RC meeting and Run Plan, Tuesday November 1st
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Contents
RC Meeting Information
Time:at 3:30pm today
- Location: Counting house conference room
- Join ZoomGov Meeting
- https://jlab-org.zoomgov.com/j/1619032184?pwd=aWhTVWxya1ZZQzA1K2ZPSTd2ZX...
- Meeting ID: 161 903 2184
- Passcode: 260715
- Dial by your location
- +1 669 254 5252 US (San Jose)
- +1 646 828 7666 US (New York)
- +1 551 285 1373 US
- +1 669 216 1590 US (San Jose)
- 833 568 8864 US Toll-free
- Find your local number: https://jlab-org.zoomgov.com/u/acj3pTicMx
Useful Links
Current Status
Polarized Target
- Current Polarization: N/A
- Requesting hourly screenshots of Target Strip Charts (and keep an eye on these during shift) - Should be removed after configuration change ended
- Experts performing a series of measurements this afternoon and tonight/overnight.
Run Status
- Hall was in controlled access this morning.
- More tests of the new VME crate (BPMs and more)
- Jessie and others did work to prepare for major reconfiguration tomorrow
- Other minor work: over interlock box replaced, pulse generator for GRINCH
Other Topics
- Other Subsystem updates?
Future Plans
- Hall in power permit for magnet-on target measurements. Will go back to CA later this afternoon: current estimate is around 4pm
- Plan on more measurements in power permit overnight, as needed
- Tomorrow morning, move to Restricted Access
- Radcon will come in ~7:30 to bag up contaminated items in target enclosure; prepare for work
- Target group will prepare target enclosure for field measurements and then make the measurements
- During some of this time, the BB/SBS magnets will be ON during the Controlled Access (under special test procedures). Check with RC before going down
- Still to do/schedule:
- Remaining BPM crate replacement work? - Keith
- Any other access needed tonight, tomorrow, or Wednesday?
- MCC will set up separator on Wednesday (for 3-pass delivery)
- Most likely scenario is that we're ready to request beam on Friday; details depend on timing of work in the hall.
- Long term "to do" items; not urgent, some can be done when 3He target not available
- (Luminosity scans with GEMs)
- (Opportunistic BCM calibration (higher current) before pass change?)
- (INFN LV Scan and DAQ Stability - maybe 20-30 minutes if nothing else can run) UPDATE: CAN BE DONE USING THE STAND-ALONE DAQ, SO NO LONGER ON THE OPPORTUNISTIC LIST.
- (Misc. GEM commissioning items: https://sbs.jlab.org/wiki/index.php/CommissioningPlan#BB.2FSBS_GEM_Commissioning_.28Continuation.29)
Current Run Plan
Configuration change.
Need updates for the 'standard' run plan below ------
NMR measurement
Restore beam (standard post-downtime procedure)
Run Plan 1.) He-3 runs, at 45uA of beam current. Use ps3==0, ps5=12, all others -1. Take four runs that should each last for one hour. 2.) Move the target to the pickup coil position, and the TO should run an NMR sweep to measure the polarization. 3.) Return to step 1.)
- Keep an eye out for drifting BPM positions
- Log all DAQ crashes in the excel worksheet along with the reason for the crash
- If beam has been down due to accelerator issues perform a checkout of the beam profile by doing harp scans and check beam centering on target using the Carbon hole target, see Simona's procedure: [1] --> "How To's" --> Beam Recovery Procedure.]
- Cross check the rate with what is expected: [2]
- Cross check with the expected ion chamber readings: [3]
Notices in Effect for Shift Crew
- Power down SBS, BB, and Detector HV before controlled access and allowing RadCon in the hall
- Communicate to the TO that the SBS and BB magnets will be powered down, so they can update the holding field
- See the beam recovery procedures at: HOW_TOs#Beam_Recovery_Procedure
- See the instructions to set the raster at: HOW_TOs#How_to_ask_MCC_to_set_the_desired_raster_size_of_6_mm
Current Issues
- Shift Openings: Monday (morning) OWL, Tuesday OWL and SWING. [4]
