[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // $Id: G4ePolarizedBremsstrahlungModel.cc,v 1.4 2007/11/01 17:32:34 schaelic Exp $ |
---|
[1007] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
---|
[819] | 28 | // |
---|
| 29 | // ------------------------------------------------------------------- |
---|
| 30 | // |
---|
| 31 | // GEANT4 Class file |
---|
| 32 | // |
---|
| 33 | // |
---|
| 34 | // File name: G4ePolarizedBremsstrahlungModel |
---|
| 35 | // |
---|
| 36 | // Author: Karim Laihem |
---|
| 37 | // |
---|
| 38 | // Creation date: 12.03.2005 |
---|
| 39 | // |
---|
| 40 | // Modifications: |
---|
| 41 | // 19-08-06 addapted to accomodate geant481 structure |
---|
| 42 | // |
---|
| 43 | // |
---|
| 44 | // Class Description: |
---|
| 45 | // |
---|
| 46 | // |
---|
| 47 | // ------------------------------------------------------------------- |
---|
| 48 | // |
---|
| 49 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 50 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 51 | |
---|
| 52 | #include "G4ePolarizedBremsstrahlungModel.hh" |
---|
| 53 | #include "G4PolarizedBremsstrahlungCrossSection.hh" |
---|
| 54 | #include "G4ParticleChangeForLoss.hh" |
---|
| 55 | #include "G4PolarizationHelper.hh" |
---|
| 56 | |
---|
| 57 | G4ePolarizedBremsstrahlungModel::G4ePolarizedBremsstrahlungModel(const G4ParticleDefinition* p, |
---|
| 58 | const G4String& nam) |
---|
| 59 | : G4eBremsstrahlungModel(p,nam), |
---|
| 60 | crossSectionCalculator(0) |
---|
| 61 | { |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 65 | |
---|
| 66 | G4ePolarizedBremsstrahlungModel::~G4ePolarizedBremsstrahlungModel() |
---|
| 67 | { |
---|
| 68 | if (crossSectionCalculator) delete crossSectionCalculator; |
---|
| 69 | } |
---|
| 70 | |
---|
| 71 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 72 | |
---|
| 73 | void G4ePolarizedBremsstrahlungModel::Initialise(const G4ParticleDefinition* p, |
---|
| 74 | const G4DataVector& d) |
---|
| 75 | { |
---|
| 76 | G4eBremsstrahlungModel::Initialise(p,d); |
---|
| 77 | if (!crossSectionCalculator) |
---|
| 78 | crossSectionCalculator = new G4PolarizedBremsstrahlungCrossSection(); |
---|
| 79 | } |
---|
| 80 | |
---|
| 81 | |
---|
| 82 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
| 83 | |
---|
| 84 | |
---|
| 85 | void G4ePolarizedBremsstrahlungModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp, |
---|
| 86 | const G4MaterialCutsCouple* couple, |
---|
| 87 | const G4DynamicParticle* dp, |
---|
| 88 | G4double tmin, |
---|
| 89 | G4double maxEnergy) |
---|
| 90 | { |
---|
| 91 | G4eBremsstrahlungModel::SampleSecondaries(vdp,couple,dp,tmin,maxEnergy); |
---|
| 92 | G4int num = vdp->size(); |
---|
| 93 | |
---|
| 94 | if(num > 0) { |
---|
| 95 | G4double lepEnergy0 = dp->GetKineticEnergy(); |
---|
| 96 | G4double gamEnergy1 = (*vdp)[0]->GetKineticEnergy(); |
---|
| 97 | G4double sintheta = dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag(); |
---|
| 98 | if (sintheta>1.) sintheta=1.; |
---|
| 99 | |
---|
| 100 | |
---|
| 101 | G4StokesVector beamPol = dp->GetPolarization(); |
---|
| 102 | |
---|
| 103 | // determine interaction plane |
---|
| 104 | G4ThreeVector nInteractionFrame = |
---|
| 105 | G4PolarizationHelper::GetFrame(dp->GetMomentumDirection(), |
---|
| 106 | fParticleChange->GetProposedMomentumDirection()); |
---|
| 107 | |
---|
| 108 | // transform polarization into interaction frame |
---|
| 109 | beamPol.InvRotateAz(nInteractionFrame,dp->GetMomentumDirection()); |
---|
| 110 | |
---|
| 111 | // calulcate polarization transfer |
---|
| 112 | crossSectionCalculator->SetMaterial(GetCurrentElement()->GetN(), // number of nucleons |
---|
| 113 | GetCurrentElement()->GetZ(), |
---|
| 114 | GetCurrentElement()->GetfCoulomb()); |
---|
| 115 | crossSectionCalculator->Initialize(lepEnergy0, gamEnergy1, sintheta, |
---|
| 116 | beamPol, G4StokesVector::ZERO); |
---|
| 117 | |
---|
| 118 | // deterimine final state polarization |
---|
| 119 | G4StokesVector newBeamPol = crossSectionCalculator->GetPol2(); |
---|
| 120 | newBeamPol.RotateAz(nInteractionFrame, |
---|
| 121 | fParticleChange->GetProposedMomentumDirection()); |
---|
| 122 | fParticleChange->ProposePolarization(newBeamPol); |
---|
| 123 | |
---|
| 124 | if (num!=1) G4cout<<" WARNING "<<num<<" secondaries in polarized bremsstrahlung not supported!\n"; |
---|
| 125 | for (G4int i=0; i<num; i++) { |
---|
| 126 | G4StokesVector photonPol = crossSectionCalculator->GetPol3(); |
---|
| 127 | photonPol.SetPhoton(); |
---|
| 128 | photonPol.RotateAz(nInteractionFrame,(*vdp)[i]->GetMomentumDirection()); |
---|
| 129 | (*vdp)[i]->SetPolarization(photonPol.p1(), |
---|
| 130 | photonPol.p2(), |
---|
| 131 | photonPol.p3()); |
---|
| 132 | } |
---|
| 133 | } |
---|
| 134 | return; |
---|
| 135 | } |
---|
| 136 | // The emitted gamma energy is sampled using a parametrized formula |
---|