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DØ Status: 03/11 – 03/18. Week integrated luminosity 1.1 pb -1 delivered (recorded by D0) 0.7 pb -1 lost due to Master Clock 1.0 pb -1 utilized (recorded runs) 65% Live Fraction… Excluding Master Clock issues Affected three stores last week (1068,1070,1072)

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d status 03 11 03 18
DØ Status: 03/11 – 03/18
  • Week integrated luminosity
    • 1.1 pb-1 delivered (recorded by D0)
      • 0.7 pb-1 lost due to Master Clock
    • 1.0 pb-1 utilized (recorded runs)
    • 65% Live Fraction…
    • Excluding Master Clock issues
      • Affected three stores

last week (1068,1070,1072)

  • Data collection downtime
    • ~15 min lost Begin/ End Store
      • HV ramps, run config, L3/DAQ
    • Muon readout crates
      • 15% of total downtime
    • Remaining sources
      • L3/DAQ, CAL/CFT/SMT readout crates

L3 Input Rate

15 March 2002

~50 Hz

Muon

Store

1080

Store

1082

Events/15s

Hours

No store

VRC & SMT

Power Cycle

Alan L. Stone

Louisiana Tech University

problems with master clock
Trigger framework problems began owl shift 3/12 (Store 1070)

Seq halt & clock parity errors

DØ Experts investigated

Potentially bad PCC module but no spare!

Called MCR for help

Steve Chappa – found spare PCC module

(but not certified)

Needed extension mods to provide sync for data taking

Successful TFW run

Using 2nd PCC module w/kluged phase lock loop circuit board from 1st PCC module

MC Timing output signals wrt beam x-ing has moved less than 2 ns compared to recent measurement (23-FEB-02)

We still don’t know why it failed…

Will have spare working PCC within the week

Problems with Master Clock

Phase Coherent Clock

3/12 13:00

3/13 10:00

3/13 13:30

Alan L. Stone

Louisiana Tech University

d detector status
We made no Controlled Access requests

Took advantage to make minor repairs & to do small detector maintenance jobs

Calorimeter: Full readout

T&C FPGA change moved timing by max 30 ns each readout crate

BLS power supplies stable

SMT: Full readout

No LV supply trips in past three weeks!

CFT: Steady improvement

All axials & 50% stereo boards

Total channel readout increases with each access & board swaps

Muon: Steady running

Readout crate errors are major issue  under study

29/500k events source of errors

DØ Detector Status

Sub-detector Report

Alan L. Stone

Louisiana Tech University

Alan L. Stone

inter cryostat detector
Inter-Cryostat Detector
  • Joint effort: Univ. Texas-Arlington&Louisiana Tech Univ.
  • Enhances the hermeticity and uniformity of the Calorimeter System
    • Rapidly changing material profile & extra “dead” material between the Central & Endcap Calorimeters
    • ICD provides additional sampling in the ICR
  • Improves ET calculation & Jet Energy Resolution
    • Crucial role in coverage of 1.1 < || < 1.4
    • Reduce rate of fake ET
  • Commissioning of Calorimeter Readout
    • ICD channels “sprinkled” throughout most of the calorimeter readout system

Alan L. Stone

Louisiana Tech University

d detector
DØ Detector

ICD

Alan L. Stone

Louisiana Tech University

inter cryostat region
Inter-Cryostat Region

 = 1.1

 = 1.4

Alan L. Stone

Louisiana Tech University

slide8

Comparison of pre-Oct 2001 data and post-Nov 2001 data. The north part of the ICD (<0) was <5% instrumented prior to Oct 2001. The left plots (top & bottom) show the change in the average event energy in the north ICD channels pre/post shutdown. The right plots are of the south ICD, which has been fully instrumented since May 2001.

Pre-October

GeV

GeV

Post-November

GeV

GeV

North

South

Alan L. Stone

Louisiana Tech University

icd status
50% in readout by end-May 2001

Fully instrumented & part of global data taking since Nov 2001

Integrated into CAL Readout & Shift Guide

Stable HV system

Spare electronics & cables in stock

Working LED calibration system

Repair & maintenance during detector accesses

e.g. Replace Run 1 PMTs with new ones

Fine-tune energy scale & weights

Improve MC geometry & material representation

ICD Status

Done

To Do

Alan L. Stone

Louisiana Tech University

plans for this week
Plans For This Week
  • Need 2 hr access (day & time TBD)
    • Muon VME crate (1 of 12) needs human intervention
  • Steady supply of small jobs … if offered additional access time
  • During studies Tuesday & Wednesday
    • Significant Event Server tests
    • Spare PCC tests
    • Muon readout
      • Test new code & new hardware
    • Test of multibuffering VRBCs
  • Global data taking during stores
    • Working on increasing data collection efficiency

Alan L. Stone

Louisiana Tech University

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