Data Taking Statistics Week of 2002 December 915

1
Data Taking StatisticsWeek of 2002 December 9-15

• Corrections to determine Physics Lumi Events to
  Tape
• Interface Board Crate tripped 1800 Dec 12th
• Ran without 1/8th of our Silicon for last six
  hours of Store 2070
• Recorded 231 nb-1 684k events of marginal
  Physics quality
• Special Run Muon Pixel threshold study
• Performed during destructive End of Store studies
  on Dec 14th
• Needed Luminosity information for normalization
• Recorded 4 nb-1 161k of non-Physics events

14 Hours of downtime deadtime affected our
efficiency

• Physics Recorded Lumi of 4.0 pb-1 or 70.0 of
  Delivered Lumi
• ? Recorded 7.6 million Physics Quality Events

2
Unbearable Sources of Downtime
gt8.5 hours!
Friday the 13th

• 1.5 hrs Trigger Framework Readout Crate
  missing or sending garbage
• Two failure modes misdirected shifters
  experts to other possible problems
• 1.4 hrs Begin Store SMT HV Problems  
• Inexperienced shifters, 3AM begin of stores
  incorrect HV status in GUI
• 2.4 hrs Online Cluster Hang Reboot
• A presumably safe umount command hung, followed
  by a domino effect
• 1.5 hrs Muon rate test to debug MDT and PDT
  failures
• 0.9 hrs SMT HDIs prevented readout
• 0.6 hrs Loaded untested Muon FE code

These two problems cost us three hours in total
Del. Lumi
3
Other D0 News

• Took advantage of the never-ending controlled
  access opportunity on Mon Dec 9th
• Muon PDT HV problem fixed
• FPD commissioning
• Trigger L1 CTT L1 Muon
• SMT Rack Interface Crate tripped off 1800 Thu
  Dec 12th
• Requested granted 20 min CA after end of Store
  2070
• While waiting for magnets to be powered down,
  expert continued to play remotely with the GUI
• Unexpectedly, the remote reset worked this time
• Temperature, Magnets, New Day?
• Did a proof of principle run with all SMT before
  confirming with MCR that we did not need access
• Crossed fingers. Will replace RM during January
  shutdown

• When I'm good, I'm very good. But, when I'm bad,
  I'm better.
• Mae West from Im No Angel
• Despite the large amount of downtime, we had some
  of our best data taking efficiency last weekon a
  run by run basis
• Seven 3 hour runs with 90 or better efficiency
  (Rec/Del Lumi)
• 7 out of the 17 runs to date
• All systems w/no known problems
• Even better, three of them were at initial lumi gt
  2.4E31 which we had never done before
• Ending on a high note
• Dec 15th single best day for D0 Recorded
  Luminosity 1.2 pb-1

Next slide
4
L1/L2/L3 RatesStore 2076 Sun Dec 15th from
0417
Special L1CTT Run
Only 5 brief pauses through midnight run lt 1
min between each run
5
Plans for Upcoming Week

• Lessons were learned from problems last week
• Trigger Framework Readout Crate monitoring
  power glitches
• System changes performed between stores
• Or at EOS if beam is required for system check
• Silicon HV monitoring ramping procedures
  being upgraded
• Next Friday the 13th not until June 2003!
• Preparing for Supervised Access on Tue Dec 17th
• A number of jobs queued up mainly for Trigger
  Commissioning integration of FPD into global
  readout
• Run Plan for Holiday Period Dec 16th Jan 5th
• Limited personnel, shifters and experts
• Non-critical tests changes will be postponed
• Conservative rates stress stability

6
Store 2076 L2/L3 Rates