SMT Detector Efficiencies

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SMT Detector Efficiencies
Simon Dean
University of Manchester
Monday 18th November 2002
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Topics

• SmtNtuple5
• 2d Hit Efficiencies
• 1d hit efficiencies
• High Occupancies

This Talk
http//www-d0.fnal.gov/sdean/talks/SMTefficiencie
s.ppt
Quality Plots
http//www-d0.fnal.gov/run2_offline_software/silic
on/Si_qualitygraphs
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
SmtNtuple5

• Hep-Tuple produced by smttrack_reco
• One entry per track
• Array of crossed detectors
• Closest-cluster mode / keep all hits
• 2d hits, 1d hits, CFT hits

Semantics
Cluster Contiguous set of fired strips
exceeding thresholds for individual and group
ADC counts 1d Hit Position of
centre of cluster in local coordinates. p-side or
n-side. 2d Hit Point reconstructed from
related p-side and n-side 1d hits. Global
coordinates.
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
2d Hit Efficiencies
Crude Variable clstat - cluster status

• 0 if track crosses surface, hit exists, this is
  the hit
• 1 if track crosses surface, hit exists, this is
  not the hit
• 2 if track crosses surface, hit does not exist.

Keep tally For each detector entry in SmtNtuple5

• If clstat 0 or 1, add a cross, add a hit
• If clstat 2, just add a cross
• Efficiency per detector is hits / crosses
• Binomial error

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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
2d Hit Efficiencies
Very general efficiency, tracking and hardware
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
1d Hit Efficiencies
Try to isolate hardware efficiencies Start by
finding tracking resolutions

• Use a 'no hit' track at each surface
• Find difference in position of hit and track
• Fit gaussian constant

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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
1d Hit Efficiencies
Variable xstat - crossing status
xstat0
xstat1
xstat2
Require xstat 0
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
1d Hit Efficiencies

• Require every track has pT gt 5GeV
• Look for closest 1d hit (p-side, n-side)
• Count as hit if within 5 sigma of track
• Efficiency is hits / crosses

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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Occupancy Efficiency
Only 2d so far... Occupancy cut if gt 30 of
strips fired During unpacking each event

• Output detector serial no and number of dropped
  chips
• Efficiency 1 - (n_dropped_chips) / (chips
  events)

1d Hit Efficiencies soon
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
To do.....
1d occupancy efficiencies
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
SmtNtuple5
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
and now for something completely different.......
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
Compare runs 152645 and 153982 Run 152645 is 'bad'

• 1.9 hours long
• Shifter note - 'major HV problem'
• Taken late April

Run 153982 is 'good'

• gt2 hours long
• 'physics' run type
• Evaluation of 'good' from SMT and CFT.
• Overall run evaluation also 'good'
• Taken mid-May

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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison
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Simon Dean - SMT Detector Efficiencies
Monday 18th November 2002
Offline Data Quality Plots Comparison