Pixel Counters Online Results - PowerPoint PPT Presentation

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Pixel Counters Online Results

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for off-line reconstruction needed: T0s, survey. Pixel Counters Online Results ... Pixel Counters Online Results. Timing spectra for 8 B-layer South octants ... – PowerPoint PPT presentation

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Title: Pixel Counters Online Results


1
Pixel Counters Online Results
  • Igor Vasilyev
  • September 13, 2001

  • Current status
  • all 48 octants are in readout, 99.9 of channels
    are working, monitoring is working well
  • HV, thresholds, timing are selected and checked,
    no further changes in operating parameters
  • PMT gain variations are below 10 over 3 months
  • backgrounds are low occupancy about 0.1 per
    min_bias event
  • for off-line reconstruction needed T0s, survey

2
Pixel Counters Online Results
  • Special runs
    Triggers min_bias mu1pix_fz
    mu1pix_nofz mu2pix_fz Two sets of
    trigger gates width (ns) 88(A), 58(B), 88(C) and
    40, 40, 46. ADC gates width 88 ns,
    TOF gate 88 ns.
  • Reduction in trigger rates 2 with second set of
    trigger gates for all triggers twice less is
    background
  • Muon timing peaks are clearer
  • Trigger gates 40 ns (A-layer),
  • 40 ns (B-layer) and 50 ns (C-layer)
  • are set as defaults on September 7.
  • Plan is to collect reasonable amount
  • of data before October shutdown
  • with these settings.

3
Pixel Counters Online Results
Hit maps for pixel octants
4
Pixel Counters Online Results
Timing spectra for 8 B-layer South octants
5
Pixel Counters Online Results
Timing spectra for 8 C-layer South octants
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