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Minutes SCT Digitization Task Force 25 May 2010
Present: Richard Batley, Taka Kondo, Steve McMahon, Shaun Roe, Pat Ward
Review of actions: Shaun>
TWiki created at https://twiki.cern.ch/twiki/bin/view/Atlas/SctDigitizationTaskForce
Mobility measurements from drift detectors are not so reliable due to resistivity variations.
Richard>
See talk in this meeting describing Richard's montecarlo strategy
Steve>
Steve is continuing to look over timing measurements of two strip clusters -> *action> report later
Reisaburo et. al>
The Twiki above has some links to parameters used in the code (should be more fully documented, also the duplication of some parameters across code units ->
*action> Shaun, Pat et al. continue to document parameters, [Pat should add comment on G4 parameters])
Reisaburo has set up a meeting to discuss simulation of the effects of radiation damage with our pixel colleagues on Friday at 15:00
Presentations
Richard presented the MonteCarlo strategy he is using in the Athena framework, calling existing Athena tools from within custom code which creates charges in silicon with the desired position.
Certain questions arose: Is the cross talk correctly modelled (the sign looks inverted on the plots shown)? Is it clear what the effect of 'timing in' is on (for example) the response curve of the output? (is it clear that our optimisation on the 01X timing pattern is really optimal?)
Richard continues to update his code to run in the latest release.
Taka presented the detailed modeling he has done using a Finite Element Model to solve Poisson's equation in the detector followed by custom charge transport and charge induction/amplifier response. He compared this with the 'ballistic' model used in the existing digitization. There are clear differences in the timing and amplitude of the pulses, particularly in the interstrip region.
There was some discussion of how to marry the two strategies presented. As a first step, it was decided that Taka could give Richard a parameterized 2D map of the detector resulting from the FEM calculation.
*action> Taka and Richard to discuss appropriate parameters to map and the detailed format of the map file, with a view to using this inside Richards existing code.
Shaun was worried that this still does not address the issue of discovering which might be the most sensitive parameters for quantities such as the Lorentz angle, but the first step is cataloguing the effects must be to list the extant parameters as outlined above.