Revision as of 09:04, 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

@@ Line 10: / Line 10: @@
 #** [https://logbooks.jlab.org/entry/3928624 faulty FDC chiller replaced]
 #** [https://logbooks.jlab.org/entry/3928742 rebalanced the server power load on rack 13]
-#** ? position survey CCAL ?
+#** position survey CCAL
-#** ? correct shielding  at the left (downstream) PS arm ?
+#** correct shielding at the left (downstream) PS arm
 # Remaining issues:
 #* [https://logbooks.jlab.org/entry/3929404 Tagger hodoscope time shifts]