1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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9 | // * include a list of copyright holders. * |
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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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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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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: G4LivermoreBremsstrahlungModel.cc,v 1.6 2009/06/11 15:47:08 mantero Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | // Author: Luciano Pandola |
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30 | // |
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31 | // History: |
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32 | // -------- |
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33 | // 03 Mar 2009 L Pandola Migration from process to model |
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34 | // 12 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries: |
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35 | // - apply internal high-energy limit only in constructor |
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36 | // - do not apply low-energy limit (default is 0) |
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37 | // - added MinEnergyCut method |
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38 | // - do not change track status |
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39 | // - do not initialize element selectors |
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40 | // - use cut value from the interface |
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41 | // - fixed bug in sampling of angles between keV and MeV |
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42 | // 19 May 2009 L Pandola Explicitely set to zero pointers deleted in |
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43 | // Initialise(), since they might be checked later on |
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44 | // |
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45 | |
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46 | #include "G4LivermoreBremsstrahlungModel.hh" |
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47 | #include "G4ParticleDefinition.hh" |
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48 | #include "G4MaterialCutsCouple.hh" |
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49 | |
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50 | #include "G4DynamicParticle.hh" |
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51 | #include "G4Element.hh" |
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52 | #include "G4Gamma.hh" |
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53 | #include "G4Electron.hh" |
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54 | #include "G4SemiLogInterpolation.hh" |
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55 | // |
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56 | #include "G4VBremAngularDistribution.hh" |
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57 | #include "G4ModifiedTsai.hh" |
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58 | #include "G4Generator2BS.hh" |
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59 | #include "G4Generator2BN.hh" |
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60 | // |
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61 | #include "G4BremsstrahlungCrossSectionHandler.hh" |
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62 | // |
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63 | #include "G4VEnergySpectrum.hh" |
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64 | #include "G4eBremsstrahlungSpectrum.hh" |
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65 | |
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66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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67 | |
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68 | |
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69 | G4LivermoreBremsstrahlungModel::G4LivermoreBremsstrahlungModel(const G4ParticleDefinition*, |
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70 | const G4String& nam) |
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71 | :G4VEmModel(nam),isInitialised(false),crossSectionHandler(0), |
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72 | energySpectrum(0) |
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73 | { |
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74 | fIntrinsicLowEnergyLimit = 10.0*eV; |
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75 | fIntrinsicHighEnergyLimit = 100.0*GeV; |
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76 | fNBinEnergyLoss = 360; |
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77 | // SetLowEnergyLimit(fIntrinsicLowEnergyLimit); |
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78 | SetHighEnergyLimit(fIntrinsicHighEnergyLimit); |
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79 | // |
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80 | verboseLevel = 0; |
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81 | // |
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82 | generatorName = "tsai"; |
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83 | angularDistribution = new G4ModifiedTsai("TsaiGenerator"); //default generator |
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84 | // |
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85 | TsaiAngularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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86 | // |
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87 | } |
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88 | |
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89 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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90 | |
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91 | G4LivermoreBremsstrahlungModel::~G4LivermoreBremsstrahlungModel() |
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92 | { |
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93 | if (crossSectionHandler) delete crossSectionHandler; |
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94 | if (energySpectrum) delete energySpectrum; |
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95 | energyBins.clear(); |
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96 | delete angularDistribution; |
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97 | delete TsaiAngularDistribution; |
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98 | } |
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99 | |
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100 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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101 | |
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102 | void G4LivermoreBremsstrahlungModel::Initialise(const G4ParticleDefinition* particle, |
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103 | const G4DataVector& cuts) |
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104 | { |
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105 | //Check that the Livermore Bremsstrahlung is NOT attached to e+ |
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106 | if (particle != G4Electron::Electron()) |
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107 | { |
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108 | G4cout << "ERROR: Livermore Bremsstrahlung Model is applicable only to electrons" |
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109 | << G4endl; |
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110 | G4cout << "It cannot be registered to " << particle->GetParticleName() << G4endl; |
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111 | G4Exception(); |
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112 | } |
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113 | //Prepare energy spectrum |
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114 | if (energySpectrum) |
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115 | { |
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116 | delete energySpectrum; |
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117 | energySpectrum = 0; |
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118 | } |
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119 | |
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120 | energyBins.clear(); |
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121 | for(size_t i=0; i<15; i++) |
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122 | { |
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123 | G4double x = 0.1*((G4double)i); |
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124 | if(i == 0) x = 0.01; |
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125 | if(i == 10) x = 0.95; |
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126 | if(i == 11) x = 0.97; |
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127 | if(i == 12) x = 0.99; |
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128 | if(i == 13) x = 0.995; |
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129 | if(i == 14) x = 1.0; |
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130 | energyBins.push_back(x); |
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131 | } |
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132 | const G4String dataName("/brem/br-sp.dat"); |
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133 | energySpectrum = new G4eBremsstrahlungSpectrum(energyBins,dataName); |
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134 | |
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135 | if (verboseLevel > 0) |
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136 | G4cout << "G4eBremsstrahlungSpectrum is initialized" << G4endl; |
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137 | |
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138 | //Initialize cross section handler |
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139 | if (crossSectionHandler) |
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140 | { |
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141 | delete crossSectionHandler; |
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142 | crossSectionHandler = 0; |
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143 | } |
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144 | G4VDataSetAlgorithm* interpolation = new G4SemiLogInterpolation(); |
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145 | crossSectionHandler = new G4BremsstrahlungCrossSectionHandler(energySpectrum,interpolation); |
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146 | crossSectionHandler->Initialise(0,LowEnergyLimit(),HighEnergyLimit(), |
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147 | fNBinEnergyLoss); |
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148 | crossSectionHandler->Clear(); |
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149 | crossSectionHandler->LoadShellData("brem/br-cs-"); |
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150 | //This is used to retrieve cross section values later on |
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151 | crossSectionHandler->BuildMeanFreePathForMaterials(&cuts); |
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152 | |
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153 | if (verboseLevel > 0) |
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154 | { |
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155 | G4cout << "Livermore Bremsstrahlung model is initialized " << G4endl |
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156 | << "Energy range: " |
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157 | << LowEnergyLimit() / keV << " keV - " |
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158 | << HighEnergyLimit() / GeV << " GeV" |
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159 | << G4endl; |
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160 | } |
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161 | |
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162 | if (verboseLevel > 1) |
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163 | { |
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164 | G4cout << "Cross section data: " << G4endl; |
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165 | crossSectionHandler->PrintData(); |
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166 | G4cout << "Parameters: " << G4endl; |
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167 | energySpectrum->PrintData(); |
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168 | } |
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169 | |
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170 | if(isInitialised) return; |
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171 | fParticleChange = GetParticleChangeForLoss(); |
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172 | isInitialised = true; |
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173 | } |
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174 | |
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175 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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176 | |
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177 | G4double G4LivermoreBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*, |
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178 | const G4MaterialCutsCouple*) |
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179 | { |
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180 | return 250.*eV; |
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181 | } |
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182 | |
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183 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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184 | |
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185 | G4double |
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186 | G4LivermoreBremsstrahlungModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
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187 | G4double energy, |
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188 | G4double Z, G4double, |
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189 | G4double cutEnergy, |
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190 | G4double) |
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191 | { |
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192 | G4int iZ = (G4int) Z; |
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193 | if (!crossSectionHandler) |
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194 | { |
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195 | G4cout << "G4LivermoreBremsstrahlungModel::ComputeCrossSectionPerAtom" << G4endl; |
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196 | G4cout << "The cross section handler is not correctly initialized" << G4endl; |
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197 | G4Exception(); |
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198 | } |
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199 | |
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200 | //The cut is already included in the crossSectionHandler |
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201 | G4double cs = |
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202 | crossSectionHandler->GetCrossSectionAboveThresholdForElement(energy,cutEnergy,iZ); |
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203 | |
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204 | if (verboseLevel > 1) |
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205 | { |
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206 | G4cout << "G4LivermoreBremsstrahlungModel " << G4endl; |
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207 | G4cout << "Cross section for gamma emission > " << cutEnergy/keV << " keV at " << |
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208 | energy/keV << " keV and Z = " << iZ << " --> " << cs/barn << " barn" << G4endl; |
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209 | } |
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210 | return cs; |
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211 | } |
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212 | |
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213 | |
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214 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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215 | |
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216 | G4double G4LivermoreBremsstrahlungModel::ComputeDEDXPerVolume(const G4Material* material, |
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217 | const G4ParticleDefinition* , |
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218 | G4double kineticEnergy, |
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219 | G4double cutEnergy) |
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220 | { |
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221 | G4double sPower = 0.0; |
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222 | |
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223 | const G4ElementVector* theElementVector = material->GetElementVector(); |
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224 | size_t NumberOfElements = material->GetNumberOfElements() ; |
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225 | const G4double* theAtomicNumDensityVector = |
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226 | material->GetAtomicNumDensityVector(); |
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227 | |
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228 | // loop for elements in the material |
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229 | for (size_t iel=0; iel<NumberOfElements; iel++ ) |
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230 | { |
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231 | G4int iZ = (G4int)((*theElementVector)[iel]->GetZ()); |
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232 | G4double e = energySpectrum->AverageEnergy(iZ, 0.0,cutEnergy, |
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233 | kineticEnergy); |
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234 | G4double cs= crossSectionHandler->FindValue(iZ,kineticEnergy); |
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235 | sPower += e * cs * theAtomicNumDensityVector[iel]; |
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236 | } |
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237 | |
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238 | if (verboseLevel > 2) |
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239 | { |
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240 | G4cout << "G4LivermoreBremsstrahlungModel " << G4endl; |
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241 | G4cout << "Stopping power < " << cutEnergy/keV << " keV at " << |
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242 | kineticEnergy/keV << " keV = " << sPower/(keV/mm) << " keV/mm" << G4endl; |
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243 | } |
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244 | |
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245 | return sPower; |
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246 | } |
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247 | |
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248 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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249 | |
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250 | void G4LivermoreBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
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251 | const G4MaterialCutsCouple* couple, |
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252 | const G4DynamicParticle* aDynamicParticle, |
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253 | G4double energyCut, |
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254 | G4double) |
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255 | { |
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256 | |
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257 | G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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258 | |
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259 | // this is neede for pathalogical cases of no ionisation |
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260 | if (kineticEnergy <= fIntrinsicLowEnergyLimit) |
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261 | { |
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262 | fParticleChange->SetProposedKineticEnergy(0.); |
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263 | fParticleChange->ProposeLocalEnergyDeposit(kineticEnergy); |
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264 | return; |
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265 | } |
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266 | |
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267 | //Sample material |
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268 | G4int Z = crossSectionHandler->SelectRandomAtom(couple, kineticEnergy); |
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269 | |
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270 | //Sample gamma energy |
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271 | G4double tGamma = energySpectrum->SampleEnergy(Z, energyCut, kineticEnergy, kineticEnergy); |
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272 | G4double totalEnergy = kineticEnergy + electron_mass_c2; |
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273 | G4double finalEnergy = kineticEnergy - tGamma; // electron final energy |
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274 | G4double theta = 0; |
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275 | |
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276 | if (tGamma == 0.) //nothing happens |
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277 | return; |
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278 | |
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279 | //Sample gamma direction |
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280 | //Use alternative algorithms, if it is the case. |
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281 | if((kineticEnergy < MeV && kineticEnergy > keV)) |
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282 | { |
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283 | theta = angularDistribution->PolarAngle(kineticEnergy,finalEnergy,Z); |
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284 | } |
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285 | else |
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286 | //Otherwise, use tsai |
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287 | { |
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288 | theta = TsaiAngularDistribution->PolarAngle(kineticEnergy,finalEnergy,Z); |
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289 | } |
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290 | |
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291 | G4double phi = twopi * G4UniformRand(); |
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292 | G4double dirZ = std::cos(theta); |
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293 | G4double sinTheta = std::sqrt(1. - dirZ*dirZ); |
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294 | G4double dirX = sinTheta*std::cos(phi); |
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295 | G4double dirY = sinTheta*std::sin(phi); |
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296 | |
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297 | G4ThreeVector gammaDirection (dirX, dirY, dirZ); |
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298 | G4ThreeVector electronDirection = aDynamicParticle->GetMomentumDirection(); |
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299 | |
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300 | //Update the incident particle |
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301 | gammaDirection.rotateUz(electronDirection); |
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302 | |
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303 | if (finalEnergy < 0.) |
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304 | { |
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305 | // Kinematic problem |
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306 | tGamma = kineticEnergy; |
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307 | fParticleChange->SetProposedKineticEnergy(0.); |
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308 | } |
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309 | else |
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310 | { |
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311 | G4double momentum = std::sqrt((totalEnergy + electron_mass_c2)*kineticEnergy); |
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312 | G4double finalX = momentum*electronDirection.x() - tGamma*gammaDirection.x(); |
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313 | G4double finalY = momentum*electronDirection.y() - tGamma*gammaDirection.y(); |
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314 | G4double finalZ = momentum*electronDirection.z() - tGamma*gammaDirection.z(); |
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315 | G4double norm = 1./std::sqrt(finalX*finalX + finalY*finalY + finalZ*finalZ); |
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316 | |
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317 | fParticleChange->ProposeMomentumDirection(finalX*norm, finalY*norm, finalZ*norm); |
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318 | fParticleChange->SetProposedKineticEnergy(finalEnergy); |
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319 | } |
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320 | |
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321 | //Generate the bremsstrahlung gamma |
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322 | G4DynamicParticle* aGamma= new G4DynamicParticle (G4Gamma::Gamma(), |
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323 | gammaDirection, tGamma); |
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324 | fvect->push_back(aGamma); |
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325 | |
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326 | if (verboseLevel > 1) |
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327 | { |
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328 | G4cout << "-----------------------------------------------------------" << G4endl; |
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329 | G4cout << "Energy balance from G4LivermoreBremsstrahlung" << G4endl; |
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330 | G4cout << "Incoming primary energy: " << kineticEnergy/keV << " keV" << G4endl; |
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331 | G4cout << "-----------------------------------------------------------" << G4endl; |
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332 | G4cout << "Outgoing primary energy: " << finalEnergy/keV << " keV" << G4endl; |
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333 | G4cout << "Gamma ray " << tGamma/keV << " keV" << G4endl; |
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334 | G4cout << "Total final state: " << (finalEnergy+tGamma)/keV << " keV" << G4endl; |
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335 | G4cout << "-----------------------------------------------------------" << G4endl; |
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336 | } |
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337 | if (verboseLevel > 0) |
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338 | { |
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339 | G4double energyDiff = std::fabs(finalEnergy+tGamma-kineticEnergy); |
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340 | if (energyDiff > 0.05*keV) |
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341 | G4cout << "G4LivermoreBremsstrahlung WARNING: problem with energy conservation: " |
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342 | << (finalEnergy+tGamma)/keV << " keV (final) vs. " |
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343 | << kineticEnergy/keV << " keV (initial)" << G4endl; |
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344 | } |
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345 | return; |
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346 | } |
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347 | |
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348 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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349 | |
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350 | void |
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351 | G4LivermoreBremsstrahlungModel::SetAngularGenerator(G4VBremAngularDistribution* distribution) |
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352 | { |
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353 | if(angularDistribution == distribution) return; |
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354 | if(angularDistribution) delete angularDistribution; |
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355 | angularDistribution = distribution; |
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356 | angularDistribution->PrintGeneratorInformation(); |
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357 | } |
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358 | |
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359 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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360 | |
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361 | void G4LivermoreBremsstrahlungModel::SetAngularGenerator(const G4String& name) |
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362 | { |
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363 | if(name == generatorName) return; |
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364 | if (name == "tsai") |
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365 | { |
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366 | delete angularDistribution; |
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367 | angularDistribution = new G4ModifiedTsai("TsaiGenerator"); |
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368 | generatorName = name; |
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369 | } |
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370 | else if (name == "2bn") |
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371 | { |
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372 | delete angularDistribution; |
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373 | angularDistribution = new G4Generator2BN("2BNGenerator"); |
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374 | generatorName = name; |
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375 | } |
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376 | else if (name == "2bs") |
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377 | { |
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378 | delete angularDistribution; |
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379 | angularDistribution = new G4Generator2BS("2BSGenerator"); |
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380 | generatorName = name; |
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381 | } |
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382 | else |
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383 | { |
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384 | G4cout << "### G4LivermoreBremsstrahlungModel::SetAngularGenerator WARNING:" |
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385 | << " generator <" << name << "> is not known" << G4endl; |
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386 | return; |
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387 | |
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388 | } |
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389 | |
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390 | angularDistribution->PrintGeneratorInformation(); |
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391 | } |
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