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25 // 25 //
>> 26 // $Id: G4PolarizedGammaConversionModel.cc,v 1.6 2007-11-01 17:32:34 schaelic Exp $
>> 27 // GEANT4 tag $Name: not supported by cvs2svn $
>> 28 //
26 // ------------------------------------------- 29 // -------------------------------------------------------------------
27 // 30 //
28 // Geant4 Class file << 31 // GEANT4 Class file
>> 32 //
29 // 33 //
30 // File name: G4PolarizedGammaConversionMo 34 // File name: G4PolarizedGammaConversionModel
31 // 35 //
32 // Author: Karim Laihem 36 // Author: Karim Laihem
33 // 37 //
>> 38 // Creation date: 19.04.2005
>> 39 //
>> 40 // Modifications:
>> 41 // 21-08-06 Modified to fit in g4.8.1 framework (A.Schaelicke)
>> 42 // 19-03-07 Add initialisation of crossSectionCalculator (VI)
>> 43 //
34 // Class Description: 44 // Class Description:
35 // Implementation of gamma conversion to e+e << 45 //
36 // including polarization transfer << 46 // Implementation of gamma convertion to e+e- in the field of a nucleus
>> 47 // including polarization transfer
37 48
38 #include "G4PolarizedGammaConversionModel.hh" << 49 // -------------------------------------------------------------------
>> 50 //
>> 51
>> 52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
39 54
>> 55 #include "G4PolarizedGammaConversionModel.hh"
>> 56 #include "G4Electron.hh"
>> 57 #include "G4Positron.hh"
>> 58 #include "G4Gamma.hh"
>> 59 #include "Randomize.hh"
40 #include "G4DataVector.hh" 60 #include "G4DataVector.hh"
41 #include "G4DynamicParticle.hh" << 61 #include "G4PhysicsLogVector.hh"
42 #include "G4MaterialCutsCouple.hh" << 62 #include "G4ParticleChangeForGamma.hh"
43 #include "G4PolarizedGammaConversionXS.hh" << 63 #include "G4PolarizedPairProductionCrossSection.hh"
44 #include "G4PolarizationHelper.hh" 64 #include "G4PolarizationHelper.hh"
45 #include "G4StokesVector.hh" <<
46 65
47 //....oooOO0OOooo........oooOO0OOooo........oo 66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
48 G4PolarizedGammaConversionModel::G4PolarizedGa << 67
49 const G4ParticleDefinition* pd, const G4Stri << 68
50 : G4BetheHeitlerModel(pd, nam) << 69 G4PolarizedGammaConversionModel::G4PolarizedGammaConversionModel(const G4ParticleDefinition* pd,
51 , fCrossSectionCalculator(nullptr) << 70 const G4String& nam)
52 {} << 71 : G4BetheHeitlerModel(pd,nam), crossSectionCalculator(0)
>> 72 {
>> 73 }
53 74
54 //....oooOO0OOooo........oooOO0OOooo........oo 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 76
55 G4PolarizedGammaConversionModel::~G4PolarizedG 77 G4PolarizedGammaConversionModel::~G4PolarizedGammaConversionModel()
56 { 78 {
57 if(fCrossSectionCalculator) << 79 if (crossSectionCalculator) delete crossSectionCalculator;
58 delete fCrossSectionCalculator; <<
59 } 80 }
60 81
61 //....oooOO0OOooo........oooOO0OOooo........oo 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
>> 83
62 void G4PolarizedGammaConversionModel::Initiali 84 void G4PolarizedGammaConversionModel::Initialise(const G4ParticleDefinition* pd,
63 << 85 const G4DataVector& dv)
64 { 86 {
65 G4BetheHeitlerModel::Initialise(pd, dv); << 87 G4BetheHeitlerModel::Initialise(pd,dv);
66 if(!fCrossSectionCalculator) << 88 if (!crossSectionCalculator)
67 fCrossSectionCalculator = new G4PolarizedG << 89 crossSectionCalculator = new G4PolarizedPairProductionCrossSection();
68 } 90 }
69 91
70 //....oooOO0OOooo........oooOO0OOooo........oo 92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71 void G4PolarizedGammaConversionModel::SampleSe << 93
72 std::vector<G4DynamicParticle*>* vdp, const << 94 void G4PolarizedGammaConversionModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
73 const G4DynamicParticle* dp, G4double tmin, << 95 const G4MaterialCutsCouple* couple,
>> 96 const G4DynamicParticle* dp,
>> 97 G4double tmin,
>> 98 G4double maxEnergy)
74 { 99 {
75 G4BetheHeitlerModel::SampleSecondaries(vdp, 100 G4BetheHeitlerModel::SampleSecondaries(vdp, couple, dp, tmin, maxEnergy);
76 << 101
77 if(vdp && vdp->size() > 0) << 102 if(vdp && vdp->size()>0) {
78 { <<
79 G4double gamEnergy0 = dp->GetKineticEnergy 103 G4double gamEnergy0 = dp->GetKineticEnergy();
80 G4double lepEnergy1 = (*vdp)[0]->GetKineti 104 G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy();
81 G4double sintheta = << 105 G4double sintheta = dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
82 dp->GetMomentumDirection().cross((*vdp)[ << 106 if (sintheta>1.) sintheta=1.;
83 if(sintheta > 1.) <<
84 sintheta = 1.; <<
85 107
86 G4StokesVector beamPol = G4StokesVector(dp << 108 G4StokesVector beamPol = dp->GetPolarization();
87 beamPol.SetPhoton(); 109 beamPol.SetPhoton();
88 110
89 // determine interaction plane 111 // determine interaction plane
90 G4ThreeVector nInteractionFrame = G4Polari << 112 G4ThreeVector nInteractionFrame =
91 dp->GetMomentumDirection(), (*vdp)[0]->G << 113 G4PolarizationHelper::GetFrame(dp->GetMomentumDirection(),
>> 114 (*vdp)[0]->GetMomentumDirection());
92 115
93 // transform polarization into interaction 116 // transform polarization into interaction frame
94 beamPol.InvRotateAz(nInteractionFrame, dp- << 117 beamPol.InvRotateAz(nInteractionFrame,dp->GetMomentumDirection());
95 118
96 // calculate polarization transfer << 119 // calulcate polarization transfer
97 fCrossSectionCalculator->SetMaterial( << 120 crossSectionCalculator->SetMaterial(GetCurrentElement()->GetN(), // number of nucleons
98 GetCurrentElement()->GetN(), // number << 121 GetCurrentElement()->GetZ(),
99 GetCurrentElement()->GetZ(), GetCurrentE << 122 GetCurrentElement()->GetfCoulomb());
100 fCrossSectionCalculator->Initialize(gamEne << 123 crossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta,
101 beamPo << 124 beamPol, G4StokesVector::ZERO);
102 << 125
103 // determine final state polarization << 126 // deterimine final state polarization
104 G4StokesVector lep1Pol = fCrossSectionCalc << 127 G4StokesVector lep1Pol = crossSectionCalculator->GetPol2();
105 lep1Pol.RotateAz(nInteractionFrame, (*vdp) << 128 lep1Pol.RotateAz(nInteractionFrame,(*vdp)[0]->GetMomentumDirection());
106 (*vdp)[0]->SetPolarization(lep1Pol.p1(), l << 129 (*vdp)[0]->SetPolarization(lep1Pol.p1(),
>> 130 lep1Pol.p2(),
>> 131 lep1Pol.p3());
107 132
108 size_t num = vdp->size(); 133 size_t num = vdp->size();
109 if(num != 2) << 134 if (num!=2) G4cout<<" WARNING "<<num<<" secondaries in polarized pairproduction not supported!\n";
110 { << 135 for (size_t i =1; i<num; ++i) {
111 G4ExceptionDescription ed; << 136 G4StokesVector lep2Pol = crossSectionCalculator->GetPol3();
112 ed << " WARNING " << num << 137 lep2Pol.RotateAz(nInteractionFrame,(*vdp)[i]->GetMomentumDirection());
113 << " secondaries in polarized pairpro << 138 (*vdp)[i]->SetPolarization(lep2Pol.p1(),
114 G4Exception("G4PolarizedGammaConversionM << 139 lep2Pol.p2(),
115 "pol018", JustWarning, ed); << 140 lep2Pol.p3());
116 } << 141
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 } 142 }
123 } 143 }
124 } 144 }
>> 145
>> 146 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
125 147