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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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9 | // * include a list of copyright holders. * |
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13 | // * work make any representation or warranty, express or implied, * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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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: G4ionGasIonisation.cc,v 1.4 2008/01/14 11:59:45 vnivanch Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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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: G4ionGasIonisation |
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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: 23.07.2007 |
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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 | // |
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45 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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46 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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47 | |
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48 | #include "G4ionGasIonisation.hh" |
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49 | #include "G4Electron.hh" |
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50 | #include "G4Proton.hh" |
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51 | #include "G4GenericIon.hh" |
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52 | |
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53 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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54 | |
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55 | using namespace std; |
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56 | |
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57 | G4ionGasIonisation::G4ionGasIonisation(const G4String& name) |
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58 | : G4ionIonisation(name), |
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59 | currParticle(0), |
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60 | baseParticle(0), |
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61 | initialised(false) |
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62 | { |
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63 | atomXS = CLHEP::pi*CLHEP::Bohr_radius*CLHEP::Bohr_radius; |
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64 | verboseLevel = 1; |
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65 | } |
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66 | |
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67 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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68 | |
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69 | G4ionGasIonisation::~G4ionGasIonisation() |
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70 | {} |
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71 | |
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72 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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73 | |
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74 | void G4ionGasIonisation::InitialiseEnergyLossProcess( |
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75 | const G4ParticleDefinition* part, |
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76 | const G4ParticleDefinition* bpart) |
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77 | { |
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78 | G4ionIonisation::InitialiseEnergyLossProcess(part, bpart); |
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79 | if(initialised) return; |
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80 | |
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81 | currParticle = part; |
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82 | |
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83 | if(part == bpart || part == G4GenericIon::GenericIon()) baseParticle = 0; |
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84 | else if(bpart == 0) baseParticle = G4GenericIon::GenericIon(); |
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85 | else baseParticle = bpart; |
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86 | |
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87 | if(baseParticle) basePartMass = baseParticle->GetPDGMass(); |
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88 | else basePartMass = currParticle->GetPDGMass(); |
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89 | |
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90 | initialised = true; |
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91 | } |
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92 | |
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93 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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94 | |
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95 | void G4ionGasIonisation::PrintInfo() |
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96 | { |
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97 | G4ionIonisation::PrintInfo(); |
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98 | G4cout << " Version of ion process with simulation discrete ion/media change exchange." |
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99 | << G4endl; |
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100 | } |
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101 | |
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102 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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103 | |
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104 | void G4ionGasIonisation::InitialiseMassCharge(const G4Track& track) |
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105 | { |
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106 | // First step of an ion |
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107 | if(track.GetCurrentStepNumber() == 1) { |
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108 | currParticle = track.GetDefinition(); |
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109 | ionZ = G4int(currParticle->GetPDGCharge()/eplus + 0.5); |
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110 | currentIonZ = G4int(track.GetDynamicParticle()->GetCharge()/eplus + 0.5); |
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111 | currMassRatio = basePartMass/currParticle->GetPDGMass(); |
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112 | } |
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113 | // any step |
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114 | G4double q = eplus*currentIonZ; |
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115 | SetDynamicMassCharge(currMassRatio, q*q); |
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116 | preStepKinEnergy = track.GetKineticEnergy(); |
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117 | } |
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118 | |
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119 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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120 | |
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121 | void G4ionGasIonisation::CorrectionsAlongStep(const G4MaterialCutsCouple* couple, |
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122 | const G4DynamicParticle* dp, |
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123 | G4double& eloss, |
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124 | G4double& s) |
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125 | { |
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126 | const G4ParticleDefinition* part = dp->GetDefinition(); |
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127 | const G4Material* mat = couple->GetMaterial(); |
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128 | // add corrections |
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129 | if(eloss < preStepKinEnergy) { |
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130 | |
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131 | // use Bethe-Bloch with corrections |
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132 | if(preStepKinEnergy*currMassRatio > BetheBlochEnergyThreshold()) |
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133 | eloss += s*corr->HighOrderCorrections(part,mat,preStepKinEnergy); |
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134 | |
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135 | // effective number of collisions |
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136 | G4double x = mat->GetElectronDensity()*s*atomXS; |
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137 | // equilibrium charge |
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138 | G4double q = fParticleChange.GetProposedCharge(); |
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139 | |
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140 | // sample charge change during the step |
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141 | fParticleChange.SetProposedCharge(SampleChargeAfterStep(q, x)); |
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142 | } |
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143 | |
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144 | // use nuclear stopping |
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145 | if(NuclearStoppingFlag()) { |
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146 | G4double nloss = s*corr->NuclearDEDX(part,mat,preStepKinEnergy - eloss*0.5); |
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147 | eloss += nloss; |
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148 | fParticleChange.ProposeNonIonizingEnergyDeposit(nloss); |
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149 | } |
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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 G4ionGasIonisation::SampleChargeAfterStep(G4double qeff, G4double xeff) |
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155 | { |
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156 | // qeff - equilibrium charge |
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157 | // xeff - effective number of collisions |
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158 | // q - current charge |
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159 | G4double q = eplus*currentIonZ; |
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160 | if(verboseLevel > 1) G4cout << "G4ionGasIonisation: Q1= " << currentIonZ |
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161 | << " Qeff= " << qeff/eplus << " Neff= " << xeff |
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162 | << G4endl; |
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163 | return q; |
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164 | } |
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165 | |
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166 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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