RC Meeting and Run Plan, Saturday, February 8th 2020
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RC Daily Meetings are at 4:15 PM, 2nd floor Counting House Meeting Room
Saturday 8th Feb. 2020.
- Production at 3.4 GeV
General updates
Then beam went down around 23:00 and was down for the whole Saturday owl shift and half of the day shift. After that, production was quite good.
- run plan Monday-day shift → Wednesday owl for when the beam will not be longitudinally polarized.
- Plan for the Dutch → Big Brother target change Monday.
Pending problem
Helmoltz coil current drifts, see e.g. here . (Replacement of Kepco PS to be done next Monday, Feb. 10th)
Recent polarization measurements
- Fri., 02/07/2020 - 09:09: 62.2% polarization
- Fri., 02/07/2020 - 14:30: 64% polarization
- Fri., 02/07/2020 - 20:33: 54.7% polarization
- Saturday, 02/08/2020 - 01:10: 51.6% polarization
- Saturday, 02/08/2020 - 13:20: 63.2% polarization
- Saturday, 02/08/2020 - 18:13: 65.1% polarization
Current Run Plan
Beam has been down the whole owl shift due to accelerator IOC problems.
- When the beam comes back:
- Do beam recovery procedure (do YAG viewer part only if your are suspicious of the harp scan results)
- Do NMR
- Run 4h in ⊥
- NMR, then switch to // production
- 5h of // production
- NMR, then continue // production
- 5h of // production
- NMR, then switch to ⊥ production
- 6h of ⊥ production
- NMR, then switch to // production
- 5h of // production
- etc.
- Always take 120Hz of EDTM
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !! !! !! ATTN: SHIFT LEADERS !! !! Please follow the shift summary template on !! !! the laminated SL instructions. !! !! !! !! ATTN: TARGET OPERATORS !! !! All NMR measurement HCLOG entries should include: !! !! 1) A title that clearly lists polarization !! !! 2) Screenshots of both NMR_FieldSweep and !! !! the polarization fit !! !! !! !! For an example see the following entry: !! !! https://logbooks.jlab.org/entry/3768696 !! !! !! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
- General idea: take 6 hours transverse data to get polarization up, then 10 hours longitudinal data
Future
- Replace target cell at some point (Monday Feb. 10th ?)
- Replacement of Kepco PS to be done at the same time.
- Replace the 2 old flowmeters for the nitrogen cooling jets lines with 2 new ones (Andy K.)
- In the same access: Replace the EPR fiber bundle (Jian-Ping)
Hall Access
When there is a down:
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 SHMS dipole trips again, take a screenshot of the PSU window 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.
- The operators have been somewhat careful with our beam orbit locks. 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]
- Temporary Laser instructions can be found here [2]
- Do not change SHMS momentum until we fixed the current lead valve
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
