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Geant4 User Requirements: Physics Based Biasing

March 2007. Geant4 User Requirements: Physics Based Biasing. Jane Tinslay, SLAC. Physics Requirements. Would like to be able to implement everything/most of the techniques available in other Monte Carlo codes, including specialisations EGS family, Fluka, MCNP family, Penelope

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Geant4 User Requirements: Physics Based Biasing

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  1. March 2007 Geant4 User Requirements: Physics Based Biasing Jane Tinslay, SLAC

  2. Physics Requirements • Would like to be able to implement everything/most of the techniques available in other Monte Carlo codes, including specialisations • EGS family, Fluka, MCNP family, Penelope • Leading particle biasing • EM leading particle biasing • Hadronic leading particle biasing • Multiplicity tuning • Bremsstrahlung splitting • Uniform bremsstrahlung splitting with/without Russian Roulette • Selective bremsstrahlung splitting with/without Russian Roulette • Directional bremsstrahlung splitting Jane Tinslay, SLAC

  3. Implicit capture/survival biasing/non-analogue absorption • At a collision • Along a flight path • Cross sectional biasing • Path length biasing • Forced interaction • … • User defined biasing • Develop/experiment with new biasing techniques Jane Tinslay, SLAC

  4. Technical Requirements • User Biasing Code • Code to a minimal interface • Not G4VProcess • Most of interface is irrelevant, distracting • Cut down on unnecessary function calls, eg, StartTracking • Don’t need to modify existing G4VProcess physics process code • Don’t need to modify G4VUserPhysicsList • Can use pre-packaged physics lists • Put biasing code in dedicated user hook • Also serves as a useful starting point • Use a simple tool to do process list manipulation Jane Tinslay, SLAC

  5. Process list manipulation • Want to do multidimensional process list manipulation • Add/remove process • Create brand new process list • Override one or more DoIt/GPIL methods multiple times • Combine multiple DoIt/GPIL methods • Mask out specified processes • Clear documentation explaining how processing works, issues/features with particular processes • Biasing activation (Contextual processing) • Specify circumstance/set of circumstances in which biasing is to be applied • Eg, volume in world, energy, creator process… • Activation code independent from biasing code • Otherwise distracting • Code duplication Jane Tinslay, SLAC

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