DIRC Operations Report

Wednesday 2007/6/6 to Wednesday 2007/7/11

Oncall: Alejandro Perez, Bradley Wogsland, Justine Serrano
Fast Monitoring: Alejandro Perez, Bradley Wogsland, Justine Serrano, Jose Benitez


    PEP Activities     BaBar Activities     DIRC activities     Backgrounds     Scheduled activities     Pending Work     Links

Luminosities this week

PEP peak lumi: ~1.02 x 1034 (last week: ~1 x 1034)

PEP delivery: 3.92 fb-1 (last weeks: 3.29 fb-1)

BaBar integrated lumi:3.8 fb-1 (last weeks: 3.17 fb-1)

Run 6 total delivery: 58.29 fb-1

Run 6 total BaBar recorded: 56.02 fb-1 total, including 4.18 fb-1 off-peak data

PEP activities/issues since last DIRC meeting

  • 06/11: Switched to Offpeak running.
  • Hot weather has disrupted operations, limited data integration.
  • 06/15: Magnet Power Supply tripped around 6.30am. Recoverred by 8am.
  • 06/19: After taking 4.18 fb-1 of offpeak data PEP switched to Onpeak running.
  • 06/21 to 06/22: ROD. They replace a bellow in arc3 which was producing a lot of HER aborts.
  • 06/27: ROD. PEP people remove two flexible flanges in arc5. Beams back in the night.
  • 07/09: Vacuum problem since several days, finally a vacuum leak was found near backward Q5.

    BaBar activities/issues since last DIRC meeting

  • 06/11: UPS battery replacement.
  • During the week, some subsystems have raised temperature thresholds because of hot weather.
  • 06/15: HVAC rebooted their control computer and all the central chiller went off (accidentally).
  • 06/21: ROD. Tried to fix a EH cooling problem but the spare didn't fit.
  • 06/27: ROD. Two FEAs from the DCH has been changed succesfully.

    DIRC activities/issues since last DIRC meeting

  • 06/07: New problem with 8 flaky channels in sector 3.
  • 06/11: Masked 8 noisy channels (7 in sector 6 and 1 in sector 8)
  • 06/14: A flaky temperature sensors (in sector 10) started to give many yellow alarms due to heat wave. We raised the inlet temperature yellow alarm threshold for this sector (from 34 to 35 degrees).
  • 06/15: Due to central chiller problem the DIRC chiller tripped and FEE went off. DIRC recovered fine after HVAC people turned central chillers back on.
  • 06/19: 8 noisy channels masked out (DFB 0, sector 0).
  • 06/21: ROD activities:
  • 06/22: After the ROD, HV group 1 in sector 0 tripped because of the Xmas tree. We set the runnable value at 900V so that it didn't trip anymore.
  • 06/27: ROD Activities:
  • Bad background conditions since the 3rd of July which is due to a vacuum leak. This causes a lot of red alarms in the scalers and DIRC dead time. We raised the alarm thresholds :

    See DIRC logbook for details

    Lumi and Background this month