1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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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 | // $Id: G4AdjointAlongStepWeightCorrection.hh,v 1.4 2009/11/20 10:31:20 ldesorgh Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | ///////////////////////////////////////////////////////////////////////////////// |
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30 | // Class: G4AdjointAlongStepWeightCorrection |
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31 | // Author: L. Desorgher |
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32 | // Organisation: SpaceIT GmbH |
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33 | // Contract: ESA contract 21435/08/NL/AT |
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34 | // Customer: ESA/ESTEC |
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35 | ///////////////////////////////////////////////////////////////////////////////// |
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36 | // |
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37 | // CHANGE HISTORY |
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38 | // -------------- |
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39 | // ChangeHistory: |
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40 | // 10 May 2007 creation by L. Desorgher |
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41 | // October 2009 implementation of the mode where the total adjoint and forward cross sections are equivalent. L. Desorgher |
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42 | // |
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43 | //------------------------------------------------------------- |
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44 | // Documentation: |
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45 | // Continuous processes acting on adjoint particles to correct continuously their weight during the adjoint reverse tracking. |
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46 | // Thi process is needed whene the adjoint cross section are not scaled such that the total adjoint cross section match the total forward cross section. |
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47 | // By default the mode where the total adjoint cross section is equal to the total forward cross section is used an therefore this along step weight |
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48 | // correction factor is 1. |
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49 | // However in some cases (some energy ranges) the total forward cross section or the total adjoint cross section can be null, in this case the along step |
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50 | // weight correction is neede and is given by exp(-(Sigma_tot_adj-Sigma_tot_fwd).dx) |
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51 | // |
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52 | // |
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53 | // |
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54 | |
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55 | |
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56 | #ifndef G4AdjointAlongStepWeightCorrection_h |
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57 | #define G4AdjointAlongStepWeightCorrection_h 1 |
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58 | |
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59 | #include "G4VContinuousProcess.hh" |
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60 | #include "globals.hh" |
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61 | #include "G4Material.hh" |
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62 | #include "G4MaterialCutsCouple.hh" |
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63 | #include "G4Track.hh" |
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64 | #include "G4ParticleChange.hh" |
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65 | |
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66 | class G4Step; |
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67 | class G4ParticleDefinition; |
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68 | |
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69 | |
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70 | |
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71 | class G4AdjointAlongStepWeightCorrection : public G4VContinuousProcess |
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72 | { |
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73 | public: |
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74 | |
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75 | G4AdjointAlongStepWeightCorrection(const G4String& name = "ContinuousWeightCorrection", |
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76 | G4ProcessType type = fElectromagnetic); |
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77 | |
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78 | virtual ~G4AdjointAlongStepWeightCorrection(); |
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79 | |
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80 | |
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81 | protected: |
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82 | virtual G4double GetContinuousStepLimit(const G4Track& track, |
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83 | G4double previousStepSize, |
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84 | G4double currentMinimumStep, |
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85 | G4double& currentSafety); |
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86 | |
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87 | |
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88 | //------------------------------------------------------------------------ |
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89 | // Generic methods common to all processes |
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90 | //------------------------------------------------------------------------ |
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91 | public: |
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92 | |
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93 | void PreparePhysicsTable(const G4ParticleDefinition&); |
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94 | |
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95 | void BuildPhysicsTable(const G4ParticleDefinition&); |
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96 | |
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97 | G4VParticleChange* AlongStepDoIt(const G4Track&, const G4Step&); |
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98 | |
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99 | |
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100 | private: |
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101 | |
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102 | void DefineMaterial(const G4MaterialCutsCouple* couple); |
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103 | |
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104 | |
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105 | |
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106 | G4AdjointAlongStepWeightCorrection(G4AdjointAlongStepWeightCorrection &); |
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107 | G4AdjointAlongStepWeightCorrection & operator=(const G4AdjointAlongStepWeightCorrection &right); |
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108 | |
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109 | |
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110 | |
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111 | protected: |
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112 | |
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113 | G4ParticleChange* fParticleChange; |
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114 | |
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115 | |
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116 | private: |
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117 | |
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118 | const G4Material* currentMaterial; |
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119 | const G4MaterialCutsCouple* currentCouple; |
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120 | size_t currentMaterialIndex; |
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121 | G4double currentTcut; |
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122 | G4double preStepKinEnergy; |
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123 | |
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124 | }; |
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125 | |
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126 | inline void G4AdjointAlongStepWeightCorrection::DefineMaterial( |
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127 | const G4MaterialCutsCouple* couple) |
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128 | { |
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129 | if(couple != currentCouple) { |
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130 | currentCouple = couple; |
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131 | currentMaterial = couple->GetMaterial(); |
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132 | currentMaterialIndex = couple->GetIndex(); |
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133 | |
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134 | } |
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135 | } |
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136 | |
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137 | |
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138 | |
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139 | #endif |
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