[1350] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // $Id: G4PixeCrossSectionHandler.cc,v 1.2 2010/11/19 17:16:21 pia Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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| 29 | // |
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| 30 | // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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| 31 | // |
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| 32 | // History: |
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| 33 | // ----------- |
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| 34 | // 16 Jun 2008 MGP Created; Cross section manager for hadron impact ionization |
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| 35 | // Documented in: |
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| 36 | // M.G. Pia et al., PIXE Simulation With Geant4, |
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| 37 | // IEEE Trans. Nucl. Sci., vol. 56, no. 6, pp. 3614-3649, Dec. 2009 |
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| 38 | // |
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| 39 | // ------------------------------------------------------------------- |
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| 40 | |
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| 41 | #include "G4PixeCrossSectionHandler.hh" |
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| 42 | #include "G4IInterpolator.hh" |
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| 43 | #include "G4LogLogInterpolator.hh" |
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| 44 | #include "G4IDataSet.hh" |
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| 45 | #include "G4DataSet.hh" |
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| 46 | #include "G4CompositeDataSet.hh" |
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| 47 | #include "G4PixeShellDataSet.hh" |
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| 48 | #include "G4ProductionCutsTable.hh" |
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| 49 | #include "G4Material.hh" |
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| 50 | #include "G4Element.hh" |
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| 51 | #include "Randomize.hh" |
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| 52 | #include "G4SystemOfUnits.hh" |
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| 53 | #include "G4ParticleDefinition.hh" |
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| 54 | |
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| 55 | #include <map> |
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| 56 | #include <vector> |
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| 57 | #include <fstream> |
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| 58 | #include <sstream> |
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| 59 | |
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| 60 | |
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| 61 | G4PixeCrossSectionHandler::G4PixeCrossSectionHandler() |
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| 62 | { |
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| 63 | crossSections = 0; |
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| 64 | interpolation = 0; |
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| 65 | // Initialise with default values |
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| 66 | Initialise(0,"","","",1.*keV,0.1*GeV,200,MeV,barn,6,92); |
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| 67 | ActiveElements(); |
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| 68 | } |
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| 69 | |
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| 70 | |
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| 71 | G4PixeCrossSectionHandler::G4PixeCrossSectionHandler(G4IInterpolator* algorithm, |
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| 72 | const G4String& modelK, |
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| 73 | const G4String& modelL, |
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| 74 | const G4String& modelM, |
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| 75 | G4double minE, |
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| 76 | G4double maxE, |
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| 77 | G4int bins, |
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| 78 | G4double unitE, |
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| 79 | G4double unitData, |
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| 80 | G4int minZ, |
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| 81 | G4int maxZ) |
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| 82 | : interpolation(algorithm), eMin(minE), eMax(maxE), nBins(bins), |
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| 83 | unit1(unitE), unit2(unitData), zMin(minZ), zMax(maxZ) |
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| 84 | { |
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| 85 | crossSections = 0; |
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| 86 | |
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| 87 | crossModel.push_back(modelK); |
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| 88 | crossModel.push_back(modelL); |
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| 89 | crossModel.push_back(modelM); |
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| 90 | |
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| 91 | //std::cout << "PixeCrossSectionHandler constructor - crossModel[0] = " |
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| 92 | // << crossModel[0] |
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| 93 | // << std::endl; |
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| 94 | |
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| 95 | ActiveElements(); |
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| 96 | } |
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| 97 | |
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| 98 | G4PixeCrossSectionHandler::~G4PixeCrossSectionHandler() |
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| 99 | { |
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| 100 | delete interpolation; |
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| 101 | interpolation = 0; |
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| 102 | std::map<G4int,G4IDataSet*,std::less<G4int> >::iterator pos; |
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| 103 | |
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| 104 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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| 105 | { |
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| 106 | // The following is a workaround for STL ObjectSpace implementation, |
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| 107 | // which does not support the standard and does not accept |
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| 108 | // the syntax pos->second |
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| 109 | // G4IDataSet* dataSet = pos->second; |
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| 110 | G4IDataSet* dataSet = (*pos).second; |
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| 111 | delete dataSet; |
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| 112 | } |
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| 113 | |
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| 114 | if (crossSections != 0) |
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| 115 | { |
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| 116 | size_t n = crossSections->size(); |
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| 117 | for (size_t i=0; i<n; i++) |
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| 118 | { |
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| 119 | delete (*crossSections)[i]; |
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| 120 | } |
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| 121 | delete crossSections; |
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| 122 | crossSections = 0; |
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| 123 | } |
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| 124 | } |
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| 125 | |
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| 126 | void G4PixeCrossSectionHandler::Initialise(G4IInterpolator* algorithm, |
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| 127 | const G4String& modelK, |
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| 128 | const G4String& modelL, |
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| 129 | const G4String& modelM, |
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| 130 | G4double minE, G4double maxE, |
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| 131 | G4int numberOfBins, |
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| 132 | G4double unitE, G4double unitData, |
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| 133 | G4int minZ, G4int maxZ) |
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| 134 | { |
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| 135 | if (algorithm != 0) |
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| 136 | { |
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| 137 | delete interpolation; |
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| 138 | interpolation = algorithm; |
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| 139 | } |
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| 140 | else |
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| 141 | { |
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| 142 | interpolation = CreateInterpolation(); |
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| 143 | } |
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| 144 | |
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| 145 | eMin = minE; |
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| 146 | eMax = maxE; |
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| 147 | nBins = numberOfBins; |
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| 148 | unit1 = unitE; |
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| 149 | unit2 = unitData; |
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| 150 | zMin = minZ; |
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| 151 | zMax = maxZ; |
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| 152 | |
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| 153 | crossModel.push_back(modelK); |
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| 154 | crossModel.push_back(modelL); |
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| 155 | crossModel.push_back(modelM); |
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| 156 | |
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| 157 | } |
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| 158 | |
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| 159 | void G4PixeCrossSectionHandler::PrintData() const |
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| 160 | { |
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| 161 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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| 162 | |
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| 163 | for (pos = dataMap.begin(); pos != dataMap.end(); pos++) |
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| 164 | { |
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| 165 | // The following is a workaround for STL ObjectSpace implementation, |
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| 166 | // which does not support the standard and does not accept |
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| 167 | // the syntax pos->first or pos->second |
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| 168 | // G4int z = pos->first; |
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| 169 | // G4IDataSet* dataSet = pos->second; |
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| 170 | G4int z = (*pos).first; |
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| 171 | G4IDataSet* dataSet = (*pos).second; |
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| 172 | G4cout << "---- Data set for Z = " |
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| 173 | << z |
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| 174 | << G4endl; |
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| 175 | dataSet->PrintData(); |
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| 176 | G4cout << "--------------------------------------------------" << G4endl; |
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| 177 | } |
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| 178 | } |
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| 179 | |
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| 180 | void G4PixeCrossSectionHandler::LoadShellData(const G4String& fileName) |
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| 181 | { |
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| 182 | size_t nZ = activeZ.size(); |
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| 183 | for (size_t i=0; i<nZ; i++) |
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| 184 | { |
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| 185 | G4int Z = (G4int) activeZ[i]; |
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| 186 | G4IInterpolator* algo = interpolation->Clone(); |
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| 187 | G4IDataSet* dataSet = new G4PixeShellDataSet(Z, algo,crossModel[0],crossModel[1],crossModel[2]); |
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| 188 | |
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| 189 | // Degug printing |
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| 190 | //std::cout << "PixeCrossSectionHandler::Load - " |
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| 191 | // << Z |
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| 192 | // << ", modelK = " |
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| 193 | // << crossModel[0] |
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| 194 | // << " fileName = " |
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| 195 | // << fileName |
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| 196 | // << std::endl; |
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| 197 | |
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| 198 | dataSet->LoadData(fileName); |
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| 199 | dataMap[Z] = dataSet; |
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| 200 | } |
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| 201 | |
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| 202 | // Build cross sections for materials if not already built |
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| 203 | if (! crossSections) |
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| 204 | { |
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| 205 | BuildForMaterials(); |
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| 206 | } |
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| 207 | |
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| 208 | } |
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| 209 | |
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| 210 | void G4PixeCrossSectionHandler::Clear() |
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| 211 | { |
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| 212 | // Reset the map of data sets: remove the data sets from the map |
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| 213 | std::map<G4int,G4IDataSet*,std::less<G4int> >::iterator pos; |
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| 214 | |
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| 215 | if(! dataMap.empty()) |
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| 216 | { |
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| 217 | for (pos = dataMap.begin(); pos != dataMap.end(); ++pos) |
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| 218 | { |
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| 219 | // The following is a workaround for STL ObjectSpace implementation, |
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| 220 | // which does not support the standard and does not accept |
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| 221 | // the syntax pos->first or pos->second |
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| 222 | // G4IDataSet* dataSet = pos->second; |
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| 223 | G4IDataSet* dataSet = (*pos).second; |
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| 224 | delete dataSet; |
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| 225 | dataSet = 0; |
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| 226 | G4int i = (*pos).first; |
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| 227 | dataMap[i] = 0; |
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| 228 | } |
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| 229 | dataMap.clear(); |
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| 230 | } |
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| 231 | |
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| 232 | activeZ.clear(); |
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| 233 | ActiveElements(); |
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| 234 | } |
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| 235 | |
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| 236 | G4double G4PixeCrossSectionHandler::FindValue(G4int Z, G4double energy) const |
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| 237 | { |
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| 238 | G4double value = 0.; |
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| 239 | |
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| 240 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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| 241 | pos = dataMap.find(Z); |
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| 242 | if (pos!= dataMap.end()) |
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| 243 | { |
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| 244 | // The following is a workaround for STL ObjectSpace implementation, |
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| 245 | // which does not support the standard and does not accept |
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| 246 | // the syntax pos->first or pos->second |
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| 247 | // G4IDataSet* dataSet = pos->second; |
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| 248 | G4IDataSet* dataSet = (*pos).second; |
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| 249 | value = dataSet->FindValue(energy); |
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| 250 | } |
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| 251 | else |
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| 252 | { |
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| 253 | G4cout << "WARNING: G4PixeCrossSectionHandler::FindValue(Z,e) did not find Z = " |
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| 254 | << Z << G4endl; |
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| 255 | } |
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| 256 | return value; |
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| 257 | } |
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| 258 | |
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| 259 | G4double G4PixeCrossSectionHandler::FindValue(G4int Z, G4double energy, |
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| 260 | G4int shellIndex) const |
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| 261 | { |
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| 262 | G4double value = 0.; |
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| 263 | |
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| 264 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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| 265 | pos = dataMap.find(Z); |
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| 266 | if (pos!= dataMap.end()) |
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| 267 | { |
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| 268 | // The following is a workaround for STL ObjectSpace implementation, |
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| 269 | // which does not support the standard and does not accept |
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| 270 | // the syntax pos->first or pos->second |
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| 271 | // G4IDataSet* dataSet = pos->second; |
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| 272 | G4IDataSet* dataSet = (*pos).second; |
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| 273 | if (shellIndex >= 0) |
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| 274 | { |
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| 275 | G4int nComponents = dataSet->NumberOfComponents(); |
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| 276 | if(shellIndex < nComponents) |
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| 277 | // The value is the cross section for shell component at given energy |
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| 278 | value = dataSet->GetComponent(shellIndex)->FindValue(energy); |
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| 279 | else |
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| 280 | { |
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| 281 | G4cout << "WARNING: G4PixeCrossSectionHandler::FindValue(Z,e,shell) did not find" |
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| 282 | << " shellIndex= " << shellIndex |
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| 283 | << " for Z= " |
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| 284 | << Z << G4endl; |
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| 285 | } |
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| 286 | } else { |
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| 287 | value = dataSet->FindValue(energy); |
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| 288 | } |
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| 289 | } |
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| 290 | else |
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| 291 | { |
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| 292 | G4cout << "WARNING: G4PixeCrossSectionHandler::FindValue did not find Z = " |
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| 293 | << Z << G4endl; |
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| 294 | } |
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| 295 | return value; |
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| 296 | } |
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| 297 | |
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| 298 | |
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| 299 | G4double G4PixeCrossSectionHandler::ValueForMaterial(const G4Material* material, |
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| 300 | G4double energy) const |
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| 301 | { |
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| 302 | G4double value = 0.; |
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| 303 | |
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| 304 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 305 | const G4double* nAtomsPerVolume = material->GetVecNbOfAtomsPerVolume(); |
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| 306 | G4int nElements = material->GetNumberOfElements(); |
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| 307 | |
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| 308 | for (G4int i=0 ; i<nElements ; i++) |
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| 309 | { |
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| 310 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
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| 311 | G4double elementValue = FindValue(Z,energy); |
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| 312 | G4double nAtomsVol = nAtomsPerVolume[i]; |
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| 313 | value += nAtomsVol * elementValue; |
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| 314 | } |
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| 315 | |
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| 316 | return value; |
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| 317 | } |
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| 318 | |
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| 319 | /* |
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| 320 | G4IDataSet* G4PixeCrossSectionHandler::BuildMeanFreePathForMaterials(const G4DataVector* energyCuts ) |
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| 321 | { |
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| 322 | // Builds a CompositeDataSet containing the mean free path for each material |
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| 323 | // in the material table |
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| 324 | |
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| 325 | G4DataVector energyVector; |
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| 326 | G4double dBin = std::log10(eMax/eMin) / nBins; |
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| 327 | |
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| 328 | for (G4int i=0; i<nBins+1; i++) |
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| 329 | { |
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| 330 | energyVector.push_back(std::pow(10., std::log10(eMin)+i*dBin)); |
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| 331 | } |
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| 332 | |
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| 333 | // Factory method to build cross sections in derived classes, |
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| 334 | // related to the type of physics process |
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| 335 | |
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| 336 | if (crossSections != 0) |
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| 337 | { // Reset the list of cross sections |
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| 338 | std::vector<G4IDataSet*>::iterator mat; |
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| 339 | if (! crossSections->empty()) |
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| 340 | { |
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| 341 | for (mat = crossSections->begin(); mat!= crossSections->end(); ++mat) |
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| 342 | { |
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| 343 | G4IDataSet* set = *mat; |
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| 344 | delete set; |
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| 345 | set = 0; |
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| 346 | } |
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| 347 | crossSections->clear(); |
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| 348 | delete crossSections; |
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| 349 | crossSections = 0; |
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| 350 | } |
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| 351 | } |
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| 352 | |
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| 353 | crossSections = BuildCrossSectionsForMaterials(energyVector); |
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| 354 | |
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| 355 | if (crossSections == 0) |
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| 356 | G4Exception("G4PixeCrossSectionHandler::BuildMeanFreePathForMaterials, crossSections = 0"); |
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| 357 | |
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| 358 | G4IInterpolator* algo = CreateInterpolation(); |
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| 359 | G4IDataSet* materialSet = new G4CompositeDataSet(algo); |
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| 360 | |
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| 361 | G4DataVector* energies; |
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| 362 | G4DataVector* data; |
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| 363 | |
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| 364 | const G4ProductionCutsTable* theCoupleTable= |
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| 365 | G4ProductionCutsTable::GetProductionCutsTable(); |
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| 366 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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| 367 | |
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| 368 | |
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| 369 | for (size_t m=0; m<numOfCouples; m++) |
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| 370 | { |
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| 371 | energies = new G4DataVector; |
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| 372 | data = new G4DataVector; |
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| 373 | for (G4int bin=0; bin<nBins; bin++) |
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| 374 | { |
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| 375 | G4double energy = energyVector[bin]; |
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| 376 | energies->push_back(energy); |
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| 377 | G4IDataSet* matCrossSet = (*crossSections)[m]; |
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| 378 | G4double materialCrossSection = 0.0; |
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| 379 | G4int nElm = matCrossSet->NumberOfComponents(); |
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| 380 | for(G4int j=0; j<nElm; j++) { |
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| 381 | materialCrossSection += matCrossSet->GetComponent(j)->FindValue(energy); |
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| 382 | } |
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| 383 | |
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| 384 | if (materialCrossSection > 0.) |
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| 385 | { |
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| 386 | data->push_back(1./materialCrossSection); |
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| 387 | } |
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| 388 | else |
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| 389 | { |
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| 390 | data->push_back(DBL_MAX); |
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| 391 | } |
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| 392 | } |
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| 393 | G4IInterpolator* algo = CreateInterpolation(); |
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| 394 | G4IDataSet* dataSet = new G4DataSet(m,energies,data,algo,1.,1.); |
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| 395 | materialSet->AddComponent(dataSet); |
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| 396 | } |
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| 397 | |
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| 398 | return materialSet; |
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| 399 | } |
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| 400 | |
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| 401 | */ |
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| 402 | |
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| 403 | void G4PixeCrossSectionHandler::BuildForMaterials() |
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| 404 | { |
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| 405 | // Builds a CompositeDataSet containing the mean free path for each material |
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| 406 | // in the material table |
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| 407 | |
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| 408 | G4DataVector energyVector; |
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| 409 | G4double dBin = std::log10(eMax/eMin) / nBins; |
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| 410 | |
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| 411 | for (G4int i=0; i<nBins+1; i++) |
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| 412 | { |
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| 413 | energyVector.push_back(std::pow(10., std::log10(eMin)+i*dBin)); |
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| 414 | } |
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| 415 | |
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| 416 | if (crossSections != 0) |
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| 417 | { // Reset the list of cross sections |
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| 418 | std::vector<G4IDataSet*>::iterator mat; |
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| 419 | if (! crossSections->empty()) |
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| 420 | { |
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| 421 | for (mat = crossSections->begin(); mat!= crossSections->end(); ++mat) |
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| 422 | { |
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| 423 | G4IDataSet* set = *mat; |
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| 424 | delete set; |
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| 425 | set = 0; |
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| 426 | } |
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| 427 | crossSections->clear(); |
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| 428 | delete crossSections; |
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| 429 | crossSections = 0; |
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| 430 | } |
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| 431 | } |
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| 432 | |
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| 433 | crossSections = BuildCrossSectionsForMaterials(energyVector); |
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| 434 | |
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| 435 | if (crossSections == 0) |
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| 436 | G4Exception("G4PixeCrossSectionHandler::BuildForMaterials, crossSections = 0"); |
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| 437 | |
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| 438 | return; |
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| 439 | } |
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| 440 | |
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| 441 | |
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| 442 | G4int G4PixeCrossSectionHandler::SelectRandomAtom(const G4Material* material, |
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| 443 | G4double e) const |
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| 444 | { |
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| 445 | // Select randomly an element within the material, according to the weight |
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| 446 | // determined by the cross sections in the data set |
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| 447 | |
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| 448 | G4int nElements = material->GetNumberOfElements(); |
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| 449 | |
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| 450 | // Special case: the material consists of one element |
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| 451 | if (nElements == 1) |
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| 452 | { |
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| 453 | G4int Z = (G4int) material->GetZ(); |
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| 454 | return Z; |
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| 455 | } |
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| 456 | |
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| 457 | // Composite material |
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| 458 | |
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| 459 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 460 | size_t materialIndex = material->GetIndex(); |
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| 461 | |
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| 462 | G4IDataSet* materialSet = (*crossSections)[materialIndex]; |
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| 463 | G4double materialCrossSection0 = 0.0; |
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| 464 | G4DataVector cross; |
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| 465 | cross.clear(); |
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| 466 | for ( G4int i=0; i < nElements; i++ ) |
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| 467 | { |
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| 468 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
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| 469 | materialCrossSection0 += cr; |
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| 470 | cross.push_back(materialCrossSection0); |
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| 471 | } |
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| 472 | |
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| 473 | G4double random = G4UniformRand() * materialCrossSection0; |
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| 474 | |
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| 475 | for (G4int k=0 ; k < nElements ; k++ ) |
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| 476 | { |
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| 477 | if (random <= cross[k]) return (G4int) (*elementVector)[k]->GetZ(); |
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| 478 | } |
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| 479 | // It should never get here |
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| 480 | return 0; |
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| 481 | } |
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| 482 | |
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| 483 | /* |
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| 484 | const G4Element* G4PixeCrossSectionHandler::SelectRandomElement(const G4MaterialCutsCouple* couple, |
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| 485 | G4double e) const |
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| 486 | { |
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| 487 | // Select randomly an element within the material, according to the weight determined |
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| 488 | // by the cross sections in the data set |
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| 489 | |
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| 490 | const G4Material* material = couple->GetMaterial(); |
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| 491 | G4Element* nullElement = 0; |
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| 492 | G4int nElements = material->GetNumberOfElements(); |
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| 493 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 494 | |
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| 495 | // Special case: the material consists of one element |
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| 496 | if (nElements == 1) |
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| 497 | { |
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| 498 | G4Element* element = (*elementVector)[0]; |
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| 499 | return element; |
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| 500 | } |
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| 501 | else |
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| 502 | { |
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| 503 | // Composite material |
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| 504 | |
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| 505 | size_t materialIndex = couple->GetIndex(); |
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| 506 | |
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| 507 | G4IDataSet* materialSet = (*crossSections)[materialIndex]; |
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| 508 | G4double materialCrossSection0 = 0.0; |
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| 509 | G4DataVector cross; |
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| 510 | cross.clear(); |
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| 511 | for (G4int i=0; i<nElements; i++) |
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| 512 | { |
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| 513 | G4double cr = materialSet->GetComponent(i)->FindValue(e); |
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| 514 | materialCrossSection0 += cr; |
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| 515 | cross.push_back(materialCrossSection0); |
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| 516 | } |
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| 517 | |
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| 518 | G4double random = G4UniformRand() * materialCrossSection0; |
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| 519 | |
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| 520 | for (G4int k=0 ; k < nElements ; k++ ) |
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| 521 | { |
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| 522 | if (random <= cross[k]) return (*elementVector)[k]; |
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| 523 | } |
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| 524 | // It should never end up here |
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| 525 | G4cout << "G4PixeCrossSectionHandler::SelectRandomElement - no element found" << G4endl; |
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| 526 | return nullElement; |
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| 527 | } |
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| 528 | } |
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| 529 | */ |
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| 530 | |
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| 531 | |
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| 532 | G4int G4PixeCrossSectionHandler::SelectRandomShell(G4int Z, G4double e) const |
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| 533 | { |
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| 534 | // Select randomly a shell, according to the weight determined by the cross sections |
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| 535 | // in the data set |
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| 536 | |
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| 537 | // Note for later improvement: it would be useful to add a cache mechanism for already |
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| 538 | // used shells to improve performance |
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| 539 | |
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| 540 | G4int shell = 0; |
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| 541 | |
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| 542 | G4double totCrossSection = FindValue(Z,e); |
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| 543 | G4double random = G4UniformRand() * totCrossSection; |
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| 544 | G4double partialSum = 0.; |
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| 545 | |
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| 546 | G4IDataSet* dataSet = 0; |
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| 547 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
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| 548 | pos = dataMap.find(Z); |
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| 549 | // The following is a workaround for STL ObjectSpace implementation, |
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| 550 | // which does not support the standard and does not accept |
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| 551 | // the syntax pos->first or pos->second |
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| 552 | // if (pos != dataMap.end()) dataSet = pos->second; |
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| 553 | if (pos != dataMap.end()) dataSet = (*pos).second; |
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| 554 | |
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| 555 | size_t nShells = dataSet->NumberOfComponents(); |
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| 556 | for (size_t i=0; i<nShells; i++) |
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| 557 | { |
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| 558 | const G4IDataSet* shellDataSet = dataSet->GetComponent(i); |
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| 559 | if (shellDataSet != 0) |
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| 560 | { |
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| 561 | G4double value = shellDataSet->FindValue(e); |
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| 562 | partialSum += value; |
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| 563 | if (random <= partialSum) return i; |
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| 564 | } |
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| 565 | } |
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| 566 | // It should never get here |
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| 567 | return shell; |
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| 568 | } |
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| 569 | |
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| 570 | void G4PixeCrossSectionHandler::ActiveElements() |
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| 571 | { |
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| 572 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
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| 573 | if (materialTable == 0) |
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| 574 | G4Exception("G4PixeCrossSectionHandler::ActiveElements - no MaterialTable found)"); |
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| 575 | |
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| 576 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
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| 577 | |
---|
| 578 | for (G4int m=0; m<nMaterials; m++) |
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| 579 | { |
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| 580 | const G4Material* material= (*materialTable)[m]; |
---|
| 581 | const G4ElementVector* elementVector = material->GetElementVector(); |
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| 582 | const G4int nElements = material->GetNumberOfElements(); |
---|
| 583 | |
---|
| 584 | for (G4int iEl=0; iEl<nElements; iEl++) |
---|
| 585 | { |
---|
| 586 | G4Element* element = (*elementVector)[iEl]; |
---|
| 587 | G4double Z = element->GetZ(); |
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| 588 | if (!(activeZ.contains(Z)) && Z >= zMin && Z <= zMax) |
---|
| 589 | { |
---|
| 590 | activeZ.push_back(Z); |
---|
| 591 | } |
---|
| 592 | } |
---|
| 593 | } |
---|
| 594 | } |
---|
| 595 | |
---|
| 596 | G4IInterpolator* G4PixeCrossSectionHandler::CreateInterpolation() |
---|
| 597 | { |
---|
| 598 | G4IInterpolator* algorithm = new G4LogLogInterpolator; |
---|
| 599 | return algorithm; |
---|
| 600 | } |
---|
| 601 | |
---|
| 602 | G4int G4PixeCrossSectionHandler::NumberOfComponents(G4int Z) const |
---|
| 603 | { |
---|
| 604 | G4int n = 0; |
---|
| 605 | |
---|
| 606 | std::map<G4int,G4IDataSet*,std::less<G4int> >::const_iterator pos; |
---|
| 607 | pos = dataMap.find(Z); |
---|
| 608 | if (pos!= dataMap.end()) |
---|
| 609 | { |
---|
| 610 | G4IDataSet* dataSet = (*pos).second; |
---|
| 611 | n = dataSet->NumberOfComponents(); |
---|
| 612 | } |
---|
| 613 | else |
---|
| 614 | { |
---|
| 615 | G4cout << "WARNING: G4PixeCrossSectionHandler::NumberOfComponents did not " |
---|
| 616 | << "find Z = " |
---|
| 617 | << Z << G4endl; |
---|
| 618 | } |
---|
| 619 | return n; |
---|
| 620 | } |
---|
| 621 | |
---|
| 622 | |
---|
| 623 | std::vector<G4IDataSet*>* |
---|
| 624 | G4PixeCrossSectionHandler::BuildCrossSectionsForMaterials(const G4DataVector& energyVector) |
---|
| 625 | { |
---|
| 626 | G4DataVector* energies; |
---|
| 627 | G4DataVector* data; |
---|
| 628 | |
---|
| 629 | std::vector<G4IDataSet*>* matCrossSections = new std::vector<G4IDataSet*>; |
---|
| 630 | |
---|
| 631 | //const G4ProductionCutsTable* theCoupleTable=G4ProductionCutsTable::GetProductionCutsTable(); |
---|
| 632 | //size_t numOfCouples = theCoupleTable->GetTableSize(); |
---|
| 633 | |
---|
| 634 | size_t nOfBins = energyVector.size(); |
---|
| 635 | const G4IInterpolator* interpolationAlgo = CreateInterpolation(); |
---|
| 636 | |
---|
| 637 | const G4MaterialTable* materialTable = G4Material::GetMaterialTable(); |
---|
| 638 | if (materialTable == 0) |
---|
| 639 | G4Exception("G4PixeCrossSectionHandler - no MaterialTable found)"); |
---|
| 640 | |
---|
| 641 | G4int nMaterials = G4Material::GetNumberOfMaterials(); |
---|
| 642 | |
---|
| 643 | for (G4int m=0; m<nMaterials; m++) |
---|
| 644 | { |
---|
| 645 | const G4Material* material = (*materialTable)[m]; |
---|
| 646 | G4int nElements = material->GetNumberOfElements(); |
---|
| 647 | const G4ElementVector* elementVector = material->GetElementVector(); |
---|
| 648 | const G4double* nAtomsPerVolume = material->GetAtomicNumDensityVector(); |
---|
| 649 | |
---|
| 650 | G4IInterpolator* algo = interpolationAlgo->Clone(); |
---|
| 651 | |
---|
| 652 | G4IDataSet* setForMat = new G4CompositeDataSet(algo,1.,1.); |
---|
| 653 | |
---|
| 654 | for (G4int i=0; i<nElements; i++) { |
---|
| 655 | |
---|
| 656 | G4int Z = (G4int) (*elementVector)[i]->GetZ(); |
---|
| 657 | G4double density = nAtomsPerVolume[i]; |
---|
| 658 | |
---|
| 659 | energies = new G4DataVector; |
---|
| 660 | data = new G4DataVector; |
---|
| 661 | |
---|
| 662 | |
---|
| 663 | for (size_t bin=0; bin<nOfBins; bin++) |
---|
| 664 | { |
---|
| 665 | G4double e = energyVector[bin]; |
---|
| 666 | energies->push_back(e); |
---|
| 667 | G4double cross = 0.; |
---|
| 668 | if (Z >= zMin && Z <= zMax) cross = density*FindValue(Z,e); |
---|
| 669 | data->push_back(cross); |
---|
| 670 | } |
---|
| 671 | |
---|
| 672 | G4IInterpolator* algo1 = interpolationAlgo->Clone(); |
---|
| 673 | G4IDataSet* elSet = new G4DataSet(i,energies,data,algo1,1.,1.); |
---|
| 674 | setForMat->AddComponent(elSet); |
---|
| 675 | } |
---|
| 676 | |
---|
| 677 | matCrossSections->push_back(setForMat); |
---|
| 678 | } |
---|
| 679 | return matCrossSections; |
---|
| 680 | } |
---|
| 681 | |
---|
| 682 | |
---|
| 683 | G4double G4PixeCrossSectionHandler::MicroscopicCrossSection(const G4ParticleDefinition* particleDef, |
---|
| 684 | G4double kineticEnergy, |
---|
| 685 | G4double Z, |
---|
| 686 | G4double deltaCut) const |
---|
| 687 | { |
---|
| 688 | // Cross section formula is OK for spin=0, 1/2, 1 only ! |
---|
| 689 | // Calculates the microscopic cross section in Geant4 internal units |
---|
| 690 | // Formula documented in Geant4 Phys. Ref. Manual |
---|
| 691 | // ( it is called for elements, AtomicNumber = z ) |
---|
| 692 | |
---|
| 693 | G4double cross = 0.; |
---|
| 694 | |
---|
| 695 | // Particle mass and energy |
---|
| 696 | G4double particleMass = particleDef->GetPDGMass(); |
---|
| 697 | G4double energy = kineticEnergy + particleMass; |
---|
| 698 | |
---|
| 699 | // Some kinematics |
---|
| 700 | G4double gamma = energy / particleMass; |
---|
| 701 | G4double beta2 = 1. - 1. / (gamma * gamma); |
---|
| 702 | G4double var = electron_mass_c2 / particleMass; |
---|
| 703 | G4double tMax = 2. * electron_mass_c2 * (gamma*gamma - 1.) / (1. + 2.*gamma*var + var*var); |
---|
| 704 | |
---|
| 705 | // Calculate the total cross section |
---|
| 706 | |
---|
| 707 | if ( tMax > deltaCut ) |
---|
| 708 | { |
---|
| 709 | var = deltaCut / tMax; |
---|
| 710 | cross = (1. - var * (1. - beta2 * std::log(var))) / deltaCut; |
---|
| 711 | |
---|
| 712 | G4double spin = particleDef->GetPDGSpin() ; |
---|
| 713 | |
---|
| 714 | // +term for spin=1/2 particle |
---|
| 715 | if (spin == 0.5) |
---|
| 716 | { |
---|
| 717 | cross += 0.5 * (tMax - deltaCut) / (energy*energy); |
---|
| 718 | } |
---|
| 719 | // +term for spin=1 particle |
---|
| 720 | else if (spin > 0.9 ) |
---|
| 721 | { |
---|
| 722 | cross += -std::log(var) / (3.*deltaCut) + (tMax-deltaCut) * |
---|
| 723 | ((5.+1./var)*0.25 /(energy*energy) - beta2 / (tMax*deltaCut))/3.; |
---|
| 724 | } |
---|
| 725 | cross *= twopi_mc2_rcl2 * Z / beta2 ; |
---|
| 726 | } |
---|
| 727 | |
---|
| 728 | //std::cout << "Microscopic = " << cross/barn |
---|
| 729 | // << ", e = " << kineticEnergy/MeV <<std:: endl; |
---|
| 730 | |
---|
| 731 | return cross; |
---|
| 732 | } |
---|
| 733 | |
---|