Gabriele Cosmo
121 lines
5.0 KiB
C++
121 lines
5.0 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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// Geant4 Class file
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//
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// File name: G4PolarizedPhotoElectricXS
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//
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// Author: Karim Laihem
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#include "G4PolarizedPhotoElectricXS.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4PolarizedPhotoElectricXS::G4PolarizedPhotoElectricXS()
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{
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fFinalElectronPolarization = G4StokesVector::ZERO;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4PolarizedPhotoElectricXS::~G4PolarizedPhotoElectricXS() {}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4PolarizedPhotoElectricXS::Initialize(G4double aGammaE, 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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// Polarization transfer to e- in PhotoelectricEffect.
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G4double Gfactor = aLept0E / CLHEP::electron_mass_c2 + 1.;
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G4double Gfactor_2 = Gfactor * Gfactor;
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G4double beta = std::sqrt(1. - 1. / (Gfactor_2));
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G4double Stokes_P3 = beamPol.z();
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G4double Lept0E = aLept0E / CLHEP::electron_mass_c2 + 1.;
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G4double Lept0E2 = Lept0E * Lept0E;
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G4double GammaE = aGammaE / CLHEP::electron_mass_c2;
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G4double cosTheta = std::sqrt(1. - sinTheta * sinTheta);
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G4double I_Lepton0 =
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1.0 +
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(1. / GammaE) * ((2. / (GammaE * Lept0E * (1 - beta * cosTheta))) - 1.);
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G4double A_Lepton0 =
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(Lept0E / (Lept0E + 1)) *
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(2.0 / (GammaE * Lept0E) + beta * cosTheta +
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(2.0 / ((GammaE * Lept0E2) * (1.0 - beta * cosTheta)))) /
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I_Lepton0;
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G4double B_Lepton0 = (Lept0E / (Lept0E + 1.0)) * beta * sinTheta *
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(2.0 / (GammaE * Lept0E * (1 - beta * cosTheta)) - 1.0) /
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I_Lepton0;
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fFinalElectronPolarization.setX(Stokes_P3 * B_Lepton0);
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fFinalElectronPolarization.setY(0.);
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fFinalElectronPolarization.setZ(Stokes_P3 * A_Lepton0);
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if((fFinalElectronPolarization.x() * fFinalElectronPolarization.x() +
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fFinalElectronPolarization.y() * fFinalElectronPolarization.y() +
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fFinalElectronPolarization.z() * fFinalElectronPolarization.z()) > 1.)
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{
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G4ExceptionDescription ed;
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ed << "Warning: PhotoelectricEffect Problem in pol-transfer photon to "
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"lepton:Px2 + Py2 + Pz2 > 1\n";
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ed << "Polarization transfer forced to be total and similar as incoming "
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"Photo\n";
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G4Exception("G4PolarizedPhotoElectricXS::Initialize", "pol023", JustWarning,
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ed);
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fFinalElectronPolarization = beamPol; // to be safe
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double G4PolarizedPhotoElectricXS::XSection(const G4StokesVector& /*pol2*/,
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const G4StokesVector& /*pol3*/)
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{
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G4ExceptionDescription ed;
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ed << "ERROR dummy routine G4PolarizedPhotoElectricXS::XSection() "
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"called\n";
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G4Exception("G4PolarizedPhotoElectricXS::XSection", "pol024", FatalException,
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ed);
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return 0.;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4StokesVector G4PolarizedPhotoElectricXS::GetPol2()
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{
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return fFinalElectronPolarization;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4StokesVector G4PolarizedPhotoElectricXS::GetPol3()
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{
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return G4StokesVector();
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}
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