TRD Software Meeting, 21'04'05

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TRD Software Meeting, 21.04.05

• Progress of PID in TRD reconstruction (Prashant)
• Fast simulations (Wolfgang)
• Ongoing aliroot changes (Christoph)
• Digitzer updates (Christian)
• AOB

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Geometry

• Introduction of layer 0
• Length in z as layer 1
• New chamber widths
• Changes of numbering scheme
• Stack numbering increasing in negative
  z-direction
• Pad row and column numbering
• Modification for PHOS
• 2 adjacent PHOS modules without material in front
• Modification in FRAME -gt Different HOLE geometry
  (only two supermodules w/o TRD TOF)

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Pad Plane

• Update of implementation of pad plane
• So far
• Pads were defined by a simple equidistant
  division of the sensitive chamber area -gt
  averaged pad size
• Reality
• Outer two pads have different dimensions than the
  others -gt Davids note (14.3.05)
• New pad plane for layer 0
• New implementation
• AliTRDpadPlane class
• Contains all pad plane data (pad plane
  dimensions, dimensions of inner and outer pads,
  tilting angle, etc.)
• Will be used in digitizer
• Update of pad response needed (-gt Christian)

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Digitizer (Christian)

• Remove fixed time bin size
• New parameter
• Sampling frequency (10 MHz default)
• Drift velocity from time structure
• Electron position is directly translated in drift
  time
• GetDriftVelocity()
• Is still in and used by reconstruction
• In real life it will come from data (calibration
  / drift monitor)
• Need to implement procedure in reconstruction -gt
  GetDriftVelocity() can be removed

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Other

• Ongoing activity by Marian on the TRD tracking
• Each change in digitizer and tracking might
  require retuning of the PID
• Will take a couple of iterations
• No activity on the PDC for TRD yet
• Trouble with ALIEN
• Stick to old release with consistent tuning
• Recent updates not used, since code to unstable
  right now

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