Difference between revisions of "Run Planning Meeting Notes, October 21 - October 27, 2021"
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<-- [https://halldweb.jlab.org/wiki/index.php/Run_Coordination_Meetings:Summer2021 Summer 2021 RC meetings] [https://cebaf.jlab.org/files/ops/accboard/ MCC whiteboard] | <-- [https://halldweb.jlab.org/wiki/index.php/Run_Coordination_Meetings:Summer2021 Summer 2021 RC meetings] [https://cebaf.jlab.org/files/ops/accboard/ MCC whiteboard] | ||
| − | =Happenings since | + | =Monday 25 October= |
| + | #Happenings since Friday morning: | ||
#* Everyone seemed optimistic at Friday's morning meeting. | #* Everyone seemed optimistic at Friday's morning meeting. | ||
#* Started filling the target a little before 9:30, with Chris Keith watching, and the shift crew here. | #* Started filling the target a little before 9:30, with Chris Keith watching, and the shift crew here. | ||
#* We went into controlled access so that Tim could go in to do something for CPP. Sasha also needs to make an access. | #* We went into controlled access so that Tim could go in to do something for CPP. Sasha also needs to make an access. | ||
#* [https://logbooks.jlab.org/entry/3930361 This looked promising] | #* [https://logbooks.jlab.org/entry/3930361 This looked promising] | ||
| − | #* The problem was isolated to magnet YBBS04. The plan for its repair will be presented on Monday. | + | #* The problem was isolated to a ground fault in magnet YBBS04. The plan for its repair will be presented on Monday. |
#* Shifts are cancelled until Monday 10am. Monday 10am+ shifts are on standby. Tuesday shifts remain unaltered. | #* Shifts are cancelled until Monday 10am. Monday 10am+ shifts are on standby. Tuesday shifts remain unaltered. | ||
#* The target has been emptied, the solenoid is still on, and the hall is in power permit. | #* The target has been emptied, the solenoid is still on, and the hall is in power permit. | ||
Revision as of 08:25, 25 October 2021
<-- Summer 2021 RC meetings MCC whiteboard
Monday 25 October
- Happenings since Friday morning:
- Everyone seemed optimistic at Friday's morning meeting.
- Started filling the target a little before 9:30, with Chris Keith watching, and the shift crew here.
- We went into controlled access so that Tim could go in to do something for CPP. Sasha also needs to make an access.
- This looked promising
- The problem was isolated to a ground fault in magnet YBBS04. The plan for its repair will be presented on Monday.
- Shifts are cancelled until Monday 10am. Monday 10am+ shifts are on standby. Tuesday shifts remain unaltered.
- The target has been emptied, the solenoid is still on, and the hall is in power permit.
The next meeting will be at 08:45 on Monday.
Monday plans: VIP visit (NL & Hall B) + arc 7 magnet tests + pass change. Bill asked about changing DIRC water.
By 1:30 will know what the magnet repair plan is. There is a spare on site. It would take about 2 weeks to swap.
Monday 10am+ shifts are on standby.
Friday, October 22
- Last 24h: Production runs continued smoothly until 2:51pm when an arc magnet tripped. About 7pm the team looking at the power supply found that there was a short in any one of the 42 magnets downstream, they will resume work in the morning. Shifts were cancelled until 9am.
- Remaining issues:
- BCAL noise at 10 o'clock
- Bleedthrough
- Plan:
- Call Chris Keith (to watch the target fill).
- When the beam is back, continue production at 200nA after the usual checks (radiation levels & harp scans)
- Continue running with the solenoid on & target full until further notice
- Pass change for A&B might be deferred to Saturday swing or Sunday day (A->4 pass)
- Expect downtime Monday morning for VIP tour, start time TBC probably ~7am.
Thursday, October 21
- Last 24h:
- No beam from 5:20pm Tuesday until early am Thurs due to LCW/power problem. Resumed production ~3:30am.
- New harp scan Previous harp scan
- Work done during the access:
- magnetic field measurements around CCAL
- 15 FCAL bases replaced and re-terminated one cable
- faulty FDC chiller replaced
- rebalanced the server power load on rack 13
- position survey CCAL
- correct shielding at the left (downstream) PS arm
- Remaining issues:
- Tagger hodoscope time shifts
- communication with accel. w.r.t. tagger magnet - Paul Vasilauskis (Ops group leader): "I am putting out to my staff to contact the hall if they do need to touch the magnet and am looking into adding wording to the magnet screens"
- BCAL noise at 10 o'clock
- Bleedthrough
- Plan:
- When the beam is back continue production at 200nA after the usual checks (radiation levels & harp scans)
- Continue running with the solenoid on & target full until Friday or later
- Pass change for A&B Saturday morning (A->4 pass)
- Expect downtime Monday morning for VIP tour, start time TBC probably ~7am.
- Ops will need another maintenance day before the energy change
