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Status of ' and SMT rad status

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M. Weber, AEM 3/1/04. Status of .... and SMT rad status. Delivered: ... Weber, AEM 3/1/04. PDT021. PDT021 failed. Runs are flagged for degraded muon quality. ... – PowerPoint PPT presentation

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Title: Status of ' and SMT rad status


1
Status of .and SMT rad status
Delivered 10.4 pb-1 Recorded 9.2 pb-1 16 M
events Efficiency 88.5
2
(No Transcript)
3
PDT021
PDT021 failed. Runs are flagged for degraded
muon quality. Needs opening the detector for
repair ? 8h access on Wed.
4
More issues
  • Last night a powers supply for the trigger
    framework failed. "On a positive side we have
    had good spare, clear instructions how to
    proceed, clear labeling of all cabling, which
    make replacement easy."We have issues with
    calorimeter since (high noise).
  • Dropped interlocks...
  • Thursday quench25 rad to 50 rad from the BLM.

5
  • Bias voltage is the limiting factor
  • Breakdown of coupling capacitor and
    micro-discharge

6
  • damage constant (time and temp dependent)
  • flux (1 MeV n/cm2)
  • V Volume

Known
DIleak a F V
Current
Measured
Luminosity
7
at 2.7 cm
8
F-Wedge noise (Micron wedges) 15 of the r/o
channels
work in progress
9
Disabled HDIs
10
Conclusions
  • D0 was running well last week, but we need now to
    open the detector to fix a PDT and have some
    calorimeter issues.
  • We are assessing the D0 status with respect to
    aging/radiation.
  • SMT radiation monitoring is in place(includes a
    beam abort).
  • We do not see unexpected radiation effects, but
    we are only at the beginning of the lifetime.
  • The number of disabled HDIs in the SMT needs to
    be understood.
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