Revision as of 22:53, 21 October 2021

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

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.
- - extra PS shielding added on Wednesday
  - FCAL comms restored

@@ Line 25: / Line 25: @@
 =Friday, October 22=
-# Production runs continuing. 14:51 ARC magnet tripped 17:48 PD says a team is in looking at the power supply.
+# 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. [https://logbooks.jlab.org/entry/3930057 Shifts were cancelled until 9am.]
+#** [https://logbooks.jlab.org/entry/3929614 extra PS shielding added on Wednesday]
+#** [https://logbooks.jlab.org/entry/3929964 FCAL comms restored]
+# Remaining issues:
+#* BCAL noise at 10 o'clock
+#* Bleedthrough
+# [https://halldweb.jlab.org/primexd/run_plan/Run_Plan_Fall_2021.pdf Plan:]
+#* Call Chris Keith (to watch the target fill) & staff the counting house when we expect beam within 3h.
+#* 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
+#* [https://cebaf.jlab.org/files/ops/accboard/ Pass change for A&B Saturday morning (A->4 pass)]
+#* Expect downtime Monday morning for VIP tour, start time TBC probably ~7am.