[819] | 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 1.17 2006/06/29 19:41:42 gunter Exp $ |
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| 28 | // GEANT4 tag $Name: $ |
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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 | // ------------------------------------------------------------------- |
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| 41 | |
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| 42 | #include "G4VCrossSectionHandler.hh" |
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| 43 | #include "G4VDataSetAlgorithm.hh" |
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| 44 | #include "G4LogLogInterpolation.hh" |
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| 45 | #include "G4VEMDataSet.hh" |
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| 46 | #include "G4EMDataSet.hh" |
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| 47 | #include "G4CompositeEMDataSet.hh" |
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| 48 | #include "G4ShellEMDataSet.hh" |
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| 49 | #include "G4ProductionCutsTable.hh" |
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| 50 | #include "G4Material.hh" |
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| 51 | #include "G4Element.hh" |
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| 52 | #include "Randomize.hh" |
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| 53 | #include <map> |
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| 54 | #include <vector> |
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| 55 | #include <fstream> |
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| 56 | #include <sstream> |
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| 57 | |
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| 58 | |
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| 59 | G4VCrossSectionHandler::G4VCrossSectionHandler() |
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| 60 | { |
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| 61 | crossSections = 0; |
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| 62 | interpolation = 0; |
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| 63 | Initialise(); |
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| 64 | ActiveElements(); |
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| 65 | } |
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| 66 | |
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| 67 | |
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| 68 | G4VCrossSectionHandler::G4VCrossSectionHandler(G4VDataSetAlgorithm* algorithm, |
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| 69 | G4double minE, |
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| 70 | G4double maxE, |
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| 71 | G4int bins, |
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| 72 | G4double unitE, |
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| 73 | G4double unitData, |
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| 74 | G4int minZ, |
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| 75 | G4int maxZ) |
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| 76 | : interpolation(algorithm), eMin(minE), eMax(maxE), nBins(bins), |
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| 77 | unit1(unitE), unit2(unitData), zMin(minZ), zMax(maxZ) |
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| 78 | { |
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| 79 | crossSections = 0; |
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| 80 | ActiveElements(); |
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| 81 | } |
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| 82 | |
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| 83 | G4VCrossSectionHandler::~G4VCrossSectionHandler() |
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| 84 | { |
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| 85 | delete interpolation; |
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| 86 | interpolation = 0; |
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| 87 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::iterator pos; |
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| 88 | |
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| 89 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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| 90 | { |
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| 91 | // The following is a workaround for STL ObjectSpace implementation, |
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| 92 | // which does not support the standard and does not accept |
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| 93 | // the syntax pos->second |
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| 94 | // G4VEMDataSet* dataSet = pos->second; |
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| 95 | G4VEMDataSet* dataSet = (*pos).second; |
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| 96 | delete dataSet; |
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| 97 | } |
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| 98 | |
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| 99 | if (crossSections != 0) |
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| 100 | { |
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| 101 | size_t n = crossSections->size(); |
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| 102 | for (size_t i=0; i<n; i++) |
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| 103 | { |
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| 104 | delete (*crossSections)[i]; |
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| 105 | } |
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| 106 | delete crossSections; |
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| 107 | crossSections = 0; |
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| 108 | } |
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| 109 | } |
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| 110 | |
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| 111 | void G4VCrossSectionHandler::Initialise(G4VDataSetAlgorithm* algorithm, |
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| 112 | G4double minE, G4double maxE, |
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| 113 | G4int numberOfBins, |
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| 114 | G4double unitE, G4double unitData, |
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| 115 | G4int minZ, G4int maxZ) |
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| 116 | { |
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| 117 | if (algorithm != 0) |
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| 118 | { |
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| 119 | delete interpolation; |
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| 120 | interpolation = algorithm; |
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| 121 | } |
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| 122 | else |
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| 123 | { |
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| 124 | interpolation = CreateInterpolation(); |
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| 125 | } |
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| 126 | |
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| 127 | eMin = minE; |
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| 128 | eMax = maxE; |
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| 129 | nBins = numberOfBins; |
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| 130 | unit1 = unitE; |
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| 131 | unit2 = unitData; |
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| 132 | zMin = minZ; |
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| 133 | zMax = maxZ; |
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| 134 | } |
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| 135 | |
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| 136 | void G4VCrossSectionHandler::PrintData() const |
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| 137 | { |
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| 138 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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| 139 | |
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| 140 | for (pos = dataMap.begin(); pos != dataMap.end(); pos++) |
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| 141 | { |
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| 142 | // The following is a workaround for STL ObjectSpace implementation, |
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| 143 | // which does not support the standard and does not accept |
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| 144 | // the syntax pos->first or pos->second |
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| 145 | // G4int z = pos->first; |
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| 146 | // G4VEMDataSet* dataSet = pos->second; |
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| 147 | G4int z = (*pos).first; |
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| 148 | G4VEMDataSet* dataSet = (*pos).second; |
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| 149 | G4cout << "---- Data set for Z = " |
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| 150 | << z |
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| 151 | << G4endl; |
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| 152 | dataSet->PrintData(); |
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| 153 | G4cout << "--------------------------------------------------" << G4endl; |
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| 154 | } |
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| 155 | } |
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| 156 | |
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| 157 | void G4VCrossSectionHandler::LoadData(const G4String& fileName) |
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| 158 | { |
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| 159 | size_t nZ = activeZ.size(); |
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| 160 | for (size_t i=0; i<nZ; i++) |
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| 161 | { |
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| 162 | G4int Z = (G4int) activeZ[i]; |
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| 163 | |
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| 164 | // Build the complete string identifying the file with the data set |
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| 165 | |
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| 166 | char* path = getenv("G4LEDATA"); |
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| 167 | if (!path) |
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| 168 | { |
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| 169 | G4String excep = "G4VCrossSectionHandler - G4LEDATA environment variable not set"; |
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| 170 | G4Exception(excep); |
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| 171 | } |
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| 172 | |
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| 173 | std::ostringstream ost; |
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| 174 | ost << path << '/' << fileName << Z << ".dat"; |
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| 175 | std::ifstream file(ost.str().c_str()); |
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| 176 | std::filebuf* lsdp = file.rdbuf(); |
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| 177 | |
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| 178 | if (! (lsdp->is_open()) ) |
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| 179 | { |
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| 180 | G4String excep = "G4VCrossSectionHandler - data file: " + ost.str() + " not found"; |
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| 181 | G4Exception(excep); |
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| 182 | } |
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| 183 | G4double a = 0; |
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| 184 | G4int k = 1; |
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| 185 | G4DataVector* energies = new G4DataVector; |
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| 186 | G4DataVector* data = new G4DataVector; |
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| 187 | do |
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| 188 | { |
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| 189 | file >> a; |
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| 190 | G4int nColumns = 2; |
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| 191 | // The file is organized into two columns: |
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| 192 | // 1st column is the energy |
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| 193 | // 2nd column is the corresponding value |
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| 194 | // The file terminates with the pattern: -1 -1 |
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| 195 | // -2 -2 |
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| 196 | if (a == -1 || a == -2) |
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| 197 | { |
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| 198 | } |
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| 199 | else |
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| 200 | { |
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| 201 | if (k%nColumns != 0) |
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| 202 | { |
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| 203 | G4double e = a * unit1; |
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| 204 | energies->push_back(e); |
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| 205 | k++; |
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| 206 | } |
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| 207 | else if (k%nColumns == 0) |
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| 208 | { |
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| 209 | G4double value = a * unit2; |
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| 210 | data->push_back(value); |
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| 211 | k = 1; |
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| 212 | } |
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| 213 | } |
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| 214 | } while (a != -2); // end of file |
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| 215 | |
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| 216 | file.close(); |
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| 217 | G4VDataSetAlgorithm* algo = interpolation->Clone(); |
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| 218 | G4VEMDataSet* dataSet = new G4EMDataSet(Z,energies,data,algo); |
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| 219 | dataMap[Z] = dataSet; |
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| 220 | } |
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| 221 | } |
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| 222 | |
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| 223 | void G4VCrossSectionHandler::LoadShellData(const G4String& fileName) |
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| 224 | { |
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| 225 | size_t nZ = activeZ.size(); |
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| 226 | for (size_t i=0; i<nZ; i++) |
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| 227 | { |
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| 228 | G4int Z = (G4int) activeZ[i]; |
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| 229 | |
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| 230 | // Riccardo Capra <capra@ge.infn.it>: PLEASE CHECK THE FOLLOWING PIECE OF CODE |
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| 231 | // "energies" AND "data" G4DataVector ARE ALLOCATED, FILLED IN AND NEVER USED OR |
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| 232 | // DELETED. WHATSMORE LOADING FILE OPERATIONS WERE DONE BY G4ShellEMDataSet |
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| 233 | // EVEN BEFORE THE CHANGES I DID ON THIS FILE. SO THE FOLLOWING CODE IN MY |
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| 234 | // OPINION SHOULD BE USELESS AND SHOULD PRODUCE A MEMORY LEAK. |
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| 235 | |
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| 236 | // Build the complete string identifying the file with the data set |
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| 237 | |
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| 238 | char* path = getenv("G4LEDATA"); |
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| 239 | if (!path) |
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| 240 | { |
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| 241 | G4String excep = "G4VCrossSectionHandler - G4LEDATA environment variable not set"; |
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| 242 | G4Exception(excep); |
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| 243 | } |
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| 244 | |
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| 245 | std::ostringstream ost; |
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| 246 | |
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| 247 | ost << path << '/' << fileName << Z << ".dat"; |
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| 248 | |
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| 249 | std::ifstream file(ost.str().c_str()); |
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| 250 | std::filebuf* lsdp = file.rdbuf(); |
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| 251 | |
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| 252 | if (! (lsdp->is_open()) ) |
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| 253 | { |
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| 254 | G4String excep = "G4VCrossSectionHandler - data file: " + ost.str() + " not found"; |
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| 255 | G4Exception(excep); |
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| 256 | } |
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| 257 | G4double a = 0; |
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| 258 | G4int k = 1; |
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| 259 | G4DataVector* energies = new G4DataVector; |
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| 260 | G4DataVector* data = new G4DataVector; |
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| 261 | do |
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| 262 | { |
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| 263 | file >> a; |
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| 264 | G4int nColumns = 2; |
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| 265 | // The file is organized into two columns: |
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| 266 | // 1st column is the energy |
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| 267 | // 2nd column is the corresponding value |
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| 268 | // The file terminates with the pattern: -1 -1 |
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| 269 | // -2 -2 |
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| 270 | if (a == -1 || a == -2) |
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| 271 | { |
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| 272 | } |
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| 273 | else |
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| 274 | { |
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| 275 | if (k%nColumns != 0) |
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| 276 | { |
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| 277 | G4double e = a * unit1; |
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| 278 | energies->push_back(e); |
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| 279 | k++; |
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| 280 | } |
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| 281 | else if (k%nColumns == 0) |
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| 282 | { |
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| 283 | G4double value = a * unit2; |
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| 284 | data->push_back(value); |
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| 285 | k = 1; |
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| 286 | } |
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| 287 | } |
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| 288 | } while (a != -2); // end of file |
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| 289 | |
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| 290 | file.close(); |
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| 291 | |
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| 292 | // Riccardo Capra <capra@ge.infn.it>: END OF CODE THAT IN MY OPINION SHOULD BE |
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| 293 | // REMOVED. |
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| 294 | |
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| 295 | G4VDataSetAlgorithm* algo = interpolation->Clone(); |
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| 296 | G4VEMDataSet* dataSet = new G4ShellEMDataSet(Z, algo); |
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| 297 | dataSet->LoadData(fileName); |
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| 298 | dataMap[Z] = dataSet; |
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| 299 | } |
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| 300 | } |
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| 301 | |
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| 302 | void G4VCrossSectionHandler::Clear() |
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| 303 | { |
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| 304 | // Reset the map of data sets: remove the data sets from the map |
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| 305 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::iterator pos; |
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| 306 | |
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| 307 | if(! dataMap.empty()) |
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| 308 | { |
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| 309 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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| 310 | { |
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| 311 | // The following is a workaround for STL ObjectSpace implementation, |
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| 312 | // which does not support the standard and does not accept |
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| 313 | // the syntax pos->first or pos->second |
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| 314 | // G4VEMDataSet* dataSet = pos->second; |
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| 315 | G4VEMDataSet* dataSet = (*pos).second; |
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| 316 | delete dataSet; |
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| 317 | dataSet = 0; |
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| 318 | G4int i = (*pos).first; |
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| 319 | dataMap[i] = 0; |
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| 320 | } |
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| 321 | dataMap.clear(); |
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| 322 | } |
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| 323 | |
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| 324 | activeZ.clear(); |
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| 325 | ActiveElements(); |
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| 326 | } |
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| 327 | |
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| 328 | G4double G4VCrossSectionHandler::FindValue(G4int Z, G4double energy) const |
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| 329 | { |
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| 330 | G4double value = 0.; |
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| 331 | |
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| 332 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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| 333 | pos = dataMap.find(Z); |
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| 334 | if (pos!= dataMap.end()) |
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| 335 | { |
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| 336 | // The following is a workaround for STL ObjectSpace implementation, |
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| 337 | // which does not support the standard and does not accept |
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| 338 | // the syntax pos->first or pos->second |
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| 339 | // G4VEMDataSet* dataSet = pos->second; |
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| 340 | G4VEMDataSet* dataSet = (*pos).second; |
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| 341 | value = dataSet->FindValue(energy); |
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| 342 | } |
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| 343 | else |
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| 344 | { |
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| 345 | G4cout << "WARNING: G4VCrossSectionHandler::FindValue did not find Z = " |
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| 346 | << Z << G4endl; |
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| 347 | } |
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| 348 | return value; |
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| 349 | } |
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| 350 | |
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| 351 | G4double G4VCrossSectionHandler::FindValue(G4int Z, G4double energy, |
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| 352 | G4int shellIndex) const |
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| 353 | { |
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| 354 | G4double value = 0.; |
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| 355 | |
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| 356 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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| 357 | pos = dataMap.find(Z); |
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| 358 | if (pos!= dataMap.end()) |
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| 359 | { |
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| 360 | // The following is a workaround for STL ObjectSpace implementation, |
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| 361 | // which does not support the standard and does not accept |
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| 362 | // the syntax pos->first or pos->second |
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| 363 | // G4VEMDataSet* dataSet = pos->second; |
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| 364 | G4VEMDataSet* dataSet = (*pos).second; |
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| 365 | if (shellIndex >= 0) |
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| 366 | { |
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| 367 | G4int nComponents = dataSet->NumberOfComponents(); |
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| 368 | if(shellIndex < nComponents) |
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| 369 | // - MGP - Why doesn't it use G4VEMDataSet::FindValue directly? |
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| 370 | value = dataSet->GetComponent(shellIndex)->FindValue(energy); |
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| 371 | else |
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| 372 | { |
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| 373 | G4cout << "WARNING: G4VCrossSectionHandler::FindValue did not find" |
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| 374 | << " shellIndex= " << shellIndex |
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| 375 | << " for Z= " |
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| 376 | << Z << G4endl; |
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| 377 | } |
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| 378 | } else { |
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| 379 | value = dataSet->FindValue(energy); |
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| 380 | } |
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| 381 | } |
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| 382 | else |
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| 383 | { |
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| 384 | G4cout << "WARNING: G4VCrossSectionHandler::FindValue did not find Z = " |
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| 385 | << Z << G4endl; |
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| 386 | } |
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| 387 | return value; |
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| 388 | } |
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| 389 | |
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| 390 | |
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| 391 | G4double G4VCrossSectionHandler::ValueForMaterial(const G4Material* material, |
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| 392 | G4double energy) const |
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| 393 | { |
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| 394 | G4double value = 0.; |
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| 395 | |
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| 396 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 397 | const G4double* nAtomsPerVolume = material->GetVecNbOfAtomsPerVolume(); |
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| 398 | G4int nElements = material->GetNumberOfElements(); |
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| 399 | |
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| 400 | for (G4int i=0 ; i<nElements ; i++) |
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| 401 | { |
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| 402 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
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| 403 | G4double elementValue = FindValue(Z,energy); |
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| 404 | G4double nAtomsVol = nAtomsPerVolume[i]; |
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| 405 | value += nAtomsVol * elementValue; |
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| 406 | } |
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| 407 | |
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| 408 | return value; |
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| 409 | } |
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| 410 | |
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| 411 | |
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| 412 | G4VEMDataSet* G4VCrossSectionHandler::BuildMeanFreePathForMaterials(const G4DataVector* energyCuts) |
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| 413 | { |
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| 414 | // Builds a CompositeDataSet containing the mean free path for each material |
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| 415 | // in the material table |
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| 416 | |
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| 417 | G4DataVector energyVector; |
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| 418 | G4double dBin = std::log10(eMax/eMin) / nBins; |
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| 419 | |
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| 420 | for (G4int i=0; i<nBins+1; i++) |
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| 421 | { |
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| 422 | energyVector.push_back(std::pow(10., std::log10(eMin)+i*dBin)); |
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| 423 | } |
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| 424 | |
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| 425 | // Factory method to build cross sections in derived classes, |
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| 426 | // related to the type of physics process |
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| 427 | |
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| 428 | if (crossSections != 0) |
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| 429 | { // Reset the list of cross sections |
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| 430 | std::vector<G4VEMDataSet*>::iterator mat; |
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| 431 | if (! crossSections->empty()) |
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| 432 | { |
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| 433 | for (mat = crossSections->begin(); mat!= crossSections->end(); ++mat) |
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| 434 | { |
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| 435 | G4VEMDataSet* set = *mat; |
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| 436 | delete set; |
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| 437 | set = 0; |
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| 438 | } |
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| 439 | crossSections->clear(); |
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| 440 | delete crossSections; |
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| 441 | crossSections = 0; |
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| 442 | } |
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| 443 | } |
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| 444 | |
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| 445 | crossSections = BuildCrossSectionsForMaterials(energyVector,energyCuts); |
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| 446 | |
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| 447 | if (crossSections == 0) |
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| 448 | G4Exception("G4VCrossSectionHandler::BuildMeanFreePathForMaterials, crossSections = 0"); |
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| 449 | |
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| 450 | G4VDataSetAlgorithm* algo = CreateInterpolation(); |
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| 451 | G4VEMDataSet* materialSet = new G4CompositeEMDataSet(algo); |
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| 452 | |
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| 453 | G4DataVector* energies; |
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| 454 | G4DataVector* data; |
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| 455 | |
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| 456 | const G4ProductionCutsTable* theCoupleTable= |
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| 457 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 458 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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| 459 | |
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| 460 | |
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| 461 | for (size_t m=0; m<numOfCouples; m++) |
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| 462 | { |
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| 463 | energies = new G4DataVector; |
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| 464 | data = new G4DataVector; |
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| 465 | for (G4int bin=0; bin<nBins; bin++) |
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| 466 | { |
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| 467 | G4double energy = energyVector[bin]; |
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| 468 | energies->push_back(energy); |
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| 469 | G4VEMDataSet* matCrossSet = (*crossSections)[m]; |
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| 470 | G4double materialCrossSection = 0.0; |
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| 471 | G4int nElm = matCrossSet->NumberOfComponents(); |
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| 472 | for(G4int j=0; j<nElm; j++) { |
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| 473 | materialCrossSection += matCrossSet->GetComponent(j)->FindValue(energy); |
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| 474 | } |
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| 475 | |
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| 476 | if (materialCrossSection > 0.) |
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| 477 | { |
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| 478 | data->push_back(1./materialCrossSection); |
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| 479 | } |
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| 480 | else |
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| 481 | { |
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| 482 | data->push_back(DBL_MAX); |
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| 483 | } |
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| 484 | } |
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| 485 | G4VDataSetAlgorithm* algo = CreateInterpolation(); |
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| 486 | G4VEMDataSet* dataSet = new G4EMDataSet(m,energies,data,algo,1.,1.); |
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| 487 | materialSet->AddComponent(dataSet); |
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| 488 | } |
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| 489 | |
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| 490 | return materialSet; |
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| 491 | } |
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| 492 | |
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| 493 | G4int G4VCrossSectionHandler::SelectRandomAtom(const G4MaterialCutsCouple* couple, |
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| 494 | G4double e) const |
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| 495 | { |
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| 496 | // Select randomly an element within the material, according to the weight |
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| 497 | // determined by the cross sections in the data set |
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| 498 | |
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| 499 | const G4Material* material = couple->GetMaterial(); |
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| 500 | G4int nElements = material->GetNumberOfElements(); |
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| 501 | |
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| 502 | // Special case: the material consists of one element |
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| 503 | if (nElements == 1) |
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| 504 | { |
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| 505 | G4int Z = (G4int) material->GetZ(); |
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| 506 | return Z; |
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| 507 | } |
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| 508 | |
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| 509 | // Composite material |
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| 510 | |
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| 511 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 512 | size_t materialIndex = couple->GetIndex(); |
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| 513 | |
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| 514 | G4VEMDataSet* materialSet = (*crossSections)[materialIndex]; |
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| 515 | G4double materialCrossSection0 = 0.0; |
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| 516 | G4DataVector cross; |
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| 517 | cross.clear(); |
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| 518 | for ( G4int i=0; i < nElements; i++ ) |
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| 519 | { |
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| 520 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
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| 521 | materialCrossSection0 += cr; |
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| 522 | cross.push_back(materialCrossSection0); |
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| 523 | } |
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| 524 | |
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| 525 | G4double random = G4UniformRand() * materialCrossSection0; |
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| 526 | |
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| 527 | for (G4int k=0 ; k < nElements ; k++ ) |
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| 528 | { |
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| 529 | if (random <= cross[k]) return (G4int) (*elementVector)[k]->GetZ(); |
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| 530 | } |
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| 531 | // It should never get here |
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| 532 | return 0; |
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| 533 | } |
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| 534 | |
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| 535 | const G4Element* G4VCrossSectionHandler::SelectRandomElement(const G4MaterialCutsCouple* couple, |
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| 536 | G4double e) const |
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| 537 | { |
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| 538 | // Select randomly an element within the material, according to the weight determined |
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| 539 | // by the cross sections in the data set |
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| 540 | |
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| 541 | const G4Material* material = couple->GetMaterial(); |
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| 542 | G4Element* nullElement = 0; |
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| 543 | G4int nElements = material->GetNumberOfElements(); |
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| 544 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 545 | |
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| 546 | // Special case: the material consists of one element |
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| 547 | if (nElements == 1) |
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| 548 | { |
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| 549 | G4Element* element = (*elementVector)[0]; |
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| 550 | return element; |
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| 551 | } |
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| 552 | else |
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| 553 | { |
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| 554 | // Composite material |
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| 555 | |
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| 556 | size_t materialIndex = couple->GetIndex(); |
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| 557 | |
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| 558 | G4VEMDataSet* materialSet = (*crossSections)[materialIndex]; |
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| 559 | G4double materialCrossSection0 = 0.0; |
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| 560 | G4DataVector cross; |
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| 561 | cross.clear(); |
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| 562 | for (G4int i=0; i<nElements; i++) |
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| 563 | { |
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| 564 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
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| 565 | materialCrossSection0 += cr; |
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| 566 | cross.push_back(materialCrossSection0); |
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| 567 | } |
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| 568 | |
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| 569 | G4double random = G4UniformRand() * materialCrossSection0; |
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| 570 | |
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| 571 | for (G4int k=0 ; k < nElements ; k++ ) |
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| 572 | { |
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| 573 | if (random <= cross[k]) return (*elementVector)[k]; |
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| 574 | } |
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| 575 | // It should never end up here |
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| 576 | G4cout << "G4VCrossSectionHandler::SelectRandomElement - no element found" << G4endl; |
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| 577 | return nullElement; |
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| 578 | } |
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| 579 | } |
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| 580 | |
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| 581 | G4int G4VCrossSectionHandler::SelectRandomShell(G4int Z, G4double e) const |
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| 582 | { |
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| 583 | // Select randomly a shell, according to the weight determined by the cross sections |
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| 584 | // in the data set |
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| 585 | |
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| 586 | // Note for later improvement: it would be useful to add a cache mechanism for already |
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| 587 | // used shells to improve performance |
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| 588 | |
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| 589 | G4int shell = 0; |
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| 590 | |
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| 591 | G4double totCrossSection = FindValue(Z,e); |
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| 592 | G4double random = G4UniformRand() * totCrossSection; |
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| 593 | G4double partialSum = 0.; |
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| 594 | |
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| 595 | G4VEMDataSet* dataSet = 0; |
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| 596 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
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| 597 | pos = dataMap.find(Z); |
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| 598 | // The following is a workaround for STL ObjectSpace implementation, |
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| 599 | // which does not support the standard and does not accept |
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| 600 | // the syntax pos->first or pos->second |
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| 601 | // if (pos != dataMap.end()) dataSet = pos->second; |
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| 602 | if (pos != dataMap.end()) dataSet = (*pos).second; |
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| 603 | |
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| 604 | size_t nShells = dataSet->NumberOfComponents(); |
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| 605 | for (size_t i=0; i<nShells; i++) |
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| 606 | { |
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| 607 | const G4VEMDataSet* shellDataSet = dataSet->GetComponent(i); |
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| 608 | if (shellDataSet != 0) |
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| 609 | { |
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| 610 | G4double value = shellDataSet->FindValue(e); |
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| 611 | partialSum += value; |
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| 612 | if (random <= partialSum) return i; |
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| 613 | } |
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| 614 | } |
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| 615 | // It should never get here |
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| 616 | return shell; |
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| 617 | } |
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| 618 | |
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| 619 | void G4VCrossSectionHandler::ActiveElements() |
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| 620 | { |
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| 621 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
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| 622 | if (materialTable == 0) |
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| 623 | G4Exception("G4VCrossSectionHandler::ActiveElements - no MaterialTable found)"); |
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| 624 | |
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| 625 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
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| 626 | |
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| 627 | for (G4int m=0; m<nMaterials; m++) |
---|
| 628 | { |
---|
| 629 | const G4Material* material= (*materialTable)[m]; |
---|
| 630 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
| 631 | const G4int nElements = material->GetNumberOfElements(); |
---|
| 632 | |
---|
| 633 | for (G4int iEl=0; iEl<nElements; iEl++) |
---|
| 634 | { |
---|
| 635 | G4Element* element = (*elementVector)[iEl]; |
---|
| 636 | G4double Z = element->GetZ(); |
---|
| 637 | if (!(activeZ.contains(Z)) && Z >= zMin && Z <= zMax) |
---|
| 638 | { |
---|
| 639 | activeZ.push_back(Z); |
---|
| 640 | } |
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| 641 | } |
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| 642 | } |
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| 643 | } |
---|
| 644 | |
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| 645 | G4VDataSetAlgorithm* G4VCrossSectionHandler::CreateInterpolation() |
---|
| 646 | { |
---|
| 647 | G4VDataSetAlgorithm* algorithm = new G4LogLogInterpolation; |
---|
| 648 | return algorithm; |
---|
| 649 | } |
---|
| 650 | |
---|
| 651 | G4int G4VCrossSectionHandler::NumberOfComponents(G4int Z) const |
---|
| 652 | { |
---|
| 653 | G4int n = 0; |
---|
| 654 | |
---|
| 655 | std::map<G4int,G4VEMDataSet*,std::less<G4int> >::const_iterator pos; |
---|
| 656 | pos = dataMap.find(Z); |
---|
| 657 | if (pos!= dataMap.end()) |
---|
| 658 | { |
---|
| 659 | G4VEMDataSet* dataSet = (*pos).second; |
---|
| 660 | n = dataSet->NumberOfComponents(); |
---|
| 661 | } |
---|
| 662 | else |
---|
| 663 | { |
---|
| 664 | G4cout << "WARNING: G4VCrossSectionHandler::NumberOfComponents did not " |
---|
| 665 | << "find Z = " |
---|
| 666 | << Z << G4endl; |
---|
| 667 | } |
---|
| 668 | return n; |
---|
| 669 | } |
---|
| 670 | |
---|
| 671 | |
---|