RC Update and Run plan for Sep 17,2020
From HallCWiki
RC Meeting Information
RC Daily Meetings are M-F at 4:15 PM
To join the Meeting: https://bluejeans.com/861439920 To join via phone : +1.408.740.7256 (US (San Jose)), +1.888.240.2560 (US Toll Free))
WThursday 17 Sept 2020.
General updates
(See d2n Run Plan 2020 for broader status/overview.)
- Production running in Kin-C, Kin-Z at transverse/270 (T1 trigger only) resumed around 1pm Wed
- SHMS collimator readback went nuts [1], data look OK though [2]
- Power cycle the controllers in the Hall at next access.
- Laser polarimetry computer (polhe4) crashed around 3am [3], needed some experts to support getting things running again, but didn't impact data taking too much. Documentation is being updated.
- Target polarization holding around 39% [4], [5], [6]
- Lost RF at 11:00am [7]
Notes for the Future
- 1-pass running transition scheduled for 6am Friday, Sept 18
- RadCon will enter at 6am and complete the Hall survey by themselves. Others will enter when that is complete (6:45 or so)
- Unplug raster Coil B [Bill G] (MCC needs to update settings on their end; system needs testing -- Brad)
- Reset collimator controls (Brad)
- Install collimator in target (JP, RadCon)
- Change spectrometer angles (Steve L, Techs will support)
- EPR photodiode will NOT be replaced (Junhao reports it should be OK, can also replace after run) [8]
- Hall A will setup the charge-asym feedback system for us (P. King, et al)
- Charge Feedback Parity DAQ Instructions will need to be followed by Shift Crew -- We will have to run the 'flipper script'
- Bill, Murchhana check compass/field measurements
- Also checking with Jixie re: modeled fields
- Need to make a write-up that clearly defines all the different coordinate systems used, swapped power supply/polarity issues, etc.
- Start prepping for post-run work
- See POST-run Calibrations/Measurements for list
Pending Issues
- Review and do any final prep/planning for 1-pass running
- Paddle optimization for 3He Elastic xsec running [Chao]
- Done. Same paddles as before. A dA/A:2--3% measurement will require ~16 hours
- Junhao has some estimates of the NMR calibration coeffs for 1-pass 0 and 180 settings [9]
- Paddle optimization for 3He Elastic xsec running [Chao]
- Beam energy drifts
- Should confirm that MCC remembers to shift the energy lock to Hall C when Hall A turns off
- Just something to keep an eye on. Has not been a problem lately.
- Hall C 5-pass polarization goes down as energy (HALLC:p) goes up [10]
Opportunistic Jobs/Access
- SHMS collimator readback went nuts [11], data look OK though [12]
- Power cycle the controllers in the Hall at next access.
- Target calibrations / tests (Particularly anything that will be needed at 1-pass!)
- Just before Moller measurement, and/or other known downtimes
- See D2n_Run_Plan_2020#Target_Calibrations_and_Tests
Current Run Plan
Thursday DAY → Thursday SWING
- Continue production data in Kin-C, Kin-Z with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs.
- All runs for Kin-C and Kin-Z settings use the T1 trigger only
Friday OWL
- Continue production data in Kin-C, Kin-Z with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs.
- All runs for Kin-C and Kin-Z settings use the T1 trigger only
- 6 am Friday Morning
- Ensure RadCon is ready to enter Hall
- RadCon will survey Hall and begin transition to Controlled Access
- Stop beam, take NMR/pNMR
- Rotate target to Longitudinal/180, switch on longitudinal lasers
- Continue to pump in longitudinal direction until 6:30pm or so
- Shut off lasers and lock-out fibers
- All personnel (RadCon, Techs, and Target personnel) must attach their LOTO locks
Friday DAY
- (Started at 6am) Open target enclosure
- Install collimators (JP, RadCon)
- Check on EPR photo-diode status, likely replace it? (JP, RadCon)
- Ensure fast raster is reconfigured correctly (Expert: Jones, Gunning)
- Rotate to minimum angles for HMS (11.7) and SHMS (8.5) (S. Lassiter, A. Comer)
- Configure target for Longitudinal/0 or Longitudinal/180 (TBD)
- Close up and wait for MCC to establish (1-pass) beam to the Hall
- NOTE: Hall C is in control of the Charge Asymmetry feedback system until Monday
- Charge Feedback Parity DAQ Instructions
- We will have to run the
./FlipPCvaluesHallC
script in the Parity DAQ VNC session after every IHWP change
Friday SWING → Monday
- See task list at Run Plan for 1-pass for more details
- Initial priority will be PbPt polarization cross check with longitudinal pol. elastics.
- These have lower priority but will likely be pursued while target spins up
- 3He, N2 density measurements
- H2 xsec measurement
- Pressure curves
Standing Orders
- Change the IHWP at least every 8 hours when running on glass cells. Call Halls A and B in advance. If there are any issues, call the RC
- Ensure that all information in the CODA run-start GUIs is correct for every run!
- If beam goes away for more than 3h, or MCC does operations on the beam that may change the beam tune, then move target to No Target position,
- verify Harps scans at 3H07A and 3H07B are within spec, and
- ensure beam is stable (with all locks ON) at 0, 0mm before continuing.
- Beam recovery procedure has more detailed procedure if needed.
- New beam positions have been verified and established to be (0,0) mm for all targets.
- Monitor that beam is at (0,0) using the stripchart on the Wall screen and verify no scraping on the glass cells using the Analysis monitor.
- Check the position locks are on.
- Check that CODA is running normally
- Check online replays shortly after starting runs, & full replay results too.
- Fill BTA with realistic numbers. You may follow the guidance coming from "load from EPICS", if it does not overestimate the ABU (as it generally does). https://logbooks.jlab.org/entry/3783171. If we have to lower the beam current we actually want because the beam is too unstable, prorate the ABUs.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !! !! !! 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 !! !! !! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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
- Follow the updated guidelines in the How-to#Spectrometer_Magnets Spectrometer Magnets How to
- Spectrometer GUI (
go_magnets
) should always be visible on Shift Leader computer, hcdesk3 - If any magnet trips, snapshot the associated power supply window and post it to hclog before resetting the interlock.
- Monitor the beam position on target and call MCC immediately if you see large excursions (1 mm level).
- When rotating the spectrometer, use HCCAM01 to keep an eye on the SOLID Cherenkov test stand when rotating SHMS (in addition to watching the live angle-cam image, etc). The updated rotation instructions are here: https://hallcweb.jlab.org/wiki/index.php/Spectrometer_Rotation#NOTICES_IN_EFFECT
Useful Links
PolHe3 Polarization Measurements