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