Gabriele Cosmo
81 lines
3.4 KiB
C++
81 lines
3.4 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: G4WeightWindowAlgorithm.hh 66356 2012-12-18 09:02:32Z gcosmo $
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//
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// ----------------------------------------------------------------------
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// Class G4WeightWindowAlgorithm
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//
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// Class description:
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// Implementation of a weight window algorithm.
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// The arguments in the constructor configure the algorithm:
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// - upperLimitFaktor: the factor defining the upper weight limit
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// W_u = upperLimitFaktor * W_l (W_l lower weight bound)
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// - survivalFaktor: used in calculating the survival weight
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// W_s = survivalFaktor * W_l
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// - maxNumberOfSplits: the maximal number of splits allowed
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// to be created in one go, and the reciprocal of the minimal
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// survival probability in case of Russian roulette
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//
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// In case of upperLimitFaktor=survivalFaktor=1 the algorithm
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// becomes the expected weight algorithm of the importance sampling
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// technique.
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//
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// see also G4VWeightWindowAlgorithm.
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//
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// Author: Michael Dressel (Michael.Dressel@cern.ch)
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// ----------------------------------------------------------------------
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#ifndef G4WeightWindowAlgorithm_hh
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#define G4WeightWindowAlgorithm_hh G4WeightWindowAlgorithm_hh
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#include "G4Nsplit_Weight.hh"
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#include "G4VWeightWindowAlgorithm.hh"
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class G4WeightWindowAlgorithm : public G4VWeightWindowAlgorithm
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{
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public: // with description
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G4WeightWindowAlgorithm(G4double upperLimitFaktor = 5,
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G4double survivalFaktor = 3,
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G4int maxNumberOfSplits = 5);
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virtual ~G4WeightWindowAlgorithm();
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virtual G4Nsplit_Weight Calculate(G4double init_w,
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G4double lowerWeightBound) const;
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// calculate number of tracks and their weight according
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// to the initial track weight and the lower energy bound
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private:
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G4double fUpperLimitFaktor;
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G4double fSurvivalFaktor;
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G4int fMaxNumberOfSplits;
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};
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#endif
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