1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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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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18 | // * This code implementation is the result of the scientific and * |
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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: G4AdjointhIonisationModel.cc,v 1.3 2009/12/16 17:50:07 gunter Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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28 | // |
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29 | #include "G4AdjointhIonisationModel.hh" |
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30 | #include "G4AdjointCSManager.hh" |
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31 | #include "G4Integrator.hh" |
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32 | #include "G4TrackStatus.hh" |
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33 | #include "G4ParticleChange.hh" |
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34 | #include "G4AdjointElectron.hh" |
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35 | #include "G4AdjointProton.hh" |
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36 | #include "G4AdjointInterpolator.hh" |
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37 | #include "G4BetheBlochModel.hh" |
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38 | #include "G4BraggModel.hh" |
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39 | #include "G4Proton.hh" |
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40 | #include "G4NistManager.hh" |
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41 | |
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42 | //////////////////////////////////////////////////////////////////////////////// |
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43 | // |
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44 | G4AdjointhIonisationModel::G4AdjointhIonisationModel(G4ParticleDefinition* projectileDefinition): |
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45 | G4VEmAdjointModel("Adjoint_hIonisation") |
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46 | { |
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47 | |
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48 | |
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49 | |
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50 | UseMatrix =true; |
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51 | UseMatrixPerElement = true; |
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52 | ApplyCutInRange = true; |
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53 | UseOnlyOneMatrixForAllElements = true; |
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54 | CS_biasing_factor =1.; |
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55 | second_part_of_same_type =false; |
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56 | |
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57 | //The direct EM Modfel is taken has BetheBloch it is only used for the computation |
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58 | // of the differential cross section. |
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59 | //The Bragg model could be used as an alternative as it offers the same differential cross section |
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60 | |
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61 | theDirectEMModel = new G4BetheBlochModel(projectileDefinition); |
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62 | theBraggDirectEMModel = new G4BraggModel(projectileDefinition); |
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63 | theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron(); |
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64 | |
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65 | theDirectPrimaryPartDef = projectileDefinition; |
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66 | if (projectileDefinition == G4Proton::Proton()) { |
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67 | theAdjEquivOfDirectPrimPartDef = G4AdjointProton::AdjointProton(); |
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68 | |
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69 | } |
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70 | |
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71 | DefineProjectileProperty(); |
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72 | |
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73 | |
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74 | |
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75 | |
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76 | |
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77 | |
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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 | // |
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83 | G4AdjointhIonisationModel::~G4AdjointhIonisationModel() |
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84 | {;} |
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85 | |
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86 | |
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87 | //////////////////////////////////////////////////////////////////////////////// |
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88 | // |
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89 | void G4AdjointhIonisationModel::SampleSecondaries(const G4Track& aTrack, |
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90 | G4bool IsScatProjToProjCase, |
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91 | G4ParticleChange* fParticleChange) |
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92 | { |
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93 | if (!UseMatrix) return RapidSampleSecondaries(aTrack,IsScatProjToProjCase,fParticleChange); |
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94 | |
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95 | const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle(); |
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96 | |
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97 | //Elastic inverse scattering |
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98 | //--------------------------------------------------------- |
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99 | G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy(); |
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100 | G4double adjointPrimP =theAdjointPrimary->GetTotalMomentum(); |
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101 | |
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102 | if (adjointPrimKinEnergy>HighEnergyLimit*0.999){ |
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103 | return; |
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104 | } |
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105 | |
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106 | //Sample secondary energy |
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107 | //----------------------- |
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108 | G4double projectileKinEnergy = SampleAdjSecEnergyFromCSMatrix(adjointPrimKinEnergy, IsScatProjToProjCase); |
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109 | CorrectPostStepWeight(fParticleChange, |
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110 | aTrack.GetWeight(), |
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111 | adjointPrimKinEnergy, |
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112 | projectileKinEnergy, |
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113 | IsScatProjToProjCase); //Caution !!!this weight correction should be always applied |
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114 | |
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115 | |
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116 | //Kinematic: |
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117 | //we consider a two body elastic scattering for the forward processes where the projectile knock on an e- at rest and gives |
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118 | // him part of its energy |
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119 | //---------------------------------------------------------------------------------------- |
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120 | |
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121 | G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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122 | G4double projectileTotalEnergy = projectileM0+projectileKinEnergy; |
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123 | G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0; |
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124 | |
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125 | |
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126 | |
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127 | //Companion |
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128 | //----------- |
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129 | G4double companionM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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130 | if (IsScatProjToProjCase) { |
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131 | companionM0=theAdjEquivOfDirectSecondPartDef->GetPDGMass(); |
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132 | } |
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133 | G4double companionTotalEnergy =companionM0+ projectileKinEnergy-adjointPrimKinEnergy; |
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134 | G4double companionP2 = companionTotalEnergy*companionTotalEnergy - companionM0*companionM0; |
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135 | |
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136 | |
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137 | //Projectile momentum |
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138 | //-------------------- |
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139 | G4double P_parallel = (adjointPrimP*adjointPrimP + projectileP2 - companionP2)/(2.*adjointPrimP); |
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140 | G4double P_perp = std::sqrt( projectileP2 - P_parallel*P_parallel); |
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141 | G4ThreeVector dir_parallel=theAdjointPrimary->GetMomentumDirection(); |
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142 | G4double phi =G4UniformRand()*2.*3.1415926; |
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143 | G4ThreeVector projectileMomentum = G4ThreeVector(P_perp*std::cos(phi),P_perp*std::sin(phi),P_parallel); |
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144 | projectileMomentum.rotateUz(dir_parallel); |
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145 | |
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146 | |
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147 | |
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148 | if (!IsScatProjToProjCase ){ //kill the primary and add a secondary |
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149 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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150 | fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum)); |
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151 | //G4cout<<"projectileMomentum "<<projectileMomentum<<G4endl; |
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152 | } |
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153 | else { |
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154 | fParticleChange->ProposeEnergy(projectileKinEnergy); |
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155 | fParticleChange->ProposeMomentumDirection(projectileMomentum.unit()); |
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156 | } |
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157 | |
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158 | |
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159 | |
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160 | |
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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 | void G4AdjointhIonisationModel::RapidSampleSecondaries(const G4Track& aTrack, |
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166 | G4bool IsScatProjToProjCase, |
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167 | G4ParticleChange* fParticleChange) |
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168 | { |
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169 | |
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170 | const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle(); |
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171 | DefineCurrentMaterial(aTrack.GetMaterialCutsCouple()); |
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172 | |
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173 | |
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174 | G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy(); |
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175 | G4double adjointPrimP =theAdjointPrimary->GetTotalMomentum(); |
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176 | |
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177 | if (adjointPrimKinEnergy>HighEnergyLimit*0.999){ |
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178 | return; |
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179 | } |
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180 | |
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181 | G4double projectileKinEnergy =0.; |
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182 | G4double eEnergy=0.; |
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183 | G4double newCS=currentMaterial->GetElectronDensity()*twopi_mc2_rcl2*mass; |
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184 | if (!IsScatProjToProjCase){//1/E^2 distribution |
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185 | |
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186 | eEnergy=adjointPrimKinEnergy; |
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187 | G4double Emax = GetSecondAdjEnergyMaxForProdToProjCase(adjointPrimKinEnergy); |
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188 | G4double Emin= GetSecondAdjEnergyMinForProdToProjCase(adjointPrimKinEnergy); |
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189 | if (Emin>=Emax) return; |
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190 | G4double a=1./Emax; |
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191 | G4double b=1./Emin; |
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192 | newCS=newCS*(b-a)/eEnergy; |
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193 | |
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194 | projectileKinEnergy =1./(b- (b-a)*G4UniformRand()); |
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195 | |
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196 | |
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197 | } |
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198 | else { G4double Emax = GetSecondAdjEnergyMaxForScatProjToProjCase(adjointPrimKinEnergy); |
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199 | G4double Emin = GetSecondAdjEnergyMinForScatProjToProjCase(adjointPrimKinEnergy,currentTcutForDirectSecond); |
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200 | if (Emin>=Emax) return; |
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201 | G4double diff1=Emin-adjointPrimKinEnergy; |
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202 | G4double diff2=Emax-adjointPrimKinEnergy; |
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203 | |
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204 | G4double t1=adjointPrimKinEnergy*(1./diff1-1./diff2); |
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205 | G4double t2=adjointPrimKinEnergy*(1./Emin-1./Emax); |
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206 | G4double f31=diff1/Emin; |
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207 | G4double f32=diff2/Emax/f31; |
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208 | G4double t3=2.*std::log(f32); |
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209 | G4double sum_t=t1+t2+t3; |
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210 | newCS=newCS*sum_t/adjointPrimKinEnergy/adjointPrimKinEnergy; |
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211 | G4double t=G4UniformRand()*sum_t; |
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212 | if (t <=t1 ){ |
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213 | G4double q= G4UniformRand()*t1/adjointPrimKinEnergy ; |
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214 | projectileKinEnergy =adjointPrimKinEnergy +1./(1./diff1-q); |
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215 | |
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216 | } |
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217 | else if (t <=t2 ) { |
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218 | G4double q= G4UniformRand()*t2/adjointPrimKinEnergy; |
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219 | projectileKinEnergy =1./(1./Emin-q); |
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220 | } |
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221 | else { |
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222 | projectileKinEnergy=adjointPrimKinEnergy/(1.-f31*std::pow(f32,G4UniformRand())); |
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223 | |
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224 | } |
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225 | eEnergy=projectileKinEnergy-adjointPrimKinEnergy; |
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226 | |
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227 | |
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228 | } |
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229 | |
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230 | |
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231 | |
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232 | G4double diffCS_perAtom_Used=twopi_mc2_rcl2*mass*adjointPrimKinEnergy/projectileKinEnergy/projectileKinEnergy/eEnergy/eEnergy; |
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233 | |
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234 | |
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235 | |
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236 | //Weight correction |
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237 | //----------------------- |
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238 | //First w_corr is set to the ratio between adjoint total CS and fwd total CS |
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239 | G4double w_corr=G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection(); |
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240 | |
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241 | //G4cout<<w_corr<<G4endl; |
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242 | w_corr*=newCS/lastCS; |
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243 | //G4cout<<w_corr<<G4endl; |
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244 | //Then another correction is needed due to the fact that a biaised differential CS has been used rather than the one consistent with the direct model |
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245 | //Here we consider the true diffCS as the one obtained by the numerical differentiation over Tcut of the direct CS |
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246 | |
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247 | G4double diffCS = DiffCrossSectionPerAtomPrimToSecond(projectileKinEnergy, eEnergy,1,1); |
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248 | w_corr*=diffCS/diffCS_perAtom_Used; |
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249 | //G4cout<<w_corr<<G4endl; |
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250 | |
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251 | G4double new_weight = aTrack.GetWeight()*w_corr; |
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252 | fParticleChange->SetParentWeightByProcess(false); |
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253 | fParticleChange->SetSecondaryWeightByProcess(false); |
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254 | fParticleChange->ProposeParentWeight(new_weight); |
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255 | |
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256 | |
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257 | |
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258 | |
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259 | //Kinematic: |
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260 | //we consider a two body elastic scattering for the forward processes where the projectile knock on an e- at rest and gives |
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261 | // him part of its energy |
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262 | //---------------------------------------------------------------------------------------- |
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263 | |
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264 | G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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265 | G4double projectileTotalEnergy = projectileM0+projectileKinEnergy; |
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266 | G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0; |
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267 | |
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268 | |
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269 | |
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270 | //Companion |
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271 | //----------- |
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272 | G4double companionM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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273 | if (IsScatProjToProjCase) { |
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274 | companionM0=theAdjEquivOfDirectSecondPartDef->GetPDGMass(); |
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275 | } |
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276 | G4double companionTotalEnergy =companionM0+ projectileKinEnergy-adjointPrimKinEnergy; |
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277 | G4double companionP2 = companionTotalEnergy*companionTotalEnergy - companionM0*companionM0; |
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278 | |
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279 | |
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280 | //Projectile momentum |
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281 | //-------------------- |
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282 | G4double P_parallel = (adjointPrimP*adjointPrimP + projectileP2 - companionP2)/(2.*adjointPrimP); |
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283 | G4double P_perp = std::sqrt( projectileP2 - P_parallel*P_parallel); |
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284 | G4ThreeVector dir_parallel=theAdjointPrimary->GetMomentumDirection(); |
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285 | G4double phi =G4UniformRand()*2.*3.1415926; |
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286 | G4ThreeVector projectileMomentum = G4ThreeVector(P_perp*std::cos(phi),P_perp*std::sin(phi),P_parallel); |
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287 | projectileMomentum.rotateUz(dir_parallel); |
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288 | |
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289 | |
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290 | |
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291 | if (!IsScatProjToProjCase ){ //kill the primary and add a secondary |
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292 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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293 | fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum)); |
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294 | //G4cout<<"projectileMomentum "<<projectileMomentum<<G4endl; |
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295 | } |
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296 | else { |
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297 | fParticleChange->ProposeEnergy(projectileKinEnergy); |
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298 | fParticleChange->ProposeMomentumDirection(projectileMomentum.unit()); |
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299 | } |
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300 | |
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301 | |
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302 | |
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303 | |
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304 | |
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305 | |
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306 | |
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307 | } |
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308 | |
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309 | //////////////////////////////////////////////////////////////////////////////// |
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310 | // |
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311 | G4double G4AdjointhIonisationModel::DiffCrossSectionPerAtomPrimToSecond( |
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312 | G4double kinEnergyProj, |
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313 | G4double kinEnergyProd, |
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314 | G4double Z, |
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315 | G4double A) |
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316 | {//Probably that here the Bragg Model should be also used for kinEnergyProj/nuc<2MeV |
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317 | |
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318 | |
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319 | |
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320 | G4double dSigmadEprod=0; |
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321 | G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(kinEnergyProd); |
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322 | G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(kinEnergyProd); |
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323 | |
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324 | |
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325 | if (kinEnergyProj>Emin_proj && kinEnergyProj<=Emax_proj){ //the produced particle should have a kinetic energy smaller than the projectile |
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326 | G4double Tmax=kinEnergyProj; |
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327 | |
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328 | G4double E1=kinEnergyProd; |
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329 | G4double E2=kinEnergyProd*1.000001; |
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330 | G4double dE=(E2-E1); |
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331 | G4double sigma1,sigma2; |
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332 | if (kinEnergyProj >2.*MeV){ |
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333 | sigma1=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E1,1.e20); |
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334 | sigma2=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E2,1.e20); |
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335 | } |
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336 | else { |
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337 | sigma1=theBraggDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E1,1.e20); |
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338 | sigma2=theBraggDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,Z,A ,E2,1.e20); |
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339 | } |
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340 | |
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341 | |
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342 | dSigmadEprod=(sigma1-sigma2)/dE; |
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343 | if (dSigmadEprod>1.) { |
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344 | G4cout<<"sigma1 "<<kinEnergyProj/MeV<<'\t'<<kinEnergyProd/MeV<<'\t'<<sigma1<<G4endl; |
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345 | G4cout<<"sigma2 "<<kinEnergyProj/MeV<<'\t'<<kinEnergyProd/MeV<<'\t'<<sigma2<<G4endl; |
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346 | G4cout<<"dsigma "<<kinEnergyProj/MeV<<'\t'<<kinEnergyProd/MeV<<'\t'<<dSigmadEprod<<G4endl; |
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347 | |
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348 | } |
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349 | |
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350 | |
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351 | |
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352 | //correction of differential cross section at high energy to correct for the suppression of particle at secondary at high |
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353 | //energy used in the Bethe Bloch Model. This correction consist to multiply by g the probability function used |
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354 | //to test the rejection of a secondary |
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355 | //------------------------- |
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356 | |
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357 | //Source code taken from G4BetheBlochModel::SampleSecondaries |
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358 | |
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359 | G4double deltaKinEnergy = kinEnergyProd; |
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360 | |
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361 | //Part of the taken code |
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362 | //---------------------- |
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363 | |
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364 | |
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365 | |
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366 | // projectile formfactor - suppresion of high energy |
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367 | // delta-electron production at high energy |
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368 | G4double x = formfact*deltaKinEnergy; |
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369 | if(x > 1.e-6) { |
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370 | |
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371 | |
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372 | G4double totEnergy = kinEnergyProj + mass; |
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373 | G4double etot2 = totEnergy*totEnergy; |
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374 | G4double beta2 = kinEnergyProj*(kinEnergyProj + 2.0*mass)/etot2; |
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375 | G4double f; |
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376 | G4double f1 = 0.0; |
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377 | f = 1.0 - beta2*deltaKinEnergy/Tmax; |
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378 | if( 0.5 == spin ) { |
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379 | f1 = 0.5*deltaKinEnergy*deltaKinEnergy/etot2; |
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380 | f += f1; |
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381 | } |
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382 | G4double x1 = 1.0 + x; |
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383 | G4double g = 1.0/(x1*x1); |
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384 | if( 0.5 == spin ) { |
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385 | G4double x2 = 0.5*electron_mass_c2*deltaKinEnergy/(mass*mass); |
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386 | g *= (1.0 + magMoment2*(x2 - f1/f)/(1.0 + x2)); |
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387 | } |
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388 | if(g > 1.0) { |
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389 | G4cout << "### G4BetheBlochModel in Adjoint Sim WARNING: g= " << g |
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390 | << G4endl; |
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391 | g=1.; |
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392 | } |
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393 | //G4cout<<"g"<<g<<G4endl; |
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394 | dSigmadEprod*=g; |
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395 | } |
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396 | |
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397 | } |
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398 | |
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399 | return dSigmadEprod; |
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400 | } |
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401 | |
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402 | |
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403 | |
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404 | ////////////////////////////////////////////////////////////////////////////////////////////// |
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405 | // |
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406 | void G4AdjointhIonisationModel::DefineProjectileProperty() |
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407 | { |
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408 | //Slightly modified code taken from G4BetheBlochModel::SetParticle |
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409 | //------------------------------------------------ |
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410 | G4String pname = theDirectPrimaryPartDef->GetParticleName(); |
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411 | if (theDirectPrimaryPartDef->GetParticleType() == "nucleus" && |
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412 | pname != "deuteron" && pname != "triton") { |
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413 | isIon = true; |
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414 | } |
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415 | |
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416 | mass = theDirectPrimaryPartDef->GetPDGMass(); |
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417 | spin = theDirectPrimaryPartDef->GetPDGSpin(); |
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418 | G4double q = theDirectPrimaryPartDef->GetPDGCharge()/eplus; |
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419 | chargeSquare = q*q; |
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420 | ratio = electron_mass_c2/mass; |
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421 | ratio2 = ratio*ratio; |
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422 | one_plus_ratio_2=(1+ratio)*(1+ratio); |
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423 | one_minus_ratio_2=(1-ratio)*(1-ratio); |
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424 | G4double magmom = theDirectPrimaryPartDef->GetPDGMagneticMoment() |
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425 | *mass/(0.5*eplus*hbar_Planck*c_squared); |
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426 | magMoment2 = magmom*magmom - 1.0; |
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427 | formfact = 0.0; |
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428 | if(theDirectPrimaryPartDef->GetLeptonNumber() == 0) { |
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429 | G4double x = 0.8426*GeV; |
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430 | if(spin == 0.0 && mass < GeV) {x = 0.736*GeV;} |
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431 | else if(mass > GeV) { |
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432 | x /= G4NistManager::Instance()->GetZ13(mass/proton_mass_c2); |
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433 | // tlimit = 51.2*GeV*A13[iz]*A13[iz]; |
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434 | } |
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435 | formfact = 2.0*electron_mass_c2/(x*x); |
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436 | tlimit = 2.0/formfact; |
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437 | } |
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438 | } |
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439 | |
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440 | //////////////////////////////////////////////////////////////////////////////// |
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441 | // |
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442 | G4double G4AdjointhIonisationModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple, |
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443 | G4double primEnergy, |
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444 | G4bool IsScatProjToProjCase) |
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445 | { |
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446 | if (UseMatrix) return G4VEmAdjointModel::AdjointCrossSection(aCouple,primEnergy,IsScatProjToProjCase); |
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447 | DefineCurrentMaterial(aCouple); |
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448 | |
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449 | |
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450 | G4double Cross=currentMaterial->GetElectronDensity()*twopi_mc2_rcl2*mass; |
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451 | |
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452 | if (!IsScatProjToProjCase ){ |
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453 | G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(primEnergy); |
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454 | G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(primEnergy); |
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455 | if (Emax_proj>Emin_proj && primEnergy > currentTcutForDirectSecond) { |
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456 | Cross*=(1./Emin_proj -1./Emax_proj)/primEnergy; |
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457 | } |
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458 | else Cross=0.; |
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459 | |
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460 | |
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461 | |
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462 | |
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463 | |
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464 | |
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465 | } |
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466 | else { |
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467 | G4double Emax_proj = GetSecondAdjEnergyMaxForScatProjToProjCase(primEnergy); |
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468 | G4double Emin_proj = GetSecondAdjEnergyMinForScatProjToProjCase(primEnergy,currentTcutForDirectSecond); |
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469 | G4double diff1=Emin_proj-primEnergy; |
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470 | G4double diff2=Emax_proj-primEnergy; |
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471 | G4double t1=(1./diff1+1./Emin_proj-1./diff2-1./Emax_proj)/primEnergy; |
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472 | G4double t2=2.*std::log(diff2*Emin_proj/Emax_proj/diff1)/primEnergy/primEnergy; |
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473 | Cross*=(t1+t2); |
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474 | |
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475 | |
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476 | } |
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477 | lastCS =Cross; |
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478 | return Cross; |
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479 | } |
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480 | ////////////////////////////////////////////////////////////////////////////// |
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481 | // |
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482 | G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMaxForScatProjToProjCase(G4double PrimAdjEnergy) |
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483 | { |
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484 | G4double Tmax=PrimAdjEnergy*one_plus_ratio_2/(one_minus_ratio_2-2.*ratio*PrimAdjEnergy/mass); |
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485 | return Tmax; |
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486 | } |
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487 | ////////////////////////////////////////////////////////////////////////////// |
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488 | // |
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489 | G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMinForScatProjToProjCase(G4double PrimAdjEnergy,G4double Tcut) |
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490 | { return PrimAdjEnergy+Tcut; |
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491 | } |
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492 | ////////////////////////////////////////////////////////////////////////////// |
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493 | // |
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494 | G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMaxForProdToProjCase(G4double ) |
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495 | { return HighEnergyLimit; |
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496 | } |
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497 | ////////////////////////////////////////////////////////////////////////////// |
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498 | // |
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499 | G4double G4AdjointhIonisationModel::GetSecondAdjEnergyMinForProdToProjCase(G4double PrimAdjEnergy) |
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500 | { G4double Tmin= (2*PrimAdjEnergy-4*mass + std::sqrt(4.*PrimAdjEnergy*PrimAdjEnergy +16.*mass*mass + 8.*PrimAdjEnergy*mass*(1/ratio +ratio)))/4.; |
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501 | return Tmin; |
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502 | } |
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