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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4ePolarizedIonisation.cc,v 1.5 2007/07/10 09:35:37 schaelic Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class file |
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32 | // |
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33 | // |
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34 | // File name: G4ePolarizedIonisation |
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35 | // |
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36 | // Author: A.Schaelicke on base of Vladimir Ivanchenko code |
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37 | // |
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38 | // Creation date: 10.11.2005 |
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39 | // |
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40 | // Modifications: |
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41 | // |
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42 | // 10-11-05, include polarization description (A.Schaelicke) |
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43 | // , create asymmetry table and determine interactionlength |
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44 | // , update polarized differential cross section |
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45 | // |
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46 | // 20-08-06, modified interface (A.Schaelicke) |
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47 | // 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke) |
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48 | // |
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49 | // Class Description: |
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50 | // |
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51 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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52 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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53 | |
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54 | #include "G4ePolarizedIonisation.hh" |
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55 | #include "G4Electron.hh" |
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56 | #include "G4UniversalFluctuation.hh" |
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57 | #include "G4BohrFluctuations.hh" |
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58 | #include "G4UnitsTable.hh" |
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59 | |
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60 | #include "G4PolarizedMollerBhabhaModel.hh" |
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61 | #include "G4ProductionCutsTable.hh" |
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62 | #include "G4PolarizationManager.hh" |
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63 | #include "G4PolarizationHelper.hh" |
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64 | #include "G4StokesVector.hh" |
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65 | |
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66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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67 | |
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68 | G4ePolarizedIonisation::G4ePolarizedIonisation(const G4String& name) |
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69 | : G4VEnergyLossProcess(name), |
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70 | theElectron(G4Electron::Electron()), |
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71 | isElectron(true), |
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72 | isInitialised(false), |
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73 | theAsymmetryTable(NULL), |
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74 | theTransverseAsymmetryTable(NULL) |
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75 | { |
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76 | verboseLevel=0; |
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77 | SetDEDXBinning(120); |
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78 | SetLambdaBinning(120); |
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79 | numBinAsymmetryTable=120; |
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80 | |
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81 | SetMinKinEnergy(0.1*keV); |
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82 | SetMaxKinEnergy(100.0*TeV); |
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83 | // PrintInfoDefinition(); |
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84 | } |
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85 | |
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86 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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87 | |
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88 | G4ePolarizedIonisation::~G4ePolarizedIonisation() |
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89 | { |
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90 | if (theAsymmetryTable) { |
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91 | theAsymmetryTable->clearAndDestroy(); |
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92 | delete theAsymmetryTable; |
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93 | } |
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94 | if (theTransverseAsymmetryTable) { |
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95 | theTransverseAsymmetryTable->clearAndDestroy(); |
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96 | delete theTransverseAsymmetryTable; |
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97 | } |
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98 | } |
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99 | |
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100 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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101 | |
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102 | void G4ePolarizedIonisation::InitialiseEnergyLossProcess( |
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103 | const G4ParticleDefinition* part, |
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104 | const G4ParticleDefinition* /*part2*/) |
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105 | { |
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106 | if(!isInitialised) { |
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107 | |
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108 | if(part == G4Positron::Positron()) isElectron = false; |
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109 | SetSecondaryParticle(theElectron); |
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110 | |
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111 | |
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112 | |
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113 | flucModel = new G4UniversalFluctuation(); |
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114 | //flucModel = new G4BohrFluctuations(); |
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115 | |
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116 | // G4VEmModel* em = new G4MollerBhabhaModel(); |
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117 | emModel = new G4PolarizedMollerBhabhaModel; |
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118 | emModel->SetLowEnergyLimit(100*eV); |
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119 | emModel->SetHighEnergyLimit(100*TeV); |
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120 | AddEmModel(1, emModel, flucModel); |
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121 | |
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122 | isInitialised = true; |
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123 | } |
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124 | } |
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125 | |
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126 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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127 | |
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128 | void G4ePolarizedIonisation::PrintInfo() |
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129 | { |
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130 | G4cout << " Delta cross sections from Moller+Bhabha, " |
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131 | << "good description from 1 KeV to 100 GeV." |
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132 | << G4endl; |
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133 | } |
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134 | |
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135 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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136 | |
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137 | G4double G4ePolarizedIonisation::GetMeanFreePath(const G4Track& track, |
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138 | G4double s, |
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139 | G4ForceCondition* cond) |
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140 | { |
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141 | // *** get unploarised mean free path from lambda table *** |
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142 | G4double mfp = G4VEnergyLossProcess::GetMeanFreePath(track, s, cond); |
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143 | |
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144 | |
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145 | // *** get asymmetry, if target is polarized *** |
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146 | G4VPhysicalVolume* aPVolume = track.GetVolume(); |
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147 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
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148 | |
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149 | G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance(); |
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150 | const G4bool volumeIsPolarized = polarizationManger->IsPolarized(aLVolume); |
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151 | const G4StokesVector ePolarization = track.GetPolarization(); |
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152 | |
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153 | if (mfp != DBL_MAX && volumeIsPolarized && !ePolarization.IsZero()) { |
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154 | const G4DynamicParticle* aDynamicElectron = track.GetDynamicParticle(); |
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155 | const G4double eEnergy = aDynamicElectron->GetKineticEnergy(); |
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156 | const G4ParticleMomentum eDirection0 = aDynamicElectron->GetMomentumDirection(); |
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157 | |
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158 | G4StokesVector volumePolarization = polarizationManger->GetVolumePolarization(aLVolume); |
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159 | |
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160 | G4bool isOutRange; |
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161 | size_t idx = CurrentMaterialCutsCoupleIndex(); |
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162 | G4double lAsymmetry = (*theAsymmetryTable)(idx)-> |
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163 | GetValue(eEnergy, isOutRange); |
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164 | G4double tAsymmetry = (*theTransverseAsymmetryTable)(idx)-> |
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165 | GetValue(eEnergy, isOutRange); |
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166 | |
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167 | // calculate longitudinal spin component |
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168 | G4double polZZ = ePolarization.z()* |
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169 | volumePolarization*eDirection0; |
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170 | // calculate transvers spin components |
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171 | G4double polXX = ePolarization.x()* |
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172 | volumePolarization*G4PolarizationHelper::GetParticleFrameX(eDirection0); |
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173 | G4double polYY = ePolarization.y()* |
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174 | volumePolarization*G4PolarizationHelper::GetParticleFrameY(eDirection0); |
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175 | |
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176 | |
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177 | G4double impact = 1. + polZZ*lAsymmetry + (polXX + polYY)*tAsymmetry; |
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178 | // determine polarization dependent mean free path |
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179 | mfp /= impact; |
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180 | if (mfp <=0.) { |
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181 | G4cout <<"PV impact ( "<<polXX<<" , "<<polYY<<" , "<<polZZ<<" )"<<G4endl; |
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182 | G4cout << " impact on MFP is "<< impact <<G4endl; |
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183 | G4cout<<" lAsymmetry= "<<lAsymmetry<<" ("<<std::fabs(lAsymmetry)-1.<<")\n"; |
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184 | G4cout<<" tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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185 | } |
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186 | } |
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187 | |
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188 | return mfp; |
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189 | } |
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190 | |
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191 | G4double G4ePolarizedIonisation::PostStepGetPhysicalInteractionLength(const G4Track& track, |
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192 | G4double s, |
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193 | G4ForceCondition* cond) |
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194 | { |
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195 | // *** get unploarised mean free path from lambda table *** |
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196 | G4double mfp = G4VEnergyLossProcess::PostStepGetPhysicalInteractionLength(track, s, cond); |
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197 | |
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198 | |
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199 | // *** get asymmetry, if target is polarized *** |
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200 | G4VPhysicalVolume* aPVolume = track.GetVolume(); |
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201 | G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume(); |
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202 | |
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203 | G4PolarizationManager * polarizationManger = G4PolarizationManager::GetInstance(); |
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204 | const G4bool volumeIsPolarized = polarizationManger->IsPolarized(aLVolume); |
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205 | const G4StokesVector ePolarization = track.GetPolarization(); |
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206 | |
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207 | if (mfp != DBL_MAX && volumeIsPolarized && !ePolarization.IsZero()) { |
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208 | const G4DynamicParticle* aDynamicElectron = track.GetDynamicParticle(); |
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209 | const G4double eEnergy = aDynamicElectron->GetKineticEnergy(); |
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210 | const G4ParticleMomentum eDirection0 = aDynamicElectron->GetMomentumDirection(); |
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211 | |
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212 | G4StokesVector volumePolarization = polarizationManger->GetVolumePolarization(aLVolume); |
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213 | |
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214 | G4bool isOutRange; |
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215 | size_t idx = CurrentMaterialCutsCoupleIndex(); |
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216 | G4double lAsymmetry = (*theAsymmetryTable)(idx)-> |
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217 | GetValue(eEnergy, isOutRange); |
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218 | G4double tAsymmetry = (*theTransverseAsymmetryTable)(idx)-> |
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219 | GetValue(eEnergy, isOutRange); |
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220 | |
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221 | // calculate longitudinal spin component |
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222 | G4double polZZ = ePolarization.z()* |
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223 | volumePolarization*eDirection0; |
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224 | // calculate transvers spin components |
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225 | G4double polXX = ePolarization.x()* |
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226 | volumePolarization*G4PolarizationHelper::GetParticleFrameX(eDirection0); |
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227 | G4double polYY = ePolarization.y()* |
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228 | volumePolarization*G4PolarizationHelper::GetParticleFrameY(eDirection0); |
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229 | |
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230 | |
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231 | G4double impact = 1. + polZZ*lAsymmetry + (polXX + polYY)*tAsymmetry; |
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232 | // determine polarization dependent mean free path |
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233 | mfp /= impact; |
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234 | if (mfp <=0.) { |
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235 | G4cout <<"PV impact ( "<<polXX<<" , "<<polYY<<" , "<<polZZ<<" )"<<G4endl; |
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236 | G4cout << " impact on MFP is "<< impact <<G4endl; |
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237 | G4cout<<" lAsymmetry= "<<lAsymmetry<<" ("<<std::fabs(lAsymmetry)-1.<<")\n"; |
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238 | G4cout<<" tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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239 | } |
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240 | } |
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241 | |
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242 | return mfp; |
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243 | } |
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244 | |
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245 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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246 | void G4ePolarizedIonisation::BuildPhysicsTable(const G4ParticleDefinition& part) |
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247 | { |
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248 | // *** build DEDX and (unpolarized) cross section tables |
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249 | G4VEnergyLossProcess::BuildPhysicsTable(part); |
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250 | // G4PhysicsTable* pt = |
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251 | // BuildDEDXTable(); |
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252 | |
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253 | |
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254 | // *** build asymmetry-table |
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255 | if (theAsymmetryTable) { |
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256 | theAsymmetryTable->clearAndDestroy(); delete theAsymmetryTable;} |
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257 | if (theTransverseAsymmetryTable) { |
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258 | theTransverseAsymmetryTable->clearAndDestroy(); delete theTransverseAsymmetryTable;} |
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259 | |
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260 | const G4ProductionCutsTable* theCoupleTable= |
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261 | G4ProductionCutsTable::GetProductionCutsTable(); |
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262 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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263 | |
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264 | theAsymmetryTable = new G4PhysicsTable(numOfCouples); |
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265 | theTransverseAsymmetryTable = new G4PhysicsTable(numOfCouples); |
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266 | |
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267 | for (size_t j=0 ; j < numOfCouples; j++ ) { |
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268 | // get cut value |
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269 | const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(j); |
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270 | |
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271 | G4double tcutmin = emModel->MinEnergyCut(&part, couple); |
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272 | G4double cut = (*theCoupleTable->GetEnergyCutsVector(1))[j]; |
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273 | cut = std::max(cut, tcutmin); |
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274 | |
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275 | //create physics vectors then fill it (same parameters as lambda vector) |
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276 | G4PhysicsVector * ptrVectorA = LambdaPhysicsVector(couple,cut); |
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277 | G4PhysicsVector * ptrVectorB = LambdaPhysicsVector(couple,cut); |
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278 | |
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279 | for (size_t i = 0 ; i < numBinAsymmetryTable ; i++ ) { |
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280 | G4double lowEdgeEnergy = ptrVectorA->GetLowEdgeEnergy(i); |
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281 | G4double tasm=0.; |
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282 | G4double asym = ComputeAsymmetry(lowEdgeEnergy, couple, part, cut, tasm); |
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283 | ptrVectorA->PutValue(i,asym); |
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284 | ptrVectorB->PutValue(i,tasm); |
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285 | } |
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286 | theAsymmetryTable->insertAt( j , ptrVectorA ) ; |
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287 | theTransverseAsymmetryTable->insertAt( j , ptrVectorB ) ; |
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288 | } |
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289 | |
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290 | } |
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291 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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292 | |
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293 | G4double G4ePolarizedIonisation::ComputeAsymmetry(G4double energy, |
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294 | const G4MaterialCutsCouple* couple, |
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295 | const G4ParticleDefinition& aParticle, |
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296 | G4double cut, |
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297 | G4double & tAsymmetry) |
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298 | { |
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299 | G4double lAsymmetry = 0.0; |
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300 | tAsymmetry = 0.0; |
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301 | if (isElectron) {lAsymmetry = tAsymmetry = -1.0;} |
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302 | |
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303 | // calculate polarized cross section |
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304 | theTargetPolarization=G4ThreeVector(0.,0.,1.); |
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305 | emModel->SetTargetPolarization(theTargetPolarization); |
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306 | emModel->SetBeamPolarization(theTargetPolarization); |
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307 | G4double sigma2=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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308 | |
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309 | // calculate transversely polarized cross section |
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310 | theTargetPolarization=G4ThreeVector(1.,0.,0.); |
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311 | emModel->SetTargetPolarization(theTargetPolarization); |
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312 | emModel->SetBeamPolarization(theTargetPolarization); |
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313 | G4double sigma3=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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314 | |
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315 | // calculate unpolarized cross section |
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316 | theTargetPolarization=G4ThreeVector(); |
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317 | emModel->SetTargetPolarization(theTargetPolarization); |
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318 | emModel->SetBeamPolarization(theTargetPolarization); |
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319 | G4double sigma0=emModel->CrossSection(couple,&aParticle,energy,cut,energy); |
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320 | // determine assymmetries |
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321 | if (sigma0>0.) { |
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322 | lAsymmetry=sigma2/sigma0-1.; |
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323 | tAsymmetry=sigma3/sigma0-1.; |
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324 | } |
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325 | if (std::fabs(lAsymmetry)>1.) { |
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326 | G4cout<<" energy="<<energy<<"\n"; |
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327 | G4cout<<"WARNING lAsymmetry= "<<lAsymmetry<<" ("<<std::fabs(lAsymmetry)-1.<<")\n"; |
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328 | } |
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329 | if (std::fabs(tAsymmetry)>1.) { |
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330 | G4cout<<" energy="<<energy<<"\n"; |
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331 | G4cout<<"WARNING tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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332 | } |
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333 | // else { |
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334 | // G4cout<<" tAsymmetry= "<<tAsymmetry<<" ("<<std::fabs(tAsymmetry)-1.<<")\n"; |
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335 | // } |
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336 | return lAsymmetry; |
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337 | } |
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338 | |
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339 | |
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