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 | // $Id: G4FinalStateElasticChampion.cc,v 1.7 2008/12/10 18:25:28 sincerti Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-02 $ |
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28 | // ------------------------------------------------------------------- |
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29 | |
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30 | |
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31 | #include "G4FinalStateElasticChampion.hh" |
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32 | |
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33 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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34 | |
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35 | G4FinalStateElasticChampion::G4FinalStateElasticChampion() |
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36 | { |
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37 | G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition(); |
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38 | |
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39 | lowEnergyLimit = 8.23* eV; // SI : i/o of 7. * eV; |
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40 | highEnergyLimit = 10. * keV; |
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41 | |
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42 | G4double scaleFactor = 1e-16*cm*cm; |
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43 | |
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44 | char *path = getenv("G4LEDATA"); |
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45 | |
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46 | if (!path) |
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47 | G4Exception("G4FinalStateElasticChampion: constructor: G4LEDATA environment variable not set"); |
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48 | |
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49 | if (electronDef != 0) |
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50 | { |
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51 | std::ostringstream eFullFileName; |
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52 | eFullFileName << path << "/dna/sigmadiff_elastic_e_champion.dat"; |
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53 | std::ifstream eDiffCrossSection(eFullFileName.str().c_str()); |
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54 | |
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55 | if (!eDiffCrossSection) G4Exception("G4FinalStateElasticChampion: constructor: error opening electron DATA FILE"); |
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56 | |
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57 | eTdummyVec.push_back(0.); |
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58 | |
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59 | while(!eDiffCrossSection.eof()) |
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60 | { |
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61 | double tDummy; |
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62 | double eDummy; |
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63 | eDiffCrossSection>>tDummy>>eDummy; |
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64 | |
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65 | // SI : mandatory eVecm initialization |
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66 | if (tDummy != eTdummyVec.back()) |
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67 | { |
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68 | eTdummyVec.push_back(tDummy); |
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69 | eVecm[tDummy].push_back(0.); |
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70 | } |
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71 | |
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72 | eDiffCrossSection>>eDiffCrossSectionData[0][tDummy][eDummy]; |
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73 | |
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74 | // SI : only if not end of file reached ! |
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75 | if (!eDiffCrossSection.eof()) eDiffCrossSectionData[0][tDummy][eDummy]*=scaleFactor; |
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76 | |
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77 | if (eDummy != eVecm[tDummy].back()) eVecm[tDummy].push_back(eDummy); |
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78 | |
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79 | } |
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80 | |
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81 | } |
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82 | else |
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83 | { |
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84 | G4Exception("G4FinalStateElastiChampion : constructor: electron is not defined"); |
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85 | } |
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86 | } |
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87 | |
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88 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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89 | |
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90 | G4FinalStateElasticChampion::~G4FinalStateElasticChampion() |
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91 | { |
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92 | eVecm.clear(); |
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93 | } |
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94 | |
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95 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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96 | |
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97 | const G4FinalStateProduct& G4FinalStateElasticChampion::GenerateFinalState(const G4Track& track, const G4Step& ) |
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98 | { |
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99 | product.Clear(); |
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100 | |
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101 | G4double k = track.GetDynamicParticle()->GetKineticEnergy(); |
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102 | |
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103 | if (k>= lowEnergyLimit && k < highEnergyLimit) |
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104 | { |
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105 | G4double cosTheta = RandomizeCosTheta(k); |
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106 | |
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107 | G4double phi = 2. * pi * G4UniformRand(); |
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108 | |
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109 | G4ThreeVector zVers = track.GetDynamicParticle()->GetMomentumDirection(); |
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110 | G4ThreeVector xVers = zVers.orthogonal(); |
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111 | G4ThreeVector yVers = zVers.cross(xVers); |
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112 | |
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113 | G4double xDir = std::sqrt(1. - cosTheta*cosTheta); |
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114 | G4double yDir = xDir; |
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115 | xDir *= std::cos(phi); |
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116 | yDir *= std::sin(phi); |
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117 | |
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118 | G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers)); |
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119 | |
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120 | product.ModifyPrimaryParticle(zPrimeVers,k); |
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121 | } |
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122 | |
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123 | if (k<lowEnergyLimit) |
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124 | { |
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125 | product.KillPrimaryParticle(); |
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126 | } |
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127 | |
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128 | return product; |
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129 | } |
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130 | |
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131 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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132 | |
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133 | G4double G4FinalStateElasticChampion::DifferentialCrossSection |
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134 | (G4ParticleDefinition * particleDefinition, G4double k, G4double theta) |
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135 | { |
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136 | G4double sigma = 0.; |
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137 | G4double valueT1 = 0; |
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138 | G4double valueT2 = 0; |
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139 | G4double valueE21 = 0; |
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140 | G4double valueE22 = 0; |
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141 | G4double valueE12 = 0; |
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142 | G4double valueE11 = 0; |
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143 | G4double xs11 = 0; |
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144 | G4double xs12 = 0; |
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145 | G4double xs21 = 0; |
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146 | G4double xs22 = 0; |
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147 | |
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148 | //SI : ensure the correct computation of cross section at the 180*deg limit |
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149 | if (theta==180.) theta=theta-1e-9; |
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150 | |
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151 | if (particleDefinition == G4Electron::ElectronDefinition()) |
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152 | { |
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153 | std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k); |
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154 | std::vector<double>::iterator t1 = t2-1; |
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155 | |
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156 | std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), theta); |
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157 | std::vector<double>::iterator e11 = e12-1; |
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158 | |
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159 | std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), theta); |
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160 | std::vector<double>::iterator e21 = e22-1; |
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161 | |
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162 | valueT1 =*t1; |
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163 | valueT2 =*t2; |
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164 | valueE21 =*e21; |
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165 | valueE22 =*e22; |
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166 | valueE12 =*e12; |
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167 | valueE11 =*e11; |
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168 | |
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169 | xs11 = eDiffCrossSectionData[0][valueT1][valueE11]; |
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170 | xs12 = eDiffCrossSectionData[0][valueT1][valueE12]; |
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171 | xs21 = eDiffCrossSectionData[0][valueT2][valueE21]; |
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172 | xs22 = eDiffCrossSectionData[0][valueT2][valueE22]; |
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173 | } |
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174 | |
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175 | G4double xsProduct = xs11 * xs12 * xs21 * xs22; |
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176 | |
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177 | if (xs11==0 || xs12==0 ||xs21==0 ||xs22==0) return (0.); |
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178 | |
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179 | if (xsProduct != 0.) |
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180 | { |
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181 | sigma = QuadInterpolator( valueE11, valueE12, |
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182 | valueE21, valueE22, |
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183 | xs11, xs12, |
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184 | xs21, xs22, |
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185 | valueT1, valueT2, |
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186 | k, theta ); |
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187 | } |
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188 | |
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189 | return sigma; |
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190 | } |
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191 | |
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192 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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193 | |
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194 | G4double G4FinalStateElasticChampion::LinLogInterpolate(G4double e1, |
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195 | G4double e2, |
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196 | G4double e, |
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197 | G4double xs1, |
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198 | G4double xs2) |
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199 | { |
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200 | G4double d1 = std::log(xs1); |
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201 | G4double d2 = std::log(xs2); |
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202 | G4double value = std::exp(d1 + (d2 - d1)*(e - e1)/ (e2 - e1)); |
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203 | return value; |
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204 | } |
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205 | |
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206 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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207 | |
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208 | G4double G4FinalStateElasticChampion::LogLogInterpolate(G4double e1, |
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209 | G4double e2, |
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210 | G4double e, |
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211 | G4double xs1, |
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212 | G4double xs2) |
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213 | { |
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214 | G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1)); |
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215 | G4double b = std::log10(xs2) - a*std::log10(e2); |
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216 | G4double sigma = a*std::log10(e) + b; |
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217 | G4double value = (std::pow(10.,sigma)); |
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218 | return value; |
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219 | } |
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220 | |
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221 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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222 | |
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223 | G4double G4FinalStateElasticChampion::QuadInterpolator(G4double e11, G4double e12, |
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224 | G4double e21, G4double e22, |
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225 | G4double xs11, G4double xs12, |
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226 | G4double xs21, G4double xs22, |
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227 | G4double t1, G4double t2, |
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228 | G4double t, G4double e) |
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229 | { |
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230 | // Log-Log |
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231 | /* |
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232 | G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12); |
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233 | G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22); |
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234 | G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2); |
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235 | */ |
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236 | |
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237 | // Lin-Log |
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238 | G4double interpolatedvalue1 = LinLogInterpolate(e11, e12, e, xs11, xs12); |
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239 | G4double interpolatedvalue2 = LinLogInterpolate(e21, e22, e, xs21, xs22); |
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240 | G4double value = LinLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2); |
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241 | return value; |
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242 | } |
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243 | |
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244 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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245 | |
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246 | G4double G4FinalStateElasticChampion::RandomizeCosTheta(G4double k) |
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247 | { |
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248 | |
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249 | G4double cosTheta = -1; |
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250 | G4double cumul = 0; |
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251 | G4double value = 0; |
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252 | |
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253 | // Number of integration steps in the 0-180 deg range |
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254 | G4int iMax=180; |
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255 | |
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256 | G4double random = G4UniformRand(); |
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257 | |
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258 | // Cumulate differential cross section |
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259 | for (G4int i=0; i<iMax; i++) |
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260 | { |
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261 | cumul = cumul + DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1)); |
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262 | } |
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263 | |
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264 | // Select theta angle |
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265 | for (G4int i=0; i<iMax; i++) |
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266 | { |
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267 | value = value + DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1)) / cumul; |
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268 | if (random < value) |
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269 | { |
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270 | cosTheta=std::cos( deg*G4double(i)*180./(iMax-1) ); |
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271 | break; |
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272 | } |
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273 | } |
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274 | |
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275 | return cosTheta; |
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276 | } |
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