Revision as of 08:04, 26 October 2021

<-- Summer 2021 RC meetings MCC whiteboard

Tuesday 26 October

1. Last 24h:
   • ops event log Magnet experts found & fixed a small LCW leak. MCC aimed to have beam to all 4 halls by midnight. They did the pass change but were unable to get beam to hall D. All the diagnostics for the problem magnet looked good. At just after midnight they gave up trying, will call DC power & magnet people back in the morning.
   • Bill & co changed DIRC water
   • Vertex plots with full target
   • temps of locked-up FCAL bases
2. Issues:
   • BCAL noise at 10 o'clock
   • Bleedthrough
3. Plan:
   • When the beam is back, call Chris Keith to watch the target fill & then continue production at 200nA after the usual checks (radiation levels & harp scans)
   • Hall A is aiming for another configuration change on Friday (might have a problem w SBS magnet).

Monday 25 October

1. 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.
2. 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.
   • 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.
3. Work done:
4. Issues:
   • BCAL noise at 10 o'clock
   • Bleedthrough
5. Plan:
   • VIP visit (NL & Hall B) + arc 7 magnet tests + pass change.
   • Bill asked about changing DIRC water.
   • When the beam is back, call Chris Keith to watch the target fill & then continue production at 200nA after the usual checks (radiation levels & harp scans)

Friday, October 22

1. 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.

arc 7 trip

1. • extra PS shielding added on Wednesday
   • FCAL comms restored
   • Alarm added on tagger magnet current
2. Remaining issues:
   • BCAL noise at 10 o'clock
   • Bleedthrough
3. 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

1. 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
2. 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
3. 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