation successful
- Target close up at 4pm (now)
- Hall Lock up for beam 6pm-7pm.
- Current situation
- Target required further calibration
- Reference cell filled with N2 at 110 Psi
- NMR at 10pm
- HMS is at 13.5 degrees -4.5 GeV and SHMS is at 11 degrees -7.5 GeV
Pending problem(s) / Things to track
- Target IOC reboot. William pushed new code changes into the target control to help with the target vibration effect will take place after IOC reboot. (Done at Aug 24, 1:30pm)
Recent polarization measurements
- Day (08/24) 14:00 - 8.5% (Relative measurement without real calibration constants)
- Day (08/24) 15:47 - 15.9% (Relative measurement without real calibration constants)
Current Run Plan
Normal Production running
- Prerequisites
- 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
- Accelerator down time due to fixing 1L13-7.
- The Moller measurement will follow 1L13-7 down time.
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.
- Spectrometer GUI (
- New SHMS matrix element
Planned Accelerator Configuration Changes
- Hall C to 1st pass on 8/31 and back to 5th pass on 9/03
- 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
