News about GenIma

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News about GenIma
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• GenIma
• official version and Opera note ( see Lionels
  mail
• geriatic fortran also accessible)
• Recent works on single microtrack efficiencies
• No image, clustering, emulations of Sysal,
  Suts,etc, (in waiting for processing the images)
• Attempts for dE/dX study
• D.Boutignynew images format and catalogue

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• Microtrack efficiency
• Clustering ( threshold)
• Track finding (road-widths) ( Sysal, SUTS
  emulations)
• N associated grains is ? 6 ?
• Images too heavy ( 5 hours for 1000 tracks)
  trick to avoid them in keeping their integration
  property

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• TRICK (for clustering, one track)
• From Geant output, determine slope of the track
  projected on a frame divide this line in 1024
  cells
• For a frame i, project the light (shadows or
  neat grain) on this ccd bar ( 1 dimension
  instead of 2) and integrate light for all grains
• Search for maxima in the corresponding histo
• For a given threshold, a maximum defines a
  cluster cuts also possible on the width of
  peaks

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Smart Tracker emulation (old)

• cells of 25 microns in the frame
• Search for 3 consecutive clusters in cell i,j
• Then complete grain association in the other
  planes, without cell restriction
• Keep the combination with the max number N of
  associated clusters
• If N?6 the track is accepted

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SUTS emulation tentative

• Start in the middle frames is there one cluster?
• Based on this point, try all directions of a
  scanning ray
• If, in another plane, a cluster is at a distance
  ? road R
• of the ray plane intercept, take the cluster
  circle and calculate the overlap with the
  projected ray circle add
• the intersected common surface ? (grey level ) to
  the pulse height
• Keep the directions leading to the highest pulse
  height
• If the best pulse ? (threshold), track accepted

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Preliminary and limited results

• Simple cluster finding, and the old SmartTracker
  emulator adjust threshold and road width
• Dry objective, one track/frame,no fog, 1000 evts
• Compared to square root of base tracks ? ( Ciro
  Pistilli in Lyon emulsion meeting)
• track angle Genima real data
• 0 mrad 925
  0.93
• 200 mrad 892
  0.89
• 400 mrad 807
  0.812
• 600 mrad 664

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SmartTracker (new)

• Waiting for a precise description Cristiano
• has started to give me informations about
  it
• Data look much flatter in angular dependance

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dE/dX

• Started with SUTS emulation pulse height
• Dynamics input grains number is 125 (30 MeV/c)
• and 16 (300 MeV/c)
• Increase number of frame? But depth of field 2
  micron!
• Define the good parameters for one emulsion layer
• Then apply to several gap lead/emulsion
• Same for Sysal how many frames/emulsion needed?
• Saturation is tuning compatible with a good
  track efficiency ? Devoted guided re-scan?

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Conclusions

• Soon microtrack efficiency and its parameters
  for new ,old sysal and SUTS
• In progress strategies for dE/dX exploitation
  for which Genima can be very useful
• Production of complete neutrino events for vertex
  elaboration studies