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: G4EmSaturation.cc,v 1.11 2010/10/25 17:23:01 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: emutils-V09-03-23 $ |
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28 | // |
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29 | // ------------------------------------------------------------------- |
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30 | // |
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31 | // GEANT4 Class file |
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32 | // |
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33 | // |
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34 | // File name: G4EmSaturation |
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35 | // |
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36 | // Author: Vladimir Ivanchenko |
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37 | // |
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38 | // Creation date: 18.02.2008 |
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39 | // |
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40 | // Modifications: |
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41 | // |
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42 | // ------------------------------------------------------------- |
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43 | |
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44 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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45 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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46 | |
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47 | #include "G4EmSaturation.hh" |
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48 | #include "G4LossTableManager.hh" |
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49 | #include "G4NistManager.hh" |
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50 | #include "G4Material.hh" |
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51 | #include "G4MaterialCutsCouple.hh" |
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52 | #include "G4Electron.hh" |
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53 | #include "G4Proton.hh" |
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54 | |
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55 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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56 | |
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57 | G4EmSaturation::G4EmSaturation() |
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58 | { |
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59 | verbose = 1; |
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60 | manager = 0; |
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61 | |
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62 | curMaterial = 0; |
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63 | curBirks = 0.0; |
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64 | curRatio = 1.0; |
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65 | curChargeSq = 1.0; |
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66 | nMaterials = 0; |
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67 | |
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68 | electron = 0; |
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69 | proton = 0; |
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70 | nist = G4NistManager::Instance(); |
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71 | |
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72 | Initialise(); |
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73 | } |
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74 | |
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75 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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76 | |
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77 | G4EmSaturation::~G4EmSaturation() |
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78 | {} |
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79 | |
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80 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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81 | |
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82 | G4double G4EmSaturation::VisibleEnergyDeposition( |
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83 | const G4ParticleDefinition* p, |
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84 | const G4MaterialCutsCouple* couple, |
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85 | G4double length, |
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86 | G4double edep, |
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87 | G4double niel) |
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88 | { |
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89 | if(edep <= 0.0) { return 0.0; } |
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90 | |
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91 | G4double evis = edep; |
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92 | G4double bfactor = FindBirksCoefficient(couple->GetMaterial()); |
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93 | |
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94 | if(bfactor > 0.0) { |
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95 | |
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96 | G4int pdgCode = p->GetPDGEncoding(); |
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97 | // atomic relaxations for gamma incident |
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98 | if(22 == pdgCode) { |
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99 | evis /= (1.0 + bfactor*edep/manager->GetRange(electron,edep,couple)); |
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100 | |
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101 | // energy loss |
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102 | } else { |
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103 | |
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104 | // protections |
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105 | G4double nloss = niel; |
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106 | if(nloss < 0.0) nloss = 0.0; |
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107 | G4double eloss = edep - nloss; |
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108 | |
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109 | // neutrons |
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110 | if(2112 == pdgCode || eloss < 0.0 || length <= 0.0) { |
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111 | nloss = edep; |
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112 | eloss = 0.0; |
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113 | } |
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114 | |
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115 | // continues energy loss |
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116 | if(eloss > 0.0) { eloss /= (1.0 + bfactor*eloss/length); } |
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117 | |
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118 | // non-ionizing energy loss |
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119 | if(nloss > 0.0) { |
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120 | if(!proton) { proton = G4Proton::Proton(); } |
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121 | G4double escaled = nloss*curRatio; |
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122 | G4double s = manager->GetRange(proton,escaled,couple)/curChargeSq; |
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123 | nloss /= (1.0 + bfactor*nloss/s); |
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124 | } |
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125 | |
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126 | evis = eloss + nloss; |
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127 | } |
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128 | } |
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129 | |
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130 | return evis; |
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131 | } |
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132 | |
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133 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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134 | |
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135 | G4double G4EmSaturation::FindG4BirksCoefficient(const G4Material* mat) |
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136 | { |
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137 | G4String name = mat->GetName(); |
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138 | // is this material in the vector? |
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139 | |
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140 | for(G4int j=0; j<nG4Birks; ++j) { |
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141 | if(name == g4MatNames[j]) { |
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142 | if(verbose > 0) |
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143 | G4cout << "### G4EmSaturation::FindG4BirksCoefficient for " |
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144 | << name << " is " << g4MatData[j]*MeV/mm << " mm/MeV " |
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145 | << G4endl; |
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146 | return g4MatData[j]; |
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147 | } |
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148 | } |
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149 | return FindBirksCoefficient(mat); |
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150 | } |
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151 | |
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152 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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153 | |
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154 | G4double G4EmSaturation::FindBirksCoefficient(const G4Material* mat) |
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155 | { |
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156 | // electron should exist in any case |
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157 | if(!manager) { |
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158 | manager = G4LossTableManager::Instance(); |
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159 | electron= G4Electron::Electron(); |
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160 | } |
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161 | |
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162 | if(mat == curMaterial) { return curBirks; } |
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163 | |
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164 | curMaterial = mat; |
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165 | curBirks = 0.0; |
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166 | curRatio = 1.0; |
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167 | curChargeSq = 1.0; |
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168 | |
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169 | // seach in the run-time list |
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170 | for(G4int i=0; i<nMaterials; ++i) { |
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171 | if(mat == matPointers[i]) { |
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172 | curBirks = mat->GetIonisation()->GetBirksConstant(); |
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173 | curRatio = massFactors[i]; |
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174 | curChargeSq = effCharges[i]; |
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175 | return curBirks; |
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176 | } |
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177 | } |
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178 | |
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179 | G4String name = mat->GetName(); |
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180 | curBirks = mat->GetIonisation()->GetBirksConstant(); |
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181 | |
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182 | // material has no Birks coeffitient defined |
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183 | // seach in the Geant4 list |
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184 | if(curBirks == 0.0) { |
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185 | for(G4int j=0; j<nG4Birks; ++j) { |
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186 | if(name == g4MatNames[j]) { |
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187 | mat->GetIonisation()->SetBirksConstant(g4MatData[j]); |
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188 | curBirks = g4MatData[j]; |
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189 | break; |
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190 | } |
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191 | } |
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192 | } |
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193 | |
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194 | if(curBirks == 0.0 && verbose > 0) { |
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195 | G4cout << "### G4EmSaturation::FindBirksCoefficient fails " |
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196 | " for material " << name << G4endl; |
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197 | } |
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198 | |
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199 | // compute mean mass ratio |
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200 | curRatio = 0.0; |
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201 | curChargeSq = 0.0; |
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202 | G4double norm = 0.0; |
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203 | const G4ElementVector* theElementVector = mat->GetElementVector(); |
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204 | const G4double* theAtomNumDensityVector = mat->GetVecNbOfAtomsPerVolume(); |
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205 | size_t nelm = mat->GetNumberOfElements(); |
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206 | for (size_t i=0; i<nelm; ++i) { |
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207 | const G4Element* elm = (*theElementVector)[i]; |
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208 | G4double Z = elm->GetZ(); |
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209 | G4double w = Z*Z*theAtomNumDensityVector[i]; |
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210 | curRatio += w/nist->GetAtomicMassAmu(G4int(Z)); |
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211 | curChargeSq = Z*Z*w; |
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212 | norm += w; |
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213 | } |
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214 | curRatio *= proton_mass_c2/norm; |
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215 | curChargeSq /= norm; |
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216 | |
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217 | // store results |
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218 | matPointers.push_back(mat); |
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219 | matNames.push_back(name); |
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220 | massFactors.push_back(curRatio); |
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221 | effCharges.push_back(curChargeSq); |
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222 | nMaterials++; |
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223 | if(curBirks > 0.0 && verbose > 0) { |
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224 | G4cout << "### G4EmSaturation::FindBirksCoefficient Birks coefficient for " |
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225 | << name << " " << curBirks*MeV/mm << " mm/MeV" << G4endl; |
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226 | } |
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227 | return curBirks; |
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228 | } |
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229 | |
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230 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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231 | |
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232 | void G4EmSaturation::DumpBirksCoefficients() |
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233 | { |
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234 | if(nMaterials > 0) { |
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235 | G4cout << "### Birks coeffitients used in run time" << G4endl; |
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236 | for(G4int i=0; i<nMaterials; ++i) { |
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237 | G4double br = matPointers[i]->GetIonisation()->GetBirksConstant(); |
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238 | G4cout << " " << matNames[i] << " " |
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239 | << br*MeV/mm << " mm/MeV" << " " |
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240 | << br*matPointers[i]->GetDensity()*MeV*cm2/g |
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241 | << " g/cm^2/MeV" |
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242 | << G4endl; |
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243 | } |
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244 | } |
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245 | } |
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246 | |
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247 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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248 | |
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249 | void G4EmSaturation::DumpG4BirksCoefficients() |
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250 | { |
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251 | if(nG4Birks > 0) { |
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252 | G4cout << "### Birks coeffitients for Geant4 materials" << G4endl; |
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253 | for(G4int i=0; i<nG4Birks; ++i) { |
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254 | G4cout << " " << g4MatNames[i] << " " |
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255 | << g4MatData[i]*MeV/mm << " mm/MeV" << G4endl; |
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256 | } |
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257 | } |
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258 | } |
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259 | |
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260 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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261 | |
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262 | void G4EmSaturation::Initialise() |
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263 | { |
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264 | // M.Hirschberg et al., IEEE Trans. Nuc. Sci. 39 (1992) 511 |
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265 | // SCSN-38 kB = 0.00842 g/cm^2/MeV; rho = 1.06 g/cm^3 |
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266 | g4MatNames.push_back("G4_POLYSTYRENE"); |
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267 | g4MatData.push_back(0.07943*mm/MeV); |
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268 | |
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269 | // C.Fabjan (private communication) |
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270 | // kB = 0.006 g/cm^2/MeV; rho = 7.13 g/cm^3 |
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271 | g4MatNames.push_back("G4_BGO"); |
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272 | g4MatData.push_back(0.008415*mm/MeV); |
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273 | |
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274 | // A.Ribon analysis of publications |
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275 | // Scallettar et al., Phys. Rev. A25 (1982) 2419. |
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276 | // NIM A 523 (2004) 275. |
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277 | // kB = 0.022 g/cm^2/MeV; rho = 1.396 g/cm^3; |
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278 | // ATLAS Efield = 10 kV/cm provide the strongest effect |
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279 | g4MatNames.push_back("G4_lAr"); |
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280 | g4MatData.push_back(0.1576*mm/MeV); |
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281 | |
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282 | //G4_BARIUM_FLUORIDE |
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283 | //G4_CESIUM_IODIDE |
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284 | //G4_GEL_PHOTO_EMULSION |
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285 | //G4_PHOTO_EMULSION |
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286 | //G4_PLASTIC_SC_VINYLTOLUENE |
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287 | //G4_SODIUM_IODIDE |
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288 | //G4_STILBENE |
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289 | //G4_lAr |
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290 | //G4_PbWO4 |
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291 | //G4_Lucite |
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292 | |
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293 | nG4Birks = g4MatData.size(); |
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294 | } |
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295 | |
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296 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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