Revision as of 12:48, 22 October 2021

<-- Summer 2021 RC meetings MCC whiteboard

Happenings since the Friday morning meeting

1. • No news from the accelerator yet but everyone seemed optimistic at the 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 looks promising

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