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Norman, Hans, Tony, Jeremy, Nick, Matt Charles, Ron Cassel, Rich, Rob, Tim, Caroline, Dima
Tim's talk:
- Tim and Jeremy wanted to avoid a big heirarchy of xml files and keep it compact.
- GeomConverter creates the big geometry from the compact xml.
- big geometry used by both SLIC and org.lcsim
Did I get the description of the files correct?
About the multiplicity of SimTrackerHits:
When G4 propagates a track through a silicon detector, G4 may produce one or many G4 stepping points. This is under the control of various
material cut parameters in G4. There was a long discussion about the optimal choices for the cut parameters: the tradeoff is speed vs fidelity. Whichever is chosen, SLIC can be configured to create one SimTrackerHit for each stepping point or it can be configured to
create a single SimTrackerHit representing all of the G4 stepping points. In this latter case, the energy loss is the sum of the energy loss of summed over all G4 stepping points. I am not sure what the reported position and momentum are: but the are probably those values at one of the stepping points near the middle of the step through the material?
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Norman asked if the cylindrical geometry could be represented using this scheme. I don't remember the answer - does anyone?
IDDecoder
There was a long discussion on whether not the IDdecoder should be something that gets returned by the RawTrackerHit or something else. The argument in favour of this is that users are guaranteed to get the correct IDDecoder. If they have to just know the correct IDDecoder, they will get the wrong one.
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Matt Charle's talk
Needs to be addedcopied from the Fermilab demo ILC docdb.