Difference between revisions of "RC Meeting, Saturday, Dec 12, 2021"
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Current RC: Salina Ali | Current RC: Salina Ali | ||
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| − | * | + | * Continuing lumi scans. EDTM |
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| + | Owl Shift: | ||
| + | * Done with heep singles, move on to luminosity scans. Then EDTM, and changing polarity. | ||
= Future plans = | = Future plans = | ||
* After HEEP singles, do luminosity scans, and then EDTM run | * After HEEP singles, do luminosity scans, and then EDTM run | ||
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= Current Run Plan = | = Current Run Plan = | ||
| − | We are currently on 8.0 GeV Part | + | We are currently on 8.0 GeV Part 2 [[https://redmine.jlab.org/projects/hall-c/wiki/2021_Run_Plans_and_Run_Sheets See run plan]] |
| − | * | + | * Heep Singles is done, currently on luminosity scans. Most of day shift will be lumi scans. |
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= Notices in Effect for Shift Crew = | = Notices in Effect for Shift Crew = | ||
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= Current Issues = | = Current Issues = | ||
| − | * William Gunning | + | * All raster coil pairs were turned on, and 2x2 raster is OK. William Gunning has fixed the issue |
* 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. | * 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. | ||
| − | * UPDATE | + | * UPDATE on target pressure issue: [https://logbooks.jlab.org/entry/3960934 Target pressure issue has been fixed] |
** Old: target pressure for loop 2, LH2, is lower than usual - around 17-18 psi. The alarm went off early in the day shift which brought it to the target operator's attention (Bill Henry). Usually acceptable pressure is around 22 psi. If this drops to atmospheric pressure, 14.7 psi, then we have a problem. The pressure for LH2 was around this range 17-18 psi during LD2 runs as well. We did contact target expert JP to resolve issue but it is currently ongoing and UNRESOLVED. We assume we can continue to take data. Most likely this would involve an access to the hall. [https://logbooks.jlab.org/entry/3960888 See log entry from Greg Smith for an update on this issue (12:15 PM 12/11/21)] | ** Old: target pressure for loop 2, LH2, is lower than usual - around 17-18 psi. The alarm went off early in the day shift which brought it to the target operator's attention (Bill Henry). Usually acceptable pressure is around 22 psi. If this drops to atmospheric pressure, 14.7 psi, then we have a problem. The pressure for LH2 was around this range 17-18 psi during LD2 runs as well. We did contact target expert JP to resolve issue but it is currently ongoing and UNRESOLVED. We assume we can continue to take data. Most likely this would involve an access to the hall. [https://logbooks.jlab.org/entry/3960888 See log entry from Greg Smith for an update on this issue (12:15 PM 12/11/21)] | ||
Revision as of 09:50, 12 December 2021
Contents
RC Meeting Information
Have RC meeting today
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
- OPS 7:45 RC meeting bluejeans link, weekends usually 9am.
- OPS daily 8:00 meeting and Wed 1:30 bluejeans link
Current Status
Current RC: Salina Ali
Day shift:
- Continuing lumi scans. EDTM
Owl Shift:
- Done with heep singles, move on to luminosity scans. Then EDTM, and changing polarity.
Future plans
- After HEEP singles, do luminosity scans, and then EDTM run
- Photo cathode forecast
- Steve Lassiter confirmed that moving to larger angles on Saturday does NOT require remote oversight from Amy or him.
- Check 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.
- Tues Dec 14th, there is a possible OPS test plan for 9-1 and Hall access.
Current Run Plan
We are currently on 8.0 GeV Part 2 [See run plan]
- Heep Singles is done, currently on luminosity scans. Most of day shift will be lumi scans.
Notices in Effect for Shift Crew
- The Raster Coil pair Ax and Ay are off. Raster needs to be at 4x4.
- 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
- All raster coil pairs were turned on, and 2x2 raster is OK. William Gunning has fixed the issue
- 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.
- UPDATE on target pressure issue: Target pressure issue has been fixed
- Old: target pressure for loop 2, LH2, is lower than usual - around 17-18 psi. The alarm went off early in the day shift which brought it to the target operator's attention (Bill Henry). Usually acceptable pressure is around 22 psi. If this drops to atmospheric pressure, 14.7 psi, then we have a problem. The pressure for LH2 was around this range 17-18 psi during LD2 runs as well. We did contact target expert JP to resolve issue but it is currently ongoing and UNRESOLVED. We assume we can continue to take data. Most likely this would involve an access to the hall. See log entry from Greg Smith for an update on this issue (12:15 PM 12/11/21)
- The Raster Coil pair Ax and Ay are off
- Diffuser limit at 46uA
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
- Maintenance to pump down HMS transfer line.
- Need to clean the SHMS encoder wheel
Planned Accelerator Configuration Changes
- none
Special Requests
- none
