DIRC Operations Weekly Report
Period: Wednesday 2007/7/18 - Wednesday 2007/7/25
Oncall: Rolf Andreassen
Fast Monitoring: Rolf Andreassen, Justine Serrano
Luminosities this week
PEP peak lumi: ~1.0 x 1034
(last week: ~9.7 x 1033)
PEP delivery: 2.97 fb-1
(last weeks: 3.19 fb-1)
BaBar integrated lumi:2.81 fb-1
(last weeks: 3.12 fb-1)
Run 6 total delivery: 64.45 fb-1
Run 6 total BaBar recorded: 61.95 fb-1 total, including 4.18 fb-1 off-peak data
PEP activities/issues this week
Throughout : Problems with beam-current monitor led to difficulties in trickling the HER. This made it necessary to go back to the old fill-and-coast system for long periods, particularly almost the whole weekend.
07/20: Replacement of QD4R rectifier took roughly 1.5 hours. Tuner in HER 12-4 stuck, 1.3 hours lost.
07/22: Again the HER 12-4 tuner, 25 minutes to do 'local cable reseat'. Kicking the tuner until it unsticks?
07/23: Swap chassis on EP02 magnet controller, 3 hours.
07/24: Fix loose connection in region 6, which was causing RF aborts. Replace 12-4 cavity tuner driver's supply.
BaBar activities/issues this week
07/21: Maximum length of runs changed to 75 minutes to accommodate PEP fill-and-coast cycle.
DIRC activities/issues this week
07/19 : Matt turned off dump valve for the UPS battery replacement, but the wrong kind of batteries were delivered.
07/24 : Matt cleaned the air filters.
See DIRC logbook for details
Lumi and Background this week
- Replace four DFBs with goups of 8 dead or flaky channels:
- sector 0, DFB 0.
- 2 in sector 1, DFB 1 and DFB 13.
- sector 3, DFB 6.
- sector 8, DFB 0.
- Replace air filters on Wiener crates.
- Investigate the crate of sector 8.
Justine, Jose and Rolf rotating backup & on-call commissioning duties.