[966] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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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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[1228] | 26 | // $Id: G4AdjointPhotoElectricModel.cc,v 1.5 2009/12/16 17:50:05 gunter Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-03 $ |
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[1196] | 28 | // |
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[966] | 29 | #include "G4AdjointPhotoElectricModel.hh" |
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| 30 | #include "G4AdjointCSManager.hh" |
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| 31 | |
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| 32 | |
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| 33 | #include "G4Integrator.hh" |
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| 34 | #include "G4TrackStatus.hh" |
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| 35 | #include "G4ParticleChange.hh" |
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| 36 | #include "G4AdjointElectron.hh" |
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| 37 | #include "G4Gamma.hh" |
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| 38 | #include "G4AdjointGamma.hh" |
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| 39 | |
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[1196] | 40 | |
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[966] | 41 | //////////////////////////////////////////////////////////////////////////////// |
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| 42 | // |
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| 43 | G4AdjointPhotoElectricModel::G4AdjointPhotoElectricModel(): |
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| 44 | G4VEmAdjointModel("AdjointPEEffect") |
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| 45 | |
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| 46 | { SetUseMatrix(false); |
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[1196] | 47 | SetApplyCutInRange(false); |
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[966] | 48 | current_eEnergy =0.; |
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| 49 | totAdjointCS=0.; |
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[1196] | 50 | theAdjEquivOfDirectPrimPartDef =G4AdjointGamma::AdjointGamma(); |
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| 51 | theAdjEquivOfDirectSecondPartDef=G4AdjointElectron::AdjointElectron(); |
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| 52 | theDirectPrimaryPartDef=G4Gamma::Gamma(); |
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| 53 | second_part_of_same_type=false; |
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| 54 | theDirectPEEffectModel = new G4PEEffectModel(); |
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| 55 | |
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[966] | 56 | } |
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| 57 | //////////////////////////////////////////////////////////////////////////////// |
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| 58 | // |
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| 59 | G4AdjointPhotoElectricModel::~G4AdjointPhotoElectricModel() |
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| 60 | {;} |
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| 61 | |
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| 62 | //////////////////////////////////////////////////////////////////////////////// |
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| 63 | // |
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| 64 | void G4AdjointPhotoElectricModel::SampleSecondaries(const G4Track& aTrack, |
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| 65 | G4bool IsScatProjToProjCase, |
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| 66 | G4ParticleChange* fParticleChange) |
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| 67 | { if (IsScatProjToProjCase) return ; |
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| 68 | |
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| 69 | //Compute the totAdjointCS vectors if not already done for the current couple and electron energy |
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[1196] | 70 | //----------------------------------------------------------------------------------------------- |
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[966] | 71 | const G4MaterialCutsCouple* aCouple = aTrack.GetMaterialCutsCouple(); |
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| 72 | const G4DynamicParticle* aDynPart = aTrack.GetDynamicParticle() ; |
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| 73 | G4double electronEnergy = aDynPart->GetKineticEnergy(); |
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| 74 | G4ThreeVector electronDirection= aDynPart->GetMomentumDirection() ; |
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[1196] | 75 | pre_step_AdjointCS = totAdjointCS; //The last computed CS was at pre step point |
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| 76 | G4double adjCS; |
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| 77 | adjCS = AdjointCrossSection(aCouple, electronEnergy,IsScatProjToProjCase); |
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| 78 | post_step_AdjointCS = totAdjointCS; |
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[966] | 79 | |
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| 80 | |
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[1196] | 81 | |
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| 82 | |
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[966] | 83 | //Sample element |
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| 84 | //------------- |
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| 85 | const G4ElementVector* theElementVector = currentMaterial->GetElementVector(); |
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| 86 | size_t nelm = currentMaterial->GetNumberOfElements(); |
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[1196] | 87 | G4double rand_CS= G4UniformRand()*xsec[nelm-1]; |
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[966] | 88 | for (index_element=0; index_element<nelm-1; index_element++){ |
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| 89 | if (rand_CS<xsec[index_element]) break; |
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| 90 | } |
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| 91 | |
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| 92 | //Sample shell and binding energy |
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| 93 | //------------- |
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| 94 | G4int nShells = (*theElementVector)[index_element]->GetNbOfAtomicShells(); |
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[1196] | 95 | rand_CS= shell_prob[index_element][nShells-1]*G4UniformRand(); |
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[966] | 96 | G4int i = 0; |
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| 97 | for (i=0; i<nShells-1; i++){ |
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| 98 | if (rand_CS<shell_prob[index_element][i]) break; |
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| 99 | } |
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| 100 | G4double gammaEnergy= electronEnergy+(*theElementVector)[index_element]->GetAtomicShell(i); |
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| 101 | |
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| 102 | //Sample cos theta |
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| 103 | //Copy of the G4PEEffectModel cos theta sampling method ElecCosThetaDistribution. |
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| 104 | //This method cannot be used directly from G4PEEffectModel because it is a friend method. I should ask Vladimir to change that |
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| 105 | //------------------------------------------------------------------------------------------------ |
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| 106 | //G4double cos_theta = theDirectPEEffectModel->ElecCosThetaDistribution(electronEnergy); |
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| 107 | |
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| 108 | G4double cos_theta = 1.; |
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| 109 | G4double gamma = 1. + electronEnergy/electron_mass_c2; |
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| 110 | if (gamma <= 5.) { |
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[1228] | 111 | G4double beta = std::sqrt(gamma*gamma-1.)/gamma; |
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[966] | 112 | G4double b = 0.5*gamma*(gamma-1.)*(gamma-2); |
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| 113 | |
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| 114 | G4double rndm,term,greject,grejsup; |
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| 115 | if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b); |
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| 116 | else grejsup = gamma*gamma*(1.+b+beta*b); |
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| 117 | |
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| 118 | do { rndm = 1.-2*G4UniformRand(); |
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| 119 | cos_theta = (rndm+beta)/(rndm*beta+1.); |
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| 120 | term = 1.-beta*cos_theta; |
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| 121 | greject = (1.-cos_theta*cos_theta)*(1.+b*term)/(term*term); |
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| 122 | } while(greject < G4UniformRand()*grejsup); |
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| 123 | } |
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| 124 | |
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| 125 | // direction of the adjoint gamma electron |
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| 126 | //--------------------------------------- |
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| 127 | |
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| 128 | |
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[1228] | 129 | G4double sin_theta = std::sqrt(1.-cos_theta*cos_theta); |
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[966] | 130 | G4double Phi = twopi * G4UniformRand(); |
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[1228] | 131 | G4double dirx = sin_theta*std::cos(Phi),diry = sin_theta*std::sin(Phi),dirz = cos_theta; |
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[966] | 132 | G4ThreeVector adjoint_gammaDirection(dirx,diry,dirz); |
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| 133 | adjoint_gammaDirection.rotateUz(electronDirection); |
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| 134 | |
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| 135 | |
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| 136 | |
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| 137 | //Weight correction |
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| 138 | //----------------------- |
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[1196] | 139 | CorrectPostStepWeight(fParticleChange, aTrack.GetWeight(), electronEnergy,gammaEnergy,IsScatProjToProjCase); |
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[966] | 140 | |
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| 141 | |
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| 142 | |
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| 143 | //Create secondary and modify fParticleChange |
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| 144 | //-------------------------------------------- |
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| 145 | G4DynamicParticle* anAdjointGamma = new G4DynamicParticle ( |
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| 146 | G4AdjointGamma::AdjointGamma(),adjoint_gammaDirection, gammaEnergy); |
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[1196] | 147 | |
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| 148 | |
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| 149 | |
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| 150 | |
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| 151 | |
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[966] | 152 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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[1196] | 153 | fParticleChange->AddSecondary(anAdjointGamma); |
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[966] | 154 | |
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| 155 | |
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| 156 | |
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| 157 | |
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[1196] | 158 | } |
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| 159 | |
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| 160 | //////////////////////////////////////////////////////////////////////////////// |
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| 161 | // |
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| 162 | void G4AdjointPhotoElectricModel::CorrectPostStepWeight(G4ParticleChange* fParticleChange, |
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| 163 | G4double old_weight, |
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| 164 | G4double adjointPrimKinEnergy, |
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| 165 | G4double projectileKinEnergy , |
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| 166 | G4bool ) |
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| 167 | { |
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| 168 | G4double new_weight=old_weight; |
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| 169 | |
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| 170 | G4double w_corr =G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection()/factorCSBiasing; |
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| 171 | w_corr*=post_step_AdjointCS/pre_step_AdjointCS; |
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| 172 | new_weight*=w_corr; |
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| 173 | new_weight*=projectileKinEnergy/adjointPrimKinEnergy; |
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| 174 | fParticleChange->SetParentWeightByProcess(false); |
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| 175 | fParticleChange->SetSecondaryWeightByProcess(false); |
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| 176 | fParticleChange->ProposeParentWeight(new_weight); |
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[966] | 177 | } |
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| 178 | |
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| 179 | //////////////////////////////////////////////////////////////////////////////// |
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| 180 | // |
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| 181 | |
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| 182 | G4double G4AdjointPhotoElectricModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple, |
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| 183 | G4double electronEnergy, |
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| 184 | G4bool IsScatProjToProjCase) |
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[1196] | 185 | { |
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| 186 | |
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| 187 | |
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| 188 | if (IsScatProjToProjCase) return 0.; |
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| 189 | |
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| 190 | |
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[966] | 191 | if (aCouple !=currentCouple || current_eEnergy !=electronEnergy) { |
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| 192 | totAdjointCS = 0.; |
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| 193 | DefineCurrentMaterialAndElectronEnergy(aCouple, electronEnergy); |
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| 194 | const G4ElementVector* theElementVector = currentMaterial->GetElementVector(); |
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[1196] | 195 | const double* theAtomNumDensityVector = currentMaterial->GetVecNbOfAtomsPerVolume(); |
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[966] | 196 | size_t nelm = currentMaterial->GetNumberOfElements(); |
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| 197 | for (index_element=0;index_element<nelm;index_element++){ |
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| 198 | |
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| 199 | totAdjointCS +=AdjointCrossSectionPerAtom((*theElementVector)[index_element],electronEnergy)*theAtomNumDensityVector[index_element]; |
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| 200 | xsec[index_element] = totAdjointCS; |
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| 201 | } |
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[1196] | 202 | |
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| 203 | totBiasedAdjointCS=std::min(totAdjointCS,0.01); |
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| 204 | // totBiasedAdjointCS=totAdjointCS; |
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| 205 | factorCSBiasing = totBiasedAdjointCS/totAdjointCS; |
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| 206 | lastCS=totBiasedAdjointCS; |
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| 207 | |
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| 208 | |
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| 209 | } |
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| 210 | return totBiasedAdjointCS; |
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| 211 | |
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[966] | 212 | |
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| 213 | } |
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| 214 | //////////////////////////////////////////////////////////////////////////////// |
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| 215 | // |
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| 216 | |
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| 217 | G4double G4AdjointPhotoElectricModel::AdjointCrossSectionPerAtom(const G4Element* anElement,G4double electronEnergy) |
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| 218 | { |
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| 219 | G4int nShells = anElement->GetNbOfAtomicShells(); |
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| 220 | G4double Z= anElement->GetZ(); |
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| 221 | G4int i = 0; |
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| 222 | G4double B0=anElement->GetAtomicShell(0); |
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| 223 | G4double gammaEnergy = electronEnergy+B0; |
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[1196] | 224 | G4double CS= theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,0.,0.,0.); |
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| 225 | G4double adjointCS =0.; |
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| 226 | if (CS >0) adjointCS += CS/gammaEnergy; |
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[966] | 227 | shell_prob[index_element][0] = adjointCS; |
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| 228 | for (i=1;i<nShells;i++){ |
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[1196] | 229 | //G4cout<<i<<G4endl; |
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[966] | 230 | G4double Bi_= anElement->GetAtomicShell(i-1); |
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| 231 | G4double Bi = anElement->GetAtomicShell(i); |
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[1196] | 232 | //G4cout<<Bi_<<'\t'<<Bi<<G4endl; |
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[966] | 233 | if (electronEnergy <Bi_-Bi) { |
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| 234 | gammaEnergy = electronEnergy+Bi; |
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[1196] | 235 | |
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| 236 | CS=theDirectPEEffectModel->ComputeCrossSectionPerAtom(G4Gamma::Gamma(),gammaEnergy,Z,0.,0.,0.); |
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| 237 | if (CS>0) adjointCS +=CS/gammaEnergy; |
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[966] | 238 | } |
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| 239 | shell_prob[index_element][i] = adjointCS; |
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| 240 | |
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| 241 | } |
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[1196] | 242 | adjointCS*=electronEnergy; |
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[966] | 243 | return adjointCS; |
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| 244 | |
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| 245 | } |
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| 246 | //////////////////////////////////////////////////////////////////////////////// |
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| 247 | // |
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| 248 | |
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| 249 | void G4AdjointPhotoElectricModel::DefineCurrentMaterialAndElectronEnergy(const G4MaterialCutsCouple* couple, G4double anEnergy) |
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| 250 | { currentCouple = const_cast<G4MaterialCutsCouple*> (couple); |
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| 251 | currentMaterial = const_cast<G4Material*> (couple->GetMaterial()); |
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| 252 | currentCoupleIndex = couple->GetIndex(); |
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| 253 | currentMaterialIndex = currentMaterial->GetIndex(); |
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| 254 | current_eEnergy = anEnergy; |
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| 255 | } |
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