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: G4VCrossSectionHandler.cc,v 1.19 2009/09/25 07:41:34 sincerti Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-beta-cand-01 $ |
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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 | // 1 Aug 2001 MGP Created |
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35 | // 09 Oct 2001 VI Add FindValue with 3 parameters |
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36 | // + NumberOfComponents |
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37 | // 19 Jul 2002 VI Create composite data set for material |
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38 | // 21 Jan 2003 VI Cut per region |
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39 | // |
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40 | // 15 Jul 2009 Nicolas A. Karakatsanis |
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41 | // |
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42 | // - LoadNonLogData method was created to load only the non-logarithmic data from G4EMLOW |
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43 | // dataset. It is essentially performing the data loading operations as in the past. |
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44 | // |
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45 | // - LoadData method was revised in order to calculate the logarithmic values of the data |
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46 | // It retrieves the data values from the G4EMLOW data files but, then, calculates the |
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47 | // respective log values and loads them to seperate data structures. |
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48 | // The EM data sets, initialized this way, contain both non-log and log values. |
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49 | // These initialized data sets can enhance the computing performance of data interpolation |
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50 | // operations |
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51 | // |
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52 | // - BuildMeanFreePathForMaterials method was also revised in order to calculate the |
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53 | // logarithmic values of the loaded data. |
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54 | // It generates the data values and, then, calculates the respective log values which |
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55 | // later load to seperate data structures. |
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56 | // The EM data sets, initialized this way, contain both non-log and log values. |
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57 | // These initialized data sets can enhance the computing performance of data interpolation |
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58 | // operations |
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59 | // |
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60 | // - LoadShellData method was revised in order to eliminate the presence of a potential |
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61 | // memory leak originally identified by Riccardo Capra. |
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62 | // Riccardo Capra Original Comment |
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63 | // Riccardo Capra <capra@ge.infn.it>: PLEASE CHECK THE FOLLOWING PIECE OF CODE |
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64 | // "energies" AND "data" G4DataVector ARE ALLOCATED, FILLED IN AND NEVER USED OR |
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65 | // DELETED. WHATSMORE LOADING FILE OPERATIONS WERE DONE BY G4ShellEMDataSet |
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66 | // EVEN BEFORE THE CHANGES I DID ON THIS FILE. SO THE FOLLOWING CODE IN MY |
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67 | // OPINION SHOULD BE USELESS AND SHOULD PRODUCE A MEMORY LEAK. |
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68 | // |
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69 | // |
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70 | // ------------------------------------------------------------------- |
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71 | |
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72 | #include "G4VCrossSectionHandler.hh" |
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73 | #include "G4VDataSetAlgorithm.hh" |
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74 | #include "G4LogLogInterpolation.hh" |
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75 | #include "G4VEMDataSet.hh" |
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76 | #include "G4EMDataSet.hh" |
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77 | #include "G4CompositeEMDataSet.hh" |
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78 | #include "G4ShellEMDataSet.hh" |
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79 | #include "G4ProductionCutsTable.hh" |
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80 | #include "G4Material.hh" |
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81 | #include "G4Element.hh" |
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82 | #include "Randomize.hh" |
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83 | #include <map> |
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84 | #include <vector> |
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85 | #include <fstream> |
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86 | #include <sstream> |
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87 | |
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88 | |
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89 | G4VCrossSectionHandler::G4VCrossSectionHandler() |
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90 | { |
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91 | crossSections = 0; |
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92 | interpolation = 0; |
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93 | Initialise(); |
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94 | ActiveElements(); |
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95 | } |
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96 | |
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97 | |
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98 | G4VCrossSectionHandler::G4VCrossSectionHandler(G4VDataSetAlgorithm* algorithm, |
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99 | G4double minE, |
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100 | G4double maxE, |
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101 | G4int bins, |
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102 | G4double unitE, |
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103 | G4double unitData, |
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104 | G4int minZ, |
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105 | G4int maxZ) |
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106 | : interpolation(algorithm), eMin(minE), eMax(maxE), nBins(bins), |
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107 | unit1(unitE), unit2(unitData), zMin(minZ), zMax(maxZ) |
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108 | { |
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109 | crossSections = 0; |
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110 | ActiveElements(); |
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111 | } |
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112 | |
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113 | G4VCrossSectionHandler::~G4VCrossSectionHandler() |
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114 | { |
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115 | delete interpolation; |
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116 | interpolation = 0; |
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117 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::iterator pos; |
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118 | |
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119 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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120 | { |
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121 | // The following is a workaround for STL ObjectSpace implementation, |
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122 | // which does not support the standard and does not accept |
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123 | // the syntax pos->second |
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124 | // G4VEMDataSet* dataSet = pos->second; |
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125 | G4VEMDataSet* dataSet = (*pos).second; |
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126 | delete dataSet; |
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127 | } |
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128 | |
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129 | if (crossSections != 0) |
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130 | { |
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131 | size_t n = crossSections->size(); |
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132 | for (size_t i=0; i<n; i++) |
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133 | { |
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134 | delete (*crossSections)[i]; |
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135 | } |
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136 | delete crossSections; |
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137 | crossSections = 0; |
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138 | } |
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139 | } |
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140 | |
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141 | void G4VCrossSectionHandler::Initialise(G4VDataSetAlgorithm* algorithm, |
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142 | G4double minE, G4double maxE, |
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143 | G4int numberOfBins, |
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144 | G4double unitE, G4double unitData, |
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145 | G4int minZ, G4int maxZ) |
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146 | { |
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147 | if (algorithm != 0) |
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148 | { |
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149 | delete interpolation; |
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150 | interpolation = algorithm; |
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151 | } |
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152 | else |
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153 | { |
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154 | interpolation = CreateInterpolation(); |
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155 | } |
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156 | |
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157 | eMin = minE; |
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158 | eMax = maxE; |
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159 | nBins = numberOfBins; |
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160 | unit1 = unitE; |
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161 | unit2 = unitData; |
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162 | zMin = minZ; |
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163 | zMax = maxZ; |
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164 | } |
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165 | |
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166 | void G4VCrossSectionHandler::PrintData() const |
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167 | { |
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168 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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169 | |
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170 | for (pos = dataMap.begin(); pos != dataMap.end(); pos++) |
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171 | { |
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172 | // The following is a workaround for STL ObjectSpace implementation, |
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173 | // which does not support the standard and does not accept |
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174 | // the syntax pos->first or pos->second |
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175 | // G4int z = pos->first; |
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176 | // G4VEMDataSet* dataSet = pos->second; |
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177 | G4int z = (*pos).first; |
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178 | G4VEMDataSet* dataSet = (*pos).second; |
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179 | G4cout << "---- Data set for Z = " |
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180 | << z |
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181 | << G4endl; |
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182 | dataSet->PrintData(); |
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183 | G4cout << "--------------------------------------------------" << G4endl; |
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184 | } |
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185 | } |
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186 | |
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187 | void G4VCrossSectionHandler::LoadData(const G4String& fileName) |
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188 | { |
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189 | size_t nZ = activeZ.size(); |
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190 | for (size_t i=0; i<nZ; i++) |
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191 | { |
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192 | G4int Z = (G4int) activeZ[i]; |
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193 | |
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194 | // Build the complete string identifying the file with the data set |
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195 | |
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196 | char* path = getenv("G4LEDATA"); |
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197 | if (!path) |
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198 | { |
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199 | G4String excep = "G4VCrossSectionHandler - G4LEDATA environment variable not set"; |
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200 | G4Exception(excep); |
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201 | } |
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202 | |
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203 | std::ostringstream ost; |
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204 | ost << path << '/' << fileName << Z << ".dat"; |
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205 | std::ifstream file(ost.str().c_str()); |
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206 | std::filebuf* lsdp = file.rdbuf(); |
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207 | |
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208 | if (! (lsdp->is_open()) ) |
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209 | { |
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210 | G4String excep = "G4VCrossSectionHandler - data file: " + ost.str() + " not found"; |
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211 | G4Exception(excep); |
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212 | } |
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213 | G4double a = 0; |
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214 | G4int k = 0; |
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215 | G4int nColumns = 2; |
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216 | |
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217 | G4DataVector* orig_reg_energies = new G4DataVector; |
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218 | G4DataVector* orig_reg_data = new G4DataVector; |
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219 | G4DataVector* log_reg_energies = new G4DataVector; |
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220 | G4DataVector* log_reg_data = new G4DataVector; |
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221 | |
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222 | do |
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223 | { |
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224 | file >> a; |
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225 | |
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226 | if (a==0.) a=1e-300; |
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227 | |
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228 | // The file is organized into four columns: |
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229 | // 1st column contains the values of energy |
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230 | // 2nd column contains the corresponding data value |
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231 | // The file terminates with the pattern: -1 -1 |
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232 | // -2 -2 |
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233 | // |
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234 | if (a != -1 && a != -2) |
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235 | { |
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236 | if (k%nColumns == 0) |
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237 | { |
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238 | orig_reg_energies->push_back(a*unit1); |
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239 | log_reg_energies->push_back(std::log10(a)+std::log10(unit1)); |
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240 | } |
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241 | else if (k%nColumns == 1) |
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242 | { |
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243 | orig_reg_data->push_back(a*unit2); |
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244 | log_reg_data->push_back(std::log10(a)+std::log10(unit2)); |
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245 | } |
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246 | k++; |
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247 | } |
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248 | } |
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249 | while (a != -2); // End of File |
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250 | |
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251 | file.close(); |
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252 | G4VDataSetAlgorithm* algo = interpolation->Clone(); |
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253 | |
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254 | G4VEMDataSet* dataSet = new G4EMDataSet(Z,orig_reg_energies,orig_reg_data,log_reg_energies,log_reg_data,algo); |
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255 | |
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256 | dataMap[Z] = dataSet; |
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257 | |
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258 | } |
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259 | } |
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260 | |
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261 | |
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262 | void G4VCrossSectionHandler::LoadNonLogData(const G4String& fileName) |
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263 | { |
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264 | size_t nZ = activeZ.size(); |
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265 | for (size_t i=0; i<nZ; i++) |
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266 | { |
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267 | G4int Z = (G4int) activeZ[i]; |
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268 | |
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269 | // Build the complete string identifying the file with the data set |
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270 | |
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271 | char* path = getenv("G4LEDATA"); |
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272 | if (!path) |
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273 | { |
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274 | G4String excep = "G4VCrossSectionHandler - G4LEDATA environment variable not set"; |
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275 | G4Exception(excep); |
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276 | } |
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277 | |
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278 | std::ostringstream ost; |
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279 | ost << path << '/' << fileName << Z << ".dat"; |
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280 | std::ifstream file(ost.str().c_str()); |
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281 | std::filebuf* lsdp = file.rdbuf(); |
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282 | |
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283 | if (! (lsdp->is_open()) ) |
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284 | { |
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285 | G4String excep = "G4VCrossSectionHandler - data file: " + ost.str() + " not found"; |
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286 | G4Exception(excep); |
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287 | } |
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288 | G4double a = 0; |
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289 | G4int k = 0; |
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290 | G4int nColumns = 2; |
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291 | |
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292 | G4DataVector* orig_reg_energies = new G4DataVector; |
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293 | G4DataVector* orig_reg_data = new G4DataVector; |
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294 | |
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295 | do |
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296 | { |
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297 | file >> a; |
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298 | |
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299 | // The file is organized into four columns: |
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300 | // 1st column contains the values of energy |
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301 | // 2nd column contains the corresponding data value |
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302 | // The file terminates with the pattern: -1 -1 |
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303 | // -2 -2 |
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304 | // |
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305 | if (a != -1 && a != -2) |
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306 | { |
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307 | if (k%nColumns == 0) |
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308 | { |
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309 | orig_reg_energies->push_back(a*unit1); |
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310 | } |
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311 | else if (k%nColumns == 1) |
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312 | { |
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313 | orig_reg_data->push_back(a*unit2); |
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314 | } |
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315 | k++; |
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316 | } |
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317 | } |
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318 | while (a != -2); // End of File |
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319 | |
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320 | file.close(); |
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321 | G4VDataSetAlgorithm* algo = interpolation->Clone(); |
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322 | |
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323 | G4VEMDataSet* dataSet = new G4EMDataSet(Z,orig_reg_energies,orig_reg_data,algo); |
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324 | |
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325 | dataMap[Z] = dataSet; |
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326 | |
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327 | } |
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328 | } |
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329 | |
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330 | void G4VCrossSectionHandler::LoadShellData(const G4String& fileName) |
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331 | { |
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332 | size_t nZ = activeZ.size(); |
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333 | for (size_t i=0; i<nZ; i++) |
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334 | { |
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335 | G4int Z = (G4int) activeZ[i]; |
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336 | |
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337 | G4VDataSetAlgorithm* algo = interpolation->Clone(); |
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338 | G4VEMDataSet* dataSet = new G4ShellEMDataSet(Z, algo); |
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339 | |
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340 | dataSet->LoadData(fileName); |
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341 | |
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342 | dataMap[Z] = dataSet; |
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343 | } |
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344 | } |
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345 | |
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346 | |
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347 | |
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348 | |
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349 | void G4VCrossSectionHandler::Clear() |
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350 | { |
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351 | // Reset the map of data sets: remove the data sets from the map |
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352 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::iterator pos; |
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353 | |
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354 | if(! dataMap.empty()) |
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355 | { |
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356 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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357 | { |
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358 | // The following is a workaround for STL ObjectSpace implementation, |
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359 | // which does not support the standard and does not accept |
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360 | // the syntax pos->first or pos->second |
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361 | // G4VEMDataSet* dataSet = pos->second; |
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362 | G4VEMDataSet* dataSet = (*pos).second; |
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363 | delete dataSet; |
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364 | dataSet = 0; |
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365 | G4int i = (*pos).first; |
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366 | dataMap[i] = 0; |
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367 | } |
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368 | dataMap.clear(); |
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369 | } |
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370 | |
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371 | activeZ.clear(); |
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372 | ActiveElements(); |
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373 | } |
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374 | |
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375 | G4double G4VCrossSectionHandler::FindValue(G4int Z, G4double energy) const |
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376 | { |
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377 | G4double value = 0.; |
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378 | |
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379 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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380 | pos = dataMap.find(Z); |
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381 | if (pos!= dataMap.end()) |
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382 | { |
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383 | // The following is a workaround for STL ObjectSpace implementation, |
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384 | // which does not support the standard and does not accept |
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385 | // the syntax pos->first or pos->second |
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386 | // G4VEMDataSet* dataSet = pos->second; |
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387 | G4VEMDataSet* dataSet = (*pos).second; |
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388 | value = dataSet->FindValue(energy); |
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389 | } |
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390 | else |
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391 | { |
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392 | G4cout << "WARNING: G4VCrossSectionHandler::FindValue did not find Z = " |
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393 | << Z << G4endl; |
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394 | } |
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395 | return value; |
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396 | } |
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397 | |
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398 | G4double G4VCrossSectionHandler::FindValue(G4int Z, G4double energy, |
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399 | G4int shellIndex) const |
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400 | { |
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401 | G4double value = 0.; |
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402 | |
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403 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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404 | pos = dataMap.find(Z); |
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405 | if (pos!= dataMap.end()) |
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406 | { |
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407 | // The following is a workaround for STL ObjectSpace implementation, |
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408 | // which does not support the standard and does not accept |
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409 | // the syntax pos->first or pos->second |
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410 | // G4VEMDataSet* dataSet = pos->second; |
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411 | G4VEMDataSet* dataSet = (*pos).second; |
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412 | if (shellIndex >= 0) |
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413 | { |
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414 | G4int nComponents = dataSet->NumberOfComponents(); |
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415 | if(shellIndex < nComponents) |
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416 | // - MGP - Why doesn't it use G4VEMDataSet::FindValue directly? |
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417 | value = dataSet->GetComponent(shellIndex)->FindValue(energy); |
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418 | else |
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419 | { |
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420 | G4cout << "WARNING: G4VCrossSectionHandler::FindValue did not find" |
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421 | << " shellIndex= " << shellIndex |
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422 | << " for Z= " |
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423 | << Z << G4endl; |
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424 | } |
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425 | } else { |
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426 | value = dataSet->FindValue(energy); |
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427 | } |
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428 | } |
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429 | else |
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430 | { |
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431 | G4cout << "WARNING: G4VCrossSectionHandler::FindValue did not find Z = " |
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432 | << Z << G4endl; |
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433 | } |
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434 | return value; |
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435 | } |
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436 | |
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437 | |
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438 | G4double G4VCrossSectionHandler::ValueForMaterial(const G4Material* material, |
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439 | G4double energy) const |
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440 | { |
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441 | G4double value = 0.; |
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442 | |
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443 | const G4ElementVector* elementVector = material->GetElementVector(); |
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444 | const G4double* nAtomsPerVolume = material->GetVecNbOfAtomsPerVolume(); |
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445 | G4int nElements = material->GetNumberOfElements(); |
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446 | |
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447 | for (G4int i=0 ; i<nElements ; i++) |
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448 | { |
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449 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
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450 | G4double elementValue = FindValue(Z,energy); |
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451 | G4double nAtomsVol = nAtomsPerVolume[i]; |
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452 | value += nAtomsVol * elementValue; |
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453 | } |
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454 | |
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455 | return value; |
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456 | } |
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457 | |
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458 | |
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459 | G4VEMDataSet* G4VCrossSectionHandler::BuildMeanFreePathForMaterials(const G4DataVector* energyCuts) |
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460 | { |
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461 | // Builds a CompositeDataSet containing the mean free path for each material |
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462 | // in the material table |
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463 | |
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464 | G4DataVector energyVector; |
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465 | G4double dBin = std::log10(eMax/eMin) / nBins; |
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466 | |
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467 | for (G4int i=0; i<nBins+1; i++) |
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468 | { |
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469 | energyVector.push_back(std::pow(10., std::log10(eMin)+i*dBin)); |
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470 | } |
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471 | |
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472 | // Factory method to build cross sections in derived classes, |
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473 | // related to the type of physics process |
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474 | |
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475 | if (crossSections != 0) |
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476 | { // Reset the list of cross sections |
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477 | std::vector<G4VEMDataSet*>::iterator mat; |
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478 | if (! crossSections->empty()) |
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479 | { |
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480 | for (mat = crossSections->begin(); mat!= crossSections->end(); ++mat) |
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481 | { |
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482 | G4VEMDataSet* set = *mat; |
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483 | delete set; |
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484 | set = 0; |
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485 | } |
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486 | crossSections->clear(); |
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487 | delete crossSections; |
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488 | crossSections = 0; |
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489 | } |
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490 | } |
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491 | |
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492 | crossSections = BuildCrossSectionsForMaterials(energyVector,energyCuts); |
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493 | |
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494 | if (crossSections == 0) |
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495 | G4Exception("G4VCrossSectionHandler::BuildMeanFreePathForMaterials, crossSections = 0"); |
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496 | |
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497 | G4VDataSetAlgorithm* algo = CreateInterpolation(); |
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498 | G4VEMDataSet* materialSet = new G4CompositeEMDataSet(algo); |
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499 | |
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500 | G4DataVector* energies; |
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501 | G4DataVector* data; |
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502 | G4DataVector* log_energies; |
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503 | G4DataVector* log_data; |
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504 | |
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505 | |
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506 | const G4ProductionCutsTable* theCoupleTable= |
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507 | G4ProductionCutsTable::GetProductionCutsTable(); |
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508 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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509 | |
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510 | |
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511 | for (size_t m=0; m<numOfCouples; m++) |
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512 | { |
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513 | energies = new G4DataVector; |
---|
514 | data = new G4DataVector; |
---|
515 | log_energies = new G4DataVector; |
---|
516 | log_data = new G4DataVector; |
---|
517 | for (G4int bin=0; bin<nBins; bin++) |
---|
518 | { |
---|
519 | G4double energy = energyVector[bin]; |
---|
520 | energies->push_back(energy); |
---|
521 | log_energies->push_back(std::log10(energy)); |
---|
522 | G4VEMDataSet* matCrossSet = (*crossSections)[m]; |
---|
523 | G4double materialCrossSection = 0.0; |
---|
524 | G4int nElm = matCrossSet->NumberOfComponents(); |
---|
525 | for(G4int j=0; j<nElm; j++) { |
---|
526 | materialCrossSection += matCrossSet->GetComponent(j)->FindValue(energy); |
---|
527 | } |
---|
528 | |
---|
529 | if (materialCrossSection > 0.) |
---|
530 | { |
---|
531 | data->push_back(1./materialCrossSection); |
---|
532 | log_data->push_back(std::log10(1./materialCrossSection)); |
---|
533 | } |
---|
534 | else |
---|
535 | { |
---|
536 | data->push_back(DBL_MAX); |
---|
537 | log_data->push_back(std::log10(DBL_MAX)); |
---|
538 | } |
---|
539 | } |
---|
540 | G4VDataSetAlgorithm* algo = CreateInterpolation(); |
---|
541 | |
---|
542 | //G4VEMDataSet* dataSet = new G4EMDataSet(m,energies,data,algo,1.,1.); |
---|
543 | |
---|
544 | G4VEMDataSet* dataSet = new G4EMDataSet(m,energies,data,log_energies,log_data,algo,1.,1.); |
---|
545 | |
---|
546 | materialSet->AddComponent(dataSet); |
---|
547 | } |
---|
548 | |
---|
549 | return materialSet; |
---|
550 | } |
---|
551 | |
---|
552 | |
---|
553 | G4int G4VCrossSectionHandler::SelectRandomAtom(const G4MaterialCutsCouple* couple, |
---|
554 | G4double e) const |
---|
555 | { |
---|
556 | // Select randomly an element within the material, according to the weight |
---|
557 | // determined by the cross sections in the data set |
---|
558 | |
---|
559 | const G4Material* material = couple->GetMaterial(); |
---|
560 | G4int nElements = material->GetNumberOfElements(); |
---|
561 | |
---|
562 | // Special case: the material consists of one element |
---|
563 | if (nElements == 1) |
---|
564 | { |
---|
565 | G4int Z = (G4int) material->GetZ(); |
---|
566 | return Z; |
---|
567 | } |
---|
568 | |
---|
569 | // Composite material |
---|
570 | |
---|
571 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
572 | size_t materialIndex = couple->GetIndex(); |
---|
573 | |
---|
574 | G4VEMDataSet* materialSet = (*crossSections)[materialIndex]; |
---|
575 | G4double materialCrossSection0 = 0.0; |
---|
576 | G4DataVector cross; |
---|
577 | cross.clear(); |
---|
578 | for ( G4int i=0; i < nElements; i++ ) |
---|
579 | { |
---|
580 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
---|
581 | materialCrossSection0 += cr; |
---|
582 | cross.push_back(materialCrossSection0); |
---|
583 | } |
---|
584 | |
---|
585 | G4double random = G4UniformRand() * materialCrossSection0; |
---|
586 | |
---|
587 | for (G4int k=0 ; k < nElements ; k++ ) |
---|
588 | { |
---|
589 | if (random <= cross[k]) return (G4int) (*elementVector)[k]->GetZ(); |
---|
590 | } |
---|
591 | // It should never get here |
---|
592 | return 0; |
---|
593 | } |
---|
594 | |
---|
595 | const G4Element* G4VCrossSectionHandler::SelectRandomElement(const G4MaterialCutsCouple* couple, |
---|
596 | G4double e) const |
---|
597 | { |
---|
598 | // Select randomly an element within the material, according to the weight determined |
---|
599 | // by the cross sections in the data set |
---|
600 | |
---|
601 | const G4Material* material = couple->GetMaterial(); |
---|
602 | G4Element* nullElement = 0; |
---|
603 | G4int nElements = material->GetNumberOfElements(); |
---|
604 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
605 | |
---|
606 | // Special case: the material consists of one element |
---|
607 | if (nElements == 1) |
---|
608 | { |
---|
609 | G4Element* element = (*elementVector)[0]; |
---|
610 | return element; |
---|
611 | } |
---|
612 | else |
---|
613 | { |
---|
614 | // Composite material |
---|
615 | |
---|
616 | size_t materialIndex = couple->GetIndex(); |
---|
617 | |
---|
618 | G4VEMDataSet* materialSet = (*crossSections)[materialIndex]; |
---|
619 | G4double materialCrossSection0 = 0.0; |
---|
620 | G4DataVector cross; |
---|
621 | cross.clear(); |
---|
622 | for (G4int i=0; i<nElements; i++) |
---|
623 | { |
---|
624 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
---|
625 | materialCrossSection0 += cr; |
---|
626 | cross.push_back(materialCrossSection0); |
---|
627 | } |
---|
628 | |
---|
629 | G4double random = G4UniformRand() * materialCrossSection0; |
---|
630 | |
---|
631 | for (G4int k=0 ; k < nElements ; k++ ) |
---|
632 | { |
---|
633 | if (random <= cross[k]) return (*elementVector)[k]; |
---|
634 | } |
---|
635 | // It should never end up here |
---|
636 | G4cout << "G4VCrossSectionHandler::SelectRandomElement - no element found" << G4endl; |
---|
637 | return nullElement; |
---|
638 | } |
---|
639 | } |
---|
640 | |
---|
641 | G4int G4VCrossSectionHandler::SelectRandomShell(G4int Z, G4double e) const |
---|
642 | { |
---|
643 | // Select randomly a shell, according to the weight determined by the cross sections |
---|
644 | // in the data set |
---|
645 | |
---|
646 | // Note for later improvement: it would be useful to add a cache mechanism for already |
---|
647 | // used shells to improve performance |
---|
648 | |
---|
649 | G4int shell = 0; |
---|
650 | |
---|
651 | G4double totCrossSection = FindValue(Z,e); |
---|
652 | G4double random = G4UniformRand() * totCrossSection; |
---|
653 | G4double partialSum = 0.; |
---|
654 | |
---|
655 | G4VEMDataSet* dataSet = 0; |
---|
656 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
---|
657 | pos = dataMap.find(Z); |
---|
658 | // The following is a workaround for STL ObjectSpace implementation, |
---|
659 | // which does not support the standard and does not accept |
---|
660 | // the syntax pos->first or pos->second |
---|
661 | // if (pos != dataMap.end()) dataSet = pos->second; |
---|
662 | if (pos != dataMap.end()) dataSet = (*pos).second; |
---|
663 | |
---|
664 | size_t nShells = dataSet->NumberOfComponents(); |
---|
665 | for (size_t i=0; i<nShells; i++) |
---|
666 | { |
---|
667 | const G4VEMDataSet* shellDataSet = dataSet->GetComponent(i); |
---|
668 | if (shellDataSet != 0) |
---|
669 | { |
---|
670 | G4double value = shellDataSet->FindValue(e); |
---|
671 | partialSum += value; |
---|
672 | if (random <= partialSum) return i; |
---|
673 | } |
---|
674 | } |
---|
675 | // It should never get here |
---|
676 | return shell; |
---|
677 | } |
---|
678 | |
---|
679 | void G4VCrossSectionHandler::ActiveElements() |
---|
680 | { |
---|
681 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
---|
682 | if (materialTable == 0) |
---|
683 | G4Exception("G4VCrossSectionHandler::ActiveElements - no MaterialTable found)"); |
---|
684 | |
---|
685 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
---|
686 | |
---|
687 | for (G4int m=0; m<nMaterials; m++) |
---|
688 | { |
---|
689 | const G4Material* material= (*materialTable)[m]; |
---|
690 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
691 | const G4int nElements = material->GetNumberOfElements(); |
---|
692 | |
---|
693 | for (G4int iEl=0; iEl<nElements; iEl++) |
---|
694 | { |
---|
695 | G4Element* element = (*elementVector)[iEl]; |
---|
696 | G4double Z = element->GetZ(); |
---|
697 | if (!(activeZ.contains(Z)) && Z >= zMin && Z <= zMax) |
---|
698 | { |
---|
699 | activeZ.push_back(Z); |
---|
700 | } |
---|
701 | } |
---|
702 | } |
---|
703 | } |
---|
704 | |
---|
705 | G4VDataSetAlgorithm* G4VCrossSectionHandler::CreateInterpolation() |
---|
706 | { |
---|
707 | G4VDataSetAlgorithm* algorithm = new G4LogLogInterpolation; |
---|
708 | return algorithm; |
---|
709 | } |
---|
710 | |
---|
711 | G4int G4VCrossSectionHandler::NumberOfComponents(G4int Z) const |
---|
712 | { |
---|
713 | G4int n = 0; |
---|
714 | |
---|
715 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
---|
716 | pos = dataMap.find(Z); |
---|
717 | if (pos!= dataMap.end()) |
---|
718 | { |
---|
719 | G4VEMDataSet* dataSet = (*pos).second; |
---|
720 | n = dataSet->NumberOfComponents(); |
---|
721 | } |
---|
722 | else |
---|
723 | { |
---|
724 | G4cout << "WARNING: G4VCrossSectionHandler::NumberOfComponents did not " |
---|
725 | << "find Z = " |
---|
726 | << Z << G4endl; |
---|
727 | } |
---|
728 | return n; |
---|
729 | } |
---|
730 | |
---|
731 | |
---|