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 | // $Id: G4PenelopeCompton.cc,v 1.26 2006/06/29 19:40:41 gunter Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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28 | // |
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29 | // Author: Luciano Pandola |
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30 | // |
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31 | // History: |
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32 | // -------- |
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33 | // 12 Feb 2003 MG Pia const argument in SelectRandomAtomForCompton |
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34 | // Migration to "cuts per region" |
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35 | // 14 Feb 2003 MG Pia Corrected compilation errors and warnings |
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36 | // from SUN |
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37 | // Modified some variables to lowercase initial |
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38 | // 10 Mar 2003 V.Ivanchenko Remove CutPerMaterial warning |
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39 | // 13 Mar 2003 L.Pandola Code "cleaned" |
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40 | // 20 Mar 2003 L.Pandola ReadData() changed (performance improved) |
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41 | // 26 Mar 2003 L.Pandola Added fluorescence |
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42 | // 24 May 2003 MGP Removed memory leak |
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43 | // 09 Mar 2004 L.Pandola Bug fixed in the generation of final state |
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44 | // (bug report # 585) |
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45 | // 17 Mar 2004 L.Pandola Removed unnecessary calls to std::pow(a,b) |
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46 | // 18 Mar 2004 L.Pandola Use of std::map (code review) |
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47 | // |
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48 | // ------------------------------------------------------------------- |
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49 | |
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50 | #include "G4PenelopeCompton.hh" |
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51 | #include "Randomize.hh" |
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52 | #include "G4ParticleDefinition.hh" |
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53 | #include "G4Track.hh" |
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54 | #include "G4Step.hh" |
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55 | #include "G4ForceCondition.hh" |
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56 | #include "G4Gamma.hh" |
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57 | #include "G4Electron.hh" |
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58 | #include "G4DynamicParticle.hh" |
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59 | #include "G4VParticleChange.hh" |
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60 | #include "G4ThreeVector.hh" |
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61 | #include "G4EnergyLossTables.hh" |
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62 | #include "G4VCrossSectionHandler.hh" |
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63 | #include "G4CrossSectionHandler.hh" |
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64 | #include "G4VEMDataSet.hh" |
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65 | #include "G4EMDataSet.hh" |
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66 | #include "G4CompositeEMDataSet.hh" |
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67 | #include "G4VDataSetAlgorithm.hh" |
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68 | #include "G4LogLogInterpolation.hh" |
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69 | #include "G4VRangeTest.hh" |
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70 | #include "G4RangeTest.hh" |
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71 | #include "G4ProductionCutsTable.hh" |
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72 | #include "G4AtomicTransitionManager.hh" |
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73 | #include "G4AtomicShell.hh" |
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74 | #include "G4AtomicDeexcitation.hh" |
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75 | #include "G4PenelopeIntegrator.hh" |
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76 | #include "G4MaterialCutsCouple.hh" |
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77 | |
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78 | |
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79 | G4PenelopeCompton::G4PenelopeCompton(const G4String& processName) |
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80 | : G4VDiscreteProcess(processName), |
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81 | lowEnergyLimit(250*eV), |
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82 | highEnergyLimit(100*GeV), |
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83 | intrinsicLowEnergyLimit(10*eV), |
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84 | intrinsicHighEnergyLimit(100*GeV), |
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85 | energyForIntegration(0.0), |
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86 | ZForIntegration(1), |
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87 | nBins(200), |
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88 | cutForLowEnergySecondaryPhotons(250.0*eV) |
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89 | { |
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90 | if (lowEnergyLimit < intrinsicLowEnergyLimit || |
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91 | highEnergyLimit > intrinsicHighEnergyLimit) |
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92 | { |
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93 | G4Exception("G4PenelopeCompton::G4PenelopeCompton - energy outside intrinsic process validity range"); |
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94 | } |
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95 | |
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96 | meanFreePathTable = 0; |
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97 | ionizationEnergy = new std::map<G4int,G4DataVector*>; |
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98 | hartreeFunction = new std::map<G4int,G4DataVector*>; |
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99 | occupationNumber = new std::map<G4int,G4DataVector*>; |
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100 | |
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101 | rangeTest = new G4RangeTest; |
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102 | |
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103 | ReadData(); //Read data from file |
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104 | |
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105 | if (verboseLevel > 0) |
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106 | { |
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107 | G4cout << GetProcessName() << " is created " << G4endl |
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108 | << "Energy range: " |
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109 | << lowEnergyLimit / keV << " keV - " |
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110 | << highEnergyLimit / GeV << " GeV" |
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111 | << G4endl; |
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112 | } |
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113 | } |
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114 | |
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115 | G4PenelopeCompton::~G4PenelopeCompton() |
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116 | { |
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117 | delete meanFreePathTable; |
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118 | delete rangeTest; |
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119 | |
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120 | for (size_t i1=0;i1<matCrossSections->size();i1++) |
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121 | { |
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122 | delete (*matCrossSections)[i1]; |
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123 | } |
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124 | |
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125 | delete matCrossSections; |
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126 | |
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127 | for (G4int Z=1;Z<100;Z++) |
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128 | { |
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129 | if (ionizationEnergy->count(Z)) delete (ionizationEnergy->find(Z)->second); |
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130 | if (hartreeFunction->count(Z)) delete (hartreeFunction->find(Z)->second); |
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131 | if (occupationNumber->count(Z)) delete (occupationNumber->find(Z)->second); |
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132 | } |
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133 | delete ionizationEnergy; |
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134 | delete hartreeFunction; |
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135 | delete occupationNumber; |
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136 | } |
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137 | |
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138 | void G4PenelopeCompton::BuildPhysicsTable(const G4ParticleDefinition& ) |
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139 | { |
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140 | G4DataVector energyVector; |
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141 | G4double dBin = std::log10(highEnergyLimit/lowEnergyLimit)/nBins; |
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142 | G4int i; |
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143 | for (i=0;i<nBins;i++) |
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144 | { |
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145 | energyVector.push_back(std::pow(10.,std::log10(lowEnergyLimit)+i*dBin)); |
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146 | } |
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147 | |
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148 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
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149 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
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150 | G4VDataSetAlgorithm* algo = new G4LogLogInterpolation(); |
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151 | |
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152 | size_t nOfBins = energyVector.size(); |
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153 | size_t bin=0; |
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154 | |
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155 | G4DataVector* energies; |
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156 | G4DataVector* data; |
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157 | |
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158 | matCrossSections = new std::vector<G4VEMDataSet*>; |
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159 | |
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160 | |
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161 | G4int m; |
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162 | for (m=0; m<nMaterials; m++) |
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163 | { |
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164 | const G4Material* material= (*materialTable)[m]; |
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165 | G4int nElements = material->GetNumberOfElements(); |
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166 | const G4ElementVector* elementVector = material->GetElementVector(); |
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167 | const G4double* nAtomsPerVolume = material->GetAtomicNumDensityVector(); |
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168 | |
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169 | G4VEMDataSet* setForMat = new G4CompositeEMDataSet(algo,1.,1.); |
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170 | |
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171 | for (i=0; i<nElements; i++) { |
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172 | |
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173 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
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174 | G4double density = nAtomsPerVolume[i]; |
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175 | G4double cross=0.0; |
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176 | energies = new G4DataVector; |
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177 | data = new G4DataVector; |
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178 | |
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179 | |
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180 | for (bin=0; bin<nOfBins; bin++) |
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181 | { |
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182 | G4double e = energyVector[bin]; |
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183 | energies->push_back(e); |
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184 | cross = density * CrossSection(e,Z); |
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185 | data->push_back(cross); |
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186 | } |
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187 | |
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188 | G4VEMDataSet* elSet = new G4EMDataSet(i,energies,data,algo,1.,1.); |
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189 | setForMat->AddComponent(elSet); |
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190 | } |
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191 | |
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192 | matCrossSections->push_back(setForMat); |
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193 | } |
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194 | |
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195 | |
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196 | //Build the mean free path table! |
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197 | G4double matCS = 0.0; |
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198 | G4VEMDataSet* matCrossSet = new G4CompositeEMDataSet(algo,1.,1.); |
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199 | G4VEMDataSet* materialSet = new G4CompositeEMDataSet(algo,1.,1.); |
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200 | |
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201 | |
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202 | for (m=0; m<nMaterials; m++) |
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203 | { |
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204 | energies = new G4DataVector; |
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205 | data = new G4DataVector; |
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206 | const G4Material* material= (*materialTable)[m]; |
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207 | material= (*materialTable)[m]; |
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208 | for (bin=0; bin<nOfBins; bin++) |
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209 | { |
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210 | G4double energy = energyVector[bin]; |
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211 | energies->push_back(energy); |
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212 | matCrossSet = (*matCrossSections)[m]; |
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213 | matCS = 0.0; |
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214 | G4int nElm = matCrossSet->NumberOfComponents(); |
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215 | for(G4int j=0; j<nElm; j++) { |
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216 | matCS += matCrossSet->GetComponent(j)->FindValue(energy); |
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217 | } |
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218 | if (matCS > 0.) |
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219 | { |
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220 | data->push_back(1./matCS); |
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221 | } |
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222 | else |
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223 | { |
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224 | data->push_back(DBL_MAX); |
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225 | } |
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226 | } |
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227 | G4VEMDataSet* dataSet = new G4EMDataSet(m,energies,data,algo,1.,1.); |
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228 | materialSet->AddComponent(dataSet); |
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229 | } |
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230 | meanFreePathTable = materialSet; |
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231 | } |
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232 | |
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233 | G4VParticleChange* G4PenelopeCompton::PostStepDoIt(const G4Track& aTrack, |
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234 | const G4Step& aStep) |
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235 | { |
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236 | //Penelope model |
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237 | |
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238 | aParticleChange.Initialize(aTrack); |
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239 | |
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240 | // Dynamic particle quantities |
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241 | const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle(); |
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242 | G4double photonEnergy0 = incidentPhoton->GetKineticEnergy(); |
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243 | |
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244 | if (photonEnergy0 <= lowEnergyLimit) |
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245 | { |
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246 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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247 | aParticleChange.ProposeEnergy(0.); |
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248 | aParticleChange.ProposeLocalEnergyDeposit(photonEnergy0); |
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249 | return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep); |
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250 | } |
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251 | |
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252 | G4ParticleMomentum photonDirection0 = incidentPhoton->GetMomentumDirection(); |
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253 | |
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254 | const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple(); |
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255 | const G4Material* material = couple->GetMaterial(); |
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256 | G4int Z = SelectRandomAtomForCompton(material,photonEnergy0); |
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257 | const G4int nmax = 64; |
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258 | G4double rn[nmax],pac[nmax]; |
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259 | |
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260 | G4double ki,ki1,ki2,ki3,taumin,a1,a2; |
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261 | G4double tau,TST; |
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262 | G4double S=0.0; |
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263 | G4double epsilon,cosTheta; |
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264 | G4double harFunc = 0.0; |
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265 | G4int occupNb= 0; |
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266 | G4double ionEnergy=0.0; |
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267 | G4int nosc = occupationNumber->find(Z)->second->size(); |
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268 | G4int iosc = nosc; |
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269 | ki = photonEnergy0/electron_mass_c2; |
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270 | ki2 = 2*ki+1.0; |
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271 | ki3 = ki*ki; |
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272 | ki1 = ki3-ki2-1.0; |
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273 | taumin = 1.0/ki2; |
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274 | a1 = std::log(ki2); |
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275 | a2 = a1+2.0*ki*(1.0+ki)/(ki2*ki2); |
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276 | if (photonEnergy0 > 5*MeV) |
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277 | { |
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278 | do{ |
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279 | do{ |
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280 | if ((a2*G4UniformRand()) < a1) |
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281 | { |
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282 | tau = std::pow(taumin,G4UniformRand()); |
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283 | } |
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284 | else |
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285 | { |
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286 | tau = std::sqrt(1.0+G4UniformRand()*(taumin*taumin-1.0)); |
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287 | } |
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288 | //rejection function |
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289 | TST = (1+tau*(ki1+tau*(ki2+tau*ki3)))/(ki3*tau*(1.0+tau*tau)); |
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290 | }while (G4UniformRand()> TST); |
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291 | epsilon=tau; |
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292 | cosTheta = 1.0 - (1.0-tau)/(ki*tau); |
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293 | //Target shell electrons |
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294 | TST = Z*G4UniformRand(); |
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295 | iosc = nosc; |
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296 | S=0.0; |
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297 | for (G4int j=0;j<nosc;j++) |
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298 | { |
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299 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[j]; |
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300 | S = S + occupNb; |
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301 | if (S > TST) iosc = j; |
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302 | if (S > TST) break; |
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303 | } |
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304 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[iosc]; |
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305 | }while((epsilon*photonEnergy0-photonEnergy0+ionEnergy) >0); |
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306 | } |
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307 | |
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308 | else //photonEnergy0<5 MeV |
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309 | { |
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310 | //Incoherent scattering function for theta=PI |
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311 | G4double s0=0.0; |
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312 | G4double pzomc=0.0,rni=0.0; |
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313 | G4double aux=0.0; |
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314 | for (G4int i=0;i<nosc;i++){ |
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315 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
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316 | if (photonEnergy0 > ionEnergy) |
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317 | { |
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318 | G4double aux = photonEnergy0*(photonEnergy0-ionEnergy)*2.0; |
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319 | harFunc = (*(hartreeFunction->find(Z)->second))[i]/fine_structure_const; |
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320 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
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321 | pzomc = harFunc*(aux-electron_mass_c2*ionEnergy)/ |
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322 | (electron_mass_c2*std::sqrt(2.0*aux+ionEnergy*ionEnergy)); |
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323 | if (pzomc > 0) |
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324 | { |
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325 | rni = 1.0-0.5*std::exp(0.5-(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)); |
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326 | } |
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327 | else |
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328 | { |
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329 | rni = 0.5*std::exp(0.5-(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)); |
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330 | } |
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331 | s0 = s0 + occupNb*rni; |
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332 | } |
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333 | } |
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334 | |
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335 | //Sampling tau |
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336 | G4double cdt1; |
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337 | do |
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338 | { |
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339 | if ((G4UniformRand()*a2) < a1) |
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340 | { |
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341 | tau = std::pow(taumin,G4UniformRand()); |
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342 | } |
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343 | else |
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344 | { |
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345 | tau = std::sqrt(1.0+G4UniformRand()*(taumin*taumin-1.0)); |
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346 | } |
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347 | cdt1 = (1.0-tau)/(ki*tau); |
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348 | S=0.0; |
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349 | //Incoherent scattering function |
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350 | for (G4int i=0;i<nosc;i++){ |
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351 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
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352 | if (photonEnergy0 > ionEnergy) //sum only on excitable levels |
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353 | { |
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354 | aux = photonEnergy0*(photonEnergy0-ionEnergy)*cdt1; |
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355 | harFunc = (*(hartreeFunction->find(Z)->second))[i]/fine_structure_const; |
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356 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
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357 | pzomc = harFunc*(aux-electron_mass_c2*ionEnergy)/ |
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358 | (electron_mass_c2*std::sqrt(2.0*aux+ionEnergy*ionEnergy)); |
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359 | if (pzomc > 0) |
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360 | { |
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361 | rn[i] = 1.0-0.5*std::exp(0.5-(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)+std::sqrt(2.0)*pzomc)); |
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362 | } |
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363 | else |
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364 | { |
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365 | rn[i] = 0.5*std::exp(0.5-(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)*(std::sqrt(0.5)-std::sqrt(2.0)*pzomc)); |
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366 | } |
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367 | S = S + occupNb*rn[i]; |
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368 | pac[i] = S; |
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369 | } |
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370 | else |
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371 | { |
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372 | pac[i] = S-(1e-06); |
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373 | } |
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374 | } |
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375 | //Rejection function |
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376 | TST = S*(1.0+tau*(ki1+tau*(ki2+tau*ki3)))/(ki3*tau*(1.0+tau*tau)); |
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377 | }while ((G4UniformRand()*s0) > TST); |
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378 | |
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379 | //Target electron shell |
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380 | cosTheta = 1.0 - cdt1; |
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381 | G4double fpzmax=0.0,fpz=0.0; |
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382 | G4double A=0.0; |
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383 | do |
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384 | { |
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385 | do |
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386 | { |
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387 | TST =S*G4UniformRand(); |
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388 | iosc=nosc; |
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389 | for (G4int i=0;i<nosc;i++){ |
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390 | if (pac[i]>TST) iosc = i; |
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391 | if (pac[i]>TST) break; |
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392 | } |
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393 | A = G4UniformRand()*rn[iosc]; |
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394 | harFunc = (*(hartreeFunction->find(Z)->second))[iosc]/fine_structure_const; |
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395 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[iosc]; |
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396 | if (A < 0.5) { |
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397 | pzomc = (std::sqrt(0.5)-std::sqrt(0.5-std::log(2.0*A)))/ |
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398 | (std::sqrt(2.0)*harFunc); |
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399 | } |
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400 | else |
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401 | { |
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402 | pzomc = (std::sqrt(0.5-std::log(2.0-2.0*A))-std::sqrt(0.5))/ |
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403 | (std::sqrt(2.0)*harFunc); |
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404 | } |
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405 | } while (pzomc < -1); |
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406 | // F(EP) rejection |
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407 | G4double XQC = 1.0+tau*(tau-2.0*cosTheta); |
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408 | G4double AF = std::sqrt(XQC)*(1.0+tau*(tau-cosTheta)/XQC); |
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409 | if (AF > 0) { |
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410 | fpzmax = 1.0+AF*0.2; |
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411 | } |
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412 | else |
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413 | { |
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414 | fpzmax = 1.0-AF*0.2; |
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415 | } |
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416 | fpz = 1.0+AF*std::max(std::min(pzomc,0.2),-0.2); |
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417 | }while ((fpzmax*G4UniformRand())>fpz); |
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418 | |
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419 | //Energy of the scattered photon |
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420 | G4double T = pzomc*pzomc; |
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421 | G4double b1 = 1.0-T*tau*tau; |
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422 | G4double b2 = 1.0-T*tau*cosTheta; |
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423 | if (pzomc > 0.0) |
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424 | { |
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425 | epsilon = (tau/b1)*(b2+std::sqrt(std::abs(b2*b2-b1*(1.0-T)))); |
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426 | } |
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427 | else |
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428 | { |
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429 | epsilon = (tau/b1)*(b2-std::sqrt(std::abs(b2*b2-b1*(1.0-T)))); |
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430 | } |
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431 | } |
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432 | |
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433 | |
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434 | G4double sinTheta = std::sqrt(1-cosTheta*cosTheta); |
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435 | G4double phi = twopi * G4UniformRand() ; |
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436 | G4double dirx = sinTheta * std::cos(phi); |
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437 | G4double diry = sinTheta * std::sin(phi); |
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438 | G4double dirz = cosTheta ; |
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439 | |
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440 | // Update G4VParticleChange for the scattered photon |
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441 | |
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442 | G4ThreeVector photonDirection1(dirx,diry,dirz); |
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443 | photonDirection1.rotateUz(photonDirection0); |
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444 | aParticleChange.ProposeMomentumDirection(photonDirection1) ; |
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445 | G4double photonEnergy1 = epsilon * photonEnergy0; |
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446 | |
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447 | if (photonEnergy1 > 0.) |
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448 | { |
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449 | aParticleChange.ProposeEnergy(photonEnergy1) ; |
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450 | } |
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451 | else |
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452 | { |
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453 | aParticleChange.ProposeEnergy(0.) ; |
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454 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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455 | } |
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456 | |
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457 | |
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458 | // Kinematics of the scattered electron |
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459 | |
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460 | |
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461 | G4double diffEnergy = photonEnergy0*(1-epsilon); |
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462 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[iosc]; |
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463 | //G4double eKineticEnergy = diffEnergy - ionEnergy; |
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464 | G4double Q2 = photonEnergy0*photonEnergy0+photonEnergy1*(photonEnergy1-2.0*photonEnergy0*cosTheta); |
---|
465 | G4double cosThetaE; //scattering angle for the electron |
---|
466 | if (Q2 > 1.0e-12) |
---|
467 | { |
---|
468 | cosThetaE = (photonEnergy0-photonEnergy1*cosTheta)/std::sqrt(Q2); |
---|
469 | } |
---|
470 | else |
---|
471 | { |
---|
472 | cosThetaE = 1.0; |
---|
473 | } |
---|
474 | G4double sinThetaE = std::sqrt(1-cosThetaE*cosThetaE); |
---|
475 | |
---|
476 | |
---|
477 | |
---|
478 | const G4AtomicTransitionManager* transitionManager = G4AtomicTransitionManager::Instance(); |
---|
479 | const G4AtomicShell* shell = transitionManager->Shell(Z,iosc); |
---|
480 | G4double bindingEnergy = shell->BindingEnergy(); |
---|
481 | G4int shellId = shell->ShellId(); |
---|
482 | //G4cout << bindingEnergy/keV << " " << ionEnergy/keV << " keV" << G4endl; |
---|
483 | ionEnergy = std::max(bindingEnergy,ionEnergy); //protection against energy non-conservation |
---|
484 | G4double eKineticEnergy = diffEnergy - ionEnergy; |
---|
485 | |
---|
486 | size_t nTotPhotons=0; |
---|
487 | G4int nPhotons=0; |
---|
488 | |
---|
489 | const G4ProductionCutsTable* theCoupleTable= |
---|
490 | G4ProductionCutsTable::GetProductionCutsTable(); |
---|
491 | size_t indx = couple->GetIndex(); |
---|
492 | G4double cutg = (*(theCoupleTable->GetEnergyCutsVector(0)))[indx]; |
---|
493 | cutg = std::min(cutForLowEnergySecondaryPhotons,cutg); |
---|
494 | |
---|
495 | G4double cute = (*(theCoupleTable->GetEnergyCutsVector(1)))[indx]; |
---|
496 | cute = std::min(cutForLowEnergySecondaryPhotons,cute); |
---|
497 | |
---|
498 | std::vector<G4DynamicParticle*>* photonVector=0; |
---|
499 | G4DynamicParticle* aPhoton; |
---|
500 | G4AtomicDeexcitation deexcitationManager; |
---|
501 | |
---|
502 | if (Z>5 && (ionEnergy > cutg || ionEnergy > cute)) |
---|
503 | { |
---|
504 | photonVector = deexcitationManager.GenerateParticles(Z,shellId); |
---|
505 | nTotPhotons = photonVector->size(); |
---|
506 | for (size_t k=0;k<nTotPhotons;k++){ |
---|
507 | aPhoton = (*photonVector)[k]; |
---|
508 | if (aPhoton) |
---|
509 | { |
---|
510 | G4double itsCut = cutg; |
---|
511 | if (aPhoton->GetDefinition() == G4Electron::Electron()) itsCut = cute; |
---|
512 | G4double itsEnergy = aPhoton->GetKineticEnergy(); |
---|
513 | if (itsEnergy > itsCut && itsEnergy <= ionEnergy) |
---|
514 | { |
---|
515 | nPhotons++; |
---|
516 | ionEnergy -= itsEnergy; |
---|
517 | } |
---|
518 | else |
---|
519 | { |
---|
520 | delete aPhoton; |
---|
521 | (*photonVector)[k]=0; |
---|
522 | } |
---|
523 | } |
---|
524 | } |
---|
525 | } |
---|
526 | G4double energyDeposit =ionEnergy; //il deposito locale e' quello che rimane |
---|
527 | G4int nbOfSecondaries=nPhotons; |
---|
528 | |
---|
529 | // Generate the electron only if with large enough range w.r.t. cuts and safety |
---|
530 | G4double safety = aStep.GetPostStepPoint()->GetSafety(); |
---|
531 | G4DynamicParticle* electron = 0; |
---|
532 | if (rangeTest->Escape(G4Electron::Electron(),couple,eKineticEnergy,safety)) |
---|
533 | { |
---|
534 | G4double xEl = sinThetaE * std::cos(phi+pi); |
---|
535 | G4double yEl = sinThetaE * std::sin(phi+pi); |
---|
536 | G4double zEl = cosThetaE; |
---|
537 | G4ThreeVector eDirection(xEl,yEl,zEl); //electron direction |
---|
538 | eDirection.rotateUz(photonDirection0); |
---|
539 | electron = new G4DynamicParticle (G4Electron::Electron(), |
---|
540 | eDirection,eKineticEnergy) ; |
---|
541 | nbOfSecondaries++; |
---|
542 | } |
---|
543 | else |
---|
544 | { |
---|
545 | |
---|
546 | energyDeposit += eKineticEnergy; |
---|
547 | } |
---|
548 | |
---|
549 | aParticleChange.SetNumberOfSecondaries(nbOfSecondaries); |
---|
550 | if (electron) aParticleChange.AddSecondary(electron); |
---|
551 | for (size_t ll=0;ll<nTotPhotons;ll++) |
---|
552 | { |
---|
553 | aPhoton = (*photonVector)[ll]; |
---|
554 | if (aPhoton) aParticleChange.AddSecondary(aPhoton); |
---|
555 | } |
---|
556 | delete photonVector; |
---|
557 | if (energyDeposit < 0) |
---|
558 | { |
---|
559 | G4cout << "WARNING-" |
---|
560 | << "G4PenelopeCompton::PostStepDoIt - Negative energy deposit" |
---|
561 | << G4endl; |
---|
562 | energyDeposit=0; |
---|
563 | } |
---|
564 | aParticleChange.ProposeLocalEnergyDeposit(energyDeposit); |
---|
565 | |
---|
566 | |
---|
567 | return G4VDiscreteProcess::PostStepDoIt( aTrack, aStep); |
---|
568 | } |
---|
569 | |
---|
570 | G4bool G4PenelopeCompton::IsApplicable(const G4ParticleDefinition& particle) |
---|
571 | { |
---|
572 | return ( &particle == G4Gamma::Gamma() ); |
---|
573 | } |
---|
574 | |
---|
575 | G4double G4PenelopeCompton::GetMeanFreePath(const G4Track& track, |
---|
576 | G4double, // previousStepSize |
---|
577 | G4ForceCondition*) |
---|
578 | { |
---|
579 | const G4DynamicParticle* photon = track.GetDynamicParticle(); |
---|
580 | G4double energy = photon->GetKineticEnergy(); |
---|
581 | G4Material* material = track.GetMaterial(); |
---|
582 | size_t materialIndex = material->GetIndex(); |
---|
583 | |
---|
584 | G4double meanFreePath; |
---|
585 | if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex); |
---|
586 | else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX; |
---|
587 | else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex); |
---|
588 | return meanFreePath; |
---|
589 | } |
---|
590 | |
---|
591 | |
---|
592 | void G4PenelopeCompton::ReadData() |
---|
593 | { |
---|
594 | char* path = getenv("G4LEDATA"); |
---|
595 | if (!path) |
---|
596 | { |
---|
597 | G4String excep = "G4PenelopeCompton - G4LEDATA environment variable not set!"; |
---|
598 | G4Exception(excep); |
---|
599 | } |
---|
600 | G4String pathString(path); |
---|
601 | G4String pathFile = pathString + "/penelope/compton-pen.dat"; |
---|
602 | std::ifstream file(pathFile); |
---|
603 | std::filebuf* lsdp = file.rdbuf(); |
---|
604 | |
---|
605 | if (!(lsdp->is_open())) |
---|
606 | { |
---|
607 | G4String excep = "G4PenelopeCompton - data file " + pathFile + " not found!"; |
---|
608 | G4Exception(excep); |
---|
609 | } |
---|
610 | |
---|
611 | G4int k1,test,test1; |
---|
612 | G4double a1,a2; |
---|
613 | G4int Z=1,nLevels=0; |
---|
614 | G4DataVector* f; |
---|
615 | G4DataVector* u; |
---|
616 | G4DataVector* j; |
---|
617 | |
---|
618 | do{ |
---|
619 | f = new G4DataVector; |
---|
620 | u = new G4DataVector; |
---|
621 | j = new G4DataVector; |
---|
622 | file >> Z >> nLevels; |
---|
623 | for (G4int h=0;h<nLevels;h++){ |
---|
624 | file >> k1 >> a1 >> a2; |
---|
625 | f->push_back((G4double) k1); |
---|
626 | u->push_back(a1); |
---|
627 | j->push_back(a2); |
---|
628 | } |
---|
629 | ionizationEnergy->insert(std::make_pair(Z,u)); |
---|
630 | hartreeFunction->insert(std::make_pair(Z,j)); |
---|
631 | occupationNumber->insert(std::make_pair(Z,f)); |
---|
632 | file >> test >> test1; //-1 -1 close the data for each Z |
---|
633 | if (test > 0) { |
---|
634 | G4String excep = "G4PenelopeCompton - data file corrupted!"; |
---|
635 | G4Exception(excep); |
---|
636 | } |
---|
637 | }while (test != -2); //the very last Z is closed with -2 instead of -1 |
---|
638 | } |
---|
639 | |
---|
640 | G4double G4PenelopeCompton::CrossSection(G4double energy,G4int Z) |
---|
641 | { |
---|
642 | G4double cs=0.0; |
---|
643 | energyForIntegration=energy; |
---|
644 | ZForIntegration = Z; |
---|
645 | if (energy< 5*MeV) |
---|
646 | { |
---|
647 | G4PenelopeIntegrator<G4PenelopeCompton,G4double (G4PenelopeCompton::*)(G4double)> theIntegrator; |
---|
648 | cs = theIntegrator.Calculate(this,&G4PenelopeCompton::DifferentialCrossSection,-1.0,1.0,1e-05); |
---|
649 | } |
---|
650 | else |
---|
651 | { |
---|
652 | G4double ki=energy/electron_mass_c2; |
---|
653 | G4double ki3=ki*ki; |
---|
654 | G4double ki2=1.0+2*ki; |
---|
655 | G4double ki1=ki3-ki2-1.0; |
---|
656 | G4double t0=1.0/(ki2); |
---|
657 | G4double csl = 0.5*ki3*t0*t0+ki2*t0+ki1*std::log(t0)-(1.0/t0); |
---|
658 | G4int nosc = occupationNumber->find(Z)->second->size(); |
---|
659 | for (G4int i=0;i<nosc;i++) |
---|
660 | { |
---|
661 | G4double ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
---|
662 | G4double tau=(energy-ionEnergy)/energy; |
---|
663 | if (tau > t0) |
---|
664 | { |
---|
665 | G4double csu = 0.5*ki3*tau*tau+ki2*tau+ki1*std::log(tau)-(1.0/tau); |
---|
666 | G4int f = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
---|
667 | cs = cs + f*(csu-csl); |
---|
668 | } |
---|
669 | } |
---|
670 | cs=pi*classic_electr_radius*classic_electr_radius*cs/(ki*ki3); |
---|
671 | } |
---|
672 | return cs; |
---|
673 | } |
---|
674 | |
---|
675 | |
---|
676 | G4double G4PenelopeCompton::DifferentialCrossSection(G4double cosTheta) |
---|
677 | { |
---|
678 | const G4double k2 = std::sqrt(2.0); |
---|
679 | const G4double k1 = std::sqrt(0.5); |
---|
680 | const G4double k12 = 0.5; |
---|
681 | G4double cdt1 = 1.0-cosTheta; |
---|
682 | G4double energy = energyForIntegration; |
---|
683 | G4int Z = ZForIntegration; |
---|
684 | G4double ionEnergy=0.0,Pzimax=0.0,XKN=0.0; |
---|
685 | G4double diffCS=0.0; |
---|
686 | G4double x=0.0,siap=0.0; |
---|
687 | G4double harFunc=0.0; |
---|
688 | G4int occupNb; |
---|
689 | //energy of Compton line; |
---|
690 | G4double EOEC = 1.0+(energy/electron_mass_c2)*cdt1; |
---|
691 | G4double ECOE = 1.0/EOEC; |
---|
692 | //Incoherent scattering function (analytical profile) |
---|
693 | G4double sia = 0.0; |
---|
694 | G4int nosc = occupationNumber->find(Z)->second->size(); |
---|
695 | for (G4int i=0;i<nosc;i++){ |
---|
696 | ionEnergy = (*(ionizationEnergy->find(Z)->second))[i]; |
---|
697 | //Sum only of those shells for which E>Eion |
---|
698 | if (energy > ionEnergy) |
---|
699 | { |
---|
700 | G4double aux = energy * (energy-ionEnergy)*cdt1; |
---|
701 | Pzimax = (aux - electron_mass_c2*ionEnergy)/(electron_mass_c2*std::sqrt(2*aux+ionEnergy*ionEnergy)); |
---|
702 | harFunc = (*(hartreeFunction->find(Z)->second))[i]/fine_structure_const; |
---|
703 | occupNb = (G4int) (*(occupationNumber->find(Z)->second))[i]; |
---|
704 | x = harFunc*Pzimax; |
---|
705 | if (x > 0) |
---|
706 | { |
---|
707 | siap = 1.0-0.5*std::exp(k12-(k1+k2*x)*(k1+k2*x)); |
---|
708 | } |
---|
709 | else |
---|
710 | { |
---|
711 | siap = 0.5*std::exp(k12-(k1-k2*x)*(k1-k2*x)); |
---|
712 | } |
---|
713 | sia = sia + occupNb*siap; //sum of all contributions; |
---|
714 | } |
---|
715 | } |
---|
716 | XKN = EOEC+ECOE-1+cosTheta*cosTheta; |
---|
717 | diffCS = pi*classic_electr_radius*classic_electr_radius*ECOE*ECOE*XKN*sia; |
---|
718 | return diffCS; |
---|
719 | } |
---|
720 | |
---|
721 | G4int G4PenelopeCompton::SelectRandomAtomForCompton(const G4Material* material,G4double energy) const |
---|
722 | { |
---|
723 | G4int nElements = material->GetNumberOfElements(); |
---|
724 | //Special case: the material consists of one element |
---|
725 | if (nElements == 1) |
---|
726 | { |
---|
727 | G4int Z = (G4int) material->GetZ(); |
---|
728 | return Z; |
---|
729 | } |
---|
730 | |
---|
731 | //Composite material |
---|
732 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
733 | size_t materialIndex = material->GetIndex(); |
---|
734 | |
---|
735 | G4VEMDataSet* materialSet = (*matCrossSections)[materialIndex]; |
---|
736 | G4double materialCrossSection0 = 0.0; |
---|
737 | G4DataVector cross; |
---|
738 | cross.clear(); |
---|
739 | G4int i; |
---|
740 | for (i=0;i<nElements;i++) |
---|
741 | { |
---|
742 | G4double cr = (materialSet->GetComponent(i))->FindValue(energy); |
---|
743 | materialCrossSection0 += cr; |
---|
744 | cross.push_back(materialCrossSection0); //cumulative cross section |
---|
745 | } |
---|
746 | |
---|
747 | G4double random = G4UniformRand()*materialCrossSection0; |
---|
748 | for (i=0;i<nElements;i++) |
---|
749 | { |
---|
750 | if (random <= cross[i]) return (G4int) (*elementVector)[i]->GetZ(); |
---|
751 | } |
---|
752 | //It should never get here |
---|
753 | return 0; |
---|
754 | } |
---|
755 | |
---|