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: G4VRangeToEnergyConverter.cc,v 1.8 2007/06/06 05:13:34 urban Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------- |
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32 | // GEANT 4 class implementation file/ History: |
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33 | // 5 Oct. 2002, H.Kuirashige : Structure created based on object model |
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34 | // -------------------------------------------------------------- |
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35 | |
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36 | #include "G4VRangeToEnergyConverter.hh" |
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37 | #include "G4ParticleTable.hh" |
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38 | #include "G4Material.hh" |
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39 | #include "G4PhysicsLogVector.hh" |
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40 | |
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41 | #include "G4ios.hh" |
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42 | |
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43 | // energy range |
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44 | G4double G4VRangeToEnergyConverter::LowestEnergy = 0.99e-3*MeV; |
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45 | G4double G4VRangeToEnergyConverter::HighestEnergy = 100.0e6*MeV; |
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46 | |
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47 | G4VRangeToEnergyConverter::G4VRangeToEnergyConverter(): |
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48 | theParticle(0), theLossTable(0), NumberOfElements(0), TotBin(200), |
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49 | verboseLevel(1) |
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50 | { |
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51 | } |
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52 | |
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53 | G4VRangeToEnergyConverter::G4VRangeToEnergyConverter(const G4VRangeToEnergyConverter& right) |
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54 | { |
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55 | *this = right; |
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56 | } |
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57 | |
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58 | G4VRangeToEnergyConverter & G4VRangeToEnergyConverter::operator=(const G4VRangeToEnergyConverter &right) |
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59 | { |
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60 | if (this == &right) return *this; |
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61 | if (theLossTable) { |
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62 | theLossTable->clearAndDestroy(); |
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63 | delete theLossTable; |
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64 | theLossTable=0; |
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65 | } |
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66 | |
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67 | NumberOfElements = right.NumberOfElements; |
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68 | TotBin = right.TotBin; |
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69 | theParticle = right.theParticle; |
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70 | verboseLevel = right.verboseLevel; |
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71 | |
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72 | // create the loss table |
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73 | theLossTable = new G4LossTable(); |
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74 | theLossTable->reserve(G4Element::GetNumberOfElements()); |
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75 | // fill the loss table |
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76 | for (size_t j=0; j<size_t(NumberOfElements); j++){ |
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77 | G4LossVector* aVector= new |
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78 | G4LossVector(LowestEnergy, HighestEnergy, TotBin); |
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79 | for (size_t i=0; i<size_t(TotBin); i++) { |
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80 | G4double Value = (*((*right.theLossTable)[j]))[i]; |
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81 | aVector->PutValue(i,Value); |
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82 | } |
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83 | theLossTable->insert(aVector); |
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84 | } |
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85 | return *this; |
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86 | } |
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87 | |
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88 | |
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89 | G4VRangeToEnergyConverter::~G4VRangeToEnergyConverter() |
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90 | { |
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91 | if (theLossTable) { |
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92 | theLossTable->clearAndDestroy(); |
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93 | delete theLossTable; |
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94 | } |
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95 | theLossTable=0; |
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96 | } |
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97 | |
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98 | G4int G4VRangeToEnergyConverter::operator==(const G4VRangeToEnergyConverter &right) const |
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99 | { |
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100 | return this == &right; |
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101 | } |
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102 | |
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103 | G4int G4VRangeToEnergyConverter::operator!=(const G4VRangeToEnergyConverter &right) const |
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104 | { |
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105 | return this != &right; |
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106 | } |
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107 | |
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108 | |
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109 | // ********************************************************************** |
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110 | // ************************* Convert *********************************** |
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111 | // ********************************************************************** |
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112 | G4double G4VRangeToEnergyConverter::Convert(G4double rangeCut, |
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113 | const G4Material* material) |
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114 | { |
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115 | G4double Mass = theParticle->GetPDGMass(); |
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116 | G4double theKineticEnergyCuts = 0.; |
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117 | |
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118 | // Build the energy loss table |
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119 | BuildLossTable(); |
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120 | |
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121 | // Build range vector for every material, convert cut into energy-cut, |
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122 | // fill theKineticEnergyCuts and delete the range vector |
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123 | G4double tune = 0.025*mm*g/cm3 ,lowen = 30.*keV ; |
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124 | |
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125 | G4int idx = material->GetIndex(); |
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126 | G4double density = material->GetDensity() ; |
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127 | if(density > 0.) { |
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128 | G4RangeVector* rangeVector = new G4RangeVector(LowestEnergy, HighestEnergy, TotBin); |
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129 | BuildRangeVector(material, HighestEnergy, Mass, rangeVector); |
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130 | theKineticEnergyCuts = ConvertCutToKineticEnergy(rangeVector, rangeCut, idx); |
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131 | |
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132 | if( ((theParticle->GetParticleName()=="e-")||(theParticle->GetParticleName()=="e+")) |
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133 | && (theKineticEnergyCuts < lowen) ) |
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134 | |
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135 | // corr. should be switched on smoothly |
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136 | { theKineticEnergyCuts /= (1.+(1.-theKineticEnergyCuts/lowen)* |
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137 | tune/(rangeCut*density)); } |
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138 | if(theKineticEnergyCuts < LowestEnergy) { |
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139 | theKineticEnergyCuts = LowestEnergy ; |
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140 | } |
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141 | delete rangeVector; |
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142 | } |
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143 | |
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144 | return theKineticEnergyCuts; |
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145 | } |
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146 | |
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147 | // ********************************************************************** |
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148 | // ************************ SetEnergyRange ***************************** |
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149 | // ********************************************************************** |
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150 | void G4VRangeToEnergyConverter::SetEnergyRange(G4double lowedge, |
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151 | G4double highedge) |
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152 | { |
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153 | // check LowestEnergy/ HighestEnergy |
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154 | if ( (lowedge<0.0)||(highedge<=lowedge) ){ |
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155 | G4cerr << "Error in G4VRangeToEnergyConverter::SetEnergyRange"; |
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156 | G4cerr << " : illegal energy range" << "(" << lowedge/GeV; |
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157 | G4cerr << "," << highedge/GeV << ") [GeV]" << G4endl; |
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158 | } else { |
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159 | LowestEnergy = lowedge; |
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160 | HighestEnergy = highedge; |
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161 | } |
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162 | } |
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163 | |
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164 | |
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165 | G4double G4VRangeToEnergyConverter::GetLowEdgeEnergy() |
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166 | { |
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167 | return LowestEnergy; |
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168 | } |
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169 | |
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170 | |
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171 | G4double G4VRangeToEnergyConverter::GetHighEdgeEnergy() |
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172 | { |
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173 | return HighestEnergy; |
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174 | } |
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175 | |
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176 | // ********************************************************************** |
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177 | // ************************ RangeLinSimpson ***************************** |
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178 | // ********************************************************************** |
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179 | G4double G4VRangeToEnergyConverter::RangeLinSimpson( |
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180 | G4int numberOfElement, |
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181 | const G4ElementVector* elementVector, |
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182 | const G4double* atomicNumDensityVector, |
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183 | G4double aMass, |
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184 | G4double taulow, G4double tauhigh, G4int nbin) |
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185 | { |
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186 | // Simpson numerical integration, linear binning |
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187 | G4double dtau = (tauhigh-taulow)/nbin; |
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188 | G4double Value=0.; |
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189 | for (size_t i=0; i<=size_t(nbin); i++){ |
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190 | G4double taui=taulow+dtau*i; |
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191 | G4double ti=aMass*taui; |
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192 | G4double lossi=0.; |
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193 | size_t nEl = (size_t)(numberOfElement); |
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194 | for (size_t j=0; j<nEl; j++) { |
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195 | G4bool isOut; |
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196 | G4int IndEl = (*elementVector)[j]->GetIndex(); |
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197 | lossi += atomicNumDensityVector[j]* |
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198 | (*theLossTable)[IndEl]->GetValue(ti,isOut); |
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199 | } |
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200 | if ( i==0 ) { |
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201 | Value += 0.5/lossi; |
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202 | } else { |
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203 | if ( i<size_t(nbin) ) Value += 1./lossi; |
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204 | else Value += 0.5/lossi; |
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205 | } |
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206 | } |
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207 | Value *= aMass*dtau; |
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208 | |
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209 | return Value; |
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210 | } |
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211 | |
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212 | |
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213 | // ********************************************************************** |
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214 | // ************************ RangeLogSimpson ***************************** |
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215 | // ********************************************************************** |
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216 | G4double G4VRangeToEnergyConverter::RangeLogSimpson( |
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217 | G4int numberOfElement, |
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218 | const G4ElementVector* elementVector, |
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219 | const G4double* atomicNumDensityVector, |
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220 | G4double aMass, |
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221 | G4double ltaulow, G4double ltauhigh, |
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222 | G4int nbin) |
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223 | { |
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224 | // Simpson numerical integration, logarithmic binning |
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225 | if(nbin<0) nbin = TotBin; |
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226 | G4double ltt = ltauhigh-ltaulow; |
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227 | G4double dltau = ltt/nbin; |
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228 | G4double Value = 0.; |
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229 | for (size_t i=0; i<=size_t(nbin); i++){ |
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230 | G4double ui = ltaulow+dltau*i; |
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231 | G4double taui = std::exp(ui); |
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232 | G4double ti = aMass*taui; |
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233 | G4double lossi = 0.; |
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234 | size_t nEl = (size_t)(numberOfElement); |
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235 | |
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236 | for (size_t j=0; j<nEl; j++) { |
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237 | G4bool isOut; |
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238 | G4int IndEl = (*elementVector)[j]->GetIndex(); |
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239 | lossi += atomicNumDensityVector[j]* |
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240 | (*theLossTable)[IndEl]->GetValue(ti,isOut); |
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241 | } |
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242 | if ( i==0 ) { |
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243 | Value += 0.5*taui/lossi; |
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244 | } else { |
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245 | if ( i<size_t(nbin) ) Value += taui/lossi; |
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246 | else Value += 0.5*taui/lossi; |
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247 | } |
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248 | } |
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249 | Value *= aMass*dltau; |
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250 | |
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251 | return Value; |
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252 | } |
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253 | |
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254 | // ********************************************************************** |
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255 | // ************************ BuildLossTable ****************************** |
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256 | // ********************************************************************** |
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257 | // create Energy Loss Table for charged particles |
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258 | // (cross section tabel for neutral ) |
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259 | void G4VRangeToEnergyConverter::BuildLossTable() |
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260 | { |
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261 | // Build dE/dx tables for elements |
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262 | if (size_t(NumberOfElements) != G4Element::GetNumberOfElements()) { |
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263 | if (theLossTable!=0) { |
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264 | theLossTable->clearAndDestroy(); |
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265 | delete theLossTable; |
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266 | } |
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267 | theLossTable =0; |
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268 | NumberOfElements = 0; |
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269 | } |
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270 | |
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271 | if (NumberOfElements ==0) { |
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272 | NumberOfElements = G4Element::GetNumberOfElements(); |
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273 | theLossTable = new G4LossTable(); |
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274 | theLossTable->reserve(G4Element::GetNumberOfElements()); |
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275 | #ifdef G4VERBOSE |
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276 | if (GetVerboseLevel()>2) { |
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277 | G4cout << "G4VRangeToEnergyConverter::BuildLossTable() "; |
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278 | G4cout << "Create theLossTable[" << theLossTable << "]"; |
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279 | G4cout << " NumberOfElements=" << NumberOfElements <<G4endl; |
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280 | } |
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281 | #endif |
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282 | |
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283 | |
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284 | // fill the loss table |
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285 | for (size_t j=0; j<size_t(NumberOfElements); j++){ |
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286 | G4double Value; |
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287 | G4LossVector* aVector= new |
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288 | G4LossVector(LowestEnergy, HighestEnergy, TotBin); |
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289 | for (size_t i=0; i<size_t(TotBin); i++) { |
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290 | Value = ComputeLoss( (*G4Element::GetElementTable())[j]->GetZ(), |
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291 | aVector->GetLowEdgeEnergy(i) |
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292 | ); |
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293 | aVector->PutValue(i,Value); |
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294 | } |
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295 | theLossTable->insert(aVector); |
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296 | } |
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297 | } |
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298 | } |
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299 | |
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300 | // ********************************************************************** |
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301 | // ************************** ComputeLoss ******************************* |
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302 | // ********************************************************************** |
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303 | G4double G4VRangeToEnergyConverter::ComputeLoss(G4double AtomicNumber, |
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304 | G4double KineticEnergy) const |
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305 | { |
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306 | // calculate dE/dx |
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307 | |
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308 | static G4double Z; |
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309 | static G4double ionpot, tau0, taum, taul, ca, cba, cc; |
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310 | |
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311 | G4double z2Particle = theParticle->GetPDGCharge()/eplus; |
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312 | z2Particle *= z2Particle; |
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313 | if (z2Particle < 0.1) return 0.0; |
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314 | |
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315 | if( std::abs(AtomicNumber-Z)>0.1 ){ |
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316 | // recalculate constants |
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317 | Z = AtomicNumber; |
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318 | G4double Z13 = std::exp(std::log(Z)/3.); |
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319 | tau0 = 0.1*Z13*MeV/proton_mass_c2; |
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320 | taum = 0.035*Z13*MeV/proton_mass_c2; |
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321 | taul = 2.*MeV/proton_mass_c2; |
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322 | ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z)); |
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323 | cc = (taul+1.)*(taul+1.)*std::log(2.*electron_mass_c2*taul*(taul+2.)/ionpot)/(taul*(taul+2.))-1.; |
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324 | cc = 2.*twopi_mc2_rcl2*Z*cc*std::sqrt(taul); |
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325 | ca = cc/((1.-0.5*std::sqrt(tau0/taum))*tau0); |
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326 | cba = -0.5/std::sqrt(taum); |
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327 | } |
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328 | |
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329 | G4double tau = KineticEnergy/theParticle->GetPDGMass(); |
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330 | G4double dEdx; |
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331 | if ( tau <= tau0 ) { |
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332 | dEdx = ca*(std::sqrt(tau)+cba*tau); |
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333 | } else { |
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334 | if( tau <= taul ) { |
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335 | dEdx = cc/std::sqrt(tau); |
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336 | } else { |
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337 | dEdx = (tau+1.)*(tau+1.)* |
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338 | std::log(2.*electron_mass_c2*tau*(tau+2.)/ionpot)/(tau*(tau+2.))-1.; |
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339 | dEdx = 2.*twopi_mc2_rcl2*Z*dEdx; |
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340 | } |
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341 | } |
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342 | return dEdx*z2Particle ; |
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343 | } |
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344 | |
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345 | // ********************************************************************** |
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346 | // ************************ BuildRangeVector **************************** |
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347 | // ********************************************************************** |
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348 | void G4VRangeToEnergyConverter::BuildRangeVector( |
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349 | const G4Material* aMaterial, |
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350 | G4double maxEnergy, |
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351 | G4double aMass, |
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352 | G4RangeVector* rangeVector) |
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353 | { |
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354 | // create range vector for a material |
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355 | const G4double tlim=2.*MeV, t1=0.1*MeV, t2=0.025*MeV; |
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356 | const G4int maxnbint=100; |
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357 | |
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358 | const G4ElementVector* elementVector = aMaterial->GetElementVector(); |
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359 | const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector(); |
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360 | |
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361 | G4int NumEl = aMaterial->GetNumberOfElements(); |
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362 | |
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363 | // calculate parameters of the low energy part first |
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364 | G4double loss1=0.; |
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365 | G4double loss2=0.; |
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366 | size_t i; |
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367 | for (i=0; i<size_t(NumEl); i++) { |
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368 | G4bool isOut; |
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369 | G4int IndEl = (*elementVector)[i]->GetIndex(); |
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370 | loss1 += atomicNumDensityVector[i]* |
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371 | (*theLossTable)[IndEl]->GetValue(t1,isOut); |
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372 | loss2 += atomicNumDensityVector[i]* |
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373 | (*theLossTable)[IndEl]->GetValue(t2,isOut); |
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374 | } |
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375 | G4double tau1 = t1/proton_mass_c2; |
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376 | G4double sqtau1 = std::sqrt(tau1); |
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377 | G4double ca = (4.*loss2-loss1)/sqtau1; |
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378 | G4double cb = (2.*loss1-4.*loss2)/tau1; |
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379 | G4double cba = cb/ca; |
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380 | G4double taulim = tlim/proton_mass_c2; |
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381 | G4double taumax = maxEnergy/aMass; |
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382 | G4double ltaumax = std::log(taumax); |
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383 | |
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384 | // now we can fill the range vector.... |
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385 | G4double rmax = 0.0; |
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386 | for (i=0; i<size_t(TotBin); i++) { |
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387 | G4double LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(i); |
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388 | G4double tau = LowEdgeEnergy/aMass; |
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389 | G4double Value; |
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390 | |
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391 | if ( tau <= tau1 ){ |
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392 | Value =2.*aMass*std::log(1.+cba*std::sqrt(tau))/cb; |
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393 | } else { |
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394 | Value = 2.*aMass*std::log(1.+cba*sqtau1)/cb; |
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395 | if ( tau <= taulim ) { |
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396 | G4int nbin = (G4int)(maxnbint*(tau-tau1)/(taulim-tau1)); |
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397 | if ( nbin<1 ) nbin = 1; |
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398 | Value += RangeLinSimpson( NumEl, elementVector, |
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399 | atomicNumDensityVector, aMass, |
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400 | tau1, tau, nbin); |
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401 | } else { |
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402 | Value += RangeLinSimpson( NumEl, elementVector, |
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403 | atomicNumDensityVector, aMass, |
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404 | tau1, taulim, maxnbint); |
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405 | G4double ltaulow = std::log(taulim); |
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406 | G4double ltauhigh = std::log(tau); |
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407 | G4int nbin = (G4int)(maxnbint*(ltauhigh-ltaulow)/(ltaumax-ltaulow)); |
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408 | if ( nbin<1 ) nbin = 1; |
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409 | Value += RangeLogSimpson(NumEl, elementVector, |
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410 | atomicNumDensityVector, aMass, |
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411 | ltaulow, ltauhigh, nbin); |
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412 | } |
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413 | } |
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414 | rangeVector->PutValue(i,Value); |
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415 | if (rmax < Value) rmax = Value; |
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416 | } |
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417 | } |
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418 | |
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419 | // ********************************************************************** |
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420 | // ****************** ConvertCutToKineticEnergy ************************* |
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421 | // ********************************************************************** |
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422 | G4double G4VRangeToEnergyConverter::ConvertCutToKineticEnergy( |
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423 | G4RangeVector* rangeVector, |
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424 | G4double theCutInLength, |
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425 | size_t materialIndex |
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426 | ) const |
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427 | { |
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428 | const G4double epsilon=0.01; |
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429 | |
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430 | // find max. range and the corresponding energy (rmax,Tmax) |
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431 | G4double rmax= -1.e10*mm; |
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432 | G4double Tmax= HighestEnergy; |
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433 | G4double fac = std::exp( std::log(HighestEnergy/LowestEnergy)/TotBin ); |
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434 | G4double T=LowestEnergy/fac; |
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435 | G4bool isOut; |
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436 | |
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437 | for (size_t ibin=0; ibin<size_t(TotBin); ibin++) { |
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438 | T *= fac; |
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439 | G4double r=rangeVector->GetValue(T,isOut); |
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440 | if ( r>rmax ) { |
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441 | Tmax=T; |
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442 | rmax=r; |
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443 | } |
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444 | } |
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445 | |
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446 | // check cut in length is smaller than range max |
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447 | if ( theCutInLength >= rmax ) { |
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448 | #ifdef G4VERBOSE |
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449 | if (GetVerboseLevel()>0) { |
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450 | G4cout << "G4VRangeToEnergyConverter::ConvertCutToKineticEnergy "; |
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451 | G4cout << " for " << theParticle->GetParticleName() << G4endl; |
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452 | G4cout << "The cut in range [" << theCutInLength/mm << " (mm)] "; |
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453 | G4cout << " is too big " ; |
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454 | G4cout << " for material idx=" << materialIndex <<G4endl; |
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455 | G4cout << "The cut in energy is set" << DBL_MAX/GeV << "GeV " <<G4endl; |
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456 | } |
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457 | #endif |
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458 | return DBL_MAX; |
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459 | } |
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460 | |
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461 | // convert range to energy |
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462 | G4double T1 = LowestEnergy; |
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463 | G4double r1 = rangeVector->GetValue(T1,isOut); |
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464 | if ( theCutInLength <= r1 ) |
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465 | { |
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466 | return T1; |
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467 | } |
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468 | |
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469 | G4double T2 = Tmax ; |
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470 | G4double T3 = std::sqrt(T1*T2); |
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471 | G4double r3 = rangeVector->GetValue(T3,isOut); |
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472 | while ( std::abs(1.-r3/theCutInLength)>epsilon ) { |
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473 | if ( theCutInLength <= r3 ) { |
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474 | T2 = T3; |
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475 | } else { |
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476 | T1 = T3; |
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477 | } |
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478 | T3 = std::sqrt(T1*T2); |
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479 | r3 = rangeVector->GetValue(T3,isOut); |
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480 | } |
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481 | |
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482 | return T3; |
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483 | } |
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484 | |
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