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 | // File name: G4PAIModel.cc |
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27 | // |
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28 | // Author: Vladimir.Grichine@cern.ch on base of Vladimir Ivanchenko code |
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29 | // |
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30 | // Creation date: 05.10.2003 |
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31 | // |
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32 | // Modifications: |
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33 | // |
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34 | // 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary |
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35 | // 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection, SampleSecondary |
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36 | // 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko) |
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37 | // |
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38 | |
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39 | #include "G4Region.hh" |
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40 | #include "G4PhysicsLogVector.hh" |
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41 | #include "G4PhysicsFreeVector.hh" |
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42 | #include "G4PhysicsTable.hh" |
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43 | #include "G4ProductionCutsTable.hh" |
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44 | #include "G4MaterialCutsCouple.hh" |
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45 | #include "G4MaterialTable.hh" |
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46 | #include "G4SandiaTable.hh" |
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47 | #include "G4OrderedTable.hh" |
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48 | |
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49 | #include "G4PAIModel.hh" |
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50 | #include "Randomize.hh" |
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51 | #include "G4Electron.hh" |
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52 | #include "G4Positron.hh" |
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53 | #include "G4Poisson.hh" |
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54 | #include "G4Step.hh" |
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55 | #include "G4Material.hh" |
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56 | #include "G4DynamicParticle.hh" |
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57 | #include "G4ParticleDefinition.hh" |
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58 | #include "G4ParticleChangeForLoss.hh" |
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59 | #include "G4GeometryTolerance.hh" |
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60 | |
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61 | //////////////////////////////////////////////////////////////////////// |
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62 | |
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63 | using namespace std; |
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64 | |
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65 | G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam) |
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66 | : G4VEmModel(nam),G4VEmFluctuationModel(nam), |
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67 | fVerbose(0), |
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68 | fLowestGamma(1.005), |
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69 | fHighestGamma(10000.), |
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70 | fTotBin(200), |
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71 | fMeanNumber(20), |
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72 | fParticle(0), |
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73 | fHighKinEnergy(100.*TeV), |
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74 | fTwoln10(2.0*log(10.0)), |
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75 | fBg2lim(0.0169), |
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76 | fTaulim(8.4146e-3) |
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77 | { |
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78 | if(p) SetParticle(p); |
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79 | |
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80 | fElectron = G4Electron::Electron(); |
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81 | fPositron = G4Positron::Positron(); |
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82 | |
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83 | fPAItransferTable = 0; |
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84 | fPAIdEdxTable = 0; |
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85 | fSandiaPhotoAbsCof = 0; |
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86 | fdEdxVector = 0; |
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87 | fLambdaVector = 0; |
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88 | fdNdxCutVector = 0; |
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89 | |
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90 | isInitialised = false; |
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91 | } |
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92 | |
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93 | //////////////////////////////////////////////////////////////////////////// |
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94 | |
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95 | G4PAIModel::~G4PAIModel() |
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96 | { |
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97 | // G4cout << "PAI: start destruction" << G4endl; |
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98 | if(fParticleEnergyVector) delete fParticleEnergyVector; |
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99 | if(fdEdxVector) delete fdEdxVector ; |
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100 | if(fLambdaVector) delete fLambdaVector; |
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101 | if(fdNdxCutVector) delete fdNdxCutVector; |
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102 | |
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103 | if( fPAItransferTable ) |
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104 | { |
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105 | fPAItransferTable->clearAndDestroy(); |
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106 | delete fPAItransferTable ; |
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107 | } |
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108 | if( fPAIdEdxTable ) |
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109 | { |
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110 | fPAIdEdxTable->clearAndDestroy(); |
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111 | delete fPAIdEdxTable ; |
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112 | } |
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113 | if(fSandiaPhotoAbsCof) |
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114 | { |
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115 | for(G4int i=0;i<fSandiaIntervalNumber;i++) |
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116 | { |
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117 | delete[] fSandiaPhotoAbsCof[i]; |
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118 | } |
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119 | delete[] fSandiaPhotoAbsCof; |
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120 | } |
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121 | //G4cout << "PAI: end destruction" << G4endl; |
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122 | } |
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123 | |
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124 | /////////////////////////////////////////////////////////////////////////////// |
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125 | |
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126 | void G4PAIModel::SetParticle(const G4ParticleDefinition* p) |
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127 | { |
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128 | if(fParticle == p) return; |
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129 | fParticle = p; |
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130 | fMass = fParticle->GetPDGMass(); |
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131 | fSpin = fParticle->GetPDGSpin(); |
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132 | G4double q = fParticle->GetPDGCharge()/eplus; |
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133 | fChargeSquare = q*q; |
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134 | fLowKinEnergy = 0.2*MeV*fMass/proton_mass_c2; |
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135 | fRatio = electron_mass_c2/fMass; |
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136 | fQc = fMass/fRatio; |
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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 | void G4PAIModel::Initialise(const G4ParticleDefinition* p, |
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142 | const G4DataVector&) |
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143 | { |
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144 | if(isInitialised) return; |
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145 | isInitialised = true; |
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146 | |
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147 | SetParticle(p); |
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148 | fLowestKineticEnergy = fMass*(fLowestGamma - 1.0); |
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149 | fHighestKineticEnergy = fMass*(fHighestGamma - 1.0); |
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150 | |
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151 | fParticleEnergyVector = new G4PhysicsLogVector(fLowestKineticEnergy, |
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152 | fHighestKineticEnergy, |
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153 | fTotBin); |
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154 | |
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155 | if(pParticleChange) |
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156 | fParticleChange = reinterpret_cast<G4ParticleChangeForLoss*>(pParticleChange); |
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157 | else |
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158 | fParticleChange = new G4ParticleChangeForLoss(); |
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159 | |
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160 | // Prepare initialization |
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161 | |
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162 | fPAItransferTable = new G4PhysicsTable(fTotBin); |
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163 | fPAIdEdxTable = new G4PhysicsTable(fTotBin); |
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164 | |
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165 | const G4ProductionCutsTable* theCoupleTable = |
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166 | G4ProductionCutsTable::GetProductionCutsTable(); |
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167 | const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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168 | size_t numOfMat = G4Material::GetNumberOfMaterials(); |
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169 | size_t numRegions = fPAIRegionVector.size(); |
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170 | |
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171 | for(size_t iReg = 0; iReg < numRegions; ++iReg) // region loop |
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172 | { |
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173 | const G4Region* curReg = fPAIRegionVector[iReg]; |
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174 | for(size_t jMat = 0; jMat < numOfMat; ++jMat) // region material loop |
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175 | { |
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176 | fMaterial = (*theMaterialTable)[jMat]; |
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177 | fCutCouple = theCoupleTable->GetMaterialCutsCouple( fMaterial, |
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178 | curReg->GetProductionCuts() ); |
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179 | if( fCutCouple ) { |
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180 | fMaterialCutsCoupleVector.push_back(fCutCouple); |
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181 | |
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182 | fDeltaCutInKinEnergy = |
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183 | (*theCoupleTable->GetEnergyCutsVector(1))[fCutCouple->GetIndex()]; |
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184 | |
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185 | //ComputeSandiaPhotoAbsCof(); |
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186 | BuildPAIonisationTable(); |
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187 | |
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188 | fPAIxscBank.push_back(fPAItransferTable); |
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189 | fPAIdEdxBank.push_back(fPAIdEdxTable); |
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190 | fdEdxTable.push_back(fdEdxVector); |
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191 | |
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192 | BuildLambdaVector(); |
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193 | fdNdxCutTable.push_back(fdNdxCutVector); |
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194 | fLambdaTable.push_back(fLambdaVector); |
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195 | } |
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196 | } |
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197 | } |
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198 | } |
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199 | |
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200 | ////////////////////////////////////////////////////////////////// |
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201 | |
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202 | void G4PAIModel::ComputeSandiaPhotoAbsCof() |
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203 | { |
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204 | G4int i, j, numberOfElements ; |
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205 | static const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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206 | |
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207 | G4SandiaTable thisMaterialSandiaTable(fMatIndex) ; |
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208 | numberOfElements = (*theMaterialTable)[fMatIndex]-> |
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209 | GetNumberOfElements(); |
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210 | G4int* thisMaterialZ = new G4int[numberOfElements] ; |
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211 | |
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212 | for(i=0;i<numberOfElements;i++) |
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213 | { |
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214 | thisMaterialZ[i] = |
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215 | (G4int)(*theMaterialTable)[fMatIndex]->GetElement(i)->GetZ() ; |
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216 | } |
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217 | fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaIntervals |
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218 | (thisMaterialZ,numberOfElements) ; |
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219 | |
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220 | fSandiaIntervalNumber = thisMaterialSandiaTable.SandiaMixing |
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221 | ( thisMaterialZ , |
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222 | (*theMaterialTable)[fMatIndex]->GetFractionVector() , |
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223 | numberOfElements,fSandiaIntervalNumber) ; |
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224 | |
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225 | fSandiaPhotoAbsCof = new G4double*[fSandiaIntervalNumber] ; |
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226 | |
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227 | for(i=0;i<fSandiaIntervalNumber;i++) fSandiaPhotoAbsCof[i] = new G4double[5] ; |
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228 | |
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229 | for( i = 0 ; i < fSandiaIntervalNumber ; i++ ) |
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230 | { |
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231 | fSandiaPhotoAbsCof[i][0] = thisMaterialSandiaTable.GetPhotoAbsorpCof(i+1,0) ; |
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232 | |
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233 | for( j = 1; j < 5 ; j++ ) |
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234 | { |
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235 | fSandiaPhotoAbsCof[i][j] = thisMaterialSandiaTable. |
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236 | GetPhotoAbsorpCof(i+1,j)* |
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237 | (*theMaterialTable)[fMatIndex]->GetDensity() ; |
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238 | } |
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239 | } |
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240 | // delete[] thisMaterialZ ; |
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241 | } |
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242 | |
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243 | //////////////////////////////////////////////////////////////////////////// |
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244 | // |
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245 | // Build tables for the ionization energy loss |
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246 | // the tables are built for MATERIALS |
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247 | // ********* |
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248 | |
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249 | void G4PAIModel::BuildPAIonisationTable() |
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250 | { |
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251 | G4double LowEdgeEnergy , ionloss ; |
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252 | G4double tau, Tmax, Tmin, Tkin, deltaLow, gamma, bg2 ; |
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253 | |
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254 | if(fdEdxVector) delete fdEdxVector; |
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255 | fdEdxVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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256 | fHighestKineticEnergy, |
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257 | fTotBin); |
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258 | G4SandiaTable* sandia = fMaterial->GetSandiaTable(); |
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259 | |
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260 | Tmin = sandia->GetSandiaCofForMaterialPAI(0,0)*keV; |
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261 | deltaLow = 100.*eV; // 0.5*eV ; |
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262 | |
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263 | for (G4int i = 0 ; i < fTotBin ; i++) //The loop for the kinetic energy |
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264 | { |
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265 | LowEdgeEnergy = fParticleEnergyVector->GetLowEdgeEnergy(i) ; |
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266 | tau = LowEdgeEnergy/fMass ; |
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267 | gamma = tau +1. ; |
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268 | // G4cout<<"gamma = "<<gamma<<endl ; |
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269 | bg2 = tau*( tau + 2. ); |
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270 | Tmax = MaxSecondaryEnergy(fParticle, LowEdgeEnergy); |
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271 | // Tmax = std::min(fDeltaCutInKinEnergy, Tmax); |
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272 | Tkin = Tmax ; |
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273 | |
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274 | // G4cout<<"proton Tkin = "<<LowEdgeEnergy/MeV<<" MeV" |
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275 | // <<" Tmax = "<<Tmax/MeV<<" MeV"<<G4endl; |
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276 | |
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277 | if ( Tmax < Tmin + deltaLow ) // low energy safety |
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278 | Tkin = Tmin + deltaLow ; |
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279 | |
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280 | /* |
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281 | G4PAIxSection protonPAI( fMatIndex, |
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282 | Tkin, |
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283 | bg2, |
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284 | fSandiaPhotoAbsCof, |
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285 | fSandiaIntervalNumber ) ; |
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286 | */ |
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287 | fPAIySection.Initialize(fMaterial, Tkin, bg2); |
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288 | |
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289 | // G4cout<<"ionloss = "<<ionloss*cm/keV<<" keV/cm"<<endl ; |
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290 | // G4cout<<"n1 = "<<protonPAI.GetIntegralPAIxSection(1)*cm<<" 1/cm"<<endl ; |
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291 | // G4cout<<"protonPAI.GetSplineSize() = "<< |
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292 | // protonPAI.GetSplineSize()<<G4endl<<G4endl ; |
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293 | |
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294 | G4int n = fPAIySection.GetSplineSize(); |
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295 | G4PhysicsFreeVector* transferVector = new G4PhysicsFreeVector(n) ; |
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296 | G4PhysicsFreeVector* dEdxVector = new G4PhysicsFreeVector(n); |
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297 | |
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298 | for( G4int k = 0 ; k < n; k++ ) |
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299 | { |
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300 | transferVector->PutValue( k , |
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301 | fPAIySection.GetSplineEnergy(k+1), |
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302 | fPAIySection.GetIntegralPAIySection(k+1) ) ; |
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303 | dEdxVector->PutValue( k , |
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304 | fPAIySection.GetSplineEnergy(k+1), |
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305 | fPAIySection.GetIntegralPAIdEdx(k+1) ) ; |
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306 | } |
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307 | ionloss = fPAIySection.GetMeanEnergyLoss() ; // total <dE/dx> |
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308 | |
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309 | if ( ionloss < DBL_MIN) ionloss = DBL_MIN; |
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310 | fdEdxVector->PutValue(i,ionloss) ; |
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311 | |
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312 | fPAItransferTable->insertAt(i,transferVector) ; |
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313 | fPAIdEdxTable->insertAt(i,dEdxVector) ; |
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314 | |
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315 | } // end of Tkin loop |
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316 | // theLossTable->insert(fdEdxVector); |
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317 | // end of material loop |
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318 | // G4cout<<"G4PAIonisation::BuildPAIonisationTable() have been called"<<G4endl ; |
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319 | // G4cout<<"G4PAIonisation::BuildLossTable() have been called"<<G4endl ; |
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320 | } |
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321 | |
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322 | /////////////////////////////////////////////////////////////////////// |
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323 | // |
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324 | // Build mean free path tables for the delta ray production process |
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325 | // tables are built for MATERIALS |
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326 | // |
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327 | |
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328 | void G4PAIModel::BuildLambdaVector() |
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329 | { |
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330 | //G4double kCarTolerance = G4GeometryTolerance::GetInstance() |
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331 | // ->GetSurfaceTolerance(); |
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332 | |
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333 | if (fLambdaVector) delete fLambdaVector; |
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334 | if (fdNdxCutVector) delete fdNdxCutVector; |
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335 | |
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336 | fLambdaVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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337 | fHighestKineticEnergy, |
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338 | fTotBin ) ; |
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339 | fdNdxCutVector = new G4PhysicsLogVector( fLowestKineticEnergy, |
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340 | fHighestKineticEnergy, |
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341 | fTotBin ) ; |
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342 | if(fVerbose > 1) |
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343 | { |
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344 | G4cout<<"PAIModel DeltaCutInKineticEnergyNow = " |
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345 | <<fDeltaCutInKinEnergy/keV<<" keV"<<G4endl; |
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346 | } |
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347 | for (G4int i = 0 ; i < fTotBin ; i++ ) |
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348 | { |
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349 | G4double dNdxCut = GetdNdxCut(i,fDeltaCutInKinEnergy) ; |
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350 | G4double lambda = dNdxCut <= DBL_MIN ? DBL_MAX: 1.0/dNdxCut ; |
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351 | |
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352 | // if (lambda <= 1000*kCarTolerance) lambda = 1000*kCarTolerance ; // Mmm ??? |
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353 | |
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354 | fLambdaVector->PutValue(i, lambda) ; |
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355 | fdNdxCutVector->PutValue(i, dNdxCut) ; |
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356 | } |
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357 | } |
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358 | |
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359 | /////////////////////////////////////////////////////////////////////// |
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360 | // |
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361 | // Returns integral PAI cross section for energy transfers >= transferCut |
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362 | |
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363 | G4double |
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364 | G4PAIModel::GetdNdxCut( G4int iPlace, G4double transferCut) |
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365 | { |
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366 | G4int iTransfer; |
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367 | G4double x1, x2, y1, y2, dNdxCut; |
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368 | // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl; |
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369 | // G4cout<<"size = "<<G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) |
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370 | // <<G4endl; |
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371 | for( iTransfer = 0 ; |
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372 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ; |
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373 | iTransfer++) |
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374 | { |
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375 | if(transferCut <= (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer)) |
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376 | { |
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377 | break ; |
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378 | } |
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379 | } |
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380 | if ( iTransfer >= G4int((*fPAItransferTable)(iPlace)->GetVectorLength()) ) |
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381 | { |
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382 | iTransfer = (*fPAItransferTable)(iPlace)->GetVectorLength() - 1 ; |
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383 | } |
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384 | y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1) ; |
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385 | y2 = (*(*fPAItransferTable)(iPlace))(iTransfer) ; |
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386 | // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl; |
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387 | x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ; |
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388 | x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ; |
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389 | // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl; |
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390 | |
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391 | if ( y1 == y2 ) dNdxCut = y2 ; |
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392 | else |
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393 | { |
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394 | // if ( x1 == x2 ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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395 | if ( std::abs(x1-x2) <= eV ) dNdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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396 | else dNdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ; |
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397 | } |
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398 | // G4cout<<""<<dNdxCut<<G4endl; |
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399 | return dNdxCut ; |
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400 | } |
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401 | /////////////////////////////////////////////////////////////////////// |
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402 | // |
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403 | // Returns integral dEdx for energy transfers >= transferCut |
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404 | |
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405 | G4double |
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406 | G4PAIModel::GetdEdxCut( G4int iPlace, G4double transferCut) |
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407 | { |
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408 | G4int iTransfer; |
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409 | G4double x1, x2, y1, y2, dEdxCut; |
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410 | // G4cout<<"iPlace = "<<iPlace<<"; "<<"transferCut = "<<transferCut<<G4endl; |
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411 | // G4cout<<"size = "<<G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) |
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412 | // <<G4endl; |
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413 | for( iTransfer = 0 ; |
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414 | iTransfer < G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ; |
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415 | iTransfer++) |
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416 | { |
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417 | if(transferCut <= (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer)) |
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418 | { |
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419 | break ; |
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420 | } |
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421 | } |
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422 | if ( iTransfer >= G4int((*fPAIdEdxTable)(iPlace)->GetVectorLength()) ) |
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423 | { |
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424 | iTransfer = (*fPAIdEdxTable)(iPlace)->GetVectorLength() - 1 ; |
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425 | } |
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426 | y1 = (*(*fPAIdEdxTable)(iPlace))(iTransfer-1) ; |
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427 | y2 = (*(*fPAIdEdxTable)(iPlace))(iTransfer) ; |
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428 | // G4cout<<"y1 = "<<y1<<"; "<<"y2 = "<<y2<<G4endl; |
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429 | x1 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1) ; |
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430 | x2 = (*fPAIdEdxTable)(iPlace)->GetLowEdgeEnergy(iTransfer) ; |
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431 | // G4cout<<"x1 = "<<x1<<"; "<<"x2 = "<<x2<<G4endl; |
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432 | |
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433 | if ( y1 == y2 ) dEdxCut = y2 ; |
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434 | else |
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435 | { |
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436 | // if ( x1 == x2 ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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437 | if ( std::abs(x1-x2) <= eV ) dEdxCut = y1 + (y2 - y1)*G4UniformRand() ; |
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438 | else dEdxCut = y1 + (transferCut - x1)*(y2 - y1)/(x2 - x1) ; |
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439 | } |
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440 | // G4cout<<""<<dEdxCut<<G4endl; |
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441 | return dEdxCut ; |
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442 | } |
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443 | |
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444 | ////////////////////////////////////////////////////////////////////////////// |
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445 | |
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446 | G4double G4PAIModel::ComputeDEDX(const G4MaterialCutsCouple* matCC, |
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447 | const G4ParticleDefinition* p, |
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448 | G4double kineticEnergy, |
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449 | G4double cutEnergy) |
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450 | { |
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451 | G4int iTkin,iPlace; |
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452 | size_t jMat; |
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453 | G4double massRatio = fMass/p->GetPDGMass(); |
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454 | G4double scaledTkin = kineticEnergy*massRatio; |
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455 | G4double charge = p->GetPDGCharge(); |
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456 | G4double charge2 = charge*charge, dEdx; |
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457 | |
---|
458 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
459 | { |
---|
460 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
461 | } |
---|
462 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
463 | |
---|
464 | fPAIdEdxTable = fPAIdEdxBank[jMat]; |
---|
465 | fdEdxVector = fdEdxTable[jMat]; |
---|
466 | for(iTkin = 0 ; iTkin < fTotBin ; iTkin++) |
---|
467 | { |
---|
468 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
469 | } |
---|
470 | iPlace = iTkin - 1; |
---|
471 | if(iPlace < 0) iPlace = 0; |
---|
472 | dEdx = charge2*( (*fdEdxVector)(iPlace) - GetdEdxCut(iPlace,cutEnergy) ) ; |
---|
473 | |
---|
474 | if( dEdx < 0.) dEdx = 0.; |
---|
475 | return dEdx; |
---|
476 | } |
---|
477 | |
---|
478 | ///////////////////////////////////////////////////////////////////////// |
---|
479 | |
---|
480 | G4double G4PAIModel::CrossSection( const G4MaterialCutsCouple* matCC, |
---|
481 | const G4ParticleDefinition* p, |
---|
482 | G4double kineticEnergy, |
---|
483 | G4double cutEnergy, |
---|
484 | G4double maxEnergy ) |
---|
485 | { |
---|
486 | G4int iTkin,iPlace; |
---|
487 | size_t jMat; |
---|
488 | G4double tmax = min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy); |
---|
489 | G4double massRatio = fMass/p->GetPDGMass(); |
---|
490 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
491 | G4double charge = p->GetPDGCharge(); |
---|
492 | G4double charge2 = charge*charge, cross, cross1, cross2; |
---|
493 | |
---|
494 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
495 | { |
---|
496 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
497 | } |
---|
498 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
499 | |
---|
500 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
501 | |
---|
502 | for(iTkin = 0 ; iTkin < fTotBin ; iTkin++) |
---|
503 | { |
---|
504 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
505 | } |
---|
506 | iPlace = iTkin - 1; |
---|
507 | if(iPlace < 0) iPlace = 0; |
---|
508 | |
---|
509 | // G4cout<<"iPlace = "<<iPlace<<"; tmax = " |
---|
510 | // <<tmax<<"; cutEnergy = "<<cutEnergy<<G4endl; |
---|
511 | cross1 = GetdNdxCut(iPlace,tmax) ; |
---|
512 | // G4cout<<"cross1 = "<<cross1<<G4endl; |
---|
513 | cross2 = GetdNdxCut(iPlace,cutEnergy) ; |
---|
514 | // G4cout<<"cross2 = "<<cross2<<G4endl; |
---|
515 | cross = (cross2-cross1)*charge2; |
---|
516 | // G4cout<<"cross = "<<cross<<G4endl; |
---|
517 | if( cross < DBL_MIN) cross = DBL_MIN; |
---|
518 | // if( cross2 < DBL_MIN) cross2 = DBL_MIN; |
---|
519 | |
---|
520 | // return cross2; |
---|
521 | return cross; |
---|
522 | } |
---|
523 | |
---|
524 | /////////////////////////////////////////////////////////////////////////// |
---|
525 | // |
---|
526 | // It is analog of PostStepDoIt in terms of secondary electron. |
---|
527 | // |
---|
528 | |
---|
529 | void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp, |
---|
530 | const G4MaterialCutsCouple* matCC, |
---|
531 | const G4DynamicParticle* dp, |
---|
532 | G4double tmin, |
---|
533 | G4double maxEnergy) |
---|
534 | { |
---|
535 | size_t jMat; |
---|
536 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
537 | { |
---|
538 | if( matCC == fMaterialCutsCoupleVector[jMat] ) break; |
---|
539 | } |
---|
540 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
541 | |
---|
542 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
543 | fdNdxCutVector = fdNdxCutTable[jMat]; |
---|
544 | |
---|
545 | G4double tmax = std::min(MaxSecondaryKinEnergy(dp), maxEnergy); |
---|
546 | if( tmin >= tmax && fVerbose > 0) |
---|
547 | { |
---|
548 | G4cout<<"G4PAIModel::SampleSecondary: tmin >= tmax "<<G4endl; |
---|
549 | } |
---|
550 | G4ThreeVector direction= dp->GetMomentumDirection(); |
---|
551 | G4double particleMass = dp->GetMass(); |
---|
552 | G4double kineticEnergy = dp->GetKineticEnergy(); |
---|
553 | |
---|
554 | G4double massRatio = fMass/particleMass; |
---|
555 | G4double scaledTkin = kineticEnergy*massRatio; |
---|
556 | G4double totalEnergy = kineticEnergy + particleMass; |
---|
557 | G4double pSquare = kineticEnergy*(totalEnergy+particleMass); |
---|
558 | |
---|
559 | G4double deltaTkin = GetPostStepTransfer(scaledTkin); |
---|
560 | |
---|
561 | // G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV<<" keV "<<G4endl; |
---|
562 | |
---|
563 | if( deltaTkin <= 0. && fVerbose > 0) |
---|
564 | { |
---|
565 | G4cout<<"G4PAIModel::SampleSecondary e- deltaTkin = "<<deltaTkin<<G4endl; |
---|
566 | } |
---|
567 | if( deltaTkin <= 0.) return; |
---|
568 | |
---|
569 | if( deltaTkin > tmax) deltaTkin = tmax; |
---|
570 | |
---|
571 | G4double deltaTotalMomentum = sqrt(deltaTkin*(deltaTkin + 2. * electron_mass_c2 )); |
---|
572 | G4double totalMomentum = sqrt(pSquare); |
---|
573 | G4double costheta = deltaTkin*(totalEnergy + electron_mass_c2) |
---|
574 | /(deltaTotalMomentum * totalMomentum); |
---|
575 | |
---|
576 | if( costheta > 0.99999 ) costheta = 0.99999; |
---|
577 | G4double sintheta = 0.0; |
---|
578 | G4double sin2 = 1. - costheta*costheta; |
---|
579 | if( sin2 > 0.) sintheta = sqrt(sin2); |
---|
580 | |
---|
581 | // direction of the delta electron |
---|
582 | G4double phi = twopi*G4UniformRand(); |
---|
583 | G4double dirx = sintheta*cos(phi), diry = sintheta*sin(phi), dirz = costheta; |
---|
584 | |
---|
585 | G4ThreeVector deltaDirection(dirx,diry,dirz); |
---|
586 | deltaDirection.rotateUz(direction); |
---|
587 | deltaDirection.unit(); |
---|
588 | |
---|
589 | // primary change |
---|
590 | kineticEnergy -= deltaTkin; |
---|
591 | G4ThreeVector dir = totalMomentum*direction - deltaTotalMomentum*deltaDirection; |
---|
592 | direction = dir.unit(); |
---|
593 | fParticleChange->SetProposedKineticEnergy(kineticEnergy); |
---|
594 | fParticleChange->SetProposedMomentumDirection(direction); |
---|
595 | |
---|
596 | // create G4DynamicParticle object for e- delta ray |
---|
597 | G4DynamicParticle* deltaRay = new G4DynamicParticle; |
---|
598 | deltaRay->SetDefinition(G4Electron::Electron()); |
---|
599 | deltaRay->SetKineticEnergy( deltaTkin ); // !!! trick for last steps /2.0 ??? |
---|
600 | deltaRay->SetMomentumDirection(deltaDirection); |
---|
601 | |
---|
602 | vdp->push_back(deltaRay); |
---|
603 | } |
---|
604 | |
---|
605 | |
---|
606 | /////////////////////////////////////////////////////////////////////// |
---|
607 | // |
---|
608 | // Returns post step PAI energy transfer > cut electron energy according to passed |
---|
609 | // scaled kinetic energy of particle |
---|
610 | |
---|
611 | G4double |
---|
612 | G4PAIModel::GetPostStepTransfer( G4double scaledTkin ) |
---|
613 | { |
---|
614 | // G4cout<<"G4PAIModel::GetPostStepTransfer"<<G4endl ; |
---|
615 | |
---|
616 | G4int iTkin, iTransfer, iPlace ; |
---|
617 | G4double transfer = 0.0, position, dNdxCut1, dNdxCut2, E1, E2, W1, W2, W ; |
---|
618 | |
---|
619 | for(iTkin=0;iTkin<fTotBin;iTkin++) |
---|
620 | { |
---|
621 | if(scaledTkin < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
622 | } |
---|
623 | iPlace = iTkin - 1 ; |
---|
624 | // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ; |
---|
625 | if(iPlace < 0) iPlace = 0; |
---|
626 | dNdxCut1 = (*fdNdxCutVector)(iPlace) ; |
---|
627 | // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ; |
---|
628 | |
---|
629 | |
---|
630 | if(iTkin == fTotBin) // Fermi plato, try from left |
---|
631 | { |
---|
632 | position = dNdxCut1*G4UniformRand() ; |
---|
633 | |
---|
634 | for( iTransfer = 0; |
---|
635 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
636 | { |
---|
637 | if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ; |
---|
638 | } |
---|
639 | transfer = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
640 | } |
---|
641 | else |
---|
642 | { |
---|
643 | dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; |
---|
644 | // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ; |
---|
645 | if(iTkin == 0) // Tkin is too small, trying from right only |
---|
646 | { |
---|
647 | position = dNdxCut2*G4UniformRand() ; |
---|
648 | |
---|
649 | for( iTransfer = 0; |
---|
650 | iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ ) |
---|
651 | { |
---|
652 | if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ; |
---|
653 | } |
---|
654 | transfer = GetEnergyTransfer(iPlace+1,position,iTransfer); |
---|
655 | } |
---|
656 | else // general case: Tkin between two vectors of the material |
---|
657 | { |
---|
658 | E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; |
---|
659 | E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin) ; |
---|
660 | W = 1.0/(E2 - E1) ; |
---|
661 | W1 = (E2 - scaledTkin)*W ; |
---|
662 | W2 = (scaledTkin - E1)*W ; |
---|
663 | |
---|
664 | position = ( dNdxCut1*W1 + dNdxCut2*W2 )*G4UniformRand() ; |
---|
665 | |
---|
666 | // G4cout<<position<<"\t" ; |
---|
667 | |
---|
668 | G4int iTrMax1, iTrMax2, iTrMax; |
---|
669 | |
---|
670 | iTrMax1 = G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); |
---|
671 | iTrMax2 = G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); |
---|
672 | |
---|
673 | if (iTrMax1 >= iTrMax2) iTrMax = iTrMax2; |
---|
674 | else iTrMax = iTrMax1; |
---|
675 | |
---|
676 | |
---|
677 | for( iTransfer = 0; iTransfer < iTrMax; iTransfer++ ) |
---|
678 | { |
---|
679 | if( position >= |
---|
680 | ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + |
---|
681 | (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) break ; |
---|
682 | } |
---|
683 | transfer = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
684 | } |
---|
685 | } |
---|
686 | // G4cout<<"PAImodel PostStepTransfer = "<<transfer/keV<<" keV"<<G4endl ; |
---|
687 | if(transfer < 0.0 ) transfer = 0.0 ; |
---|
688 | // if(transfer < DBL_MIN ) transfer = DBL_MIN; |
---|
689 | |
---|
690 | return transfer ; |
---|
691 | } |
---|
692 | |
---|
693 | /////////////////////////////////////////////////////////////////////// |
---|
694 | // |
---|
695 | // Returns random PAI energy transfer according to passed |
---|
696 | // indexes of particle kinetic |
---|
697 | |
---|
698 | G4double |
---|
699 | G4PAIModel::GetEnergyTransfer( G4int iPlace, G4double position, G4int iTransfer ) |
---|
700 | { |
---|
701 | G4int iTransferMax; |
---|
702 | G4double x1, x2, y1, y2, energyTransfer; |
---|
703 | |
---|
704 | if(iTransfer == 0) |
---|
705 | { |
---|
706 | energyTransfer = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer); |
---|
707 | } |
---|
708 | else |
---|
709 | { |
---|
710 | iTransferMax = G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); |
---|
711 | |
---|
712 | if ( iTransfer >= iTransferMax ) iTransfer = iTransferMax - 1; |
---|
713 | |
---|
714 | y1 = (*(*fPAItransferTable)(iPlace))(iTransfer-1); |
---|
715 | y2 = (*(*fPAItransferTable)(iPlace))(iTransfer); |
---|
716 | |
---|
717 | x1 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer-1); |
---|
718 | x2 = (*fPAItransferTable)(iPlace)->GetLowEdgeEnergy(iTransfer); |
---|
719 | |
---|
720 | if ( x1 == x2 ) energyTransfer = x2; |
---|
721 | else |
---|
722 | { |
---|
723 | if ( y1 == y2 ) energyTransfer = x1 + (x2 - x1)*G4UniformRand(); |
---|
724 | else |
---|
725 | { |
---|
726 | energyTransfer = x1 + (position - y1)*(x2 - x1)/(y2 - y1); |
---|
727 | } |
---|
728 | } |
---|
729 | } |
---|
730 | return energyTransfer; |
---|
731 | } |
---|
732 | |
---|
733 | /////////////////////////////////////////////////////////////////////// |
---|
734 | |
---|
735 | G4double G4PAIModel::SampleFluctuations( const G4Material* material, |
---|
736 | const G4DynamicParticle* aParticle, |
---|
737 | G4double&, |
---|
738 | G4double& step, |
---|
739 | G4double&) |
---|
740 | { |
---|
741 | size_t jMat; |
---|
742 | for( jMat = 0 ;jMat < fMaterialCutsCoupleVector.size() ; ++jMat ) |
---|
743 | { |
---|
744 | if( material == fMaterialCutsCoupleVector[jMat]->GetMaterial() ) break; |
---|
745 | } |
---|
746 | if(jMat == fMaterialCutsCoupleVector.size() && jMat > 0) jMat--; |
---|
747 | |
---|
748 | fPAItransferTable = fPAIxscBank[jMat]; |
---|
749 | fdNdxCutVector = fdNdxCutTable[jMat]; |
---|
750 | |
---|
751 | G4int iTkin, iTransfer, iPlace ; |
---|
752 | G4long numOfCollisions=0; |
---|
753 | |
---|
754 | // G4cout<<"G4PAIModel::SampleFluctuations"<<G4endl ; |
---|
755 | //G4cout<<"in: "<<fMaterialCutsCoupleVector[jMat]->GetMaterial()->GetName()<<G4endl ; |
---|
756 | |
---|
757 | G4double loss = 0.0, charge2 ; |
---|
758 | G4double stepSum = 0., stepDelta, lambda, omega; |
---|
759 | G4double position, E1, E2, W1, W2, W, dNdxCut1, dNdxCut2, meanNumber; |
---|
760 | G4bool numb = true; |
---|
761 | G4double Tkin = aParticle->GetKineticEnergy() ; |
---|
762 | G4double MassRatio = fMass/aParticle->GetDefinition()->GetPDGMass() ; |
---|
763 | G4double charge = aParticle->GetDefinition()->GetPDGCharge() ; |
---|
764 | charge2 = charge*charge ; |
---|
765 | G4double TkinScaled = Tkin*MassRatio ; |
---|
766 | |
---|
767 | for(iTkin=0;iTkin<fTotBin;iTkin++) |
---|
768 | { |
---|
769 | if(TkinScaled < fParticleEnergyVector->GetLowEdgeEnergy(iTkin)) break ; |
---|
770 | } |
---|
771 | iPlace = iTkin - 1 ; |
---|
772 | if(iPlace < 0) iPlace = 0; |
---|
773 | // G4cout<<"from search, iPlace = "<<iPlace<<G4endl ; |
---|
774 | dNdxCut1 = (*fdNdxCutVector)(iPlace) ; |
---|
775 | // G4cout<<"dNdxCut1 = "<<dNdxCut1<<G4endl ; |
---|
776 | |
---|
777 | |
---|
778 | if(iTkin == fTotBin) // Fermi plato, try from left |
---|
779 | { |
---|
780 | meanNumber =((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*step*charge2; |
---|
781 | if(meanNumber < 0.) meanNumber = 0. ; |
---|
782 | // numOfCollisions = RandPoisson::shoot(meanNumber) ; |
---|
783 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
784 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
785 | else lambda = DBL_MAX; |
---|
786 | while(numb) |
---|
787 | { |
---|
788 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
789 | stepSum += stepDelta; |
---|
790 | if(stepSum >= step) break; |
---|
791 | numOfCollisions++; |
---|
792 | } |
---|
793 | // G4cout<<"##1 numOfCollisions = "<<numOfCollisions<<G4endl ; |
---|
794 | |
---|
795 | while(numOfCollisions) |
---|
796 | { |
---|
797 | position = dNdxCut1+ |
---|
798 | ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*G4UniformRand() ; |
---|
799 | |
---|
800 | for( iTransfer = 0; |
---|
801 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
802 | { |
---|
803 | if(position >= (*(*fPAItransferTable)(iPlace))(iTransfer)) break ; |
---|
804 | } |
---|
805 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
806 | // G4cout<<"G4PAIModel::SampleFluctuations, omega = "<<omega/keV<<" keV; "<<"\t"; |
---|
807 | loss += omega; |
---|
808 | numOfCollisions-- ; |
---|
809 | } |
---|
810 | } |
---|
811 | else |
---|
812 | { |
---|
813 | dNdxCut2 = (*fdNdxCutVector)(iPlace+1) ; |
---|
814 | // G4cout<<"dNdxCut2 = "<<dNdxCut2<<G4endl ; |
---|
815 | |
---|
816 | if(iTkin == 0) // Tkin is too small, trying from right only |
---|
817 | { |
---|
818 | meanNumber =((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*step*charge2; |
---|
819 | if( meanNumber < 0. ) meanNumber = 0. ; |
---|
820 | // numOfCollisions = CLHEP::RandPoisson::shoot(meanNumber) ; |
---|
821 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
822 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
823 | else lambda = DBL_MAX; |
---|
824 | while(numb) |
---|
825 | { |
---|
826 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
827 | stepSum += stepDelta; |
---|
828 | if(stepSum >= step) break; |
---|
829 | numOfCollisions++; |
---|
830 | } |
---|
831 | |
---|
832 | //G4cout<<"##2 numOfCollisions = "<<numOfCollisions<<G4endl ; |
---|
833 | |
---|
834 | while(numOfCollisions) |
---|
835 | { |
---|
836 | position = dNdxCut2+ |
---|
837 | ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*G4UniformRand(); |
---|
838 | |
---|
839 | for( iTransfer = 0; |
---|
840 | iTransfer < G4int((*fPAItransferTable)(iPlace+1)->GetVectorLength()); iTransfer++ ) |
---|
841 | { |
---|
842 | if(position >= (*(*fPAItransferTable)(iPlace+1))(iTransfer)) break ; |
---|
843 | } |
---|
844 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
845 | // G4cout<<omega/keV<<"\t"; |
---|
846 | loss += omega; |
---|
847 | numOfCollisions-- ; |
---|
848 | } |
---|
849 | } |
---|
850 | else // general case: Tkin between two vectors of the material |
---|
851 | { |
---|
852 | E1 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin - 1) ; |
---|
853 | E2 = fParticleEnergyVector->GetLowEdgeEnergy(iTkin) ; |
---|
854 | W = 1.0/(E2 - E1) ; |
---|
855 | W1 = (E2 - TkinScaled)*W ; |
---|
856 | W2 = (TkinScaled - E1)*W ; |
---|
857 | |
---|
858 | // G4cout<<"(*(*fPAItransferTable)(iPlace))(0) = "<< |
---|
859 | // (*(*fPAItransferTable)(iPlace))(0)<<G4endl ; |
---|
860 | // G4cout<<"(*(*fPAItransferTable)(iPlace+1))(0) = "<< |
---|
861 | // (*(*fPAItransferTable)(iPlace+1))(0)<<G4endl ; |
---|
862 | |
---|
863 | meanNumber=( ((*(*fPAItransferTable)(iPlace))(0)-dNdxCut1)*W1 + |
---|
864 | ((*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2)*W2 )*step*charge2; |
---|
865 | if(meanNumber<0.0) meanNumber = 0.0; |
---|
866 | // numOfCollisions = RandPoisson::shoot(meanNumber) ; |
---|
867 | // numOfCollisions = G4Poisson(meanNumber) ; |
---|
868 | if( meanNumber > 0.) lambda = step/meanNumber; |
---|
869 | else lambda = DBL_MAX; |
---|
870 | while(numb) |
---|
871 | { |
---|
872 | stepDelta = CLHEP::RandExponential::shoot(lambda); |
---|
873 | stepSum += stepDelta; |
---|
874 | if(stepSum >= step) break; |
---|
875 | numOfCollisions++; |
---|
876 | } |
---|
877 | |
---|
878 | //G4cout<<"##3 numOfCollisions = "<<numOfCollisions<<endl ; |
---|
879 | |
---|
880 | while(numOfCollisions) |
---|
881 | { |
---|
882 | position = dNdxCut1*W1 + dNdxCut2*W2 + |
---|
883 | ( ( (*(*fPAItransferTable)(iPlace))(0)-dNdxCut1 )*W1 + |
---|
884 | dNdxCut2+ |
---|
885 | ( (*(*fPAItransferTable)(iPlace+1))(0)-dNdxCut2 )*W2 )*G4UniformRand(); |
---|
886 | |
---|
887 | // G4cout<<position<<"\t" ; |
---|
888 | |
---|
889 | for( iTransfer = 0; |
---|
890 | iTransfer < G4int((*fPAItransferTable)(iPlace)->GetVectorLength()); iTransfer++ ) |
---|
891 | { |
---|
892 | if( position >= |
---|
893 | ( (*(*fPAItransferTable)(iPlace))(iTransfer)*W1 + |
---|
894 | (*(*fPAItransferTable)(iPlace+1))(iTransfer)*W2) ) |
---|
895 | { |
---|
896 | break ; |
---|
897 | } |
---|
898 | } |
---|
899 | omega = GetEnergyTransfer(iPlace,position,iTransfer); |
---|
900 | // G4cout<<omega/keV<<"\t"; |
---|
901 | loss += omega; |
---|
902 | numOfCollisions-- ; |
---|
903 | } |
---|
904 | } |
---|
905 | } |
---|
906 | // G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = " |
---|
907 | // <<step/mm<<" mm"<<G4endl ; |
---|
908 | if(loss > Tkin) loss=Tkin; |
---|
909 | if(loss < 0. ) loss = 0.; |
---|
910 | return loss ; |
---|
911 | |
---|
912 | } |
---|
913 | |
---|
914 | ////////////////////////////////////////////////////////////////////// |
---|
915 | // |
---|
916 | // Returns the statistical estimation of the energy loss distribution variance |
---|
917 | // |
---|
918 | |
---|
919 | |
---|
920 | G4double G4PAIModel::Dispersion( const G4Material* material, |
---|
921 | const G4DynamicParticle* aParticle, |
---|
922 | G4double& tmax, |
---|
923 | G4double& step ) |
---|
924 | { |
---|
925 | G4double loss, sumLoss=0., sumLoss2=0., sigma2, meanLoss=0.; |
---|
926 | for(G4int i = 0 ; i < fMeanNumber; i++) |
---|
927 | { |
---|
928 | loss = SampleFluctuations(material,aParticle,tmax,step,meanLoss); |
---|
929 | sumLoss += loss; |
---|
930 | sumLoss2 += loss*loss; |
---|
931 | } |
---|
932 | meanLoss = sumLoss/fMeanNumber; |
---|
933 | sigma2 = meanLoss*meanLoss + (sumLoss2-2*sumLoss*meanLoss)/fMeanNumber; |
---|
934 | return sigma2; |
---|
935 | } |
---|
936 | |
---|
937 | |
---|
938 | // |
---|
939 | // |
---|
940 | ///////////////////////////////////////////////// |
---|
941 | |
---|
942 | |
---|
943 | |
---|
944 | |
---|
945 | |
---|
946 | |
---|