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 | // $Id: G4PixeCrossSectionHandler.cc,v 1.2 2010/11/19 17:16:21 pia Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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29 | // |
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30 | // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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31 | // |
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32 | // History: |
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33 | // ----------- |
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34 | // 16 Jun 2008 MGP Created; Cross section manager for hadron impact ionization |
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35 | // Documented in: |
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36 | // M.G. Pia et al., PIXE Simulation With Geant4, |
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37 | // IEEE Trans. Nucl. Sci., vol. 56, no. 6, pp. 3614-3649, Dec. 2009 |
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38 | // |
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39 | // ------------------------------------------------------------------- |
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40 | |
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41 | #include "G4PixeCrossSectionHandler.hh" |
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42 | #include "G4IInterpolator.hh" |
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43 | #include "G4LogLogInterpolator.hh" |
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44 | #include "G4IDataSet.hh" |
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45 | #include "G4DataSet.hh" |
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46 | #include "G4CompositeDataSet.hh" |
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47 | #include "G4PixeShellDataSet.hh" |
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48 | #include "G4ProductionCutsTable.hh" |
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49 | #include "G4Material.hh" |
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50 | #include "G4Element.hh" |
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51 | #include "Randomize.hh" |
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52 | #include "G4SystemOfUnits.hh" |
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53 | #include "G4ParticleDefinition.hh" |
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54 | |
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55 | #include <map> |
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56 | #include <vector> |
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57 | #include <fstream> |
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58 | #include <sstream> |
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59 | |
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60 | |
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61 | G4PixeCrossSectionHandler::G4PixeCrossSectionHandler() |
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62 | { |
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63 | crossSections = 0; |
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64 | interpolation = 0; |
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65 | // Initialise with default values |
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66 | Initialise(0,"","","",1.*keV,0.1*GeV,200,MeV,barn,6,92); |
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67 | ActiveElements(); |
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68 | } |
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69 | |
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70 | |
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71 | G4PixeCrossSectionHandler::G4PixeCrossSectionHandler(G4IInterpolator* algorithm, |
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72 | const G4String& modelK, |
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73 | const G4String& modelL, |
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74 | const G4String& modelM, |
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75 | G4double minE, |
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76 | G4double maxE, |
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77 | G4int bins, |
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78 | G4double unitE, |
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79 | G4double unitData, |
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80 | G4int minZ, |
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81 | G4int maxZ) |
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82 | : interpolation(algorithm), eMin(minE), eMax(maxE), nBins(bins), |
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83 | unit1(unitE), unit2(unitData), zMin(minZ), zMax(maxZ) |
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84 | { |
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85 | crossSections = 0; |
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86 | |
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87 | crossModel.push_back(modelK); |
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88 | crossModel.push_back(modelL); |
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89 | crossModel.push_back(modelM); |
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90 | |
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91 | //std::cout << "PixeCrossSectionHandler constructor - crossModel[0] = " |
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92 | // << crossModel[0] |
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93 | // << std::endl; |
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94 | |
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95 | ActiveElements(); |
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96 | } |
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97 | |
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98 | G4PixeCrossSectionHandler::~G4PixeCrossSectionHandler() |
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99 | { |
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100 | delete interpolation; |
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101 | interpolation = 0; |
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102 | std::map<G4int,G4IDataSet*,std::less<G4int> >::iterator pos; |
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103 | |
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104 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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105 | { |
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106 | // The following is a workaround for STL ObjectSpace implementation, |
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107 | // which does not support the standard and does not accept |
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108 | // the syntax pos->second |
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109 | // G4IDataSet* dataSet = pos->second; |
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110 | G4IDataSet* dataSet = (*pos).second; |
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111 | delete dataSet; |
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112 | } |
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113 | |
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114 | if (crossSections != 0) |
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115 | { |
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116 | size_t n = crossSections->size(); |
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117 | for (size_t i=0; i<n; i++) |
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118 | { |
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119 | delete (*crossSections)[i]; |
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120 | } |
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121 | delete crossSections; |
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122 | crossSections = 0; |
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123 | } |
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124 | } |
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125 | |
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126 | void G4PixeCrossSectionHandler::Initialise(G4IInterpolator* algorithm, |
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127 | const G4String& modelK, |
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128 | const G4String& modelL, |
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129 | const G4String& modelM, |
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130 | G4double minE, G4double maxE, |
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131 | G4int numberOfBins, |
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132 | G4double unitE, G4double unitData, |
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133 | G4int minZ, G4int maxZ) |
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134 | { |
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135 | if (algorithm != 0) |
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136 | { |
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137 | delete interpolation; |
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138 | interpolation = algorithm; |
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139 | } |
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140 | else |
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141 | { |
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142 | interpolation = CreateInterpolation(); |
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143 | } |
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144 | |
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145 | eMin = minE; |
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146 | eMax = maxE; |
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147 | nBins = numberOfBins; |
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148 | unit1 = unitE; |
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149 | unit2 = unitData; |
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150 | zMin = minZ; |
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151 | zMax = maxZ; |
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152 | |
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153 | crossModel.push_back(modelK); |
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154 | crossModel.push_back(modelL); |
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155 | crossModel.push_back(modelM); |
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156 | |
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157 | } |
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158 | |
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159 | void G4PixeCrossSectionHandler::PrintData() const |
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160 | { |
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161 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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162 | |
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163 | for (pos = dataMap.begin(); pos != dataMap.end(); pos++) |
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164 | { |
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165 | // The following is a workaround for STL ObjectSpace implementation, |
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166 | // which does not support the standard and does not accept |
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167 | // the syntax pos->first or pos->second |
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168 | // G4int z = pos->first; |
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169 | // G4IDataSet* dataSet = pos->second; |
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170 | G4int z = (*pos).first; |
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171 | G4IDataSet* dataSet = (*pos).second; |
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172 | G4cout << "---- Data set for Z = " |
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173 | << z |
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174 | << G4endl; |
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175 | dataSet->PrintData(); |
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176 | G4cout << "--------------------------------------------------" << G4endl; |
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177 | } |
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178 | } |
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179 | |
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180 | void G4PixeCrossSectionHandler::LoadShellData(const G4String& fileName) |
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181 | { |
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182 | size_t nZ = activeZ.size(); |
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183 | for (size_t i=0; i<nZ; i++) |
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184 | { |
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185 | G4int Z = (G4int) activeZ[i]; |
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186 | G4IInterpolator* algo = interpolation->Clone(); |
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187 | G4IDataSet* dataSet = new G4PixeShellDataSet(Z, algo,crossModel[0],crossModel[1],crossModel[2]); |
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188 | |
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189 | // Degug printing |
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190 | //std::cout << "PixeCrossSectionHandler::Load - " |
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191 | // << Z |
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192 | // << ", modelK = " |
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193 | // << crossModel[0] |
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194 | // << " fileName = " |
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195 | // << fileName |
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196 | // << std::endl; |
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197 | |
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198 | dataSet->LoadData(fileName); |
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199 | dataMap[Z] = dataSet; |
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200 | } |
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201 | |
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202 | // Build cross sections for materials if not already built |
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203 | if (! crossSections) |
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204 | { |
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205 | BuildForMaterials(); |
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206 | } |
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207 | |
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208 | } |
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209 | |
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210 | void G4PixeCrossSectionHandler::Clear() |
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211 | { |
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212 | // Reset the map of data sets: remove the data sets from the map |
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213 | std::map<G4int,G4IDataSet*,std::less<G4int> >::iterator pos; |
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214 | |
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215 | if(! dataMap.empty()) |
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216 | { |
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217 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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218 | { |
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219 | // The following is a workaround for STL ObjectSpace implementation, |
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220 | // which does not support the standard and does not accept |
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221 | // the syntax pos->first or pos->second |
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222 | // G4IDataSet* dataSet = pos->second; |
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223 | G4IDataSet* dataSet = (*pos).second; |
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224 | delete dataSet; |
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225 | dataSet = 0; |
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226 | G4int i = (*pos).first; |
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227 | dataMap[i] = 0; |
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228 | } |
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229 | dataMap.clear(); |
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230 | } |
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231 | |
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232 | activeZ.clear(); |
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233 | ActiveElements(); |
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234 | } |
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235 | |
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236 | G4double G4PixeCrossSectionHandler::FindValue(G4int Z, G4double energy) const |
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237 | { |
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238 | G4double value = 0.; |
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239 | |
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240 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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241 | pos = dataMap.find(Z); |
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242 | if (pos!= dataMap.end()) |
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243 | { |
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244 | // The following is a workaround for STL ObjectSpace implementation, |
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245 | // which does not support the standard and does not accept |
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246 | // the syntax pos->first or pos->second |
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247 | // G4IDataSet* dataSet = pos->second; |
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248 | G4IDataSet* dataSet = (*pos).second; |
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249 | value = dataSet->FindValue(energy); |
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250 | } |
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251 | else |
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252 | { |
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253 | G4cout << "WARNING: G4PixeCrossSectionHandler::FindValue(Z,e) did not find Z = " |
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254 | << Z << G4endl; |
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255 | } |
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256 | return value; |
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257 | } |
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258 | |
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259 | G4double G4PixeCrossSectionHandler::FindValue(G4int Z, G4double energy, |
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260 | G4int shellIndex) const |
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261 | { |
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262 | G4double value = 0.; |
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263 | |
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264 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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265 | pos = dataMap.find(Z); |
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266 | if (pos!= dataMap.end()) |
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267 | { |
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268 | // The following is a workaround for STL ObjectSpace implementation, |
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269 | // which does not support the standard and does not accept |
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270 | // the syntax pos->first or pos->second |
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271 | // G4IDataSet* dataSet = pos->second; |
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272 | G4IDataSet* dataSet = (*pos).second; |
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273 | if (shellIndex >= 0) |
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274 | { |
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275 | G4int nComponents = dataSet->NumberOfComponents(); |
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276 | if(shellIndex < nComponents) |
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277 | // The value is the cross section for shell component at given energy |
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278 | value = dataSet->GetComponent(shellIndex)->FindValue(energy); |
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279 | else |
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280 | { |
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281 | G4cout << "WARNING: G4PixeCrossSectionHandler::FindValue(Z,e,shell) did not find" |
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282 | << " shellIndex= " << shellIndex |
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283 | << " for Z= " |
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284 | << Z << G4endl; |
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285 | } |
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286 | } else { |
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287 | value = dataSet->FindValue(energy); |
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288 | } |
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289 | } |
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290 | else |
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291 | { |
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292 | G4cout << "WARNING: G4PixeCrossSectionHandler::FindValue did not find Z = " |
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293 | << Z << G4endl; |
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294 | } |
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295 | return value; |
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296 | } |
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297 | |
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298 | |
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299 | G4double G4PixeCrossSectionHandler::ValueForMaterial(const G4Material* material, |
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300 | G4double energy) const |
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301 | { |
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302 | G4double value = 0.; |
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303 | |
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304 | const G4ElementVector* elementVector = material->GetElementVector(); |
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305 | const G4double* nAtomsPerVolume = material->GetVecNbOfAtomsPerVolume(); |
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306 | G4int nElements = material->GetNumberOfElements(); |
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307 | |
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308 | for (G4int i=0 ; i<nElements ; i++) |
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309 | { |
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310 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
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311 | G4double elementValue = FindValue(Z,energy); |
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312 | G4double nAtomsVol = nAtomsPerVolume[i]; |
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313 | value += nAtomsVol * elementValue; |
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314 | } |
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315 | |
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316 | return value; |
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317 | } |
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318 | |
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319 | /* |
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320 | G4IDataSet* G4PixeCrossSectionHandler::BuildMeanFreePathForMaterials(const G4DataVector* energyCuts ) |
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321 | { |
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322 | // Builds a CompositeDataSet containing the mean free path for each material |
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323 | // in the material table |
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324 | |
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325 | G4DataVector energyVector; |
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326 | G4double dBin = std::log10(eMax/eMin) / nBins; |
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327 | |
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328 | for (G4int i=0; i<nBins+1; i++) |
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329 | { |
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330 | energyVector.push_back(std::pow(10., std::log10(eMin)+i*dBin)); |
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331 | } |
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332 | |
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333 | // Factory method to build cross sections in derived classes, |
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334 | // related to the type of physics process |
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335 | |
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336 | if (crossSections != 0) |
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337 | { // Reset the list of cross sections |
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338 | std::vector<G4IDataSet*>::iterator mat; |
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339 | if (! crossSections->empty()) |
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340 | { |
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341 | for (mat = crossSections->begin(); mat!= crossSections->end(); ++mat) |
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342 | { |
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343 | G4IDataSet* set = *mat; |
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344 | delete set; |
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345 | set = 0; |
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346 | } |
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347 | crossSections->clear(); |
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348 | delete crossSections; |
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349 | crossSections = 0; |
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350 | } |
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351 | } |
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352 | |
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353 | crossSections = BuildCrossSectionsForMaterials(energyVector); |
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354 | |
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355 | if (crossSections == 0) |
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356 | G4Exception("G4PixeCrossSectionHandler::BuildMeanFreePathForMaterials, crossSections = 0"); |
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357 | |
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358 | G4IInterpolator* algo = CreateInterpolation(); |
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359 | G4IDataSet* materialSet = new G4CompositeDataSet(algo); |
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360 | |
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361 | G4DataVector* energies; |
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362 | G4DataVector* data; |
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363 | |
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364 | const G4ProductionCutsTable* theCoupleTable= |
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365 | G4ProductionCutsTable::GetProductionCutsTable(); |
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366 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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367 | |
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368 | |
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369 | for (size_t m=0; m<numOfCouples; m++) |
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370 | { |
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371 | energies = new G4DataVector; |
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372 | data = new G4DataVector; |
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373 | for (G4int bin=0; bin<nBins; bin++) |
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374 | { |
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375 | G4double energy = energyVector[bin]; |
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376 | energies->push_back(energy); |
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377 | G4IDataSet* matCrossSet = (*crossSections)[m]; |
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378 | G4double materialCrossSection = 0.0; |
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379 | G4int nElm = matCrossSet->NumberOfComponents(); |
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380 | for(G4int j=0; j<nElm; j++) { |
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381 | materialCrossSection += matCrossSet->GetComponent(j)->FindValue(energy); |
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382 | } |
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383 | |
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384 | if (materialCrossSection > 0.) |
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385 | { |
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386 | data->push_back(1./materialCrossSection); |
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387 | } |
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388 | else |
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389 | { |
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390 | data->push_back(DBL_MAX); |
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391 | } |
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392 | } |
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393 | G4IInterpolator* algo = CreateInterpolation(); |
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394 | G4IDataSet* dataSet = new G4DataSet(m,energies,data,algo,1.,1.); |
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395 | materialSet->AddComponent(dataSet); |
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396 | } |
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397 | |
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398 | return materialSet; |
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399 | } |
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400 | |
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401 | */ |
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402 | |
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403 | void G4PixeCrossSectionHandler::BuildForMaterials() |
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404 | { |
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405 | // Builds a CompositeDataSet containing the mean free path for each material |
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406 | // in the material table |
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407 | |
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408 | G4DataVector energyVector; |
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409 | G4double dBin = std::log10(eMax/eMin) / nBins; |
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410 | |
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411 | for (G4int i=0; i<nBins+1; i++) |
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412 | { |
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413 | energyVector.push_back(std::pow(10., std::log10(eMin)+i*dBin)); |
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414 | } |
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415 | |
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416 | if (crossSections != 0) |
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417 | { // Reset the list of cross sections |
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418 | std::vector<G4IDataSet*>::iterator mat; |
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419 | if (! crossSections->empty()) |
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420 | { |
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421 | for (mat = crossSections->begin(); mat!= crossSections->end(); ++mat) |
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422 | { |
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423 | G4IDataSet* set = *mat; |
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424 | delete set; |
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425 | set = 0; |
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426 | } |
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427 | crossSections->clear(); |
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428 | delete crossSections; |
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429 | crossSections = 0; |
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430 | } |
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431 | } |
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432 | |
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433 | crossSections = BuildCrossSectionsForMaterials(energyVector); |
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434 | |
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435 | if (crossSections == 0) |
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436 | G4Exception("G4PixeCrossSectionHandler::BuildForMaterials, crossSections = 0"); |
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437 | |
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438 | return; |
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439 | } |
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440 | |
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441 | |
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442 | G4int G4PixeCrossSectionHandler::SelectRandomAtom(const G4Material* material, |
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443 | G4double e) const |
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444 | { |
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445 | // Select randomly an element within the material, according to the weight |
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446 | // determined by the cross sections in the data set |
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447 | |
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448 | G4int nElements = material->GetNumberOfElements(); |
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449 | |
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450 | // Special case: the material consists of one element |
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451 | if (nElements == 1) |
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452 | { |
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453 | G4int Z = (G4int) material->GetZ(); |
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454 | return Z; |
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455 | } |
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456 | |
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457 | // Composite material |
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458 | |
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459 | const G4ElementVector* elementVector = material->GetElementVector(); |
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460 | size_t materialIndex = material->GetIndex(); |
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461 | |
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462 | G4IDataSet* materialSet = (*crossSections)[materialIndex]; |
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463 | G4double materialCrossSection0 = 0.0; |
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464 | G4DataVector cross; |
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465 | cross.clear(); |
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466 | for ( G4int i=0; i < nElements; i++ ) |
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467 | { |
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468 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
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469 | materialCrossSection0 += cr; |
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470 | cross.push_back(materialCrossSection0); |
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471 | } |
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472 | |
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473 | G4double random = G4UniformRand() * materialCrossSection0; |
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474 | |
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475 | for (G4int k=0 ; k < nElements ; k++ ) |
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476 | { |
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477 | if (random <= cross[k]) return (G4int) (*elementVector)[k]->GetZ(); |
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478 | } |
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479 | // It should never get here |
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480 | return 0; |
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481 | } |
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482 | |
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483 | /* |
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484 | const G4Element* G4PixeCrossSectionHandler::SelectRandomElement(const G4MaterialCutsCouple* couple, |
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485 | G4double e) const |
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486 | { |
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487 | // Select randomly an element within the material, according to the weight determined |
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488 | // by the cross sections in the data set |
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489 | |
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490 | const G4Material* material = couple->GetMaterial(); |
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491 | G4Element* nullElement = 0; |
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492 | G4int nElements = material->GetNumberOfElements(); |
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493 | const G4ElementVector* elementVector = material->GetElementVector(); |
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494 | |
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495 | // Special case: the material consists of one element |
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496 | if (nElements == 1) |
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497 | { |
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498 | G4Element* element = (*elementVector)[0]; |
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499 | return element; |
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500 | } |
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501 | else |
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502 | { |
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503 | // Composite material |
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504 | |
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505 | size_t materialIndex = couple->GetIndex(); |
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506 | |
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507 | G4IDataSet* materialSet = (*crossSections)[materialIndex]; |
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508 | G4double materialCrossSection0 = 0.0; |
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509 | G4DataVector cross; |
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510 | cross.clear(); |
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511 | for (G4int i=0; i<nElements; i++) |
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512 | { |
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513 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
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514 | materialCrossSection0 += cr; |
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515 | cross.push_back(materialCrossSection0); |
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516 | } |
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517 | |
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518 | G4double random = G4UniformRand() * materialCrossSection0; |
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519 | |
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520 | for (G4int k=0 ; k < nElements ; k++ ) |
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521 | { |
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522 | if (random <= cross[k]) return (*elementVector)[k]; |
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523 | } |
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524 | // It should never end up here |
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525 | G4cout << "G4PixeCrossSectionHandler::SelectRandomElement - no element found" << G4endl; |
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526 | return nullElement; |
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527 | } |
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528 | } |
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529 | */ |
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530 | |
---|
531 | |
---|
532 | G4int G4PixeCrossSectionHandler::SelectRandomShell(G4int Z, G4double e) const |
---|
533 | { |
---|
534 | // Select randomly a shell, according to the weight determined by the cross sections |
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535 | // in the data set |
---|
536 | |
---|
537 | // Note for later improvement: it would be useful to add a cache mechanism for already |
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538 | // used shells to improve performance |
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539 | |
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540 | G4int shell = 0; |
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541 | |
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542 | G4double totCrossSection = FindValue(Z,e); |
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543 | G4double random = G4UniformRand() * totCrossSection; |
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544 | G4double partialSum = 0.; |
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545 | |
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546 | G4IDataSet* dataSet = 0; |
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547 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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548 | pos = dataMap.find(Z); |
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549 | // The following is a workaround for STL ObjectSpace implementation, |
---|
550 | // which does not support the standard and does not accept |
---|
551 | // the syntax pos->first or pos->second |
---|
552 | // if (pos != dataMap.end()) dataSet = pos->second; |
---|
553 | if (pos != dataMap.end()) dataSet = (*pos).second; |
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554 | |
---|
555 | size_t nShells = dataSet->NumberOfComponents(); |
---|
556 | for (size_t i=0; i<nShells; i++) |
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557 | { |
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558 | const G4IDataSet* shellDataSet = dataSet->GetComponent(i); |
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559 | if (shellDataSet != 0) |
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560 | { |
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561 | G4double value = shellDataSet->FindValue(e); |
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562 | partialSum += value; |
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563 | if (random <= partialSum) return i; |
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564 | } |
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565 | } |
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566 | // It should never get here |
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567 | return shell; |
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568 | } |
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569 | |
---|
570 | void G4PixeCrossSectionHandler::ActiveElements() |
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571 | { |
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572 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
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573 | if (materialTable == 0) |
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574 | G4Exception("G4PixeCrossSectionHandler::ActiveElements - no MaterialTable found)"); |
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575 | |
---|
576 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
---|
577 | |
---|
578 | for (G4int m=0; m<nMaterials; m++) |
---|
579 | { |
---|
580 | const G4Material* material= (*materialTable)[m]; |
---|
581 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
582 | const G4int nElements = material->GetNumberOfElements(); |
---|
583 | |
---|
584 | for (G4int iEl=0; iEl<nElements; iEl++) |
---|
585 | { |
---|
586 | G4Element* element = (*elementVector)[iEl]; |
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587 | G4double Z = element->GetZ(); |
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588 | if (!(activeZ.contains(Z)) && Z >= zMin && Z <= zMax) |
---|
589 | { |
---|
590 | activeZ.push_back(Z); |
---|
591 | } |
---|
592 | } |
---|
593 | } |
---|
594 | } |
---|
595 | |
---|
596 | G4IInterpolator* G4PixeCrossSectionHandler::CreateInterpolation() |
---|
597 | { |
---|
598 | G4IInterpolator* algorithm = new G4LogLogInterpolator; |
---|
599 | return algorithm; |
---|
600 | } |
---|
601 | |
---|
602 | G4int G4PixeCrossSectionHandler::NumberOfComponents(G4int Z) const |
---|
603 | { |
---|
604 | G4int n = 0; |
---|
605 | |
---|
606 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
---|
607 | pos = dataMap.find(Z); |
---|
608 | if (pos!= dataMap.end()) |
---|
609 | { |
---|
610 | G4IDataSet* dataSet = (*pos).second; |
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611 | n = dataSet->NumberOfComponents(); |
---|
612 | } |
---|
613 | else |
---|
614 | { |
---|
615 | G4cout << "WARNING: G4PixeCrossSectionHandler::NumberOfComponents did not " |
---|
616 | << "find Z = " |
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617 | << Z << G4endl; |
---|
618 | } |
---|
619 | return n; |
---|
620 | } |
---|
621 | |
---|
622 | |
---|
623 | std::vector<G4IDataSet*>* |
---|
624 | G4PixeCrossSectionHandler::BuildCrossSectionsForMaterials(const G4DataVector& energyVector) |
---|
625 | { |
---|
626 | G4DataVector* energies; |
---|
627 | G4DataVector* data; |
---|
628 | |
---|
629 | std::vector<G4IDataSet*>* matCrossSections = new std::vector<G4IDataSet*>; |
---|
630 | |
---|
631 | //const G4ProductionCutsTable* theCoupleTable=G4ProductionCutsTable::GetProductionCutsTable(); |
---|
632 | //size_t numOfCouples = theCoupleTable->GetTableSize(); |
---|
633 | |
---|
634 | size_t nOfBins = energyVector.size(); |
---|
635 | const G4IInterpolator* interpolationAlgo = CreateInterpolation(); |
---|
636 | |
---|
637 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
---|
638 | if (materialTable == 0) |
---|
639 | G4Exception("G4PixeCrossSectionHandler - no MaterialTable found)"); |
---|
640 | |
---|
641 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
---|
642 | |
---|
643 | for (G4int m=0; m<nMaterials; m++) |
---|
644 | { |
---|
645 | const G4Material* material = (*materialTable)[m]; |
---|
646 | G4int nElements = material->GetNumberOfElements(); |
---|
647 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
648 | const G4double* nAtomsPerVolume = material->GetAtomicNumDensityVector(); |
---|
649 | |
---|
650 | G4IInterpolator* algo = interpolationAlgo->Clone(); |
---|
651 | |
---|
652 | G4IDataSet* setForMat = new G4CompositeDataSet(algo,1.,1.); |
---|
653 | |
---|
654 | for (G4int i=0; i<nElements; i++) { |
---|
655 | |
---|
656 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
---|
657 | G4double density = nAtomsPerVolume[i]; |
---|
658 | |
---|
659 | energies = new G4DataVector; |
---|
660 | data = new G4DataVector; |
---|
661 | |
---|
662 | |
---|
663 | for (size_t bin=0; bin<nOfBins; bin++) |
---|
664 | { |
---|
665 | G4double e = energyVector[bin]; |
---|
666 | energies->push_back(e); |
---|
667 | G4double cross = 0.; |
---|
668 | if (Z >= zMin && Z <= zMax) cross = density*FindValue(Z,e); |
---|
669 | data->push_back(cross); |
---|
670 | } |
---|
671 | |
---|
672 | G4IInterpolator* algo1 = interpolationAlgo->Clone(); |
---|
673 | G4IDataSet* elSet = new G4DataSet(i,energies,data,algo1,1.,1.); |
---|
674 | setForMat->AddComponent(elSet); |
---|
675 | } |
---|
676 | |
---|
677 | matCrossSections->push_back(setForMat); |
---|
678 | } |
---|
679 | return matCrossSections; |
---|
680 | } |
---|
681 | |
---|
682 | |
---|
683 | G4double G4PixeCrossSectionHandler::MicroscopicCrossSection(const G4ParticleDefinition* particleDef, |
---|
684 | G4double kineticEnergy, |
---|
685 | G4double Z, |
---|
686 | G4double deltaCut) const |
---|
687 | { |
---|
688 | // Cross section formula is OK for spin=0, 1/2, 1 only ! |
---|
689 | // Calculates the microscopic cross section in Geant4 internal units |
---|
690 | // Formula documented in Geant4 Phys. Ref. Manual |
---|
691 | // ( it is called for elements, AtomicNumber = z ) |
---|
692 | |
---|
693 | G4double cross = 0.; |
---|
694 | |
---|
695 | // Particle mass and energy |
---|
696 | G4double particleMass = particleDef->GetPDGMass(); |
---|
697 | G4double energy = kineticEnergy + particleMass; |
---|
698 | |
---|
699 | // Some kinematics |
---|
700 | G4double gamma = energy / particleMass; |
---|
701 | G4double beta2 = 1. - 1. / (gamma * gamma); |
---|
702 | G4double var = electron_mass_c2 / particleMass; |
---|
703 | G4double tMax = 2. * electron_mass_c2 * (gamma*gamma - 1.) / (1. + 2.*gamma*var + var*var); |
---|
704 | |
---|
705 | // Calculate the total cross section |
---|
706 | |
---|
707 | if ( tMax > deltaCut ) |
---|
708 | { |
---|
709 | var = deltaCut / tMax; |
---|
710 | cross = (1. - var * (1. - beta2 * std::log(var))) / deltaCut; |
---|
711 | |
---|
712 | G4double spin = particleDef->GetPDGSpin() ; |
---|
713 | |
---|
714 | // +term for spin=1/2 particle |
---|
715 | if (spin == 0.5) |
---|
716 | { |
---|
717 | cross += 0.5 * (tMax - deltaCut) / (energy*energy); |
---|
718 | } |
---|
719 | // +term for spin=1 particle |
---|
720 | else if (spin > 0.9 ) |
---|
721 | { |
---|
722 | cross += -std::log(var) / (3.*deltaCut) + (tMax-deltaCut) * |
---|
723 | ((5.+1./var)*0.25 /(energy*energy) - beta2 / (tMax*deltaCut))/3.; |
---|
724 | } |
---|
725 | cross *= twopi_mc2_rcl2 * Z / beta2 ; |
---|
726 | } |
---|
727 | |
---|
728 | //std::cout << "Microscopic = " << cross/barn |
---|
729 | // << ", e = " << kineticEnergy/MeV <<std:: endl; |
---|
730 | |
---|
731 | return cross; |
---|
732 | } |
---|
733 | |
---|