[819] | 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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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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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: G4PolarizedPEEffectCrossSection.cc,v 1.1 2007/11/01 17:29:09 schaelic Exp $ |
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[1007] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 28 | // |
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| 29 | // GEANT4 Class file |
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| 30 | // |
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| 31 | // |
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| 32 | // File name: G4PolarizedPEEffectCrossSection |
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| 33 | // |
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| 34 | // Author: Karim Laihem |
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| 35 | // |
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| 36 | // Creation date: 15.03.2007 |
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| 37 | // |
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| 38 | // Modifications: |
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| 39 | // 19-03-07 Modified to fit in g4.8.2 framework (A.Schaelicke) |
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| 40 | // |
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| 41 | // Class Description: |
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| 42 | // |
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| 43 | #include "G4PolarizedPEEffectCrossSection.hh" |
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| 44 | //#include "Randomize.hh" |
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| 45 | |
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| 46 | using namespace std; |
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| 47 | |
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| 48 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 49 | G4PolarizedPEEffectCrossSection::G4PolarizedPEEffectCrossSection() |
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| 50 | { |
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| 51 | cout<<"G4PolarizedPEEffectCrossSection() init\n"; |
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| 52 | |
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| 53 | } |
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| 54 | |
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| 55 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 56 | G4PolarizedPEEffectCrossSection::~G4PolarizedPEEffectCrossSection() |
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| 57 | {} |
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| 58 | |
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| 59 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 60 | void G4PolarizedPEEffectCrossSection::Initialize(G4double aGammaE, |
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| 61 | G4double aLept0E, |
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| 62 | G4double sinTheta, |
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| 63 | const G4StokesVector & beamPol, |
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| 64 | const G4StokesVector & /*p1*/, |
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| 65 | G4int /*flag*/) |
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| 66 | { |
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| 67 | // cout<<"G4PolarizedPEEffectCrossSection::Initialize()\n"; |
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| 68 | |
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| 69 | // G4StokesVector PolarizedPhotoElectricEffect::Transfer_G4StokesVector( |
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| 70 | // G4double aGammaE, // Incoming Primary Gamma Energy. |
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| 71 | // G4ThreeVector aGammaDir, // Incoming Primary Gamma Direction. |
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| 72 | // G4StokesVector beamPol, // Incoming Primary Gamma polarization. |
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| 73 | // G4double aLept0E, // The Lepton e- of interest Total energy. |
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| 74 | // G4ThreeVector aParticl_01_Dir, // The Lepton e- of interest direction. |
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| 75 | // G4double cos_aTetha_Angle // The lepton of interest Scattering angle. |
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| 76 | // ) |
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| 77 | |
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| 78 | // *********************************************************** |
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| 79 | // ************ added by Karim Polarization transfer to e- in PhotoelectricEffect. |
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| 80 | // ************ |
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| 81 | // *********************************************************** |
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| 82 | G4double Gfactor = aLept0E/electron_mass_c2+1; |
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| 83 | G4double Gfactor_2 = Gfactor * Gfactor; |
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| 84 | |
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| 85 | G4double BETA = sqrt(1. - 1./(Gfactor_2)); |
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| 86 | |
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| 87 | G4double Stokes_P3 = beamPol.z() ; |
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| 88 | |
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| 89 | G4double m0_c2 = electron_mass_c2; |
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| 90 | G4double Lept0E = aLept0E/m0_c2+1, Lept0E2 = Lept0E * Lept0E ; |
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| 91 | G4double GammaE = aGammaE/m0_c2; |
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| 92 | |
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| 93 | |
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| 94 | // G4double cosTheta = cos_aTetha_Angle; |
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| 95 | // G4double sinTheta = sqrt(1- cos_aTetha_Angle * cos_aTetha_Angle); |
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| 96 | G4double cosTheta = std::sqrt(1. - sinTheta*sinTheta); |
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| 97 | |
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| 98 | G4double D_Lepton0 = (1./GammaE) * ((2./(GammaE*Lept0E*(1-BETA*cosTheta)))-1.); |
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| 99 | |
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| 100 | G4double I_Lepton0 = 1.0+D_Lepton0; |
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| 101 | |
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| 102 | G4double A_Lepton0 = (Lept0E/(Lept0E+1))*(2.0/(GammaE*Lept0E) |
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| 103 | + BETA*cosTheta |
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| 104 | +(2.0/((GammaE*Lept0E2)*(1.0-BETA*cosTheta)))) / I_Lepton0 ; |
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| 105 | |
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| 106 | G4double B_Lepton0 = (Lept0E/(Lept0E+1.0)) * BETA * sinTheta * (2.0/(GammaE*Lept0E*(1-BETA*cosTheta))-1.0)/I_Lepton0; |
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| 107 | |
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| 108 | G4double Stokes_S1 = (Stokes_P3 * B_Lepton0) ; |
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| 109 | G4double Stokes_S2 = 0.; |
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| 110 | G4double Stokes_S3 = (Stokes_P3 * A_Lepton0) ; |
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| 111 | |
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| 112 | |
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| 113 | theFinalElectronPolarization.setX(Stokes_S1); |
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| 114 | theFinalElectronPolarization.setY(Stokes_S2); |
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| 115 | theFinalElectronPolarization.setZ(Stokes_S3); |
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| 116 | |
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| 117 | if((theFinalElectronPolarization.x()*theFinalElectronPolarization.x() |
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| 118 | + theFinalElectronPolarization.y()* theFinalElectronPolarization.y() |
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| 119 | + theFinalElectronPolarization.z()* theFinalElectronPolarization.z())>1) |
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| 120 | |
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| 121 | { |
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| 122 | cout<<"Warning: PhotoelectricEffect Problem in pol-transfer photon to lepton:Px2 + Py2 + Pz2 > 1"<<endl; |
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| 123 | cout<<"Polarization transfer forced to be total and similar as incoming Photo"<<endl; |
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| 124 | // *KL* Surprising if it arrives (never seen it up to now) |
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| 125 | theFinalElectronPolarization = beamPol; // suplement de securite |
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| 126 | // cout<<"PhotoEffect okay :" |
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| 127 | // <<"\t"<<(aLept0E-m0_c2)/aGammaE |
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| 128 | // <<"\t"<<aGammaE |
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| 129 | // <<"\t"<<aLept0E |
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| 130 | // <<"\t"<<cos_aTetha_Angle |
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| 131 | // <<"\t"<<beamPol |
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| 132 | // <<"\t"<<theFinalElectronPolarization |
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| 133 | // <<"\t"<<A_Lepton0 |
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| 134 | // <<endl; |
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| 135 | } |
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| 136 | } |
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| 137 | |
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| 138 | |
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| 139 | |
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| 140 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 141 | |
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| 142 | G4double G4PolarizedPEEffectCrossSection::XSection(const G4StokesVector & /*pol2*/, |
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| 143 | const G4StokesVector & /*pol3*/) |
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| 144 | { |
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| 145 | cout<<"ERROR dummy routine G4PolarizedPEEffectCrossSection::XSection() called\n"; |
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| 146 | return 0; |
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| 147 | } |
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| 148 | |
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| 149 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 150 | |
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| 151 | G4StokesVector G4PolarizedPEEffectCrossSection::GetPol2() |
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| 152 | { |
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| 153 | return theFinalElectronPolarization; |
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| 154 | } |
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| 155 | |
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| 156 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 157 | |
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| 158 | G4StokesVector G4PolarizedPEEffectCrossSection::GetPol3() |
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| 159 | { |
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| 160 | return G4StokesVector(); |
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| 161 | } |
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| 162 | |
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| 163 | |
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| 164 | |
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| 165 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 166 | |
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| 167 | |
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| 168 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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