# Presentation: 402149

## D0 Status: 02/18-02/25

- Week integrated luminosity
- 0.7pb-1 delivered
- to tape 0.45pb-1
- Data collection
- global data collections most of the time
- full detector in readout
- physics trigger menu
- reasonably stable DAQ running
- sending events to Level 3 trigger with rate of ~80Hz
- writing events to tapes with ~40Hz rate
- D0 farms operation
- stable running
- during last two weeks re-processed all “post November 2001” data in parallel to processing data coming from the detector
- D0 silicon radiation protection alarms
- got shot setup alarm before last store (again)
- losses during “event 13”

## Last Week Supervised Access Results

- General
- started on schedule at 6am on Thursday
- progressed as planned with detector opening
- spent two shifts inside the detector performing repairs
- started detector closing at 10am on Friday
- were ready for S&S at 4pm, as scheduled
- due to delay with S&S were able to finish full survey of the detector in closed configuration
- detector opening/closing went without problems and safely
- Silicon detector access
- were running with 6/8 power supplies for the last few weeks
- inspection after detector opening
- one supply had blackened fuse holder
- another supply had “personality” card failed
- both problems have been observed before (during January access)
- both power supplies are replaced and currently running OK** **
- improvements to power supplies been made which expected to increase reliability
- grounding on interface boards has been improved
- power supplies are running OK for now
- lost 4 supplies during 3 weeks following October 2001 shutdown
- lost 2 supplies within 10 days following January 2002 shutdown
- clearly first 1-2 weeks are the most critical

## Supervised Access (continue)

- Fiber tracker and preshower detectors
- total number of AFE boards used to readout VLPC based detectors have been increased to 125
- fiber tracker axial: 100%
- central preshower axial: 100%
- have one fully instrumented fiber tracker phi sector and second one is 7/8 done
- multiple improvements to infrastructure
- replaced flaky power supply
- fixed last problematic AFE backplane
- LED calibration electronics been installed
- Calorimeter
- replaced failed preamplifier power supply
- pulser modifications have been finished
- spare power supplies are delivered to the hall for fast replacement
- multiple minor improvements to calorimeter triggering and calibration been performed
- Muon system
- during detector opening one of A layer chambers demonstrated a short in its electronics
- fixed
- low voltage power supply for one of front-end VME crates has been replaced
- new version of scintillator readout controller been installed
- sending non-gated signals from collision hall to study aging of counters and phototubes as well as to better understand backgrounds

## D0 Status

- Plan for coming week
- cosmic ray running during Tuesday-Thursday
- supervised access during recycler repairs
- fiber tracker electronics installation
- muon trigger electronics debugging
- data collection starting later this week
- new trigger version 4.20
- full detector in readout
- Central tracking hardware/software commissioning is progressing well
- Z candidate selected using di-electron calorimeter trigger and reconstructed with reco version 10.14
- 11 and 12 hits tracks with opposite sign