# Presentation: 930593

## Data Taking StatisticsWeek of 2002 December 9-15

**Corrections to determine Physics Lumi & Events to Tape**
**Interface Board Crate tripped ~18:00 Dec 12****th**** **
**Ran without 1/8****th**** 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 14****th**
**Needed Luminosity information for normalization**
** ****Recorded 4 nb****-1**** &  161k of non-Physics events**

** ****Physics:  Recorded Lumi of 4.0 pb****-1**** or 70.0% of Delivered Lumi**
****** ****Recorded 7.6 million Physics Quality Events**

**~14 Hours of downtime & deadtime affected our efficiency**

## Unbearable Sources of Downtime

**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 **

**>8.5 hours!**

**Friday the 13****th**

**These two problems cost us three hours in total Del. Lumi**

## Other D0 News 

**Took advantage of the never-ending controlled access opportunity on Mon Dec 9****th**** **
**Muon PDT HV problem fixed**
**FPD commissioning**
**Trigger: L1 CTT & L1 Muon**
**SMT Rack Interface Crate tripped off ~18:00 Thu Dec 12****th**** **
**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 “I’m No Angel”**** **
**Despite the large amount of downtime, we had some of our best data taking efficiency last week...on 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 > 2.4E31 which we had never done before**
**Ending on a high note...**
**Dec 15****th**** single best day for D0 Recorded Luminosity ~1.2 pb****-1**

- Next slide

## L1/L2/L3 RatesStore 2076 – Sun Dec 15th  from 04:17 

**Only 5 brief pauses through midnight run & < 1 min between each run**

**Special L1CTT Run**

## 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 13****th**** – not until June 2003!**
**Preparing for Supervised Access on Tue Dec 17****th**** **
**A number of jobs queued up mainly for Trigger Commissioning & integration of FPD into global readout**
**Run Plan for Holiday Period:  Dec 16****th**** – Jan 5****th**** **
**Limited personnel, shifters and experts**
**Non-critical tests & changes will be postponed**
**Conservative rates – stress stability**

## Store 2076 – L2/L3 Rates