Gabriele Cosmo
82 lines
3.4 KiB
C++
82 lines
3.4 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// $Id: G4WeightWindowAlgorithm.hh,v 1.7 2006-06-29 18:16:59 gunter Exp $
|
|
// GEANT4 tag $Name: not supported by cvs2svn $
|
|
//
|
|
// ----------------------------------------------------------------------
|
|
// Class G4WeightWindowAlgorithm
|
|
//
|
|
// Class description:
|
|
// Implementation of a weight window algorithm.
|
|
// The arguments in the constructor configure the algorithm:
|
|
// - upperLimitFaktor: the factor defining the upper weight limit
|
|
// W_u = upperLimitFaktor * W_l (W_l lower weight bound)
|
|
// - survivalFaktor: used in calculating the survival weight
|
|
// W_s = survivalFaktor * W_l
|
|
// - maxNumberOfSplits: the maximal number of splits allowed
|
|
// to be created in one go, and the reciprocal of the minimal
|
|
// survival probability in case of Russian roulette
|
|
//
|
|
// In case of upperLimitFaktor=survivalFaktor=1 the algorithm
|
|
// becomes the expected weight algorithm of the importance sampling
|
|
// technique.
|
|
//
|
|
// see also G4VWeightWindowAlgorithm.
|
|
//
|
|
|
|
// Author: Michael Dressel (Michael.Dressel@cern.ch)
|
|
// ----------------------------------------------------------------------
|
|
#ifndef G4WeightWindowAlgorithm_hh
|
|
#define G4WeightWindowAlgorithm_hh G4WeightWindowAlgorithm_hh
|
|
|
|
#include "G4Nsplit_Weight.hh"
|
|
#include "G4VWeightWindowAlgorithm.hh"
|
|
|
|
class G4WeightWindowAlgorithm : public G4VWeightWindowAlgorithm
|
|
{
|
|
|
|
public: // with description
|
|
|
|
G4WeightWindowAlgorithm(G4double upperLimitFaktor = 5,
|
|
G4double survivalFaktor = 3,
|
|
G4int maxNumberOfSplits = 5);
|
|
|
|
virtual ~G4WeightWindowAlgorithm();
|
|
|
|
virtual G4Nsplit_Weight Calculate(G4double init_w,
|
|
G4double lowerWeightBound) const;
|
|
// calculate number of tracks and their weight according
|
|
// to the initial track weight and the lower energy bound
|
|
|
|
private:
|
|
G4double fUpperLimitFaktor;
|
|
G4double fSurvivalFaktor;
|
|
G4int fMaxNumberOfSplits;
|
|
};
|
|
|
|
#endif
|