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2 | // ******************************************************************** |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4PenelopeBremsstrahlungModel.cc,v 1.8 2010/11/25 09:44:05 pandola Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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28 | // |
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29 | // Author: Luciano Pandola |
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30 | // -------- |
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31 | // 05 Dec 2008 L Pandola Migration from process to model |
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32 | // 25 Mar 2008 L Pandola Fixed .unit() call |
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33 | // 16 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries: |
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34 | // - apply internal high-energy limit only in constructor |
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35 | // - do not apply low-energy limit (default is 0) |
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36 | // - added MinEnergyCut method |
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37 | // - do not change track status |
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38 | // 14 May 2009 L Pandola Explicitely set to zero pointers deleted in |
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39 | // Initialise(), since they are checked later on |
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40 | // |
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41 | #include "G4PenelopeBremsstrahlungModel.hh" |
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42 | #include "G4PenelopeBremsstrahlungContinuous.hh" |
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43 | #include "G4PenelopeBremsstrahlungAngular.hh" |
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44 | #include "G4eBremsstrahlungSpectrum.hh" |
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45 | #include "G4CrossSectionHandler.hh" |
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46 | #include "G4VEMDataSet.hh" |
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47 | #include "G4DataVector.hh" |
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48 | #include "G4Positron.hh" |
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49 | #include "G4Electron.hh" |
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50 | #include "G4Gamma.hh" |
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51 | #include "G4MaterialCutsCouple.hh" |
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52 | #include "G4LogLogInterpolation.hh" |
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53 | |
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54 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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55 | |
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56 | G4PenelopeBremsstrahlungModel::G4PenelopeBremsstrahlungModel(const G4ParticleDefinition*, |
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57 | const G4String& nam) |
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58 | :G4VEmModel(nam),isInitialised(false),energySpectrum(0), |
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59 | angularData(0),stoppingPowerData(0),crossSectionHandler(0) |
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60 | { |
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61 | fIntrinsicLowEnergyLimit = 100.0*eV; |
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62 | fIntrinsicHighEnergyLimit = 100.0*GeV; |
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63 | // SetLowEnergyLimit(fIntrinsicLowEnergyLimit); |
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64 | SetHighEnergyLimit(fIntrinsicHighEnergyLimit); |
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65 | // |
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66 | |
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67 | verboseLevel= 0; |
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68 | |
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69 | // Verbosity scale: |
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70 | // 0 = nothing |
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71 | // 1 = warning for energy non-conservation |
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72 | // 2 = details of energy budget |
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73 | // 3 = calculation of cross sections, file openings, sampling of atoms |
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74 | // 4 = entering in methods |
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75 | |
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76 | //These vectors do not change when materials or cut change. |
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77 | //Therefore I can read it at the constructor |
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78 | angularData = new std::map<G4int,G4PenelopeBremsstrahlungAngular*>; |
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79 | |
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80 | //These data do not depend on materials and cuts. |
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81 | G4DataVector eBins; |
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82 | |
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83 | eBins.push_back(1.0e-12); |
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84 | eBins.push_back(0.05); |
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85 | eBins.push_back(0.075); |
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86 | eBins.push_back(0.1); |
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87 | eBins.push_back(0.125); |
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88 | eBins.push_back(0.15); |
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89 | eBins.push_back(0.2); |
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90 | eBins.push_back(0.25); |
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91 | eBins.push_back(0.3); |
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92 | eBins.push_back(0.35); |
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93 | eBins.push_back(0.40); |
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94 | eBins.push_back(0.45); |
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95 | eBins.push_back(0.50); |
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96 | eBins.push_back(0.55); |
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97 | eBins.push_back(0.60); |
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98 | eBins.push_back(0.65); |
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99 | eBins.push_back(0.70); |
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100 | eBins.push_back(0.75); |
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101 | eBins.push_back(0.80); |
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102 | eBins.push_back(0.85); |
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103 | eBins.push_back(0.90); |
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104 | eBins.push_back(0.925); |
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105 | eBins.push_back(0.95); |
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106 | eBins.push_back(0.97); |
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107 | eBins.push_back(0.99); |
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108 | eBins.push_back(0.995); |
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109 | eBins.push_back(0.999); |
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110 | eBins.push_back(0.9995); |
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111 | eBins.push_back(0.9999); |
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112 | eBins.push_back(0.99995); |
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113 | eBins.push_back(0.99999); |
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114 | eBins.push_back(1.0); |
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115 | |
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116 | const G4String dataName("/penelope/br-sp-pen.dat"); |
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117 | energySpectrum = new G4eBremsstrahlungSpectrum(eBins,dataName); |
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118 | } |
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119 | |
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120 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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121 | |
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122 | G4PenelopeBremsstrahlungModel::~G4PenelopeBremsstrahlungModel() |
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123 | { |
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124 | if (crossSectionHandler) |
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125 | delete crossSectionHandler; |
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126 | |
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127 | if (energySpectrum) |
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128 | delete energySpectrum; |
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129 | |
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130 | if (angularData) |
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131 | { |
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132 | std::map <G4int,G4PenelopeBremsstrahlungAngular*>::iterator i; |
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133 | for (i=angularData->begin();i != angularData->end();i++) |
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134 | if (i->second) delete i->second; |
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135 | delete angularData; |
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136 | } |
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137 | |
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138 | if (stoppingPowerData) |
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139 | { |
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140 | std::map <std::pair<G4int,G4double>,G4PenelopeBremsstrahlungContinuous*>::iterator j; |
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141 | for (j=stoppingPowerData->begin();j != stoppingPowerData->end();j++) |
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142 | if (j->second) delete j->second; |
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143 | delete stoppingPowerData; |
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144 | } |
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145 | } |
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146 | |
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147 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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148 | |
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149 | void G4PenelopeBremsstrahlungModel::Initialise(const G4ParticleDefinition* particle, |
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150 | const G4DataVector& cuts) |
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151 | { |
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152 | if (verboseLevel > 3) |
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153 | G4cout << "Calling G4PenelopeBremsstrahlungModel::Initialise()" << G4endl; |
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154 | |
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155 | // Delete everything, but angular data (do not depend on cuts) |
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156 | if (crossSectionHandler) |
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157 | { |
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158 | crossSectionHandler->Clear(); |
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159 | delete crossSectionHandler; |
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160 | crossSectionHandler = 0; |
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161 | } |
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162 | |
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163 | if (stoppingPowerData) |
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164 | { |
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165 | std::map <std::pair<G4int,G4double>,G4PenelopeBremsstrahlungContinuous*>::iterator j; |
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166 | for (j=stoppingPowerData->begin();j != stoppingPowerData->end();j++) |
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167 | if (j->second) |
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168 | { |
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169 | delete j->second; |
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170 | j->second = 0; |
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171 | } |
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172 | delete stoppingPowerData; |
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173 | stoppingPowerData = 0; |
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174 | } |
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175 | |
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176 | crossSectionHandler = new G4CrossSectionHandler(); |
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177 | crossSectionHandler->Clear(); |
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178 | // |
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179 | if (particle==G4Electron::Electron()) |
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180 | crossSectionHandler->LoadData("brem/br-cs-"); |
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181 | else |
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182 | crossSectionHandler->LoadData("penelope/br-cs-pos-"); //cross section for positrons |
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183 | |
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184 | //This is used to retrieve cross section values later on |
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185 | G4VEMDataSet* emdata = |
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186 | crossSectionHandler->BuildMeanFreePathForMaterials(); |
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187 | //The method BuildMeanFreePathForMaterials() is required here only to force |
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188 | //the building of an internal table: the output pointer can be deleted |
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189 | delete emdata; |
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190 | |
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191 | if (verboseLevel > 2) |
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192 | G4cout << "Loaded cross section files for PenelopeBremsstrahlungModel" << G4endl; |
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193 | |
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194 | if (verboseLevel > 0) { |
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195 | G4cout << "Penelope Bremsstrahlung model is initialized " << G4endl |
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196 | << "Energy range: " |
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197 | << LowEnergyLimit() / keV << " keV - " |
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198 | << HighEnergyLimit() / GeV << " GeV" |
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199 | << G4endl; |
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200 | } |
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201 | |
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202 | //This has to be invoked AFTER the crossSectionHandler has been created, |
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203 | //because it makes use of ComputeCrossSectionPerAtom() |
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204 | InitialiseElementSelectors(particle,cuts); |
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205 | |
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206 | if(isInitialised) return; |
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207 | fParticleChange = GetParticleChangeForLoss(); |
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208 | isInitialised = true; |
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209 | } |
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210 | |
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211 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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212 | |
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213 | G4double G4PenelopeBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*, |
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214 | const G4MaterialCutsCouple*) |
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215 | { |
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216 | return 250.*eV; |
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217 | } |
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218 | |
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219 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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220 | |
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221 | G4double G4PenelopeBremsstrahlungModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*, |
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222 | G4double kinEnergy, |
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223 | G4double Z, |
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224 | G4double, |
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225 | G4double cutEnergy, |
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226 | G4double) |
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227 | { |
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228 | // Penelope model to calculate cross section for hard bremsstrahlung emission |
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229 | // (gamma energy > cutEnergy). |
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230 | // |
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231 | // The total bremsstrahlung cross section is read from database, following data |
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232 | // reported in the EEDL library |
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233 | // D.E.Cullen et al., Report UCRL-50400 (Lawrence Livermore National Laboratory) (1989) |
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234 | // The probability to have photon emission above a given threshold is calculated |
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235 | // analytically using the differential cross section model dSigma/dW = F(x)/x, where |
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236 | // W is the outgoing photon energy and x = W/E is the ratio of the photon energy to the |
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237 | // incident energy. The function F(x) is tabulated (for all elements) using 32 points in x |
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238 | // ranging from 1e-12 to 1. Data are derived from |
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239 | // S.M.Seltzer and M.J.Berger, At.Data Nucl.Data Tables 35,345 (1986) |
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240 | // Differential cross sections for electrons and positrons dSigma/dW are assumed to scale |
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241 | // with a function S(Z,E) which does not depend on W; therefore, only overall cross section |
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242 | // changes but not the shape of the photon energy spectrum. |
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243 | // |
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244 | |
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245 | if (verboseLevel > 3) |
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246 | G4cout << "Calling ComputeCrossSectionPerAtom() of G4PenelopeBremsstrahlungModel" << G4endl; |
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247 | |
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248 | G4int iZ = (G4int) Z; |
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249 | |
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250 | // VI - not needed in run time |
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251 | // if (!crossSectionHandler) |
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252 | // { |
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253 | // G4cout << "G4PenelopeBremsstrahlungModel::ComputeCrossSectionPerAtom" << G4endl; |
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254 | // G4cout << "The cross section handler is not correctly initialized" << G4endl; |
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255 | // G4Exception(); |
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256 | // } |
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257 | G4double totalCs = crossSectionHandler->FindValue(iZ,kinEnergy); |
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258 | G4double cs = totalCs * energySpectrum->Probability(iZ,cutEnergy,kinEnergy,kinEnergy); |
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259 | |
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260 | if (verboseLevel > 2) |
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261 | { |
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262 | G4cout << "Bremsstrahlung cross section at " << kinEnergy/MeV << " MeV for Z=" << Z << |
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263 | " and energy > " << cutEnergy/keV << " keV --> " << cs/barn << " barn" << G4endl; |
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264 | G4cout << "Total bremsstrahlung cross section at " << kinEnergy/MeV << " MeV for Z=" << |
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265 | Z << " --> " << totalCs/barn << " barn" << G4endl; |
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266 | } |
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267 | return cs; |
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268 | |
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269 | } |
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270 | |
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271 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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272 | G4double |
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273 | G4PenelopeBremsstrahlungModel::ComputeDEDXPerVolume(const G4Material* theMaterial, |
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274 | const G4ParticleDefinition* theParticle, |
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275 | G4double kineticEnergy, |
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276 | G4double cutEnergy) |
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277 | { |
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278 | // Penelope model to calculate the stopping power (in [Energy]/[Length]) for soft |
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279 | // bremsstrahlung emission (gamma energy < cutEnergy). |
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280 | // |
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281 | // The actual calculation is performed by the helper class |
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282 | // G4PenelopeBremsstrahlungContinuous and its method CalculateStopping(). Notice: |
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283 | // CalculateStopping() gives the stopping cross section, namely the first momentum of |
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284 | // dSigma/dW, restricted to W < cut (W = gamma energy) This is dimensionally: |
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285 | // [Energy]*[Surface] |
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286 | // The calculation is performed by interpolation (in E = incident energy and |
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287 | // x=W/E) from the tabulated data derived from |
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288 | // M.J.Berger and S.M.Seltzer, Report NBSIR 82-2550 (National Bureau of Standards) (1982); |
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289 | // for electrons. |
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290 | // For positrons, dSigma/dW are assumed to scale with a function S(Z,E) with respect to electrons. |
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291 | // An analytical approximation for the scaling function S(Z,E) is given in |
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292 | // L.Kim et al., Phys.Rev.A 33,3002 (1986) |
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293 | // |
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294 | if (!stoppingPowerData) |
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295 | stoppingPowerData = new std::map<std::pair<G4int,G4double>, |
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296 | G4PenelopeBremsstrahlungContinuous*>; |
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297 | |
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298 | const G4ElementVector* theElementVector = theMaterial->GetElementVector(); |
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299 | const G4double* theAtomicNumDensityVector = theMaterial->GetAtomicNumDensityVector(); |
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300 | |
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301 | G4double sPower = 0.0; |
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302 | |
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303 | //Loop on the elements of the material |
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304 | for (size_t iel=0;iel<theMaterial->GetNumberOfElements();iel++) |
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305 | { |
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306 | G4int iZ = (G4int) ((*theElementVector)[iel]->GetZ()); |
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307 | G4PenelopeBremsstrahlungContinuous* theContinuousCalculator = |
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308 | GetStoppingPowerData(iZ,cutEnergy,theParticle); |
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309 | sPower += theContinuousCalculator->CalculateStopping(kineticEnergy)* |
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310 | theAtomicNumDensityVector[iel]; |
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311 | } |
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312 | |
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313 | if (verboseLevel > 2) |
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314 | { |
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315 | G4cout << "Bremsstrahlung stopping power at " << kineticEnergy/MeV |
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316 | << " MeV for material " << theMaterial->GetName() |
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317 | << " and energy < " << cutEnergy/keV << " keV --> " |
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318 | << sPower/(keV/mm) << " keV/mm" << G4endl; |
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319 | } |
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320 | |
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321 | return sPower; |
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322 | } |
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323 | |
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324 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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325 | |
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326 | void G4PenelopeBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
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327 | const G4MaterialCutsCouple* couple, |
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328 | const G4DynamicParticle* aDynamicParticle, |
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329 | G4double cutG,G4double) |
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330 | { |
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331 | // Penelope model to sample the final state for hard bremsstrahlung emission |
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332 | // (gamma energy < cutEnergy). |
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333 | // The energy distributionof the emitted photons is sampled according to the F(x) |
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334 | // function tabulated in the database from |
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335 | // S.M.Seltzer and M.J.Berger, At.Data Nucl.Data Tables 35,345 (1986) |
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336 | // The database contains the function F(x) (32 points) for 57 energies of the |
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337 | // incident electron between 1 keV and 100 GeV. For other primary energies, |
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338 | // logarithmic interpolation is used to obtain the values of the function F(x). |
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339 | // The double differential cross section dSigma/(dW dOmega), with W=photon energy, |
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340 | // is described as |
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341 | // dSigma/(dW dOmega) = dSigma/dW * p(Z,E,x,cosTheta) |
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342 | // where the shape function p depends on atomic number, incident energy and x=W/E. |
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343 | // Numerical values of the shape function, calculated by partial-waves methods, have been |
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344 | // reported in |
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345 | // L.Kissel et al., At.Data Nucl.Data.Tab. 28,381 (1983); |
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346 | // for Z=2,8,13,47,79 and 92; E=1,5,10,50,100 and 500 keV; x=0,0.6,0.8 and 0.95. The |
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347 | // function p(Z,E,x,cosTheta) is approximated by a Lorentz-dipole function as reported in |
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348 | // Penelope - A Code System for Monte Carlo Simulation of Electron and Photon Transport, |
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349 | // Workshop Proceedings Issy-les-Moulineaux, France, 5-7 November 2001, AEN-NEA; |
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350 | // The analytical function contains two adjustable parameters that are obtained by fitting |
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351 | // the complete solution from |
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352 | // L.Kissel et al., At.Data Nucl.Data.Tab. 28,381 (1983); |
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353 | // This allows the evaluation of p(Z,E,x,cosTheta) for any choice of Z, E and x. The actual |
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354 | // sampling of cos(theta) is performed in the helper class |
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355 | // G4PenelopeBremsstrahlungAngular, method ExtractCosTheta() |
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356 | // Energy and direction of the primary particle are updated according to energy-momentum |
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357 | // conservation. For positrons, it is sampled the same final state as for electrons. |
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358 | // |
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359 | if (verboseLevel > 3) |
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360 | G4cout << "Calling SampleSecondaries() of G4PenelopeBremsstrahlungModel" << G4endl; |
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361 | |
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362 | G4double kineticEnergy = aDynamicParticle->GetKineticEnergy(); |
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363 | const G4ParticleDefinition* theParticle = aDynamicParticle->GetDefinition(); |
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364 | |
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365 | if (kineticEnergy <= fIntrinsicLowEnergyLimit) |
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366 | { |
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367 | fParticleChange->SetProposedKineticEnergy(0.); |
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368 | fParticleChange->ProposeLocalEnergyDeposit(kineticEnergy); |
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369 | return ; |
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370 | } |
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371 | |
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372 | G4ParticleMomentum particleDirection0 = aDynamicParticle->GetMomentumDirection(); |
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373 | //This is the momentum |
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374 | G4ThreeVector initialMomentum = aDynamicParticle->GetMomentum(); |
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375 | |
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376 | //One can use Vladimir's selector! |
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377 | if (verboseLevel > 2) |
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378 | G4cout << "Going to select element in " << couple->GetMaterial()->GetName() << G4endl; |
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379 | // atom can be selected effitiantly if element selectors are initialised |
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380 | const G4Element* anElement = SelectRandomAtom(couple,theParticle,kineticEnergy); |
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381 | G4int iZ = (G4int) anElement->GetZ(); |
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382 | if (verboseLevel > 2) |
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383 | G4cout << "Selected " << anElement->GetName() << G4endl; |
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384 | // |
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385 | |
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386 | //Sample gamma's energy according to the spectrum |
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387 | G4double gammaEnergy = energySpectrum->SampleEnergy(iZ,cutG,kineticEnergy,kineticEnergy); |
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388 | |
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389 | //Now sample cosTheta for the Gamma |
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390 | G4double cosThetaPrimary = GetAngularDataForZ(iZ)->ExtractCosTheta(kineticEnergy,gammaEnergy); |
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391 | |
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392 | G4double residualPrimaryEnergy = kineticEnergy-gammaEnergy; |
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393 | if (residualPrimaryEnergy < 0) |
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394 | { |
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395 | //Ok we have a problem, all energy goes with the gamma |
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396 | gammaEnergy += residualPrimaryEnergy; |
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397 | residualPrimaryEnergy = 0.0; |
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398 | } |
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399 | |
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400 | //Get primary kinematics |
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401 | G4double sinTheta = std::sqrt(1. - cosThetaPrimary*cosThetaPrimary); |
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402 | G4double phi = twopi * G4UniformRand(); |
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403 | G4ThreeVector gammaDirection1(sinTheta* std::cos(phi), |
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404 | sinTheta* std::sin(phi), |
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405 | cosThetaPrimary); |
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406 | |
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407 | gammaDirection1.rotateUz(particleDirection0); |
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408 | |
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409 | //Produce final state according to momentum conservation |
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410 | G4ThreeVector particleDirection1 = initialMomentum - gammaEnergy*gammaDirection1; |
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411 | particleDirection1 = particleDirection1.unit(); //normalize |
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412 | |
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413 | //Update the primary particle |
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414 | if (residualPrimaryEnergy > 0.) |
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415 | { |
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416 | fParticleChange->ProposeMomentumDirection(particleDirection1); |
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417 | fParticleChange->SetProposedKineticEnergy(residualPrimaryEnergy); |
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418 | } |
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419 | else |
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420 | { |
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421 | fParticleChange->SetProposedKineticEnergy(0.); |
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422 | } |
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423 | |
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424 | //Now produce the photon |
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425 | G4DynamicParticle* theGamma = new G4DynamicParticle(G4Gamma::Gamma(), |
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426 | gammaDirection1, |
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427 | gammaEnergy); |
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428 | fvect->push_back(theGamma); |
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429 | |
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430 | if (verboseLevel > 1) |
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431 | { |
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432 | G4cout << "-----------------------------------------------------------" << G4endl; |
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433 | G4cout << "Energy balance from G4PenelopeBremsstrahlung" << G4endl; |
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434 | G4cout << "Incoming primary energy: " << kineticEnergy/keV << " keV" << G4endl; |
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435 | G4cout << "-----------------------------------------------------------" << G4endl; |
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436 | G4cout << "Outgoing primary energy: " << residualPrimaryEnergy/keV << " keV" << G4endl; |
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437 | G4cout << "Bremsstrahlung photon " << gammaEnergy/keV << " keV" << G4endl; |
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438 | G4cout << "Total final state: " << (residualPrimaryEnergy+gammaEnergy)/keV |
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439 | << " keV" << G4endl; |
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440 | G4cout << "-----------------------------------------------------------" << G4endl; |
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441 | } |
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442 | if (verboseLevel > 0) |
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443 | { |
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444 | G4double energyDiff = std::fabs(residualPrimaryEnergy+gammaEnergy-kineticEnergy); |
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445 | if (energyDiff > 0.05*keV) |
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446 | G4cout << "Warning from G4PenelopeBremsstrahlung: problem with energy conservation: " << |
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447 | (residualPrimaryEnergy+gammaEnergy)/keV << |
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448 | " keV (final) vs. " << |
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449 | kineticEnergy/keV << " keV (initial)" << G4endl; |
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450 | } |
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451 | } |
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452 | |
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453 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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454 | |
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455 | G4PenelopeBremsstrahlungAngular* G4PenelopeBremsstrahlungModel::GetAngularDataForZ(G4int iZ) |
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456 | { |
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457 | if (!angularData) |
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458 | angularData = new std::map<G4int,G4PenelopeBremsstrahlungAngular*>; |
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459 | |
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460 | if (angularData->count(iZ)) //the material already exists |
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461 | return angularData->find(iZ)->second; |
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462 | |
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463 | //Otherwise create a new object, store it and return it |
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464 | G4PenelopeBremsstrahlungAngular* theAngular = new G4PenelopeBremsstrahlungAngular(iZ); |
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465 | angularData->insert(std::make_pair(iZ,theAngular)); |
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466 | |
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467 | if (angularData->count(iZ)) //the material should exist now |
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468 | return angularData->find(iZ)->second; |
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469 | else |
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470 | { |
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471 | G4Exception("Problem in G4PenelopeBremsstrahlungModel::GetAngularDataForZ()"); |
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472 | return 0; |
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473 | } |
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474 | } |
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475 | |
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476 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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477 | |
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478 | G4PenelopeBremsstrahlungContinuous* |
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479 | G4PenelopeBremsstrahlungModel::GetStoppingPowerData(G4int iZ,G4double energyCut, |
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480 | const G4ParticleDefinition* |
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481 | theParticle) |
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482 | { |
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483 | if (!stoppingPowerData) |
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484 | stoppingPowerData = new std::map<std::pair<G4int,G4double>,G4PenelopeBremsstrahlungContinuous*>; |
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485 | |
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486 | std::pair<G4int,G4double> theKey = std::make_pair(iZ,energyCut); |
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487 | |
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488 | if (stoppingPowerData->count(theKey)) //the material already exists |
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489 | return stoppingPowerData->find(theKey)->second; |
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490 | |
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491 | //Otherwise create a new object, store it and return it |
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492 | G4String theParticleName = theParticle->GetParticleName(); |
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493 | G4PenelopeBremsstrahlungContinuous* theContinuous = new |
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494 | G4PenelopeBremsstrahlungContinuous(iZ,energyCut,LowEnergyLimit(),HighEnergyLimit(),theParticleName); |
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495 | stoppingPowerData->insert(std::make_pair(theKey,theContinuous)); |
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496 | |
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497 | if (stoppingPowerData->count(theKey)) //the material should exist now |
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498 | return stoppingPowerData->find(theKey)->second; |
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499 | else |
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500 | { |
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501 | G4Exception("Problem in G4PenelopeBremsstrahlungModel::GetStoppingPowerData()"); |
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502 | return 0; |
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503 | } |
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504 | } |
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