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: G4SynchrotronRadiationInMat.cc,v 1.2 2006/06/29 19:56:17 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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29 | // |
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30 | // -------------------------------------------------------------- |
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31 | // GEANT 4 class implementation file |
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32 | // CERN Geneva Switzerland |
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33 | // |
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34 | // History: first implementation, |
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35 | // 21-5-98 V.Grichine |
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36 | // 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation |
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37 | // 04.03.05, V.Grichine: get local field interface |
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38 | // 19-05-06, V.Ivanchenko rename from G4SynchrotronRadiation |
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39 | // |
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40 | // |
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41 | /////////////////////////////////////////////////////////////////////////// |
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42 | |
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43 | #include "G4SynchrotronRadiationInMat.hh" |
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44 | #include "G4Integrator.hh" |
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45 | |
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46 | using namespace std; |
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47 | |
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48 | //////////////////////////////////////////////////////////////////// |
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49 | // |
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50 | // Constant for calculation of mean free path |
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51 | // |
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52 | |
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53 | const G4double |
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54 | G4SynchrotronRadiationInMat::fLambdaConst = sqrt(3.0)*electron_mass_c2/ |
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55 | (2.5*fine_structure_const*eplus*c_light) ; |
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56 | |
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57 | ///////////////////////////////////////////////////////////////////// |
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58 | // |
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59 | // Constant for calculation of characterictic energy |
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60 | // |
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61 | |
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62 | const G4double |
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63 | G4SynchrotronRadiationInMat::fEnergyConst = 1.5*c_light*c_light*eplus*hbar_Planck/ |
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64 | electron_mass_c2 ; |
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65 | |
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66 | //////////////////////////////////////////////////////////////////// |
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67 | // |
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68 | // Array of integral probability of synchrotron photons: |
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69 | // |
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70 | // the corresponding energy = 0.0001*i*i*(characteristic energy) |
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71 | // |
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72 | |
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73 | const G4double |
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74 | G4SynchrotronRadiationInMat::fIntegralProbabilityOfSR[200] = |
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75 | { |
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76 | 1.000000e+00, 9.428859e-01, 9.094095e-01, 8.813971e-01, 8.565154e-01, |
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77 | 8.337008e-01, 8.124961e-01, 7.925217e-01, 7.735517e-01, 7.554561e-01, |
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78 | 7.381233e-01, 7.214521e-01, 7.053634e-01, 6.898006e-01, 6.747219e-01, |
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79 | 6.600922e-01, 6.458793e-01, 6.320533e-01, 6.185872e-01, 6.054579e-01, |
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80 | 5.926459e-01, 5.801347e-01, 5.679103e-01, 5.559604e-01, 5.442736e-01, |
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81 | 5.328395e-01, 5.216482e-01, 5.106904e-01, 4.999575e-01, 4.894415e-01, |
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82 | 4.791351e-01, 4.690316e-01, 4.591249e-01, 4.494094e-01, 4.398800e-01, |
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83 | 4.305320e-01, 4.213608e-01, 4.123623e-01, 4.035325e-01, 3.948676e-01, |
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84 | 3.863639e-01, 3.780179e-01, 3.698262e-01, 3.617858e-01, 3.538933e-01, |
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85 | 3.461460e-01, 3.385411e-01, 3.310757e-01, 3.237474e-01, 3.165536e-01, |
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86 | 3.094921e-01, 3.025605e-01, 2.957566e-01, 2.890784e-01, 2.825237e-01, |
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87 | 2.760907e-01, 2.697773e-01, 2.635817e-01, 2.575020e-01, 2.515365e-01, |
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88 | 2.456834e-01, 2.399409e-01, 2.343074e-01, 2.287812e-01, 2.233607e-01, |
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89 | 2.180442e-01, 2.128303e-01, 2.077174e-01, 2.027040e-01, 1.977885e-01, |
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90 | 1.929696e-01, 1.882457e-01, 1.836155e-01, 1.790775e-01, 1.746305e-01, |
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91 | 1.702730e-01, 1.660036e-01, 1.618212e-01, 1.577243e-01, 1.537117e-01, |
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92 | 1.497822e-01, 1.459344e-01, 1.421671e-01, 1.384791e-01, 1.348691e-01, |
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93 | 1.313360e-01, 1.278785e-01, 1.244956e-01, 1.211859e-01, 1.179483e-01, |
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94 | 1.147818e-01, 1.116850e-01, 1.086570e-01, 1.056966e-01, 1.028026e-01, |
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95 | 9.997405e-02, 9.720975e-02, 9.450865e-02, 9.186969e-02, 8.929179e-02, |
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96 | 8.677391e-02, 8.431501e-02, 8.191406e-02, 7.957003e-02, 7.728192e-02, |
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97 | 7.504872e-02, 7.286944e-02, 7.074311e-02, 6.866874e-02, 6.664538e-02, |
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98 | 6.467208e-02, 6.274790e-02, 6.087191e-02, 5.904317e-02, 5.726079e-02, |
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99 | 5.552387e-02, 5.383150e-02, 5.218282e-02, 5.057695e-02, 4.901302e-02, |
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100 | 4.749020e-02, 4.600763e-02, 4.456450e-02, 4.315997e-02, 4.179325e-02, |
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101 | 4.046353e-02, 3.917002e-02, 3.791195e-02, 3.668855e-02, 3.549906e-02, |
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102 | 3.434274e-02, 3.321884e-02, 3.212665e-02, 3.106544e-02, 3.003452e-02, |
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103 | 2.903319e-02, 2.806076e-02, 2.711656e-02, 2.619993e-02, 2.531021e-02, |
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104 | 2.444677e-02, 2.360897e-02, 2.279620e-02, 2.200783e-02, 2.124327e-02, |
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105 | 2.050194e-02, 1.978324e-02, 1.908662e-02, 1.841151e-02, 1.775735e-02, |
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106 | 1.712363e-02, 1.650979e-02, 1.591533e-02, 1.533973e-02, 1.478250e-02, |
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107 | 1.424314e-02, 1.372117e-02, 1.321613e-02, 1.272755e-02, 1.225498e-02, |
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108 | 1.179798e-02, 1.135611e-02, 1.092896e-02, 1.051609e-02, 1.011712e-02, |
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109 | 9.731635e-03, 9.359254e-03, 8.999595e-03, 8.652287e-03, 8.316967e-03, |
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110 | 7.993280e-03, 7.680879e-03, 7.379426e-03, 7.088591e-03, 6.808051e-03, |
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111 | 6.537491e-03, 6.276605e-03, 6.025092e-03, 5.782661e-03, 5.549027e-03, |
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112 | 5.323912e-03, 5.107045e-03, 4.898164e-03, 4.697011e-03, 4.503336e-03, |
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113 | 4.316896e-03, 4.137454e-03, 3.964780e-03, 3.798649e-03, 3.638843e-03, |
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114 | 3.485150e-03, 3.337364e-03, 3.195284e-03, 3.058715e-03, 2.927469e-03, |
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115 | 2.801361e-03, 2.680213e-03, 2.563852e-03, 2.452110e-03, 2.344824e-03 |
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116 | }; |
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117 | |
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118 | /////////////////////////////////////////////////////////////////////// |
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119 | // |
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120 | // Constructor |
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121 | // |
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122 | |
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123 | G4SynchrotronRadiationInMat::G4SynchrotronRadiationInMat(const G4String& processName, |
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124 | G4ProcessType type):G4VDiscreteProcess (processName, type), |
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125 | LowestKineticEnergy (10.*keV), |
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126 | HighestKineticEnergy (100.*TeV), |
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127 | TotBin(200), |
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128 | theGamma (G4Gamma::Gamma() ), |
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129 | theElectron ( G4Electron::Electron() ), |
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130 | thePositron ( G4Positron::Positron() ), fAlpha(0.0), fRootNumber(80), |
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131 | fVerboseLevel( verboseLevel ) |
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132 | { |
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133 | G4TransportationManager* transportMgr = G4TransportationManager::GetTransportationManager(); |
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134 | |
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135 | fFieldPropagator = transportMgr->GetPropagatorInField(); |
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136 | |
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137 | } |
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138 | |
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139 | ///////////////////////////////////////////////////////////////////////// |
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140 | // |
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141 | // Destructor |
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142 | // |
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143 | |
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144 | G4SynchrotronRadiationInMat::~G4SynchrotronRadiationInMat() |
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145 | { |
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146 | ; |
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147 | } |
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148 | |
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149 | |
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150 | /////////////////////////////// METHODS ///////////////////////////////// |
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151 | // |
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152 | // |
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153 | // Production of synchrotron X-ray photon |
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154 | // GEANT4 internal units. |
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155 | // |
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156 | |
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157 | |
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158 | G4double |
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159 | G4SynchrotronRadiationInMat::GetMeanFreePath( const G4Track& trackData, |
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160 | G4double, |
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161 | G4ForceCondition* condition) |
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162 | { |
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163 | // gives the MeanFreePath in GEANT4 internal units |
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164 | G4double MeanFreePath; |
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165 | |
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166 | const G4DynamicParticle* aDynamicParticle = trackData.GetDynamicParticle(); |
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167 | // G4Material* aMaterial = trackData.GetMaterial(); |
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168 | |
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169 | //G4bool isOutRange ; |
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170 | |
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171 | *condition = NotForced ; |
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172 | |
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173 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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174 | aDynamicParticle->GetMass(); |
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175 | |
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176 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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177 | |
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178 | G4double KineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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179 | |
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180 | if ( KineticEnergy < LowestKineticEnergy || gamma < 1.0e3 ) MeanFreePath = DBL_MAX; |
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181 | else |
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182 | { |
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183 | |
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184 | G4ThreeVector FieldValue; |
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185 | const G4Field* pField = 0; |
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186 | |
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187 | G4FieldManager* fieldMgr=0; |
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188 | G4bool fieldExertsForce = false; |
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189 | |
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190 | if( (particleCharge != 0.0) ) |
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191 | { |
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192 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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193 | |
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194 | if ( fieldMgr != 0 ) |
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195 | { |
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196 | // If the field manager has no field, there is no field ! |
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197 | |
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198 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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199 | } |
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200 | } |
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201 | if ( fieldExertsForce ) |
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202 | { |
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203 | pField = fieldMgr->GetDetectorField() ; |
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204 | G4ThreeVector globPosition = trackData.GetPosition(); |
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205 | |
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206 | G4double globPosVec[3], FieldValueVec[3]; |
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207 | |
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208 | globPosVec[0] = globPosition.x(); |
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209 | globPosVec[1] = globPosition.y(); |
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210 | globPosVec[2] = globPosition.z(); |
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211 | |
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212 | pField->GetFieldValue( globPosVec, FieldValueVec ); |
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213 | |
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214 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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215 | FieldValueVec[1], |
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216 | FieldValueVec[2] ); |
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217 | |
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218 | |
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219 | |
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220 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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221 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ; |
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222 | G4double perpB = unitMcrossB.mag() ; |
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223 | G4double beta = aDynamicParticle->GetTotalMomentum()/ |
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224 | (aDynamicParticle->GetTotalEnergy() ); |
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225 | |
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226 | if( perpB > 0.0 ) MeanFreePath = fLambdaConst*beta/perpB; |
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227 | else MeanFreePath = DBL_MAX; |
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228 | } |
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229 | else MeanFreePath = DBL_MAX; |
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230 | } |
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231 | if(fVerboseLevel > 0) |
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232 | { |
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233 | G4cout<<"G4SynchrotronRadiationInMat::MeanFreePath = "<<MeanFreePath/m<<" m"<<G4endl; |
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234 | } |
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235 | return MeanFreePath; |
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236 | } |
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237 | |
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238 | //////////////////////////////////////////////////////////////////////////////// |
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239 | // |
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240 | // |
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241 | |
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242 | G4VParticleChange* |
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243 | G4SynchrotronRadiationInMat::PostStepDoIt(const G4Track& trackData, |
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244 | const G4Step& stepData ) |
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245 | |
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246 | { |
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247 | aParticleChange.Initialize(trackData); |
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248 | |
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249 | const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle(); |
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250 | |
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251 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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252 | (aDynamicParticle->GetMass() ); |
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253 | |
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254 | if(gamma <= 1.0e3 ) |
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255 | { |
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256 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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257 | } |
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258 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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259 | |
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260 | G4ThreeVector FieldValue; |
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261 | const G4Field* pField = 0 ; |
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262 | |
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263 | G4FieldManager* fieldMgr=0; |
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264 | G4bool fieldExertsForce = false; |
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265 | |
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266 | if( (particleCharge != 0.0) ) |
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267 | { |
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268 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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269 | if ( fieldMgr != 0 ) |
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270 | { |
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271 | // If the field manager has no field, there is no field ! |
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272 | |
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273 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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274 | } |
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275 | } |
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276 | if ( fieldExertsForce ) |
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277 | { |
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278 | pField = fieldMgr->GetDetectorField() ; |
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279 | G4ThreeVector globPosition = trackData.GetPosition() ; |
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280 | G4double globPosVec[3], FieldValueVec[3] ; |
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281 | globPosVec[0] = globPosition.x() ; |
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282 | globPosVec[1] = globPosition.y() ; |
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283 | globPosVec[2] = globPosition.z() ; |
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284 | |
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285 | pField->GetFieldValue( globPosVec, FieldValueVec ) ; |
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286 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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287 | FieldValueVec[1], |
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288 | FieldValueVec[2] ); |
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289 | |
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290 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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291 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum); |
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292 | G4double perpB = unitMcrossB.mag() ; |
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293 | if(perpB > 0.0) |
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294 | { |
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295 | // M-C of synchrotron photon energy |
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296 | |
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297 | G4double energyOfSR = GetRandomEnergySR(gamma,perpB); |
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298 | |
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299 | if(fVerboseLevel > 0) |
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300 | { |
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301 | G4cout<<"SR photon energy = "<<energyOfSR/keV<<" keV"<<G4endl; |
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302 | } |
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303 | // check against insufficient energy |
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304 | |
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305 | if( energyOfSR <= 0.0 ) |
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306 | { |
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307 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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308 | } |
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309 | G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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310 | G4ParticleMomentum |
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311 | particleDirection = aDynamicParticle->GetMomentumDirection(); |
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312 | |
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313 | // M-C of its direction |
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314 | |
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315 | G4double Teta = G4UniformRand()/gamma ; // Very roughly |
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316 | |
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317 | G4double Phi = twopi * G4UniformRand() ; |
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318 | |
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319 | G4double dirx = sin(Teta)*cos(Phi) , |
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320 | diry = sin(Teta)*sin(Phi) , |
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321 | dirz = cos(Teta) ; |
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322 | |
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323 | G4ThreeVector gammaDirection ( dirx, diry, dirz); |
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324 | gammaDirection.rotateUz(particleDirection); |
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325 | |
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326 | // polarization of new gamma |
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327 | |
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328 | // G4double sx = cos(Teta)*cos(Phi); |
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329 | // G4double sy = cos(Teta)*sin(Phi); |
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330 | // G4double sz = -sin(Teta); |
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331 | |
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332 | G4ThreeVector gammaPolarization = FieldValue.cross(gammaDirection); |
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333 | gammaPolarization = gammaPolarization.unit(); |
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334 | |
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335 | // (sx, sy, sz); |
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336 | // gammaPolarization.rotateUz(particleDirection); |
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337 | |
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338 | // create G4DynamicParticle object for the SR photon |
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339 | |
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340 | G4DynamicParticle* aGamma= new G4DynamicParticle ( G4Gamma::Gamma(), |
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341 | gammaDirection, |
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342 | energyOfSR ); |
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343 | aGamma->SetPolarization( gammaPolarization.x(), |
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344 | gammaPolarization.y(), |
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345 | gammaPolarization.z() ); |
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346 | |
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347 | |
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348 | aParticleChange.SetNumberOfSecondaries(1); |
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349 | aParticleChange.AddSecondary(aGamma); |
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350 | |
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351 | // Update the incident particle |
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352 | |
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353 | G4double newKinEnergy = kineticEnergy - energyOfSR ; |
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354 | |
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355 | if (newKinEnergy > 0.) |
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356 | { |
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357 | aParticleChange.ProposeMomentumDirection( particleDirection ); |
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358 | aParticleChange.ProposeEnergy( newKinEnergy ); |
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359 | aParticleChange.ProposeLocalEnergyDeposit (0.); |
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360 | } |
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361 | else |
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362 | { |
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363 | aParticleChange.ProposeEnergy( 0. ); |
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364 | aParticleChange.ProposeLocalEnergyDeposit (0.); |
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365 | G4double charge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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366 | if (charge<0.) |
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367 | { |
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368 | aParticleChange.ProposeTrackStatus(fStopAndKill) ; |
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369 | } |
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370 | else |
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371 | { |
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372 | aParticleChange.ProposeTrackStatus(fStopButAlive) ; |
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373 | } |
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374 | } |
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375 | } |
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376 | else |
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377 | { |
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378 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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379 | } |
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380 | } |
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381 | return G4VDiscreteProcess::PostStepDoIt(trackData,stepData); |
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382 | } |
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383 | |
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384 | |
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385 | G4double |
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386 | G4SynchrotronRadiationInMat::GetPhotonEnergy( const G4Track& trackData, |
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387 | const G4Step& ) |
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388 | |
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389 | { |
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390 | G4int i ; |
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391 | G4double energyOfSR = -1.0 ; |
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392 | //G4Material* aMaterial=trackData.GetMaterial() ; |
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393 | |
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394 | const G4DynamicParticle* aDynamicParticle=trackData.GetDynamicParticle(); |
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395 | |
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396 | G4double gamma = aDynamicParticle->GetTotalEnergy()/ |
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397 | (aDynamicParticle->GetMass() ) ; |
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398 | |
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399 | G4double particleCharge = aDynamicParticle->GetDefinition()->GetPDGCharge(); |
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400 | |
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401 | G4ThreeVector FieldValue; |
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402 | const G4Field* pField = 0 ; |
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403 | |
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404 | G4FieldManager* fieldMgr=0; |
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405 | G4bool fieldExertsForce = false; |
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406 | |
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407 | if( (particleCharge != 0.0) ) |
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408 | { |
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409 | fieldMgr = fFieldPropagator->FindAndSetFieldManager( trackData.GetVolume() ); |
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410 | if ( fieldMgr != 0 ) |
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411 | { |
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412 | // If the field manager has no field, there is no field ! |
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413 | |
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414 | fieldExertsForce = ( fieldMgr->GetDetectorField() != 0 ); |
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415 | } |
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416 | } |
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417 | if ( fieldExertsForce ) |
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418 | { |
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419 | pField = fieldMgr->GetDetectorField(); |
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420 | G4ThreeVector globPosition = trackData.GetPosition(); |
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421 | G4double globPosVec[3], FieldValueVec[3]; |
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422 | |
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423 | globPosVec[0] = globPosition.x(); |
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424 | globPosVec[1] = globPosition.y(); |
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425 | globPosVec[2] = globPosition.z(); |
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426 | |
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427 | pField->GetFieldValue( globPosVec, FieldValueVec ); |
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428 | FieldValue = G4ThreeVector( FieldValueVec[0], |
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429 | FieldValueVec[1], |
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430 | FieldValueVec[2] ); |
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431 | |
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432 | G4ThreeVector unitMomentum = aDynamicParticle->GetMomentumDirection(); |
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433 | G4ThreeVector unitMcrossB = FieldValue.cross(unitMomentum) ; |
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434 | G4double perpB = unitMcrossB.mag(); |
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435 | if( perpB > 0.0 ) |
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436 | { |
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437 | // M-C of synchrotron photon energy |
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438 | |
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439 | G4double random = G4UniformRand() ; |
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440 | for(i=0;i<200;i++) |
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441 | { |
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442 | if(random >= fIntegralProbabilityOfSR[i]) break ; |
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443 | } |
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444 | energyOfSR = 0.0001*i*i*fEnergyConst*gamma*gamma*perpB ; |
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445 | |
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446 | // check against insufficient energy |
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447 | |
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448 | if(energyOfSR <= 0.0) |
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449 | { |
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450 | return -1.0 ; |
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451 | } |
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452 | //G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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453 | //G4ParticleMomentum |
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454 | //particleDirection = aDynamicParticle->GetMomentumDirection(); |
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455 | |
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456 | // Gamma production cut in this material |
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457 | //G4double |
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458 | //gammaEnergyCut = (G4Gamma::GetCutsInEnergy())[aMaterial->GetIndex()]; |
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459 | |
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460 | // SR photon has energy more than the current material cut |
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461 | // M-C of its direction |
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462 | |
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463 | //G4double Teta = G4UniformRand()/gamma ; // Very roughly |
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464 | |
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465 | //G4double Phi = twopi * G4UniformRand() ; |
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466 | } |
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467 | else |
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468 | { |
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469 | return -1.0 ; |
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470 | } |
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471 | } |
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472 | return energyOfSR ; |
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473 | } |
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474 | |
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475 | ///////////////////////////////////////////////////////////////////////////////// |
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476 | // |
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477 | // |
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478 | |
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479 | G4double G4SynchrotronRadiationInMat::GetRandomEnergySR(G4double gamma, G4double perpB) |
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480 | { |
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481 | G4int i, iMax; |
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482 | G4double energySR, random, position; |
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483 | |
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484 | iMax = 200; |
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485 | random = G4UniformRand(); |
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486 | |
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487 | for( i = 0; i < iMax; i++ ) |
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488 | { |
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489 | if( random >= fIntegralProbabilityOfSR[i] ) break; |
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490 | } |
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491 | if(i <= 0 ) position = G4UniformRand(); // 0. |
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492 | else if( i>= iMax) position = G4double(iMax); |
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493 | else position = i + G4UniformRand(); // -1 |
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494 | // |
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495 | // it was in initial implementation: |
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496 | // energyOfSR = 0.0001*i*i*fEnergyConst*gamma*gamma*perpB ; |
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497 | |
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498 | energySR = 0.0001*position*position*fEnergyConst*gamma*gamma*perpB; |
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499 | |
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500 | if( energySR < 0. ) energySR = 0.; |
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501 | |
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502 | return energySR; |
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503 | } |
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504 | |
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505 | ///////////////////////////////////////////////////////////////////////// |
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506 | // |
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507 | // return |
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508 | |
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509 | G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt( G4double t) |
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510 | { |
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511 | G4double result, hypCos2, hypCos=std::cosh(t); |
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512 | |
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513 | hypCos2 = hypCos*hypCos; |
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514 | result = std::cosh(5.*t/3.)*std::exp(t-fKsi*hypCos); // fKsi > 0. ! |
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515 | result /= hypCos2; |
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516 | return result; |
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517 | } |
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518 | |
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519 | /////////////////////////////////////////////////////////////////////////// |
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520 | // |
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521 | // return the probability to emit SR photon with relative energy |
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522 | // energy/energy_c >= ksi |
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523 | // for ksi <= 0. P = 1., however the method works for ksi > 0 only! |
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524 | |
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525 | G4double G4SynchrotronRadiationInMat::GetIntProbSR( G4double ksi) |
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526 | { |
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527 | if (ksi <= 0.) return 1.0; |
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528 | fKsi = ksi; // should be > 0. ! |
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529 | G4int n; |
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530 | G4double result, a; |
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531 | |
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532 | a = fAlpha; // always = 0. |
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533 | n = fRootNumber; // around default = 80 |
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534 | |
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535 | G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral; |
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536 | |
---|
537 | result = integral.Laguerre(this, |
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538 | &G4SynchrotronRadiationInMat::GetProbSpectrumSRforInt, a, n); |
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539 | |
---|
540 | result *= 3./5./pi; |
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541 | |
---|
542 | return result; |
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543 | } |
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544 | |
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545 | ///////////////////////////////////////////////////////////////////////// |
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546 | // |
---|
547 | // return an auxiliary function for K_5/3 integral representation |
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548 | |
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549 | G4double G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy( G4double t) |
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550 | { |
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551 | G4double result, hypCos=std::cosh(t); |
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552 | |
---|
553 | result = std::cosh(5.*t/3.)*std::exp(t - fKsi*hypCos); // fKsi > 0. ! |
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554 | result /= hypCos; |
---|
555 | return result; |
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556 | } |
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557 | |
---|
558 | /////////////////////////////////////////////////////////////////////////// |
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559 | // |
---|
560 | // return the probability to emit SR photon energy with relative energy |
---|
561 | // energy/energy_c >= ksi |
---|
562 | // for ksi <= 0. P = 1., however the method works for ksi > 0 only! |
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563 | |
---|
564 | G4double G4SynchrotronRadiationInMat::GetEnergyProbSR( G4double ksi) |
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565 | { |
---|
566 | if (ksi <= 0.) return 1.0; |
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567 | fKsi = ksi; // should be > 0. ! |
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568 | G4int n; |
---|
569 | G4double result, a; |
---|
570 | |
---|
571 | a = fAlpha; // always = 0. |
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572 | n = fRootNumber; // around default = 80 |
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573 | |
---|
574 | G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral; |
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575 | |
---|
576 | result = integral.Laguerre(this, |
---|
577 | &G4SynchrotronRadiationInMat::GetProbSpectrumSRforEnergy, a, n); |
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578 | |
---|
579 | result *= 9.*std::sqrt(3.)*ksi/8./pi; |
---|
580 | |
---|
581 | return result; |
---|
582 | } |
---|
583 | |
---|
584 | ///////////////////////////////////////////////////////////////////////////// |
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585 | // |
---|
586 | // |
---|
587 | |
---|
588 | G4double G4SynchrotronRadiationInMat::GetIntegrandForAngleK( G4double t) |
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589 | { |
---|
590 | G4double result, hypCos=std::cosh(t); |
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591 | |
---|
592 | result = std::cosh(fOrderAngleK*t)*std::exp(t - fEta*hypCos); // fEta > 0. ! |
---|
593 | result /= hypCos; |
---|
594 | return result; |
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595 | } |
---|
596 | |
---|
597 | ////////////////////////////////////////////////////////////////////////// |
---|
598 | // |
---|
599 | // Return K 1/3 or 2/3 for angular distribution |
---|
600 | |
---|
601 | G4double G4SynchrotronRadiationInMat::GetAngleK( G4double eta) |
---|
602 | { |
---|
603 | fEta = eta; // should be > 0. ! |
---|
604 | G4int n; |
---|
605 | G4double result, a; |
---|
606 | |
---|
607 | a = fAlpha; // always = 0. |
---|
608 | n = fRootNumber; // around default = 80 |
---|
609 | |
---|
610 | G4Integrator<G4SynchrotronRadiationInMat, G4double(G4SynchrotronRadiationInMat::*)(G4double)> integral; |
---|
611 | |
---|
612 | result = integral.Laguerre(this, |
---|
613 | &G4SynchrotronRadiationInMat::GetIntegrandForAngleK, a, n); |
---|
614 | |
---|
615 | return result; |
---|
616 | } |
---|
617 | |
---|
618 | ///////////////////////////////////////////////////////////////////////// |
---|
619 | // |
---|
620 | // Relative angle diff distribution for given fKsi, which is set externally |
---|
621 | |
---|
622 | G4double G4SynchrotronRadiationInMat::GetAngleNumberAtGammaKsi( G4double gpsi) |
---|
623 | { |
---|
624 | G4double result, funK, funK2, gpsi2 = gpsi*gpsi; |
---|
625 | |
---|
626 | fPsiGamma = gpsi; |
---|
627 | fEta = 0.5*fKsi*(1 + gpsi2)*std::sqrt(1 + gpsi2); |
---|
628 | |
---|
629 | fOrderAngleK = 1./3.; |
---|
630 | funK = GetAngleK(fEta); |
---|
631 | funK2 = funK*funK; |
---|
632 | |
---|
633 | result = gpsi2*funK2/(1 + gpsi2); |
---|
634 | |
---|
635 | fOrderAngleK = 2./3.; |
---|
636 | funK = GetAngleK(fEta); |
---|
637 | funK2 = funK*funK; |
---|
638 | |
---|
639 | result += funK2; |
---|
640 | result *= (1 + gpsi2)*fKsi; |
---|
641 | |
---|
642 | return result; |
---|
643 | } |
---|
644 | |
---|
645 | |
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646 | ///////////////////// end of G4SynchrotronRadiationInMat.cc |
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647 | |
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