RC meeting and Run Plan, Monday Oct. 23, 2023
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RC Meeting Information
Time: Monday - Friday at 3:30pm
- Location: Counting house conference room
- ZoomGov Meeting Connection Information
https://sbs.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=431
Useful Links
Procedures
Hall A call-in instructions:
- Call RC first.
- Techs on site 7am-4:30pm Mon-Thu, 7-11am Fri. RC will call Hall A work coordinator (Zach) during normal working hours. After hours, RC calls Tech on-call.
- After 9pm everything non-emergency needs to be deferred. What is emergency and what's not? Call RC. RC talks with Mark to decide.
Hall Access procedure:
- Access check list (binder on the counting room desk) needs to be filled out before making an access.
- Scan (take pictures with phone) and post it to the logbook.
- Any work inside the SBS, BB boundary need to have PS locked out -- requires two QEWs to throw the big switch. Exception: field measurements.
New instruction for shift crew when changing target:
- Beam restoration instructions have been updated. Printed version is in the counting room.
- When we change target, make sure the SOFs of Target BPMs are set to the correct values.
- SOFs for different targets: Needs an update after restoring beam tonight (Note: SOFs for major target positions are on the Control Room whiteboard.)
Status Update
Overall Summary
General
- Weekend was very productive running, accumulated ~7.4 C of corrected charge since last RC meeting
- Struggled with bleedthrough when Hall C went to 30 uA over the weekend - unresolved
- Struggled with GEM trips because correlating with increased IC rates
- MCC thinks this is due to orbit locks
- Sounds like some work in planed for the maintenance day
- MCC working on stop gap measures for the next 2 days
- Sieve slit was inserted this morning around 8:40 for Optics data taking during beam studies
- Running at 45 uA we saw ~2.6 kHz with a BBCal threshold of about 1.7 GeV
- Plans for target laser work?
- Getting encouragement from Doug to run at 50 uA
Shift Plan
- Production Data
Beam
- Up time has been very good this weekend
Opportunistically between spin ups (?):
- H2 Reference data
Accelerator status
- Maintenace Day Wednesday 10/25
- If you want to get into the hall, please communicate with the RC to get this organized!
Data collected :
3 C of corrected charge collected between 7 am yesterday and today
Hall A Subsystems Status
Target
- Some failed fits on a 2 or 3 NMRs over the weekend
- Polarization staying pretty stable around 46-47 % while in beam
Detectors
- HCal (Jiwan Poudel)
- TDC Still looks good
- Bigbite (Arun Tadepalli)
- Mostly good (Provakar)
- SC 18-19 missing
- PreShower R-24 having issues, out of acceptance, will look at on maintenance day
- DAQ (Alex Camsonne)
- GEMs (Holly Szumila-Vance)
- Mostly good (Andrew)
- SBS Layer 2 hole
- SBS LV hardware issue
- Grinch
- Rates too high?
- Hodoscopes (Rachel Montgomery):
- Looks fine (Gary)
Magnets
- SBS and BB are on.
Hall access requests
If anyone wants to make an access, let the RC know!
Shift schedule
IMMINENT OPEN SHIFTS
- None
Please check when your shifts are!
https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=SBS-GEn-2022
Please sign up for any open shifts!
Running Plan
- Standard production running at 45uA, with NMRs every 3 hours.
==> List of items in case He3 production running isn’t ready:
- Take data on reference cell at 10 atm H2 [85% (4200 elastic events) more data required for Bigbite momentum calibration]
- BigBite/single foil location reconstruction (~20 mins?) - BigBite + HCAL detector experts on call consulting analysis experts like Andrew/Sean (magnet on) (? is this different than the optics runs?)
