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Overview and Geometrical importance biasing



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March 2006 Geant4 v8 0p01 Event biasing I Overview and Geometrical importance biasing Toyama National College of Maritime Tech Tsukasa Aso Geant4 Tutorial Course March 2006 Geant4 Tutorial Course 1 Contents Overview Geometric biasing Setup of Geometric biasing Examples extended biasing Plan March 2006 Geant4 Tutorial Course 2 Event biasing Overview March 2006 Geant4 Tutorial Course 3 Event biasing in Geant4 Event biasing variance reduction techniques are a vital requirement for many applications Since Geant4 is a toolkit and also all source code is open the user can do whatever he she wants Capable users in experiments institutions created their own implementations of event biasing for their needs These feature could be utilized by many application fields such as Shielding Radiation environment assessment Dosimetry It is more convenient for the user if Geant4 itself provides most commonly used event biasing techniques March 2006 Geant4 Tutorial Course 4 Event biasing techniques Production cuts threshold This is a biasing technique most popular for many applications Geometry based biasing Importance weighting for volume region Duplication or sudden death of tracks Leading particle biasing Taking only the most energetic or most important secondary Primary event biasing Biasing primary events and or primary particles in terms of type of event momentum distribution etc Forced interaction Force a particular interaction e g within a volume Enhanced process or channel Increasing cross section for a process Physics based biasing Biasing secondary production in terms of particle type momentum distribution cross section etc W eight on track event March 2006 Geant4 Tutorial Course 5 Current features in Geant4 Partial MARS migration n p pi K 5 GeV Since Geant4 0 0 General particle source module Primary particle biasing Since Geant4 3 0 Radioactive decay module Physics process biasing in terms of decay products and momentum distribution Since Geant4 3 0 Geometry based biasing



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