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