Gabriele Cosmo
167 lines
6.3 KiB
C++
167 lines
6.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// GEANT4 Class file
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//
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//
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// File name: G4PolarizedPEEffectCrossSection
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//
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// Author: Karim Laihem
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//
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// Creation date: 15.03.2007
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//
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// Modifications:
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// 19-03-07 Modified to fit in g4.8.2 framework (A.Schaelicke)
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//
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// Class Description:
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//
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#include "G4PolarizedPEEffectCrossSection.hh"
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#include "G4PhysicalConstants.hh"
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using namespace std;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4PolarizedPEEffectCrossSection::G4PolarizedPEEffectCrossSection()
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{
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cout<<"G4PolarizedPEEffectCrossSection() init\n";
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4PolarizedPEEffectCrossSection::~G4PolarizedPEEffectCrossSection()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4PolarizedPEEffectCrossSection::Initialize(G4double aGammaE,
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G4double aLept0E,
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G4double sinTheta,
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const G4StokesVector & beamPol,
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const G4StokesVector & /*p1*/,
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G4int /*flag*/)
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{
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// cout<<"G4PolarizedPEEffectCrossSection::Initialize()\n";
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// G4StokesVector PolarizedPhotoElectricEffect::Transfer_G4StokesVector(
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// G4double aGammaE, // Incoming Primary Gamma Energy.
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// G4ThreeVector aGammaDir, // Incoming Primary Gamma Direction.
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// G4StokesVector beamPol, // Incoming Primary Gamma polarization.
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// G4double aLept0E, // The Lepton e- of interest Total energy.
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// G4ThreeVector aParticl_01_Dir, // The Lepton e- of interest direction.
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// G4double cos_aTetha_Angle // The lepton of interest Scattering angle.
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// )
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// ***********************************************************
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// ************ added by Karim Polarization transfer to e- in PhotoelectricEffect.
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// ************
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// ***********************************************************
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G4double Gfactor = aLept0E/electron_mass_c2+1.;
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G4double Gfactor_2 = Gfactor * Gfactor;
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G4double BETA = sqrt(1. - 1./(Gfactor_2));
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G4double Stokes_P3 = beamPol.z() ;
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G4double m0_c2 = electron_mass_c2;
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G4double Lept0E = aLept0E/m0_c2+1., Lept0E2 = Lept0E * Lept0E ;
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G4double GammaE = aGammaE/m0_c2;
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// G4double cosTheta = cos_aTetha_Angle;
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// G4double sinTheta = sqrt(1- cos_aTetha_Angle * cos_aTetha_Angle);
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G4double cosTheta = std::sqrt(1. - sinTheta*sinTheta);
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G4double D_Lepton0 = (1./GammaE) * ((2./(GammaE*Lept0E*(1-BETA*cosTheta)))-1.);
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G4double I_Lepton0 = 1.0+D_Lepton0;
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G4double A_Lepton0 = (Lept0E/(Lept0E+1))*(2.0/(GammaE*Lept0E)
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+ BETA*cosTheta
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+(2.0/((GammaE*Lept0E2)*(1.0-BETA*cosTheta)))) / I_Lepton0 ;
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G4double B_Lepton0 = (Lept0E/(Lept0E+1.0)) * BETA * sinTheta * (2.0/(GammaE*Lept0E*(1-BETA*cosTheta))-1.0)/I_Lepton0;
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G4double Stokes_S1 = (Stokes_P3 * B_Lepton0) ;
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G4double Stokes_S2 = 0.;
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G4double Stokes_S3 = (Stokes_P3 * A_Lepton0) ;
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theFinalElectronPolarization.setX(Stokes_S1);
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theFinalElectronPolarization.setY(Stokes_S2);
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theFinalElectronPolarization.setZ(Stokes_S3);
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if((theFinalElectronPolarization.x()*theFinalElectronPolarization.x()
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+ theFinalElectronPolarization.y()* theFinalElectronPolarization.y()
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+ theFinalElectronPolarization.z()* theFinalElectronPolarization.z())>1)
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{
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cout<<"Warning: PhotoelectricEffect Problem in pol-transfer photon to lepton:Px2 + Py2 + Pz2 > 1"<<endl;
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cout<<"Polarization transfer forced to be total and similar as incoming Photo"<<endl;
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// *KL* Surprising if it arrives (never seen it up to now)
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theFinalElectronPolarization = beamPol; // suplement de securite
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// cout<<"PhotoEffect okay :"
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// <<"\t"<<(aLept0E-m0_c2)/aGammaE
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// <<"\t"<<aGammaE
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// <<"\t"<<aLept0E
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// <<"\t"<<cos_aTetha_Angle
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// <<"\t"<<beamPol
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// <<"\t"<<theFinalElectronPolarization
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// <<"\t"<<A_Lepton0
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// <<endl;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double G4PolarizedPEEffectCrossSection::XSection(const G4StokesVector & /*pol2*/,
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const G4StokesVector & /*pol3*/)
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{
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cout<<"ERROR dummy routine G4PolarizedPEEffectCrossSection::XSection() called\n";
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return 0.;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4StokesVector G4PolarizedPEEffectCrossSection::GetPol2()
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{
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return theFinalElectronPolarization;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4StokesVector G4PolarizedPEEffectCrossSection::GetPol3()
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{
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return G4StokesVector();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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