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25 // 25 //
>> 26 //
26 // ------------------------------------------- 27 // -------------------------------------------------------------------
27 // 28 //
28 // Geant4 Class file << 29 // GEANT4 Class file
>> 30 //
29 // 31 //
30 // File name: G4PolarizedGammaConversionMo 32 // File name: G4PolarizedGammaConversionModel
31 // 33 //
32 // Author: Karim Laihem 34 // Author: Karim Laihem
33 // 35 //
>> 36 // Creation date: 19.04.2005
>> 37 //
>> 38 // Modifications:
>> 39 // 21-08-06 Modified to fit in g4.8.1 framework (A.Schaelicke)
>> 40 // 19-03-07 Add initialisation of crossSectionCalculator (VI)
>> 41 //
34 // Class Description: 42 // Class Description:
35 // Implementation of gamma conversion to e+e << 43 //
36 // including polarization transfer << 44 // Implementation of gamma convertion to e+e- in the field of a nucleus
>> 45 // including polarization transfer
37 46
38 #include "G4PolarizedGammaConversionModel.hh" << 47 // -------------------------------------------------------------------
>> 48 //
>> 49
>> 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
39 52
>> 53 #include "G4PolarizedGammaConversionModel.hh"
>> 54 #include "G4Electron.hh"
>> 55 #include "G4Positron.hh"
>> 56 #include "G4Gamma.hh"
>> 57 #include "Randomize.hh"
40 #include "G4DataVector.hh" 58 #include "G4DataVector.hh"
41 #include "G4DynamicParticle.hh" << 59 #include "G4PhysicsLogVector.hh"
42 #include "G4MaterialCutsCouple.hh" << 60 #include "G4ParticleChangeForGamma.hh"
43 #include "G4PolarizedGammaConversionXS.hh" << 61 #include "G4PolarizedPairProductionCrossSection.hh"
44 #include "G4PolarizationHelper.hh" 62 #include "G4PolarizationHelper.hh"
45 #include "G4StokesVector.hh" <<
46 63
47 //....oooOO0OOooo........oooOO0OOooo........oo 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
48 G4PolarizedGammaConversionModel::G4PolarizedGa << 65
49 const G4ParticleDefinition* pd, const G4Stri << 66
50 : G4BetheHeitlerModel(pd, nam) << 67 G4PolarizedGammaConversionModel::G4PolarizedGammaConversionModel(const G4ParticleDefinition* pd,
51 , fCrossSectionCalculator(nullptr) << 68 const G4String& nam)
52 {} << 69 : G4BetheHeitlerModel(pd,nam), crossSectionCalculator(nullptr)
>> 70 {
>> 71 }
53 72
54 //....oooOO0OOooo........oooOO0OOooo........oo 73 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 74
55 G4PolarizedGammaConversionModel::~G4PolarizedG 75 G4PolarizedGammaConversionModel::~G4PolarizedGammaConversionModel()
56 { 76 {
57 if(fCrossSectionCalculator) << 77 if (crossSectionCalculator) delete crossSectionCalculator;
58 delete fCrossSectionCalculator; <<
59 } 78 }
60 79
61 //....oooOO0OOooo........oooOO0OOooo........oo 80 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 81
62 void G4PolarizedGammaConversionModel::Initiali 82 void G4PolarizedGammaConversionModel::Initialise(const G4ParticleDefinition* pd,
63 << 83 const G4DataVector& dv)
64 { 84 {
65 G4BetheHeitlerModel::Initialise(pd, dv); << 85 G4BetheHeitlerModel::Initialise(pd,dv);
66 if(!fCrossSectionCalculator) << 86 if (!crossSectionCalculator)
67 fCrossSectionCalculator = new G4PolarizedG << 87 crossSectionCalculator = new G4PolarizedPairProductionCrossSection();
68 } 88 }
69 89
70 //....oooOO0OOooo........oooOO0OOooo........oo 90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71 void G4PolarizedGammaConversionModel::SampleSe << 91
72 std::vector<G4DynamicParticle*>* vdp, const << 92 void G4PolarizedGammaConversionModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
73 const G4DynamicParticle* dp, G4double tmin, << 93 const G4MaterialCutsCouple* couple,
>> 94 const G4DynamicParticle* dp,
>> 95 G4double tmin,
>> 96 G4double maxEnergy)
74 { 97 {
75 G4BetheHeitlerModel::SampleSecondaries(vdp, 98 G4BetheHeitlerModel::SampleSecondaries(vdp, couple, dp, tmin, maxEnergy);
76 << 99
77 if(vdp && vdp->size() > 0) << 100 if(vdp && vdp->size()>0) {
78 { <<
79 G4double gamEnergy0 = dp->GetKineticEnergy 101 G4double gamEnergy0 = dp->GetKineticEnergy();
80 G4double lepEnergy1 = (*vdp)[0]->GetKineti 102 G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy();
81 G4double sintheta = << 103 G4double sintheta = dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
82 dp->GetMomentumDirection().cross((*vdp)[ << 104 if (sintheta>1.) sintheta=1.;
83 if(sintheta > 1.) <<
84 sintheta = 1.; <<
85 105
86 G4StokesVector beamPol = G4StokesVector(dp << 106 G4StokesVector beamPol = dp->GetPolarization();
87 beamPol.SetPhoton(); 107 beamPol.SetPhoton();
88 108
89 // determine interaction plane 109 // determine interaction plane
90 G4ThreeVector nInteractionFrame = G4Polari << 110 G4ThreeVector nInteractionFrame =
91 dp->GetMomentumDirection(), (*vdp)[0]->G << 111 G4PolarizationHelper::GetFrame(dp->GetMomentumDirection(),
>> 112 (*vdp)[0]->GetMomentumDirection());
92 113
93 // transform polarization into interaction 114 // transform polarization into interaction frame
94 beamPol.InvRotateAz(nInteractionFrame, dp- << 115 beamPol.InvRotateAz(nInteractionFrame,dp->GetMomentumDirection());
95 116
96 // calculate polarization transfer << 117 // calulcate polarization transfer
97 fCrossSectionCalculator->SetMaterial( << 118 crossSectionCalculator->SetMaterial(GetCurrentElement()->GetN(), // number of nucleons
98 GetCurrentElement()->GetN(), // number << 119 GetCurrentElement()->GetZ(),
99 GetCurrentElement()->GetZ(), GetCurrentE << 120 GetCurrentElement()->GetfCoulomb());
100 fCrossSectionCalculator->Initialize(gamEne << 121 crossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta,
101 beamPo << 122 beamPol, G4StokesVector::ZERO);
102 << 123
103 // determine final state polarization << 124 // deterimine final state polarization
104 G4StokesVector lep1Pol = fCrossSectionCalc << 125 G4StokesVector lep1Pol = crossSectionCalculator->GetPol2();
105 lep1Pol.RotateAz(nInteractionFrame, (*vdp) << 126 lep1Pol.RotateAz(nInteractionFrame,(*vdp)[0]->GetMomentumDirection());
106 (*vdp)[0]->SetPolarization(lep1Pol.p1(), l << 127 (*vdp)[0]->SetPolarization(lep1Pol.p1(),
>> 128 lep1Pol.p2(),
>> 129 lep1Pol.p3());
107 130
108 size_t num = vdp->size(); 131 size_t num = vdp->size();
109 if(num != 2) << 132 if (num!=2) G4cout<<" WARNING "<<num<<" secondaries in polarized pairproduction not supported!\n";
110 { << 133 for (size_t i =1; i<num; ++i) {
111 G4ExceptionDescription ed; << 134 G4StokesVector lep2Pol = crossSectionCalculator->GetPol3();
112 ed << " WARNING " << num << 135 lep2Pol.RotateAz(nInteractionFrame,(*vdp)[i]->GetMomentumDirection());
113 << " secondaries in polarized pairpro << 136 (*vdp)[i]->SetPolarization(lep2Pol.p1(),
114 G4Exception("G4PolarizedGammaConversionM << 137 lep2Pol.p2(),
115 "pol018", JustWarning, ed); << 138 lep2Pol.p3());
116 } << 139
117 for(size_t i = 1; i < num; ++i) <<
118 { <<
119 G4StokesVector lep2Pol = fCrossSectionCa <<
120 lep2Pol.RotateAz(nInteractionFrame, (*vd <<
121 (*vdp)[i]->SetPolarization(lep2Pol.p1(), <<
122 } 140 }
123 } 141 }
124 } 142 }
>> 143
>> 144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
125 145