Central Scintillator TOF studies D. Hedin NIU 10802

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Central Scintillator TOF studies D.
Hedin NIU 10-8-02

• Have looked (using Mike Eads ntuple) at almost
  all the central scintillators to determine TOF
  corrections (not side B and bottom C as few
  statistics)
• Calibrate individual channel T0s by hand - need
  individual channel T0s in database for best
  resolution. Hope this happens soon(!)
• Get resolution of 3 ns for side/top C, 2 ns for
  bottom B and 2 ns for bottom A (shown in August).
  Can A-layer resolution be improved? (change
  HV/threshold??)
• Updated code in muo_segmentlinkedlist/LocalSegment
  .cpp and is being put into cvs. Will want Mike to
  rerun ntuple to double check. Ready for p13
• see www-d0.fnal.gov/hedin/tof.html for more
  information

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Central Bottom B
Position vs time after T0s determined (not did
not have both channels
Time dividing counters up into 5 distance bins
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Central Bottom Bresolutions with T0 and TOF--get
better than 2 ns
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Central C-Side/Top

• Tune both PMTs after TOF corrections. Get 3 ns
  resolution if average 2 PMTs and 2 ns if take
  closest to 0. Somewhat of cheat but that is what
  is used in MSCHit

raw
Peds
Ave PMTs and TOF
PMT closest to 0
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Time vs position has asymmetry in each
sub-octant. Have looked at all 12 side/top
Oct 1-0 raw (0)
Oct 1-0 with TOF
Oct 1-1 raw (25)
Oct 1-1 with TOF
Perhaps needs more tuning??
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Individual C-layer Channels with TOF(3-4 ns RMS)