RC meeting and Run Plan, Monday Oct. 15
From HallCWiki
Contents
Status
- Beam quality: noon update Bottom line:
- Once MCC realized they couldn't deliver 37uA, we ran smoothly on 35uA
- We are down for beam studies to increase current to the Hall (ETA until swing)
- Hopefully will have more current available afterwards...
- Expected to be down again tomorrow for RF recovery
- Progress
Issues: Resolved
- HMS dipole and Q3 lost current during swing
- Correlated with peaks on the warm water return
- Happened when Hall A were heating up their target --> probably the root cause
- Were down for 80 minutes
- HMS Dipole LN2 fill level very high
- Added during RC meeting and Run Plan, Thursday Oct. 11
- Seems like JT-4 is unstuck again, maybe related to magnet issues from last night? LN2 levels are stabilizing in the normal range.
- Andy Keyton will attempt quick 5-10 minute fix tomorrow during RF recovery to prevent this from happening again. (He'll replace the motor).
Issues: Requiring attention
Ongoing
- SHMS at small angle
- (Might) need new limits on diffusor ion chamber if we run above >=50uA (Jay Benesh confirmed might be the case), more info here.
- Added during RC meeting and Run Plan, Thursday Oct. 11
- MCC aware of issue, might still come up during luminosity scan
- Be wary of DC trips!
- Added during RC meeting and Run Plan, Friday Oct. 12
- During luminosity scan, SHMS DCs might trip at higher currents (1MHz+ singles rate)
- If we can really reach high current --> be ready to disable SHMS DCs when rates get too high (still want HMS data at those currents).
- (Might) need new limits on diffusor ion chamber if we run above >=50uA (Jay Benesh confirmed might be the case), more info here.
Activities during RF Recovery
- Controlled access tentatively at first opportunity after 9:00am
- Brad: Install NDX detector in SHMS hut (<1hour)
- Andy: Replace motor for HMS dipole JT-4 (<10min)
- Anything else pressing?
Request (non-urgent)
- Hall D needs opportunistic 1shift of HallC down for beam studies, not pressing right now (needs to be done before end-of-run)
- Told them this might be possible when swapping out aerogel trays for the next experiment.
- Next RC is aware.
Plans - Physics
- Conduct for 1-2 shifts for luminosity scan starting this swing shift
- Tentative run plan
- Ryan agreed to help as third during swing, and Richard will help as third during owl if needed
- Expect another downtime tomorrow during day for RF recovery
- Run 2-3 more shifts with Q2=5.5. W=3.02 x=0.40 theta_Shms=6.49 (real shifts, excluding scheduled downtime)
- Currently collected 23% of statistics + Al data in 3 shifts
- Switch sometime between Tuesday and Wednesday to the next point