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 | // |
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28 | // GEANT4 Class header file |
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29 | // |
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30 | // |
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31 | // File name: G4PolarizedCompton |
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32 | // |
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33 | // Author: Andreas Schaelicke |
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34 | // based on code by Michel Maire / Vladimir IVANTCHENKO |
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35 | // Class description |
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36 | // |
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37 | // modified version respecting media and beam polarization |
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38 | // using the stokes formalism |
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39 | // |
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40 | // Creation date: 01.05.2005 |
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41 | // |
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42 | // Modifications: |
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43 | // |
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44 | // 01-01-05, include polarization description (A.Stahl) |
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45 | // 01-01-05, create asymmetry table and determine interactionlength (A.Stahl) |
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46 | // 01-05-05, update handling of media polarization (A.Schalicke) |
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47 | // 01-05-05, update polarized differential cross section (A.Schalicke) |
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48 | // 26-07-06, cross section recalculated (P.Starovoitov) |
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49 | // 09-08-06, make it work under current geant4 release (A.Schalicke) |
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50 | // 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke) |
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51 | // |
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52 | // ----------------------------------------------------------------------------- |
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53 | |
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54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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55 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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56 | |
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57 | #ifndef PolarizedComptonScattering_h |
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58 | #define PolarizedComptonScattering_h 1 |
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59 | |
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60 | #include "globals.hh" |
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61 | #include "G4VEmProcess.hh" |
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62 | #include "G4Gamma.hh" |
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63 | |
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64 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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65 | |
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66 | class G4ParticleDefinition; |
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67 | class G4VEmModel; |
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68 | class G4MaterialCutsCouple; |
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69 | class G4DynamicParticle; |
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70 | |
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71 | class G4PolarizedComptonModel; |
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72 | |
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73 | class G4PolarizedCompton : public G4VEmProcess |
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74 | |
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75 | { |
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76 | public: // with description |
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77 | |
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78 | G4PolarizedCompton(const G4String& processName ="pol-compt", |
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79 | G4ProcessType type = fElectromagnetic); |
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80 | |
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81 | virtual ~G4PolarizedCompton(); |
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82 | |
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83 | // true for Gamma only. |
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84 | G4bool IsApplicable(const G4ParticleDefinition&); |
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85 | |
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86 | // Print few lines of informations about the process: validity range, |
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87 | virtual void PrintInfo(); |
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88 | |
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89 | void SetModel(const G4String& name); |
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90 | |
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91 | protected: |
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92 | |
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93 | virtual void InitialiseProcess(const G4ParticleDefinition*); |
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94 | |
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95 | // added for polarization treatment of polarized media: |
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96 | virtual void BuildPhysicsTable(const G4ParticleDefinition&); |
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97 | virtual void PreparePhysicsTable(const G4ParticleDefinition&); |
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98 | void BuildAsymmetryTable(const G4ParticleDefinition& part); |
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99 | G4double ComputeAsymmetry(G4double energy, |
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100 | const G4MaterialCutsCouple* couple, |
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101 | const G4ParticleDefinition& particle, |
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102 | G4double cut, |
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103 | G4double & tAsymmetry); |
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104 | |
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105 | virtual G4double GetMeanFreePath(const G4Track& aTrack, |
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106 | G4double previousStepSize, |
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107 | G4ForceCondition* condition); |
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108 | virtual G4double PostStepGetPhysicalInteractionLength( |
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109 | const G4Track& track, |
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110 | G4double previousStepSize, |
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111 | G4ForceCondition* condition |
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112 | ); |
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113 | |
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114 | // can be removed as soon as G4PolarizationChangeForGamma is fixed! |
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115 | // virtual G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&); |
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116 | |
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117 | private: |
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118 | |
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119 | G4PolarizedCompton& operator=(const G4PolarizedCompton &right); |
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120 | G4PolarizedCompton(const G4PolarizedCompton& ); |
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121 | |
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122 | G4bool buildAsymmetryTable; |
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123 | G4bool useAsymmetryTable; |
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124 | |
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125 | G4bool isInitialised; |
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126 | G4VEmModel* selectedModel; |
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127 | G4int mType; |
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128 | |
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129 | // added for polarization treatment: |
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130 | G4PolarizedComptonModel* emModel; |
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131 | G4PhysicsTable* theAsymmetryTable; // table for crosssection assymmetry |
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132 | G4ThreeVector targetPolarization; |
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133 | }; |
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134 | |
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135 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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136 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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137 | |
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138 | inline G4bool G4PolarizedCompton::IsApplicable(const G4ParticleDefinition& p) |
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139 | { |
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140 | return (&p == G4Gamma::Gamma()); |
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141 | } |
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142 | |
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143 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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144 | |
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145 | #endif |
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146 | |
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