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 | // |
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27 | // |
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28 | // =========================================================================== |
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29 | // GEANT4 class source file |
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30 | // |
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31 | // Class: G4IonParametrisedLossModel |
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32 | // |
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33 | // Base class: G4VEmModel (utils) |
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34 | // |
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35 | // Author: Anton Lechner (Anton.Lechner@cern.ch) |
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36 | // |
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37 | // First implementation: 10. 11. 2008 |
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38 | // |
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39 | // Modifications: 03. 02. 2009 - Bug fix iterators (AL) |
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40 | // |
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41 | // |
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42 | // Class description: |
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43 | // Model for computing the energy loss of ions by employing a |
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44 | // parameterisation of dE/dx tables (by default ICRU 73 tables). For |
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45 | // ion-material combinations and/or projectile energies not covered |
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46 | // by this model, the G4BraggIonModel and G4BetheBloch models are |
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47 | // employed. |
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48 | // |
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49 | // Comments: |
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50 | // |
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51 | // =========================================================================== |
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52 | |
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53 | |
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54 | #include "G4IonParametrisedLossModel.hh" |
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55 | #include "G4MaterialStoppingICRU73.hh" |
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56 | #include "G4SimpleMaterialStoppingICRU73.hh" |
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57 | #include "G4BraggIonModel.hh" |
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58 | #include "G4BetheBlochModel.hh" |
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59 | #include "G4ParticleChangeForLoss.hh" |
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60 | #include "G4LossTableManager.hh" |
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61 | #include "G4GenericIon.hh" |
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62 | #include "G4Electron.hh" |
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63 | #include "Randomize.hh" |
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64 | |
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65 | |
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66 | G4IonParametrisedLossModel::G4IonParametrisedLossModel( |
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67 | const G4ParticleDefinition*, |
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68 | const G4String& name) |
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69 | : G4VEmModel(name), |
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70 | braggIonModel(0), |
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71 | betheBlochModel(0), |
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72 | nmbBins(90), |
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73 | nmbSubBins(100), |
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74 | particleChangeLoss(0), |
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75 | modelIsInitialised(false), |
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76 | corrections(0), |
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77 | corrFactor(1.0), |
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78 | energyLossLimit(0.15), |
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79 | cutEnergies(0) { |
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80 | |
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81 | genericIon = G4GenericIon::Definition(); |
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82 | genericIonPDGMass = genericIon -> GetPDGMass(); |
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83 | |
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84 | // The upper limit of the current model is set to 100 TeV |
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85 | SetHighEnergyLimit(100.0 * TeV); |
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86 | |
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87 | // The Bragg ion and Bethe Bloch models are instantiated |
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88 | braggIonModel = new G4BraggIonModel(); |
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89 | betheBlochModel = new G4BetheBlochModel(); |
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90 | |
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91 | // By default ICRU 73 stopping power tables are loaded |
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92 | AddDEDXTable<G4SimpleMaterialStoppingICRU73>(); |
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93 | AddDEDXTable<G4MaterialStoppingICRU73>(); |
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94 | |
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95 | // The boundaries for the range tables are set |
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96 | lowerEnergyEdgeIntegr = 0.025 * MeV; |
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97 | upperEnergyEdgeIntegr = betheBlochModel -> HighEnergyLimit(); |
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98 | |
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99 | // Cached parameters are reset |
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100 | cacheParticle = 0; |
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101 | cacheMass = 0; |
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102 | cacheElecMassRatio = 0; |
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103 | cacheChargeSquare = 0; |
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104 | |
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105 | // Cached parameters are reset |
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106 | dedxCacheParticle = 0; |
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107 | dedxCacheMaterial = 0; |
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108 | dedxCacheEnergyCut = 0; |
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109 | dedxCacheIter = lossTableList.end(); |
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110 | dedxCacheTransitionEnergy = 0.0; |
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111 | dedxCacheTransitionFactor = 0.0; |
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112 | dedxCacheGenIonMassRatio = 0.0; |
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113 | } |
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114 | |
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115 | |
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116 | G4IonParametrisedLossModel::~G4IonParametrisedLossModel() { |
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117 | |
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118 | // Range vs energy table objects are deleted and the container is cleared |
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119 | RangeEnergyTable::iterator iterRange = r.begin(); |
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120 | RangeEnergyTable::iterator iterRange_end = r.end(); |
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121 | |
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122 | for(;iterRange != iterRange_end; iterRange++) delete iterRange -> second; |
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123 | r.clear(); |
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124 | |
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125 | // Energy vs range table objects are deleted and the container is cleared |
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126 | EnergyRangeTable::iterator iterEnergy = E.begin(); |
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127 | EnergyRangeTable::iterator iterEnergy_end = E.end(); |
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128 | |
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129 | for(;iterEnergy != iterEnergy_end; iterEnergy++) delete iterEnergy -> second; |
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130 | E.clear(); |
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131 | |
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132 | // dE/dx table objects are deleted and the container is cleared |
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133 | LossTableList::iterator iterTables = lossTableList.begin(); |
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134 | LossTableList::iterator iterTables_end = lossTableList.end(); |
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135 | |
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136 | for(;iterTables != iterTables_end; iterTables++) delete *iterTables; |
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137 | lossTableList.clear(); |
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138 | |
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139 | // The Bragg ion and Bethe Bloch objects are deleted |
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140 | delete betheBlochModel; |
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141 | delete braggIonModel; |
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142 | } |
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143 | |
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144 | |
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145 | G4double G4IonParametrisedLossModel::MinEnergyCut( |
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146 | const G4ParticleDefinition*, |
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147 | const G4MaterialCutsCouple* couple) { |
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148 | |
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149 | return couple -> GetMaterial() -> GetIonisation() -> |
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150 | GetMeanExcitationEnergy(); |
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151 | } |
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152 | |
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153 | |
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154 | void G4IonParametrisedLossModel::Initialise( |
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155 | const G4ParticleDefinition* particle, |
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156 | const G4DataVector& cuts) { |
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157 | |
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158 | // Cached parameters are reset |
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159 | cacheParticle = 0; |
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160 | cacheMass = 0; |
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161 | cacheElecMassRatio = 0; |
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162 | cacheChargeSquare = 0; |
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163 | |
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164 | // Cached parameters are reset |
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165 | dedxCacheParticle = 0; |
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166 | dedxCacheMaterial = 0; |
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167 | dedxCacheEnergyCut = 0; |
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168 | dedxCacheIter = lossTableList.end(); |
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169 | dedxCacheTransitionEnergy = 0.0; |
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170 | dedxCacheTransitionFactor = 0.0; |
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171 | dedxCacheGenIonMassRatio = 0.0; |
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172 | |
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173 | // The cache of loss tables is cleared |
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174 | LossTableList::iterator iterTables = lossTableList.begin(); |
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175 | LossTableList::iterator iterTables_end = lossTableList.end(); |
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176 | |
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177 | for(;iterTables != iterTables_end; iterTables++) |
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178 | (*iterTables) -> ClearCache(); |
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179 | |
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180 | // Range vs energy and energy vs range vectors from previous runs are |
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181 | // cleared |
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182 | RangeEnergyTable::iterator iterRange = r.begin(); |
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183 | RangeEnergyTable::iterator iterRange_end = r.end(); |
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184 | |
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185 | for(;iterRange != iterRange_end; iterRange++) delete iterRange -> second; |
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186 | r.clear(); |
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187 | |
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188 | EnergyRangeTable::iterator iterEnergy = E.begin(); |
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189 | EnergyRangeTable::iterator iterEnergy_end = E.end(); |
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190 | |
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191 | for(;iterEnergy != iterEnergy_end; iterEnergy++) delete iterEnergy -> second; |
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192 | E.clear(); |
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193 | |
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194 | // The cut energies are (re)loaded |
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195 | size_t size = cuts.size(); |
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196 | cutEnergies.clear(); |
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197 | for(size_t i = 0; i < size; i++) cutEnergies.push_back(cuts[i]); |
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198 | |
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199 | // The particle change object is cast to G4ParticleChangeForLoss |
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200 | if(! modelIsInitialised) { |
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201 | |
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202 | modelIsInitialised = true; |
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203 | corrections = G4LossTableManager::Instance() -> EmCorrections(); |
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204 | |
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205 | if(!particleChangeLoss) { |
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206 | if(pParticleChange) { |
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207 | |
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208 | particleChangeLoss = reinterpret_cast<G4ParticleChangeForLoss*> |
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209 | (pParticleChange); |
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210 | } |
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211 | else { |
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212 | particleChangeLoss = new G4ParticleChangeForLoss(); |
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213 | } |
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214 | } |
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215 | } |
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216 | |
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217 | // The G4BraggIonModel and G4BetheBlochModel instances are initialised with |
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218 | // the same settings as the current model: |
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219 | braggIonModel -> Initialise(particle, cuts); |
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220 | betheBlochModel -> Initialise(particle, cuts); |
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221 | } |
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222 | |
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223 | |
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224 | G4double G4IonParametrisedLossModel::ComputeCrossSectionPerAtom( |
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225 | const G4ParticleDefinition* particle, |
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226 | G4double kineticEnergy, |
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227 | G4double atomicNumber, |
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228 | G4double, |
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229 | G4double cutEnergy, |
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230 | G4double maxKinEnergy) { |
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231 | |
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232 | // ############## Cross section per atom ################################ |
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233 | // Function computes ionization cross section per atom |
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234 | // |
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235 | // See Geant4 physics reference manual (version 9.1), section 9.1.3 |
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236 | // |
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237 | // Ref.: W.M. Yao et al, Jour. of Phys. G 33 (2006) 1. |
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238 | // B. Rossi, High energy particles, New York, NY: Prentice-Hall (1952). |
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239 | // |
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240 | // (Implementation adapted from G4BraggIonModel) |
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241 | |
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242 | G4double crosssection = 0.0; |
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243 | G4double tmax = MaxSecondaryEnergy(particle, kineticEnergy); |
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244 | G4double maxEnergy = std::min(tmax, maxKinEnergy); |
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245 | |
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246 | if(cutEnergy < tmax) { |
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247 | |
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248 | G4double energy = kineticEnergy + cacheMass; |
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249 | G4double betaSquared = kineticEnergy * |
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250 | (energy + cacheMass) / (energy * energy); |
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251 | |
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252 | crosssection = 1.0 / cutEnergy - 1.0 / maxEnergy - |
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253 | betaSquared * std::log(maxEnergy / cutEnergy) / tmax; |
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254 | |
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255 | crosssection *= twopi_mc2_rcl2 * cacheChargeSquare / betaSquared; |
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256 | } |
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257 | |
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258 | #ifdef PRINT_DEBUG_CS |
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259 | G4cout << "########################################################" |
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260 | << G4endl |
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261 | << "# G4IonParametrisedLossModel::ComputeCrossSectionPerAtom" |
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262 | << G4endl |
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263 | << "# particle =" << particle -> GetParticleName() |
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264 | << G4endl |
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265 | << "# cut(MeV) = " << cutEnergy/MeV |
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266 | << G4endl; |
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267 | |
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268 | G4cout << "#" |
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269 | << std::setw(13) << std::right << "E(MeV)" |
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270 | << std::setw(14) << "CS(um)" |
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271 | << std::setw(14) << "E_max_sec(MeV)" |
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272 | << G4endl |
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273 | << "# ------------------------------------------------------" |
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274 | << G4endl; |
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275 | |
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276 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
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277 | << std::setw(14) << crosssection / (um * um) |
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278 | << std::setw(14) << tmax / MeV |
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279 | << G4endl; |
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280 | #endif |
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281 | |
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282 | crosssection *= atomicNumber; |
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283 | |
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284 | return crosssection; |
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285 | } |
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286 | |
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287 | |
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288 | G4double G4IonParametrisedLossModel::CrossSectionPerVolume( |
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289 | const G4Material* material, |
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290 | const G4ParticleDefinition* particle, |
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291 | G4double kineticEnergy, |
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292 | G4double cutEnergy, |
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293 | G4double maxEnergy) { |
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294 | |
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295 | G4double nbElecPerVolume = material -> GetTotNbOfElectPerVolume(); |
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296 | G4double cross = ComputeCrossSectionPerAtom(particle, |
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297 | kineticEnergy, |
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298 | nbElecPerVolume, 0, |
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299 | cutEnergy, |
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300 | maxEnergy); |
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301 | |
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302 | return cross; |
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303 | } |
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304 | |
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305 | |
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306 | G4double G4IonParametrisedLossModel::ComputeDEDXPerVolume( |
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307 | const G4Material* material, |
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308 | const G4ParticleDefinition* particle, |
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309 | G4double kineticEnergy, |
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310 | G4double cutEnergy) { |
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311 | |
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312 | // ############## dE/dx ################################################## |
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313 | // Function computes dE/dx values, where following rules are adopted: |
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314 | // A. If the ion-material pair is covered by any native ion data |
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315 | // parameterisation, then: |
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316 | // * This parameterization is used for energies below a given energy |
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317 | // limit, |
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318 | // * whereas above the limit the Bethe-Bloch model is applied, in |
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319 | // combination with an effective charge estimate and high order |
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320 | // correction terms. |
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321 | // A smoothing procedure is applied to dE/dx values computed with |
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322 | // the second approach. The smoothing factor is based on the dE/dx |
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323 | // values of both approaches at the transition energy (high order |
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324 | // correction terms are included in the calculation of the transition |
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325 | // factor). |
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326 | // B. If the particle is a generic ion, the BraggIon and Bethe-Bloch |
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327 | // models are used and a smoothing procedure is applied to values |
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328 | // obtained with the second approach. |
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329 | // C. If the ion-material is not covered by any ion data parameterization |
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330 | // then: |
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331 | // * The BraggIon model is used for energies below a given energy |
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332 | // limit, |
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333 | // * whereas above the limit the Bethe-Bloch model is applied, in |
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334 | // combination with an effective charge estimate and high order |
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335 | // correction terms. |
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336 | // Also in this case, a smoothing procedure is applied to dE/dx values |
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337 | // computed with the second model. |
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338 | |
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339 | G4double dEdx = 0.0; |
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340 | UpdateDEDXCache(particle, material, cutEnergy); |
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341 | |
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342 | LossTableList::iterator iter = dedxCacheIter; |
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343 | |
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344 | if(iter != lossTableList.end()) { |
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345 | |
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346 | G4double transitionEnergy = dedxCacheTransitionEnergy; |
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347 | |
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348 | if(transitionEnergy > kineticEnergy) { |
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349 | |
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350 | dEdx = (*iter) -> GetDEDX(particle, material, kineticEnergy); |
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351 | |
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352 | G4double dEdxDeltaRays = DeltaRayMeanEnergyTransferRate(material, |
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353 | particle, |
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354 | kineticEnergy, |
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355 | cutEnergy); |
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356 | dEdx -= dEdxDeltaRays; |
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357 | } |
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358 | else { |
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359 | G4double massRatio = dedxCacheGenIonMassRatio; |
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360 | |
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361 | G4double chargeSquare = |
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362 | GetChargeSquareRatio(particle, material, kineticEnergy); |
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363 | |
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364 | G4double scaledKineticEnergy = kineticEnergy * massRatio; |
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365 | G4double scaledTransitionEnergy = transitionEnergy * massRatio; |
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366 | |
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367 | G4double lowEnergyLimit = betheBlochModel -> LowEnergyLimit(); |
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368 | |
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369 | if(scaledTransitionEnergy >= lowEnergyLimit) { |
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370 | |
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371 | G4double factor = 1.0 + dedxCacheTransitionFactor / |
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372 | kineticEnergy; |
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373 | |
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374 | dEdx = betheBlochModel -> ComputeDEDXPerVolume( |
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375 | material, genericIon, |
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376 | scaledKineticEnergy, cutEnergy); |
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377 | dEdx *= factor; |
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378 | |
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379 | } |
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380 | dEdx *= chargeSquare; |
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381 | |
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382 | dEdx += corrections -> ComputeIonCorrections(particle, |
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383 | material, kineticEnergy); |
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384 | } |
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385 | } |
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386 | else { |
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387 | G4double massRatio = 1.0; |
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388 | G4double chargeSquare = 1.0; |
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389 | |
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390 | if(particle != genericIon) { |
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391 | |
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392 | chargeSquare = GetChargeSquareRatio(particle, material, kineticEnergy); |
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393 | massRatio = genericIonPDGMass / particle -> GetPDGMass(); |
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394 | } |
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395 | |
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396 | G4double scaledKineticEnergy = kineticEnergy * massRatio; |
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397 | |
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398 | G4double lowEnergyLimit = betheBlochModel -> LowEnergyLimit(); |
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399 | if(scaledKineticEnergy < lowEnergyLimit) { |
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400 | dEdx = braggIonModel -> ComputeDEDXPerVolume( |
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401 | material, genericIon, |
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402 | scaledKineticEnergy, cutEnergy); |
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403 | |
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404 | dEdx *= chargeSquare; |
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405 | } |
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406 | else { |
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407 | G4double dEdxLimitParam = braggIonModel -> ComputeDEDXPerVolume( |
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408 | material, genericIon, |
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409 | lowEnergyLimit, cutEnergy); |
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410 | |
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411 | G4double dEdxLimitBetheBloch = betheBlochModel -> ComputeDEDXPerVolume( |
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412 | material, genericIon, |
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413 | lowEnergyLimit, cutEnergy); |
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414 | |
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415 | if(particle != genericIon) { |
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416 | G4double chargeSquareLowEnergyLimit = |
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417 | GetChargeSquareRatio(particle, material, |
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418 | lowEnergyLimit / massRatio); |
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419 | |
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420 | dEdxLimitParam *= chargeSquareLowEnergyLimit; |
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421 | dEdxLimitBetheBloch *= chargeSquareLowEnergyLimit; |
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422 | |
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423 | dEdxLimitBetheBloch += |
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424 | corrections -> ComputeIonCorrections(particle, |
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425 | material, lowEnergyLimit / massRatio); |
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426 | } |
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427 | |
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428 | G4double factor = (1.0 + (dEdxLimitParam/dEdxLimitBetheBloch - 1.0) |
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429 | * lowEnergyLimit / scaledKineticEnergy); |
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430 | |
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431 | dEdx = betheBlochModel -> ComputeDEDXPerVolume( |
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432 | material, genericIon, |
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433 | scaledKineticEnergy, cutEnergy); |
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434 | dEdx *= factor; |
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435 | |
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436 | dEdx *= chargeSquare; |
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437 | |
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438 | if(particle != genericIon) { |
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439 | dEdx += corrections -> ComputeIonCorrections(particle, |
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440 | material, kineticEnergy); |
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441 | } |
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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 | if (dEdx < 0.0) dEdx = 0.0; |
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447 | |
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448 | #ifdef PRINT_DEBUG |
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449 | |
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450 | G4cout << "########################################################" |
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451 | << G4endl |
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452 | << "# G4IonParametrisedLossModel::ComputeDEDXPerVolume" |
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453 | << G4endl |
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454 | << "# Material =" << material -> GetName() |
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455 | << G4endl |
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456 | << "# Particle = " << particle -> GetParticleName() |
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457 | << G4endl; |
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458 | << "# Cut energy (MeV) = " << cutEnergy/MeV |
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459 | << G4endl; |
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460 | |
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461 | G4cout << "#" |
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462 | << std::setw(13) << std::right << "E(MeV)" |
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463 | << std::setw(14) << "dE/dx(keV/um)" |
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464 | << std::setw(14) << "d:dE/dx(keV/um)" |
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465 | << std::setw(14) << "(d:dE/dx)/dE/dx" |
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466 | << G4endl |
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467 | << "# ------------------------------------------------------" |
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468 | << G4endl; |
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469 | |
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470 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
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471 | << std::setw(14) << (dEdx + dEdXDeltaRays) / keV * um |
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472 | << std::setw(14) << dEdXDeltaRays / keV * um |
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473 | << std::setw(14) << dEdXDeltaRays / (dEdx + dEdXDeltaRays) * 100.0 |
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474 | << G4endl; |
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475 | #endif |
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476 | |
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477 | return dEdx; |
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478 | } |
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479 | |
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480 | |
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481 | void G4IonParametrisedLossModel::PrintDEDXTable( |
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482 | const G4ParticleDefinition* particle, // Projectile (ion) |
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483 | const G4Material* material, // Absorber material |
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484 | G4double lowerBoundary, // Minimum energy per nucleon |
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485 | G4double upperBoundary, // Maximum energy per nucleon |
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486 | G4int nmbBins, // Number of bins |
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487 | G4bool logScaleEnergy) { // Logarithmic scaling of energy |
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488 | |
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489 | G4double atomicMassNumber = particle -> GetAtomicMass(); |
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490 | G4double materialDensity = material -> GetDensity(); |
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491 | |
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492 | G4cout << "# dE/dx table for " << particle -> GetParticleName() |
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493 | << " in material " << material -> GetName() |
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494 | << " of density " << materialDensity / g * cm3 |
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495 | << " g/cm3" |
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496 | << G4endl |
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497 | << "# Projectile mass number A1 = " << atomicMassNumber |
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498 | << G4endl |
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499 | << "# ------------------------------------------------------" |
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500 | << G4endl; |
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501 | G4cout << "#" |
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502 | << std::setw(13) << std::right << "E" |
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503 | << std::setw(14) << "E/A1" |
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504 | << std::setw(14) << "dE/dx" |
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505 | << std::setw(14) << "1/rho*dE/dx" |
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506 | << G4endl; |
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507 | G4cout << "#" |
---|
508 | << std::setw(13) << std::right << "(MeV)" |
---|
509 | << std::setw(14) << "(MeV)" |
---|
510 | << std::setw(14) << "(MeV/mm)" |
---|
511 | << std::setw(14) << "(MeV*cm2/mg)" |
---|
512 | << G4endl |
---|
513 | << "# ------------------------------------------------------" |
---|
514 | << G4endl; |
---|
515 | |
---|
516 | G4double energyLowerBoundary = lowerBoundary * atomicMassNumber; |
---|
517 | G4double energyUpperBoundary = upperBoundary * atomicMassNumber; |
---|
518 | |
---|
519 | if(logScaleEnergy) { |
---|
520 | |
---|
521 | energyLowerBoundary = std::log(energyLowerBoundary); |
---|
522 | energyUpperBoundary = std::log(energyUpperBoundary); |
---|
523 | } |
---|
524 | |
---|
525 | G4double deltaEnergy = (energyUpperBoundary - energyLowerBoundary) / |
---|
526 | G4double(nmbBins); |
---|
527 | |
---|
528 | for(int i = 0; i < nmbBins + 1; i++) { |
---|
529 | |
---|
530 | G4double energy = energyLowerBoundary + i * deltaEnergy; |
---|
531 | if(logScaleEnergy) energy = std::exp(energy); |
---|
532 | |
---|
533 | G4double dedx = ComputeDEDXPerVolume(material, particle, energy, DBL_MAX); |
---|
534 | G4cout.precision(6); |
---|
535 | G4cout << std::setw(14) << std::right << energy / MeV |
---|
536 | << std::setw(14) << energy / atomicMassNumber / MeV |
---|
537 | << std::setw(14) << dedx / MeV * mm |
---|
538 | << std::setw(14) << dedx / materialDensity / (MeV*cm2/(0.001*g)) |
---|
539 | << G4endl; |
---|
540 | } |
---|
541 | } |
---|
542 | |
---|
543 | |
---|
544 | void G4IonParametrisedLossModel::SampleSecondaries( |
---|
545 | std::vector<G4DynamicParticle*>* secondaries, |
---|
546 | const G4MaterialCutsCouple*, |
---|
547 | const G4DynamicParticle* particle, |
---|
548 | G4double cutKinEnergySec, |
---|
549 | G4double userMaxKinEnergySec) { |
---|
550 | |
---|
551 | |
---|
552 | // ############## Sampling of secondaries ################################# |
---|
553 | // The probability density function (pdf) of the kinetic energy T of a |
---|
554 | // secondary electron may be written as: |
---|
555 | // pdf(T) = f(T) * g(T) |
---|
556 | // where |
---|
557 | // f(T) = (Tmax - Tcut) / (Tmax * Tcut) * (1 / T^2) |
---|
558 | // g(T) = 1 - beta^2 * T / Tmax |
---|
559 | // where Tmax is the maximum kinetic energy of the secondary, Tcut |
---|
560 | // is the lower energy cut and beta is the kinetic energy of the |
---|
561 | // projectile. |
---|
562 | // |
---|
563 | // Sampling of the kinetic energy of a secondary electron: |
---|
564 | // 1) T0 is sampled from f(T) using the cumulated distribution function |
---|
565 | // F(T) = int_Tcut^T f(T')dT' |
---|
566 | // 2) T is accepted or rejected by evaluating the rejection function g(T) |
---|
567 | // at the sampled energy T0 against a randomly sampled value |
---|
568 | // |
---|
569 | // |
---|
570 | // See Geant4 physics reference manual (version 9.1), section 9.1.4 |
---|
571 | // |
---|
572 | // |
---|
573 | // Reference pdf: W.M. Yao et al, Jour. of Phys. G 33 (2006) 1. |
---|
574 | // |
---|
575 | // (Implementation adapted from G4BraggIonModel) |
---|
576 | |
---|
577 | G4double rossiMaxKinEnergySec = MaxSecondaryKinEnergy(particle); |
---|
578 | G4double maxKinEnergySec = |
---|
579 | std::min(rossiMaxKinEnergySec, userMaxKinEnergySec); |
---|
580 | |
---|
581 | if(cutKinEnergySec >= maxKinEnergySec) return; |
---|
582 | |
---|
583 | G4double kineticEnergy = particle -> GetKineticEnergy(); |
---|
584 | G4ThreeVector direction = particle ->GetMomentumDirection(); |
---|
585 | |
---|
586 | G4double energy = kineticEnergy + cacheMass; |
---|
587 | G4double betaSquared = kineticEnergy * |
---|
588 | (energy + cacheMass) / (energy * energy); |
---|
589 | |
---|
590 | G4double kinEnergySec; |
---|
591 | G4double g; |
---|
592 | |
---|
593 | do { |
---|
594 | |
---|
595 | // Sampling kinetic energy from f(T) (using F(T)): |
---|
596 | G4double xi = G4UniformRand(); |
---|
597 | kinEnergySec = cutKinEnergySec * maxKinEnergySec / |
---|
598 | (maxKinEnergySec * (1.0 - xi) + cutKinEnergySec * xi); |
---|
599 | |
---|
600 | // Deriving the value of the rejection function at the obtained kinetic |
---|
601 | // energy: |
---|
602 | g = 1.0 - betaSquared * kinEnergySec / rossiMaxKinEnergySec; |
---|
603 | |
---|
604 | if(g > 1.0) { |
---|
605 | G4cout << "G4IonParametrisedLossModel::SampleSecondary Warning: " |
---|
606 | << "Majorant 1.0 < " |
---|
607 | << g << " for e= " << kinEnergySec |
---|
608 | << G4endl; |
---|
609 | } |
---|
610 | |
---|
611 | } while( G4UniformRand() >= g ); |
---|
612 | |
---|
613 | G4double momentumSec = |
---|
614 | std::sqrt(kinEnergySec * (kinEnergySec + 2.0 * electron_mass_c2)); |
---|
615 | |
---|
616 | G4double totMomentum = energy*std::sqrt(betaSquared); |
---|
617 | G4double cost = kinEnergySec * (energy + electron_mass_c2) / |
---|
618 | (momentumSec * totMomentum); |
---|
619 | if(cost > 1.0) cost = 1.0; |
---|
620 | G4double sint = std::sqrt((1.0 - cost)*(1.0 + cost)); |
---|
621 | |
---|
622 | G4double phi = twopi * G4UniformRand() ; |
---|
623 | |
---|
624 | G4ThreeVector directionSec(sint*std::cos(phi),sint*std::sin(phi), cost) ; |
---|
625 | directionSec.rotateUz(direction); |
---|
626 | |
---|
627 | // create G4DynamicParticle object for delta ray |
---|
628 | G4DynamicParticle* delta = new G4DynamicParticle(G4Electron::Definition(), |
---|
629 | directionSec, |
---|
630 | kinEnergySec); |
---|
631 | |
---|
632 | secondaries -> push_back(delta); |
---|
633 | |
---|
634 | // Change kinematics of primary particle |
---|
635 | kineticEnergy -= kinEnergySec; |
---|
636 | G4ThreeVector finalP = direction*totMomentum - directionSec*momentumSec; |
---|
637 | finalP = finalP.unit(); |
---|
638 | |
---|
639 | particleChangeLoss -> SetProposedKineticEnergy(kineticEnergy); |
---|
640 | particleChangeLoss -> SetProposedMomentumDirection(finalP); |
---|
641 | } |
---|
642 | |
---|
643 | |
---|
644 | void G4IonParametrisedLossModel::UpdateDEDXCache( |
---|
645 | const G4ParticleDefinition* particle, |
---|
646 | const G4Material* material, |
---|
647 | G4double cutEnergy) { |
---|
648 | |
---|
649 | // ############## Caching ################################################## |
---|
650 | // If the ion-material combination is covered by any native ion data |
---|
651 | // parameterisation (for low energies), a transition factor is computed |
---|
652 | // which is applied to Bethe-Bloch results at higher energies to |
---|
653 | // guarantee a smooth transition. |
---|
654 | // This factor only needs to be calculated for the first step an ion |
---|
655 | // performs inside a certain material. |
---|
656 | |
---|
657 | if(particle == dedxCacheParticle && |
---|
658 | material == dedxCacheMaterial && |
---|
659 | cutEnergy == dedxCacheEnergyCut) { |
---|
660 | } |
---|
661 | else { |
---|
662 | |
---|
663 | dedxCacheParticle = particle; |
---|
664 | dedxCacheMaterial = material; |
---|
665 | dedxCacheEnergyCut = cutEnergy; |
---|
666 | |
---|
667 | G4double massRatio = genericIonPDGMass / particle -> GetPDGMass(); |
---|
668 | dedxCacheGenIonMassRatio = massRatio; |
---|
669 | |
---|
670 | LossTableList::iterator iter = IsApplicable(particle, material); |
---|
671 | dedxCacheIter = iter; |
---|
672 | |
---|
673 | // If any table is applicable, the transition factor is computed: |
---|
674 | if(iter != lossTableList.end()) { |
---|
675 | |
---|
676 | // Retrieving the transition energy from the parameterisation table |
---|
677 | G4double transitionEnergy = |
---|
678 | (*iter) -> GetUpperEnergyEdge(particle, material); |
---|
679 | dedxCacheTransitionEnergy = transitionEnergy; |
---|
680 | |
---|
681 | // Computing dE/dx from low-energy parameterisation at |
---|
682 | // transition energy |
---|
683 | G4double dEdxParam = (*iter) -> GetDEDX(particle, material, |
---|
684 | transitionEnergy); |
---|
685 | |
---|
686 | G4double dEdxDeltaRays = DeltaRayMeanEnergyTransferRate(material, |
---|
687 | particle, |
---|
688 | transitionEnergy, |
---|
689 | cutEnergy); |
---|
690 | dEdxParam -= dEdxDeltaRays; |
---|
691 | |
---|
692 | // Computing dE/dx from Bethe-Bloch formula at transition |
---|
693 | // energy |
---|
694 | G4double transitionChargeSquare = |
---|
695 | GetChargeSquareRatio(particle, material, transitionEnergy); |
---|
696 | |
---|
697 | G4double scaledTransitionEnergy = transitionEnergy * massRatio; |
---|
698 | |
---|
699 | G4double dEdxBetheBloch = |
---|
700 | betheBlochModel -> ComputeDEDXPerVolume( |
---|
701 | material, genericIon, |
---|
702 | scaledTransitionEnergy, cutEnergy); |
---|
703 | dEdxBetheBloch *= transitionChargeSquare; |
---|
704 | |
---|
705 | // Additionally, high order corrections are added |
---|
706 | dEdxBetheBloch += |
---|
707 | corrections -> ComputeIonCorrections(particle, |
---|
708 | material, transitionEnergy); |
---|
709 | |
---|
710 | // Computing transition factor from both dE/dx values |
---|
711 | dedxCacheTransitionFactor = |
---|
712 | (dEdxParam - dEdxBetheBloch)/dEdxBetheBloch |
---|
713 | * transitionEnergy; |
---|
714 | |
---|
715 | // Build range-energy and energy-range vectors if they don't exist |
---|
716 | IonMatCouple ionMatCouple = std::make_pair(particle, material); |
---|
717 | RangeEnergyTable::iterator iterRange = r.find(ionMatCouple); |
---|
718 | |
---|
719 | if(iterRange == r.end()) BuildRangeVector(particle, material, |
---|
720 | cutEnergy); |
---|
721 | |
---|
722 | dedxCacheEnergyRange = E[ionMatCouple]; |
---|
723 | dedxCacheRangeEnergy = r[ionMatCouple]; |
---|
724 | } |
---|
725 | else { |
---|
726 | |
---|
727 | dedxCacheParticle = particle; |
---|
728 | dedxCacheMaterial = material; |
---|
729 | dedxCacheEnergyCut = cutEnergy; |
---|
730 | |
---|
731 | dedxCacheGenIonMassRatio = |
---|
732 | genericIonPDGMass / particle -> GetPDGMass(); |
---|
733 | |
---|
734 | dedxCacheTransitionEnergy = 0.0; |
---|
735 | dedxCacheTransitionFactor = 0.0; |
---|
736 | dedxCacheEnergyRange = 0; |
---|
737 | dedxCacheRangeEnergy = 0; |
---|
738 | } |
---|
739 | } |
---|
740 | } |
---|
741 | |
---|
742 | |
---|
743 | void G4IonParametrisedLossModel::CorrectionsAlongStep( |
---|
744 | const G4MaterialCutsCouple* couple, |
---|
745 | const G4DynamicParticle* dynamicParticle, |
---|
746 | G4double& eloss, |
---|
747 | G4double&, |
---|
748 | G4double length) { |
---|
749 | |
---|
750 | // ############## Corrections for along step energy loss calculation ###### |
---|
751 | // The computed energy loss (due to electronic stopping) is overwritten |
---|
752 | // by this function if an ion data parameterization is available for the |
---|
753 | // current ion-material pair. |
---|
754 | // No action on the energy loss (due to electronic stopping) is performed |
---|
755 | // if no parameterization is available. In this case the original |
---|
756 | // generic ion tables (in combination with the effective charge) are used |
---|
757 | // in the along step DoIt function. |
---|
758 | // |
---|
759 | // Contributon due to nuclear stopping are applied in any case (given the |
---|
760 | // nuclear stopping flag is set). |
---|
761 | // |
---|
762 | // (Implementation partly adapted from G4BraggIonModel/G4BetheBlochModel) |
---|
763 | |
---|
764 | const G4ParticleDefinition* particle = dynamicParticle -> GetDefinition(); |
---|
765 | const G4Material* material = couple -> GetMaterial(); |
---|
766 | |
---|
767 | G4double kineticEnergy = dynamicParticle -> GetKineticEnergy(); |
---|
768 | |
---|
769 | G4double cutEnergy = DBL_MAX; |
---|
770 | size_t cutIndex = couple -> GetIndex(); |
---|
771 | cutEnergy = cutEnergies[cutIndex]; |
---|
772 | |
---|
773 | UpdateDEDXCache(particle, material, cutEnergy); |
---|
774 | |
---|
775 | LossTableList::iterator iter = dedxCacheIter; |
---|
776 | |
---|
777 | // If parameterization for ions is available the electronic energy loss |
---|
778 | // is overwritten |
---|
779 | if(iter != lossTableList.end()) { |
---|
780 | |
---|
781 | // The energy loss is calculated using the ComputeDEDXPerVolume function |
---|
782 | // and the step length (it is assumed that dE/dx does not change |
---|
783 | // considerably along the step) |
---|
784 | eloss = |
---|
785 | length * ComputeDEDXPerVolume(material, particle, |
---|
786 | kineticEnergy, cutEnergy); |
---|
787 | |
---|
788 | #ifdef PRINT_DEBUG |
---|
789 | G4cout.precision(6); |
---|
790 | G4cout << "########################################################" |
---|
791 | << G4endl |
---|
792 | << "# G4IonParametrisedLossModel::CorrectionsAlongStep" |
---|
793 | << G4endl |
---|
794 | << "# cut(MeV) = " << cutEnergy/MeV |
---|
795 | << G4endl; |
---|
796 | |
---|
797 | G4cout << "#" |
---|
798 | << std::setw(13) << std::right << "E(MeV)" |
---|
799 | << std::setw(14) << "l(um)" |
---|
800 | << std::setw(14) << "l*dE/dx(MeV)" |
---|
801 | << std::setw(14) << "(l*dE/dx)/E" |
---|
802 | << G4endl |
---|
803 | << "# ------------------------------------------------------" |
---|
804 | << G4endl; |
---|
805 | |
---|
806 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
---|
807 | << std::setw(14) << length / um |
---|
808 | << std::setw(14) << eloss / MeV |
---|
809 | << std::setw(14) << eloss / kineticEnergy * 100.0 |
---|
810 | << G4endl; |
---|
811 | #endif |
---|
812 | |
---|
813 | // If the energy loss exceeds a certain fraction of the kinetic energy |
---|
814 | // (the fraction is indicated by the parameter "energyLossLimit") then |
---|
815 | // the range tables are used to derive a more accurate value of the |
---|
816 | // energy loss |
---|
817 | if(eloss > energyLossLimit * kineticEnergy) { |
---|
818 | |
---|
819 | eloss = ComputeLossForStep(material, particle, |
---|
820 | kineticEnergy, cutEnergy,length); |
---|
821 | |
---|
822 | #ifdef PRINT_DEBUG |
---|
823 | G4cout << "# Correction applied:" |
---|
824 | << G4endl; |
---|
825 | |
---|
826 | G4cout << std::setw(14) << std::right << kineticEnergy / MeV |
---|
827 | << std::setw(14) << length / um |
---|
828 | << std::setw(14) << eloss / MeV |
---|
829 | << std::setw(14) << eloss / kineticEnergy * 100.0 |
---|
830 | << G4endl; |
---|
831 | #endif |
---|
832 | |
---|
833 | } |
---|
834 | |
---|
835 | } |
---|
836 | |
---|
837 | // For all corrections below a kinetic energy between the Pre- and |
---|
838 | // Post-step energy values is used |
---|
839 | G4double energy = kineticEnergy - eloss * 0.5; |
---|
840 | if(energy < 0.0) energy = kineticEnergy * 0.5; |
---|
841 | |
---|
842 | G4double chargeSquareRatio = corrections -> |
---|
843 | EffectiveChargeSquareRatio(particle, |
---|
844 | material, |
---|
845 | energy); |
---|
846 | GetModelOfFluctuations() -> SetParticleAndCharge(particle, |
---|
847 | chargeSquareRatio); |
---|
848 | |
---|
849 | // A correction is applied considering the change of the effective charge |
---|
850 | // along the step (the parameter "corrFactor" refers to the effective |
---|
851 | // charge at the beginning of the step). Note: the correction is not |
---|
852 | // applied for energy loss values deriving directly from parameterized |
---|
853 | // ion stopping power tables |
---|
854 | G4double transitionEnergy = dedxCacheTransitionEnergy; |
---|
855 | |
---|
856 | if(iter != lossTableList.end() && transitionEnergy < kineticEnergy) { |
---|
857 | chargeSquareRatio *= corrections -> EffectiveChargeCorrection(particle, |
---|
858 | material, |
---|
859 | energy); |
---|
860 | |
---|
861 | G4double chargeSquareRatioCorr = chargeSquareRatio/corrFactor; |
---|
862 | eloss *= chargeSquareRatioCorr; |
---|
863 | } |
---|
864 | else if (iter == lossTableList.end()) { |
---|
865 | |
---|
866 | chargeSquareRatio *= corrections -> EffectiveChargeCorrection(particle, |
---|
867 | material, |
---|
868 | energy); |
---|
869 | |
---|
870 | G4double chargeSquareRatioCorr = chargeSquareRatio/corrFactor; |
---|
871 | eloss *= chargeSquareRatioCorr; |
---|
872 | } |
---|
873 | |
---|
874 | // Ion high order corrections are applied if the current model does not |
---|
875 | // overwrite the energy loss (i.e. when the effective charge approach is |
---|
876 | // used) |
---|
877 | if(iter == lossTableList.end()) { |
---|
878 | |
---|
879 | G4double scaledKineticEnergy = kineticEnergy * dedxCacheGenIonMassRatio; |
---|
880 | G4double lowEnergyLimit = betheBlochModel -> LowEnergyLimit(); |
---|
881 | |
---|
882 | // Corrections are only applied in the Bethe-Bloch energy region |
---|
883 | if(scaledKineticEnergy > lowEnergyLimit) |
---|
884 | eloss += length * |
---|
885 | corrections -> IonHighOrderCorrections(particle, couple, energy); |
---|
886 | } |
---|
887 | |
---|
888 | // Nuclear stopping |
---|
889 | G4double scaledKineticEnergy = kineticEnergy * dedxCacheGenIonMassRatio; |
---|
890 | G4double charge = particle->GetPDGCharge()/eplus; |
---|
891 | G4double chargeSquare = charge * charge; |
---|
892 | |
---|
893 | if(nuclearStopping && scaledKineticEnergy < chargeSquare * 100.0 * MeV) { |
---|
894 | |
---|
895 | G4double nloss = |
---|
896 | length * corrections -> NuclearDEDX(particle, material, energy, false); |
---|
897 | |
---|
898 | if(eloss + nloss > kineticEnergy) { |
---|
899 | |
---|
900 | nloss *= (kineticEnergy / (eloss + nloss)); |
---|
901 | eloss = kineticEnergy; |
---|
902 | } else { |
---|
903 | eloss += nloss; |
---|
904 | } |
---|
905 | |
---|
906 | particleChangeLoss -> ProposeNonIonizingEnergyDeposit(nloss); |
---|
907 | } |
---|
908 | |
---|
909 | } |
---|
910 | |
---|
911 | |
---|
912 | void G4IonParametrisedLossModel::BuildRangeVector( |
---|
913 | const G4ParticleDefinition* particle, |
---|
914 | const G4Material* material, |
---|
915 | G4double cutEnergy) { |
---|
916 | |
---|
917 | G4double massRatio = genericIonPDGMass / particle -> GetPDGMass(); |
---|
918 | |
---|
919 | G4double lowerEnergy = lowerEnergyEdgeIntegr / massRatio; |
---|
920 | G4double upperEnergy = upperEnergyEdgeIntegr / massRatio; |
---|
921 | |
---|
922 | G4double logLowerEnergyEdge = std::log(lowerEnergy); |
---|
923 | G4double logUpperEnergyEdge = std::log(upperEnergy); |
---|
924 | |
---|
925 | G4double logDeltaEnergy = (logUpperEnergyEdge - logLowerEnergyEdge) / |
---|
926 | G4double(nmbBins); |
---|
927 | |
---|
928 | G4double logDeltaIntegr = logDeltaEnergy / G4double(nmbSubBins); |
---|
929 | |
---|
930 | G4LPhysicsFreeVector* energyRangeVector = |
---|
931 | new G4LPhysicsFreeVector(nmbBins+1, |
---|
932 | lowerEnergy, |
---|
933 | upperEnergy); |
---|
934 | energyRangeVector -> SetSpline(true); |
---|
935 | |
---|
936 | G4double dedxLow = ComputeDEDXPerVolume(material, |
---|
937 | particle, |
---|
938 | lowerEnergy, |
---|
939 | cutEnergy); |
---|
940 | |
---|
941 | G4double range = 2.0 * lowerEnergy / dedxLow; |
---|
942 | |
---|
943 | energyRangeVector -> PutValues(0, lowerEnergy, range); |
---|
944 | |
---|
945 | G4double logEnergy = std::log(lowerEnergy); |
---|
946 | for(size_t i = 1; i < nmbBins+1; i++) { |
---|
947 | |
---|
948 | G4double logEnergyIntegr = logEnergy; |
---|
949 | |
---|
950 | for(size_t j = 0; j < nmbSubBins; j++) { |
---|
951 | |
---|
952 | G4double binLowerBoundary = std::exp(logEnergyIntegr); |
---|
953 | logEnergyIntegr += logDeltaIntegr; |
---|
954 | |
---|
955 | G4double binUpperBoundary = std::exp(logEnergyIntegr); |
---|
956 | G4double deltaIntegr = binUpperBoundary - binLowerBoundary; |
---|
957 | |
---|
958 | G4double energyIntegr = binLowerBoundary + 0.5 * deltaIntegr; |
---|
959 | |
---|
960 | G4double dedxValue = ComputeDEDXPerVolume(material, |
---|
961 | particle, |
---|
962 | energyIntegr, |
---|
963 | cutEnergy); |
---|
964 | |
---|
965 | if(dedxValue > 0.0) range += deltaIntegr / dedxValue; |
---|
966 | |
---|
967 | #ifdef PRINT_DEBUG_DETAILS |
---|
968 | G4cout << " E = "<< energyIntegr/MeV |
---|
969 | << " MeV -> dE = " << deltaIntegr/MeV |
---|
970 | << " MeV -> dE/dx = " << dedxValue/MeV*mm |
---|
971 | << " MeV/mm -> dE/(dE/dx) = " << deltaIntegr / |
---|
972 | dedxValue / mm |
---|
973 | << " mm -> range = " << range / mm |
---|
974 | << " mm " << G4endl; |
---|
975 | #endif |
---|
976 | } |
---|
977 | |
---|
978 | logEnergy += logDeltaEnergy; |
---|
979 | |
---|
980 | G4double energy = std::exp(logEnergy); |
---|
981 | |
---|
982 | energyRangeVector -> PutValues(i, energy, range); |
---|
983 | |
---|
984 | #ifdef PRINT_DEBUG_DETAILS |
---|
985 | G4cout << "G4IonParametrisedLossModel::BuildRangeVector() bin = " |
---|
986 | << i <<", E = " |
---|
987 | << energy / MeV << " MeV, R = " |
---|
988 | << range / mm << " mm" |
---|
989 | << G4endl; |
---|
990 | #endif |
---|
991 | |
---|
992 | } |
---|
993 | |
---|
994 | G4bool b; |
---|
995 | |
---|
996 | G4double lowerRangeEdge = |
---|
997 | energyRangeVector -> GetValue(lowerEnergy, b); |
---|
998 | G4double upperRangeEdge = |
---|
999 | energyRangeVector -> GetValue(upperEnergy, b); |
---|
1000 | |
---|
1001 | G4LPhysicsFreeVector* rangeEnergyVector |
---|
1002 | = new G4LPhysicsFreeVector(nmbBins+1, |
---|
1003 | lowerRangeEdge, |
---|
1004 | upperRangeEdge); |
---|
1005 | rangeEnergyVector -> SetSpline(true); |
---|
1006 | |
---|
1007 | for(size_t i = 0; i < nmbBins+1; i++) { |
---|
1008 | G4double energy = energyRangeVector -> GetLowEdgeEnergy(i); |
---|
1009 | rangeEnergyVector -> |
---|
1010 | PutValues(i, energyRangeVector -> GetValue(energy, b), energy); |
---|
1011 | } |
---|
1012 | |
---|
1013 | #ifdef PRINT_DEBUG_TABLES |
---|
1014 | G4cout << *energyLossVector |
---|
1015 | << *energyRangeVector |
---|
1016 | << *rangeEnergyVector << G4endl; |
---|
1017 | #endif |
---|
1018 | |
---|
1019 | IonMatCouple ionMatCouple = std::make_pair(particle, material); |
---|
1020 | |
---|
1021 | E[ionMatCouple] = energyRangeVector; |
---|
1022 | r[ionMatCouple] = rangeEnergyVector; |
---|
1023 | } |
---|
1024 | |
---|
1025 | |
---|
1026 | G4double G4IonParametrisedLossModel::ComputeLossForStep( |
---|
1027 | const G4Material* material, |
---|
1028 | const G4ParticleDefinition* particle, |
---|
1029 | G4double kineticEnergy, |
---|
1030 | G4double cutEnergy, |
---|
1031 | G4double stepLength) { |
---|
1032 | |
---|
1033 | G4double loss = 0.0; |
---|
1034 | |
---|
1035 | UpdateDEDXCache(particle, material, cutEnergy); |
---|
1036 | |
---|
1037 | G4PhysicsVector* energyRange = dedxCacheEnergyRange; |
---|
1038 | G4PhysicsVector* rangeEnergy = dedxCacheRangeEnergy; |
---|
1039 | |
---|
1040 | if(energyRange != 0 && rangeEnergy != 0) { |
---|
1041 | G4bool b; |
---|
1042 | |
---|
1043 | // Computing range for pre-step kinetic energy: |
---|
1044 | G4double range = energyRange -> GetValue(kineticEnergy, b); |
---|
1045 | |
---|
1046 | #ifdef PRINT_DEBUG |
---|
1047 | G4cout << "G4IonParametrisedLossModel::ComputeLossForStep() range = " |
---|
1048 | << range / mm << " mm, step = " << stepLength / mm << " mm" |
---|
1049 | << G4endl; |
---|
1050 | #endif |
---|
1051 | |
---|
1052 | // If range is smaller than step length, the loss is set to kinetic |
---|
1053 | // energy |
---|
1054 | if(range <= stepLength) loss = kineticEnergy; |
---|
1055 | else { |
---|
1056 | |
---|
1057 | G4double energy = rangeEnergy -> GetValue(range - stepLength, b); |
---|
1058 | |
---|
1059 | loss = kineticEnergy - energy; |
---|
1060 | |
---|
1061 | if(loss < 0.0) loss = 0.0; |
---|
1062 | } |
---|
1063 | |
---|
1064 | #ifdef PRINT_DEBUG |
---|
1065 | G4cout << "G4IonParametrisedLossModel::ComputeLossForStep() E = " |
---|
1066 | << kineticEnergy / MeV << " MeV * " |
---|
1067 | << value.energyScaling << " = " |
---|
1068 | << kineticEnergy * value.energyScaling / MeV |
---|
1069 | << " MeV, dE/dx = " << dedx / MeV * cm << " MeV/cm = " |
---|
1070 | << dedx/factor/MeV*cm << " * " << factor << " MeV/cm; index = " |
---|
1071 | << value.dEdxIndex << ", material = " << material -> GetName() |
---|
1072 | << G4endl; |
---|
1073 | #endif |
---|
1074 | |
---|
1075 | } |
---|
1076 | |
---|
1077 | return loss; |
---|
1078 | } |
---|