Geant4  10.01.p01
G4ePolarizedBremsstrahlungModel.cc
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26 // $Id: G4ePolarizedBremsstrahlungModel.cc 75601 2013-11-04 13:08:15Z gcosmo $
27 //
28 // -------------------------------------------------------------------
29 //
30 // GEANT4 Class file
31 //
32 //
33 // File name: G4ePolarizedBremsstrahlungModel
34 //
35 // Author: Karim Laihem
36 //
37 // Creation date: 12.03.2005
38 //
39 // Modifications:
40 // 19-08-06 addapted to accomodate geant481 structure
41 //
42 //
43 // Class Description:
44 //
45 //
46 // -------------------------------------------------------------------
47 //
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50 
54 #include "G4PolarizationHelper.hh"
55 
57  const G4ParticleDefinition* p, const G4String& nam)
58  : G4SeltzerBergerModel(p,nam),
59  crossSectionCalculator(0)
60 {
61 }
62 
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64 
66 {
68 }
69 
70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
71 
73  const G4DataVector& d)
74 {
78 }
79 
80 
81 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
82 
83 
84 void G4ePolarizedBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
85  const G4MaterialCutsCouple* couple,
86  const G4DynamicParticle* dp,
87  G4double tmin,
88  G4double maxEnergy)
89 {
90  G4SeltzerBergerModel::SampleSecondaries(vdp,couple,dp,tmin,maxEnergy);
91  G4int num = vdp->size();
92 
93  if(num > 0) {
94  G4double lepEnergy0 = dp->GetKineticEnergy();
95  G4double gamEnergy1 = (*vdp)[0]->GetKineticEnergy();
96  G4double sintheta = dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
97  if (sintheta>1.) sintheta=1.;
98 
99 
100  G4StokesVector beamPol = dp->GetPolarization();
101 
102  // determine interaction plane
103  G4ThreeVector nInteractionFrame =
106 
107  // transform polarization into interaction frame
108  beamPol.InvRotateAz(nInteractionFrame,dp->GetMomentumDirection());
109 
110  // calulcate polarization transfer
111  crossSectionCalculator->SetMaterial(GetCurrentElement()->GetN(), // number of nucleons
112  GetCurrentElement()->GetZ(),
113  GetCurrentElement()->GetfCoulomb());
114  crossSectionCalculator->Initialize(lepEnergy0, gamEnergy1, sintheta,
115  beamPol, G4StokesVector::ZERO);
116 
117  // deterimine final state polarization
119  newBeamPol.RotateAz(nInteractionFrame,
122 
123  if (num!=1) G4cout<<" WARNING "<<num<<" secondaries in polarized bremsstrahlung not supported!\n";
124  for (G4int i=0; i<num; i++) {
126  photonPol.SetPhoton();
127  photonPol.RotateAz(nInteractionFrame,(*vdp)[i]->GetMomentumDirection());
128  (*vdp)[i]->SetPolarization(photonPol.p1(),
129  photonPol.p2(),
130  photonPol.p3());
131  }
132  }
133  return;
134 }
135 // The emitted gamma energy is sampled using a parametrized formula
void ProposePolarization(const G4ThreeVector &dir)
virtual void Initialise(const G4ParticleDefinition *, const G4DataVector &)
G4double GetKineticEnergy() const
CLHEP::Hep3Vector G4ThreeVector
G4double p2() const
void SetMaterial(G4double A, G4double Z, G4double coul)
const G4ThreeVector & GetProposedMomentumDirection() const
int G4int
Definition: G4Types.hh:78
G4double p3() const
virtual G4StokesVector GetPol2()
G4GLOB_DLL std::ostream G4cout
virtual void SampleSecondaries(std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy)
const G4ThreeVector & GetMomentumDirection() const
static G4ThreeVector GetFrame(const G4ThreeVector &, const G4ThreeVector &)
G4double p1() const
G4ePolarizedBremsstrahlungModel(const G4ParticleDefinition *p=0, const G4String &nam="PolBrem")
virtual void Initialise(const G4ParticleDefinition *, const G4DataVector &)
void InvRotateAz(G4ThreeVector nInteractionFrame, G4ThreeVector particleDirection)
const G4ThreeVector & GetPolarization() const
virtual G4StokesVector GetPol3()
G4ParticleChangeForLoss * fParticleChange
double G4double
Definition: G4Types.hh:76
static const G4StokesVector ZERO
virtual void SampleSecondaries(std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double cutEnergy, G4double maxEnergy)
void RotateAz(G4ThreeVector nInteractionFrame, G4ThreeVector particleDirection)
virtual void Initialize(G4double, G4double, G4double, const G4StokesVector &p0, const G4StokesVector &p1, G4int flag=0)
const G4Element * GetCurrentElement() const
Definition: G4VEmModel.hh:448