| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4WeightWindowAlgorithm.hh,v 1.7 2006/06/29 18:16:59 gunter Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-03 $
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| 29 | //
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| 30 | // ----------------------------------------------------------------------
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| 31 | // Class G4WeightWindowAlgorithm
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| 32 | //
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| 33 | // Class description:
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| 34 | // Implementation of a weight window algorithm.
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| 35 | // The arguments in the constructor configure the algorithm:
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| 36 | // - upperLimitFaktor: the factor defining the upper weight limit
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| 37 | // W_u = upperLimitFaktor * W_l (W_l lower weight bound)
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| 38 | // - survivalFaktor: used in calculating the survival weight
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| 39 | // W_s = survivalFaktor * W_l
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| 40 | // - maxNumberOfSplits: the maximal number of splits allowed
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| 41 | // to be created in one go, and the reciprocal of the minimal
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| 42 | // survival probability in case of Russian roulette
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| 43 | //
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| 44 | // In case of upperLimitFaktor=survivalFaktor=1 the algorithm
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| 45 | // becomes the expected weight algorithm of the importance sampling
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| 46 | // technique.
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| 47 | //
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| 48 | // see also G4VWeightWindowAlgorithm.
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| 49 | //
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| 50 |
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| 51 | // Author: Michael Dressel (Michael.Dressel@cern.ch)
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| 52 | // ----------------------------------------------------------------------
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| 53 | #ifndef G4WeightWindowAlgorithm_hh
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| 54 | #define G4WeightWindowAlgorithm_hh G4WeightWindowAlgorithm_hh
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| 55 |
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| 56 | #include "G4Nsplit_Weight.hh"
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| 57 | #include "G4VWeightWindowAlgorithm.hh"
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| 58 |
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| 59 | class G4WeightWindowAlgorithm : public G4VWeightWindowAlgorithm
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| 60 | {
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| 61 |
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| 62 | public: // with description
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| 63 |
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| 64 | G4WeightWindowAlgorithm(G4double upperLimitFaktor = 5,
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| 65 | G4double survivalFaktor = 3,
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| 66 | G4int maxNumberOfSplits = 5);
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| 67 |
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| 68 | virtual ~G4WeightWindowAlgorithm();
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| 69 |
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| 70 | virtual G4Nsplit_Weight Calculate(G4double init_w,
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| 71 | G4double lowerWeightBound) const;
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| 72 | // calculate number of tracks and their weight according
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| 73 | // to the initial track weight and the lower energy bound
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| 74 |
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| 75 | private:
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| 76 | G4double fUpperLimitFaktor;
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| 77 | G4double fSurvivalFaktor;
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| 78 | G4int fMaxNumberOfSplits;
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| 79 | };
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| 80 |
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| 81 | #endif
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