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27 // 27 //
28 // Geant4 Class file 28 // Geant4 Class file
29 // 29 //
30 // File name: G4PolarizedGammaConversionMo 30 // File name: G4PolarizedGammaConversionModel
31 // 31 //
32 // Author: Karim Laihem 32 // Author: Karim Laihem
33 // 33 //
34 // Class Description: 34 // Class Description:
35 // Implementation of gamma conversion to e+e 35 // Implementation of gamma conversion to e+e- in the field of a nucleus
36 // including polarization transfer 36 // including polarization transfer
37 37
38 #include "G4PolarizedGammaConversionModel.hh" 38 #include "G4PolarizedGammaConversionModel.hh"
39 39
40 #include "G4DataVector.hh" 40 #include "G4DataVector.hh"
41 #include "G4DynamicParticle.hh" 41 #include "G4DynamicParticle.hh"
42 #include "G4MaterialCutsCouple.hh" 42 #include "G4MaterialCutsCouple.hh"
43 #include "G4PolarizedGammaConversionXS.hh" 43 #include "G4PolarizedGammaConversionXS.hh"
44 #include "G4PolarizationHelper.hh" 44 #include "G4PolarizationHelper.hh"
45 #include "G4StokesVector.hh" 45 #include "G4StokesVector.hh"
46 46
47 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
48 G4PolarizedGammaConversionModel::G4PolarizedGa 48 G4PolarizedGammaConversionModel::G4PolarizedGammaConversionModel(
49 const G4ParticleDefinition* pd, const G4Stri 49 const G4ParticleDefinition* pd, const G4String& nam)
50 : G4BetheHeitlerModel(pd, nam) 50 : G4BetheHeitlerModel(pd, nam)
51 , fCrossSectionCalculator(nullptr) 51 , fCrossSectionCalculator(nullptr)
52 {} 52 {}
53 53
54 //....oooOO0OOooo........oooOO0OOooo........oo 54 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
55 G4PolarizedGammaConversionModel::~G4PolarizedG 55 G4PolarizedGammaConversionModel::~G4PolarizedGammaConversionModel()
56 { 56 {
57 if(fCrossSectionCalculator) 57 if(fCrossSectionCalculator)
58 delete fCrossSectionCalculator; 58 delete fCrossSectionCalculator;
59 } 59 }
60 60
61 //....oooOO0OOooo........oooOO0OOooo........oo 61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
62 void G4PolarizedGammaConversionModel::Initiali 62 void G4PolarizedGammaConversionModel::Initialise(const G4ParticleDefinition* pd,
63 63 const G4DataVector& dv)
64 { 64 {
65 G4BetheHeitlerModel::Initialise(pd, dv); 65 G4BetheHeitlerModel::Initialise(pd, dv);
66 if(!fCrossSectionCalculator) 66 if(!fCrossSectionCalculator)
67 fCrossSectionCalculator = new G4PolarizedG 67 fCrossSectionCalculator = new G4PolarizedGammaConversionXS();
68 } 68 }
69 69
70 //....oooOO0OOooo........oooOO0OOooo........oo 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71 void G4PolarizedGammaConversionModel::SampleSe 71 void G4PolarizedGammaConversionModel::SampleSecondaries(
72 std::vector<G4DynamicParticle*>* vdp, const 72 std::vector<G4DynamicParticle*>* vdp, const G4MaterialCutsCouple* couple,
73 const G4DynamicParticle* dp, G4double tmin, 73 const G4DynamicParticle* dp, G4double tmin, G4double maxEnergy)
74 { 74 {
75 G4BetheHeitlerModel::SampleSecondaries(vdp, 75 G4BetheHeitlerModel::SampleSecondaries(vdp, couple, dp, tmin, maxEnergy);
76 76
77 if(vdp && vdp->size() > 0) 77 if(vdp && vdp->size() > 0)
78 { 78 {
79 G4double gamEnergy0 = dp->GetKineticEnergy 79 G4double gamEnergy0 = dp->GetKineticEnergy();
80 G4double lepEnergy1 = (*vdp)[0]->GetKineti 80 G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy();
81 G4double sintheta = 81 G4double sintheta =
82 dp->GetMomentumDirection().cross((*vdp)[ 82 dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
83 if(sintheta > 1.) 83 if(sintheta > 1.)
84 sintheta = 1.; 84 sintheta = 1.;
85 85
86 G4StokesVector beamPol = G4StokesVector(dp 86 G4StokesVector beamPol = G4StokesVector(dp->GetPolarization());
87 beamPol.SetPhoton(); 87 beamPol.SetPhoton();
88 88
89 // determine interaction plane 89 // determine interaction plane
90 G4ThreeVector nInteractionFrame = G4Polari 90 G4ThreeVector nInteractionFrame = G4PolarizationHelper::GetFrame(
91 dp->GetMomentumDirection(), (*vdp)[0]->G 91 dp->GetMomentumDirection(), (*vdp)[0]->GetMomentumDirection());
92 92
93 // transform polarization into interaction 93 // transform polarization into interaction frame
94 beamPol.InvRotateAz(nInteractionFrame, dp- 94 beamPol.InvRotateAz(nInteractionFrame, dp->GetMomentumDirection());
95 95
96 // calculate polarization transfer 96 // calculate polarization transfer
97 fCrossSectionCalculator->SetMaterial( 97 fCrossSectionCalculator->SetMaterial(
98 GetCurrentElement()->GetN(), // number 98 GetCurrentElement()->GetN(), // number of nucleons
99 GetCurrentElement()->GetZ(), GetCurrentE 99 GetCurrentElement()->GetZ(), GetCurrentElement()->GetfCoulomb());
100 fCrossSectionCalculator->Initialize(gamEne 100 fCrossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta,
101 beamPo 101 beamPol, G4StokesVector::ZERO);
102 102
103 // determine final state polarization 103 // determine final state polarization
104 G4StokesVector lep1Pol = fCrossSectionCalc 104 G4StokesVector lep1Pol = fCrossSectionCalculator->GetPol2();
105 lep1Pol.RotateAz(nInteractionFrame, (*vdp) 105 lep1Pol.RotateAz(nInteractionFrame, (*vdp)[0]->GetMomentumDirection());
106 (*vdp)[0]->SetPolarization(lep1Pol.p1(), l 106 (*vdp)[0]->SetPolarization(lep1Pol.p1(), lep1Pol.p2(), lep1Pol.p3());
107 107
108 size_t num = vdp->size(); 108 size_t num = vdp->size();
109 if(num != 2) 109 if(num != 2)
110 { 110 {
111 G4ExceptionDescription ed; 111 G4ExceptionDescription ed;
112 ed << " WARNING " << num 112 ed << " WARNING " << num
113 << " secondaries in polarized pairpro 113 << " secondaries in polarized pairproduction not supported!\n";
114 G4Exception("G4PolarizedGammaConversionM 114 G4Exception("G4PolarizedGammaConversionModel::SampleSecondaries",
115 "pol018", JustWarning, ed); 115 "pol018", JustWarning, ed);
116 } 116 }
117 for(size_t i = 1; i < num; ++i) 117 for(size_t i = 1; i < num; ++i)
118 { 118 {
119 G4StokesVector lep2Pol = fCrossSectionCa 119 G4StokesVector lep2Pol = fCrossSectionCalculator->GetPol3();
120 lep2Pol.RotateAz(nInteractionFrame, (*vd 120 lep2Pol.RotateAz(nInteractionFrame, (*vdp)[i]->GetMomentumDirection());
121 (*vdp)[i]->SetPolarization(lep2Pol.p1(), 121 (*vdp)[i]->SetPolarization(lep2Pol.p1(), lep2Pol.p2(), lep2Pol.p3());
122 } 122 }
123 } 123 }
124 } 124 }
125 125