[966] | 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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[1228] | 26 | // $Id: G4AdjointBremsstrahlungModel.cc,v 1.5 2009/12/16 17:50:01 gunter Exp $ |
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[1337] | 27 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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[1196] | 28 | // |
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[966] | 29 | #include "G4AdjointBremsstrahlungModel.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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[1196] | 35 | #include "G4AdjointGamma.hh" |
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| 36 | #include "G4Electron.hh" |
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| 37 | |
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[966] | 38 | #include "G4Timer.hh" |
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[1196] | 39 | //#include "G4PenelopeBremsstrahlungModel.hh" |
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[966] | 40 | |
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[1196] | 41 | |
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[966] | 42 | //////////////////////////////////////////////////////////////////////////////// |
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| 43 | // |
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| 44 | G4AdjointBremsstrahlungModel::G4AdjointBremsstrahlungModel(): |
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[1196] | 45 | G4VEmAdjointModel("AdjointeBremModel"), |
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| 46 | MigdalConstant(classic_electr_radius*electron_Compton_length*electron_Compton_length*4.0*pi) |
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| 47 | { |
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| 48 | SetUseMatrix(false); |
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[966] | 49 | SetUseMatrixPerElement(false); |
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[1196] | 50 | |
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| 51 | theDirectStdBremModel = new G4eBremsstrahlungModel(G4Electron::Electron(),"TheDirecteBremModel"); |
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| 52 | theDirectEMModel=theDirectStdBremModel; |
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| 53 | // theDirectPenelopeBremModel =0; |
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| 54 | |
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[966] | 55 | SetApplyCutInRange(true); |
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| 56 | highKinEnergy= 100.*TeV; |
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| 57 | lowKinEnergy = 1.0*keV; |
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| 58 | theTimer =new G4Timer(); |
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| 59 | |
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[1196] | 60 | theAdjEquivOfDirectPrimPartDef =G4AdjointElectron::AdjointElectron(); |
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| 61 | theAdjEquivOfDirectSecondPartDef=G4AdjointGamma::AdjointGamma(); |
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| 62 | theDirectPrimaryPartDef=G4Electron::Electron(); |
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| 63 | second_part_of_same_type=false; |
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[966] | 64 | |
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[1196] | 65 | /*UsePenelopeModel=false; |
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| 66 | if (UsePenelopeModel) { |
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| 67 | G4PenelopeBremsstrahlungModel* thePenelopeModel = new G4PenelopeBremsstrahlungModel(G4Electron::Electron(),"PenelopeBrem"); |
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| 68 | theEmModelManagerForFwdModels = new G4EmModelManager(); |
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| 69 | isPenelopeModelInitialised = false; |
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| 70 | G4VEmFluctuationModel* f=0; |
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| 71 | G4Region* r=0; |
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| 72 | theDirectEMModel=thePenelopeModel; |
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| 73 | theEmModelManagerForFwdModels->AddEmModel(1, thePenelopeModel, f, r); |
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| 74 | } |
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| 75 | */ |
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[966] | 76 | |
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[1196] | 77 | |
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| 78 | |
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[966] | 79 | } |
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[1196] | 80 | |
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[966] | 81 | //////////////////////////////////////////////////////////////////////////////// |
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| 82 | // |
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[1196] | 83 | void G4AdjointBremsstrahlungModel::SampleSecondaries(const G4Track& aTrack, |
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| 84 | G4bool IsScatProjToProjCase, |
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| 85 | G4ParticleChange* fParticleChange) |
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[966] | 86 | { |
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[1196] | 87 | if (!UseMatrix) return RapidSampleSecondaries(aTrack,IsScatProjToProjCase,fParticleChange); |
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[966] | 88 | |
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[1196] | 89 | const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle(); |
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| 90 | DefineCurrentMaterial(aTrack.GetMaterialCutsCouple()); |
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[966] | 91 | |
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| 92 | |
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[1196] | 93 | G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy(); |
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| 94 | G4double adjointPrimTotalEnergy = theAdjointPrimary->GetTotalEnergy(); |
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| 95 | |
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| 96 | if (adjointPrimKinEnergy>HighEnergyLimit*0.999){ |
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| 97 | return; |
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[966] | 98 | } |
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| 99 | |
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[1196] | 100 | G4double projectileKinEnergy = SampleAdjSecEnergyFromCSMatrix(adjointPrimKinEnergy, |
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| 101 | IsScatProjToProjCase); |
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| 102 | //Weight correction |
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| 103 | //----------------------- |
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| 104 | CorrectPostStepWeight(fParticleChange, |
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| 105 | aTrack.GetWeight(), |
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| 106 | adjointPrimKinEnergy, |
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| 107 | projectileKinEnergy, |
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| 108 | IsScatProjToProjCase); |
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[966] | 109 | |
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| 110 | |
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[1196] | 111 | //Kinematic |
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| 112 | //--------- |
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| 113 | G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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| 114 | G4double projectileTotalEnergy = projectileM0+projectileKinEnergy; |
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| 115 | G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0; |
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| 116 | G4double projectileP = std::sqrt(projectileP2); |
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| 117 | |
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| 118 | |
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| 119 | //Angle of the gamma direction with the projectile taken from G4eBremsstrahlungModel |
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| 120 | //------------------------------------------------ |
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| 121 | G4double u; |
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| 122 | const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ; |
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[966] | 123 | |
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[1228] | 124 | if (9./(9.+d) > G4UniformRand()) u = - std::log(G4UniformRand()*G4UniformRand())/a1; |
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| 125 | else u = - std::log(G4UniformRand()*G4UniformRand())/a2; |
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[966] | 126 | |
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[1196] | 127 | G4double theta = u*electron_mass_c2/projectileTotalEnergy; |
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[966] | 128 | |
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[1196] | 129 | G4double sint = std::sin(theta); |
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| 130 | G4double cost = std::cos(theta); |
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[966] | 131 | |
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[1196] | 132 | G4double phi = twopi * G4UniformRand() ; |
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[966] | 133 | |
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[1196] | 134 | G4ThreeVector projectileMomentum; |
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| 135 | projectileMomentum=G4ThreeVector(std::cos(phi)*sint,std::sin(phi)*sint,cost)*projectileP; //gamma frame |
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| 136 | if (IsScatProjToProjCase) {//the adjoint primary is the scattered e- |
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| 137 | G4ThreeVector gammaMomentum = (projectileTotalEnergy-adjointPrimTotalEnergy)*G4ThreeVector(0.,0.,1.); |
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| 138 | G4ThreeVector dirProd=projectileMomentum-gammaMomentum; |
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| 139 | G4double cost1 = std::cos(dirProd.angle(projectileMomentum)); |
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| 140 | G4double sint1 = std::sqrt(1.-cost1*cost1); |
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| 141 | projectileMomentum=G4ThreeVector(std::cos(phi)*sint1,std::sin(phi)*sint1,cost1)*projectileP; |
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| 142 | |
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| 143 | } |
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| 144 | |
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| 145 | projectileMomentum.rotateUz(theAdjointPrimary->GetMomentumDirection()); |
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[966] | 146 | |
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| 147 | |
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[1196] | 148 | |
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| 149 | if (!IsScatProjToProjCase ){ //kill the primary and add a secondary |
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| 150 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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| 151 | fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum)); |
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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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[966] | 156 | |
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[1196] | 157 | } |
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| 158 | } |
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[966] | 159 | //////////////////////////////////////////////////////////////////////////////// |
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| 160 | // |
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[1196] | 161 | void G4AdjointBremsstrahlungModel::RapidSampleSecondaries(const G4Track& aTrack, |
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[966] | 162 | G4bool IsScatProjToProjCase, |
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| 163 | G4ParticleChange* fParticleChange) |
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| 164 | { |
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| 165 | |
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[1196] | 166 | const G4DynamicParticle* theAdjointPrimary =aTrack.GetDynamicParticle(); |
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| 167 | DefineCurrentMaterial(aTrack.GetMaterialCutsCouple()); |
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[966] | 168 | |
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| 169 | |
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| 170 | G4double adjointPrimKinEnergy = theAdjointPrimary->GetKineticEnergy(); |
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| 171 | G4double adjointPrimTotalEnergy = theAdjointPrimary->GetTotalEnergy(); |
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[1196] | 172 | |
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[966] | 173 | if (adjointPrimKinEnergy>HighEnergyLimit*0.999){ |
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| 174 | return; |
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| 175 | } |
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[1196] | 176 | |
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| 177 | G4double projectileKinEnergy =0.; |
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| 178 | G4double gammaEnergy=0.; |
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| 179 | G4double diffCSUsed=0.; |
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| 180 | if (!IsScatProjToProjCase){ |
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| 181 | gammaEnergy=adjointPrimKinEnergy; |
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| 182 | G4double Emax = GetSecondAdjEnergyMaxForProdToProjCase(adjointPrimKinEnergy); |
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| 183 | G4double Emin= GetSecondAdjEnergyMinForProdToProjCase(adjointPrimKinEnergy);; |
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| 184 | if (Emin>=Emax) return; |
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[1228] | 185 | projectileKinEnergy=Emin*std::pow(Emax/Emin,G4UniformRand()); |
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[1196] | 186 | diffCSUsed=lastCZ/projectileKinEnergy; |
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| 187 | |
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| 188 | } |
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| 189 | else { G4double Emax = GetSecondAdjEnergyMaxForScatProjToProjCase(adjointPrimKinEnergy); |
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| 190 | G4double Emin = GetSecondAdjEnergyMinForScatProjToProjCase(adjointPrimKinEnergy,currentTcutForDirectSecond); |
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| 191 | if (Emin>=Emax) return; |
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| 192 | G4double f1=(Emin-adjointPrimKinEnergy)/Emin; |
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| 193 | G4double f2=(Emax-adjointPrimKinEnergy)/Emax/f1; |
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| 194 | //G4cout<<"f1 and f2 "<<f1<<'\t'<<f2<<G4endl; |
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[1228] | 195 | projectileKinEnergy=adjointPrimKinEnergy/(1.-f1*std::pow(f2,G4UniformRand())); |
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[1196] | 196 | gammaEnergy=projectileKinEnergy-adjointPrimKinEnergy; |
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| 197 | diffCSUsed=lastCZ*adjointPrimKinEnergy/projectileKinEnergy/gammaEnergy; |
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| 198 | |
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| 199 | } |
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| 200 | |
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| 201 | |
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| 202 | |
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| 203 | |
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| 204 | //Weight correction |
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[966] | 205 | //----------------------- |
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[1196] | 206 | //First w_corr is set to the ratio between adjoint total CS and fwd total CS |
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| 207 | G4double w_corr=G4AdjointCSManager::GetAdjointCSManager()->GetPostStepWeightCorrection(); |
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| 208 | |
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| 209 | //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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| 210 | //Here we consider the true diffCS as the one obtained by the numericla differentiation over Tcut of the direct CS, corrected by the Migdal term. |
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| 211 | //Basically any other differential CS diffCS could be used here (example Penelope). |
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[966] | 212 | |
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[1196] | 213 | G4double diffCS = DiffCrossSectionPerVolumePrimToSecond(currentMaterial, projectileKinEnergy, gammaEnergy); |
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| 214 | w_corr*=diffCS/diffCSUsed; |
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| 215 | |
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| 216 | G4double new_weight = aTrack.GetWeight()*w_corr; |
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| 217 | fParticleChange->SetParentWeightByProcess(false); |
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| 218 | fParticleChange->SetSecondaryWeightByProcess(false); |
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| 219 | fParticleChange->ProposeParentWeight(new_weight); |
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[966] | 220 | |
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| 221 | //Kinematic |
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| 222 | //--------- |
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[1196] | 223 | G4double projectileM0 = theAdjEquivOfDirectPrimPartDef->GetPDGMass(); |
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[966] | 224 | G4double projectileTotalEnergy = projectileM0+projectileKinEnergy; |
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| 225 | G4double projectileP2 = projectileTotalEnergy*projectileTotalEnergy - projectileM0*projectileM0; |
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| 226 | G4double projectileP = std::sqrt(projectileP2); |
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| 227 | |
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| 228 | |
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| 229 | //Angle of the gamma direction with the projectile taken from G4eBremsstrahlungModel |
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| 230 | //------------------------------------------------ |
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| 231 | G4double u; |
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| 232 | const G4double a1 = 0.625 , a2 = 3.*a1 , d = 27. ; |
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| 233 | |
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[1228] | 234 | if (9./(9.+d) > G4UniformRand()) u = - std::log(G4UniformRand()*G4UniformRand())/a1; |
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| 235 | else u = - std::log(G4UniformRand()*G4UniformRand())/a2; |
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[966] | 236 | |
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| 237 | G4double theta = u*electron_mass_c2/projectileTotalEnergy; |
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| 238 | |
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| 239 | G4double sint = std::sin(theta); |
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| 240 | G4double cost = std::cos(theta); |
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| 241 | |
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| 242 | G4double phi = twopi * G4UniformRand() ; |
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| 243 | |
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| 244 | G4ThreeVector projectileMomentum; |
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| 245 | projectileMomentum=G4ThreeVector(std::cos(phi)*sint,std::sin(phi)*sint,cost)*projectileP; //gamma frame |
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| 246 | if (IsScatProjToProjCase) {//the adjoint primary is the scattered e- |
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| 247 | G4ThreeVector gammaMomentum = (projectileTotalEnergy-adjointPrimTotalEnergy)*G4ThreeVector(0.,0.,1.); |
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| 248 | G4ThreeVector dirProd=projectileMomentum-gammaMomentum; |
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| 249 | G4double cost1 = std::cos(dirProd.angle(projectileMomentum)); |
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| 250 | G4double sint1 = std::sqrt(1.-cost1*cost1); |
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| 251 | projectileMomentum=G4ThreeVector(std::cos(phi)*sint1,std::sin(phi)*sint1,cost1)*projectileP; |
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| 252 | |
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| 253 | } |
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| 254 | |
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| 255 | projectileMomentum.rotateUz(theAdjointPrimary->GetMomentumDirection()); |
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| 256 | |
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| 257 | |
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| 258 | |
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[1196] | 259 | if (!IsScatProjToProjCase ){ //kill the primary and add a secondary |
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[966] | 260 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
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| 261 | fParticleChange->AddSecondary(new G4DynamicParticle(theAdjEquivOfDirectPrimPartDef,projectileMomentum)); |
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| 262 | } |
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| 263 | else { |
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| 264 | fParticleChange->ProposeEnergy(projectileKinEnergy); |
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| 265 | fParticleChange->ProposeMomentumDirection(projectileMomentum.unit()); |
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[1196] | 266 | |
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[966] | 267 | } |
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| 268 | } |
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| 269 | //////////////////////////////////////////////////////////////////////////////// |
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| 270 | // |
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[1196] | 271 | G4AdjointBremsstrahlungModel::~G4AdjointBremsstrahlungModel() |
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| 272 | {;} |
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| 273 | |
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[966] | 274 | //////////////////////////////////////////////////////////////////////////////// |
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| 275 | // |
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[1196] | 276 | G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecond(const G4Material* aMaterial, |
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| 277 | G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction |
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| 278 | G4double kinEnergyProd // kinetic energy of the secondary particle |
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| 279 | ) |
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| 280 | {/*if (UsePenelopeModel && !isPenelopeModelInitialised) { |
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| 281 | theEmModelManagerForFwdModels->Initialise(G4Electron::Electron(),G4Gamma::Gamma(),1.,0); |
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| 282 | isPenelopeModelInitialised =true; |
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| 283 | } |
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| 284 | */ |
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| 285 | return DiffCrossSectionPerVolumePrimToSecondApproximated2(aMaterial, |
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| 286 | kinEnergyProj, |
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| 287 | kinEnergyProd); |
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| 288 | /*return G4VEmAdjointModel::DiffCrossSectionPerVolumePrimToSecond(aMaterial, |
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| 289 | kinEnergyProj, |
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| 290 | kinEnergyProd);*/ |
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| 291 | } |
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[966] | 292 | |
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[1196] | 293 | //////////////////////////////////////////////////////////////////////////////// |
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| 294 | // |
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| 295 | G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecondApproximated1( |
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| 296 | const G4Material* aMaterial, |
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| 297 | G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction |
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| 298 | G4double kinEnergyProd // kinetic energy of the secondary particle |
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| 299 | ) |
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| 300 | { |
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| 301 | G4double dCrossEprod=0.; |
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| 302 | G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(kinEnergyProd); |
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| 303 | G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(kinEnergyProd); |
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| 304 | |
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| 305 | |
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| 306 | //In this approximation we consider that the secondary gammas are sampled with 1/Egamma energy distribution |
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| 307 | //This is what is applied in the discrete standard model before the rejection test that make a cooerction |
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| 308 | //The application of the same rejection function is not possble here. |
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| 309 | //The differentiation of the CS over Ecut does not produce neither a good differential CS. That is due to the |
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| 310 | // fact that in the discrete model the differential CS and the integrated CS are both fitted but separatly and |
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| 311 | // therefore do not allow a correct numerical differentiation of the integrated CS to get the differential one. |
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| 312 | // In the future we plan to use the brem secondary spectra from the G4Penelope implementation |
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| 313 | |
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| 314 | if (kinEnergyProj>Emin_proj && kinEnergyProj<=Emax_proj){ |
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| 315 | G4double sigma=theDirectEMModel->CrossSectionPerVolume(aMaterial,theDirectPrimaryPartDef,kinEnergyProj,1.*keV); |
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| 316 | dCrossEprod=sigma/kinEnergyProd/std::log(kinEnergyProj/keV); |
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| 317 | } |
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| 318 | return dCrossEprod; |
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| 319 | |
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| 320 | } |
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[966] | 321 | |
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[1196] | 322 | //////////////////////////////////////////////////////////////////////////////// |
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| 323 | // |
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| 324 | G4double G4AdjointBremsstrahlungModel::DiffCrossSectionPerVolumePrimToSecondApproximated2( |
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| 325 | const G4Material* material, |
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| 326 | G4double kinEnergyProj, // kinetic energy of the primary particle before the interaction |
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| 327 | G4double kinEnergyProd // kinetic energy of the secondary particle |
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| 328 | ) |
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| 329 | { |
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| 330 | //In this approximation we derive the direct cross section over Tcut=gamma energy, en after apply the Migdla correction factor |
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| 331 | //used in the direct model |
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[966] | 332 | |
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[1196] | 333 | G4double dCrossEprod=0.; |
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| 334 | |
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| 335 | const G4ElementVector* theElementVector = material->GetElementVector(); |
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| 336 | const double* theAtomNumDensityVector = material->GetAtomicNumDensityVector(); |
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| 337 | G4double dum=0.; |
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| 338 | G4double E1=kinEnergyProd,E2=kinEnergyProd*1.001; |
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| 339 | G4double dE=E2-E1; |
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| 340 | for (size_t i=0; i<material->GetNumberOfElements(); i++) { |
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| 341 | G4double C1=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,(*theElementVector)[i]->GetZ(),dum ,E1); |
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| 342 | G4double C2=theDirectEMModel->ComputeCrossSectionPerAtom(theDirectPrimaryPartDef,kinEnergyProj,(*theElementVector)[i]->GetZ(),dum,E2); |
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| 343 | dCrossEprod += theAtomNumDensityVector[i] * (C1-C2)/dE; |
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| 344 | |
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| 345 | } |
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| 346 | |
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| 347 | //Now the Migdal correction |
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| 348 | |
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| 349 | G4double totalEnergy = kinEnergyProj+electron_mass_c2 ; |
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| 350 | G4double kp2 = MigdalConstant*totalEnergy*totalEnergy |
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| 351 | *(material->GetElectronDensity()); |
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| 352 | |
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| 353 | |
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| 354 | G4double MigdalFactor = 1./(1.+kp2/(kinEnergyProd*kinEnergyProd)); // its seems that the factor used in the CS compuation i the direct |
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| 355 | //model is different than the one used in the secondary sampling by a |
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| 356 | //factor (1.+kp2) To be checked! |
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| 357 | |
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| 358 | dCrossEprod*=MigdalFactor; |
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| 359 | return dCrossEprod; |
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[966] | 360 | |
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[1196] | 361 | } |
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| 362 | //////////////////////////////////////////////////////////////////////////////// |
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| 363 | // |
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| 364 | G4double G4AdjointBremsstrahlungModel::AdjointCrossSection(const G4MaterialCutsCouple* aCouple, |
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| 365 | G4double primEnergy, |
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| 366 | G4bool IsScatProjToProjCase) |
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| 367 | {/* if (UsePenelopeModel && !isPenelopeModelInitialised) { |
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| 368 | theEmModelManagerForFwdModels->Initialise(G4Electron::Electron(),G4Gamma::Gamma(),1.,0); |
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| 369 | isPenelopeModelInitialised =true; |
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| 370 | } |
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| 371 | */ |
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| 372 | if (UseMatrix) return G4VEmAdjointModel::AdjointCrossSection(aCouple,primEnergy,IsScatProjToProjCase); |
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| 373 | DefineCurrentMaterial(aCouple); |
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| 374 | G4double Cross=0.; |
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[1228] | 375 | lastCZ=theDirectEMModel->CrossSectionPerVolume(aCouple->GetMaterial(),theDirectPrimaryPartDef,100.*MeV,100.*MeV/std::exp(1.));//this give the constant above |
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[966] | 376 | |
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[1196] | 377 | if (!IsScatProjToProjCase ){ |
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| 378 | G4double Emax_proj = GetSecondAdjEnergyMaxForProdToProjCase(primEnergy); |
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| 379 | G4double Emin_proj = GetSecondAdjEnergyMinForProdToProjCase(primEnergy); |
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[1228] | 380 | if (Emax_proj>Emin_proj && primEnergy > currentTcutForDirectSecond) Cross= lastCZ*std::log(Emax_proj/Emin_proj); |
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[1196] | 381 | } |
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| 382 | else { |
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| 383 | G4double Emax_proj = GetSecondAdjEnergyMaxForScatProjToProjCase(primEnergy); |
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| 384 | G4double Emin_proj = GetSecondAdjEnergyMinForScatProjToProjCase(primEnergy,currentTcutForDirectSecond); |
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[1228] | 385 | if (Emax_proj>Emin_proj) Cross= lastCZ*std::log((Emax_proj-primEnergy)*Emin_proj/Emax_proj/(Emin_proj-primEnergy)); |
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[1196] | 386 | |
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| 387 | } |
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| 388 | return Cross; |
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| 389 | } |
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[966] | 390 | |
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[1196] | 391 | |
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| 392 | |
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| 393 | |
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| 394 | |
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