RC Meeting, Saturday, Dec 18, 2021
Contents
RC Meeting Information
RC Daily Meetings are at 10 AM, remote
- 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
- Fall 2021 Shift Schedule
- PionLT Physics Status
- PionLT Runplans
- Hall-C Controls
- Hall-C Logbook
- MCC White Board
- Note: 7:45, 8 am and 1:30 scheduling meetings have switched to Zoom
Current Status
Current RC: Dave Gaskell
- Taking data for LD2, pi+ Q2 =6.00 GeV2, W=2.40 GeV, x=0.55, low epsilon, left.
- Pions so far = 1355 (as of 8 am)
- FADC mode 10 run, 3/4 run done
- Completed LD2 pi+ Q2 =6.00 GeV2, W=2.40 GeV, x=0.55, low epsilon, center at 5:30 am this morning. Total pions = 19,296 (from runsheets)
- Switched to SHMS left (13.12 degrees).
- Still running about 8.5 hours behind (about half the built-in contingency)
- Lost 3 hours last night due to 0L04 issues - hard cutoff at 5:30 prevented losing more contingency.
Future plans
- Continue production data at 70 uA on LD2 (SHMS left).
- Change to dummy late owl, early day tomorrow (Sunday)
- BCM calibration - Monday afternonn (2-2:30 pm)
- Checked with Steve about moving to 6.16 degrees on Dec 20th. This can be done with remote oversight.
- Need to be sure that the Gui angle is modified to agree with the true angle when at 8.16 deg.
Current Run Plan
We are currently on (Ebeam=8.0 GeV) Q2=6.00, W=2.40, x=0.55, low ε data taking – PART TWO [See run plan]
- Target: LD2
- Q2=6.00 GeV2, W=2.40 GeV, x=0.55, low epsilon,
- HMS angle=34.58deg, HMS momentum = -2.139 GeV/c
- SHMS angle= 13.12deg (left), SHMS momentum= 5.512 GeV/c
Notices in Effect for Shift Crew
- The Raster Coil pair Ax and Ay are off.
Raster needs to be at 4x4.Raster gui has been updated - can now request 2x2. - With LHe alarms it is good to check the cameras for plumes. If no plume and it is below the LO alarm and above LOLO then monitor with a plot and halog the problem.
- With LNitrogen alarms are not that critical. Just need to start monitoring the problem with plot and Halog.
Current Issues
- Vertical beam position on target has changed a little - will ask Dave Meekins to adjust target ladder positions when beam returns in January.
- There is a rotation issue that has come up if moving HMS between 19 to 25 degrees. It usually gets stuck around this range, please be wary of this issue. We will likely skip settings in this range if this drive controller error cannot be solved. For singles it will not be a big deal to skip settings for HMS at those angles. We need a longer access to address this issue.
- SHMS cannot be rotated to angles > 30 degrees - the proximity switch has either moved or was accidentally set in the wrong place. Not an issue for now - will be addressed before we restart in January,
- The Raster Coil pair Ax and Ay are off
- Diffuser limit at 46uA (Note: is this still valid?)
Crew Chiefs,
We have permission to raise the Hall C diffuser raster limit to allow running >46uA to Hall C. This limit is normally imposed when one of the two rasters is not operative. Since the hall was able to double the running raster current to get the same size raster on the target as having both rasters, Keith is allowing us to raise the limit.
To get to the setting, open the Hall C diffuser interlocks screen. Go to the bottom right corner and open the Expert screen. Just below and to the right of the FSD bits, raise the "Raster 1 OK Limit" to slightly above the highest current the hall wants to run at. Do not change the Raster 2 limit. Make a log entry with screen shots. Make an ABIL entry, System MPS and an expected removal date of 3 Jan. 2022.
Paul
Planned Accesses to the Hall
- None
Planned Accelerator Configuration Changes
- None
Special Requests
- None
