Gabriele Cosmo
129 lines
5.2 KiB
C++
129 lines
5.2 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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//
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// Geant4 Class file
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//
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// File name: G4PolarizedPhotoElectricModel
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//
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// Author: Andreas Schaelicke & Karim Laihem
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//
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// Class Description:
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// Implementation of Photo electric effect
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// including polarization transfer from circularly polarised gammas
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#include "G4PolarizedPhotoElectricModel.hh"
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#include "G4DataVector.hh"
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#include "G4ParticleChangeForGamma.hh"
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#include "G4PolarizationHelper.hh"
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#include "G4PolarizedPhotoElectricXS.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4PolarizedPhotoElectricModel::G4PolarizedPhotoElectricModel(
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const G4ParticleDefinition*, const G4String& nam)
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: G4PEEffectFluoModel(nam)
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, fCrossSectionCalculator(nullptr)
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, fVerboseLevel(0)
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4PolarizedPhotoElectricModel::~G4PolarizedPhotoElectricModel()
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{
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if(fCrossSectionCalculator)
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delete fCrossSectionCalculator;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4PolarizedPhotoElectricModel::Initialise(const G4ParticleDefinition* pd,
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const G4DataVector& dv)
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{
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G4PEEffectFluoModel::Initialise(pd, dv);
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if(!fCrossSectionCalculator)
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fCrossSectionCalculator = new G4PolarizedPhotoElectricXS();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4PolarizedPhotoElectricModel::SampleSecondaries(
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std::vector<G4DynamicParticle*>* vdp, const G4MaterialCutsCouple* couple,
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const G4DynamicParticle* dp, G4double tmin, G4double maxEnergy)
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{
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G4PEEffectFluoModel::SampleSecondaries(vdp, couple, dp, tmin, maxEnergy);
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if(fVerboseLevel >= 1)
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{
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G4cout << "G4PolarizedPhotoElectricModel::SampleSecondaries" << G4endl;
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}
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if(vdp && !vdp->empty())
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{
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G4double gamEnergy0 = dp->GetKineticEnergy();
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G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy();
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G4double sintheta =
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dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
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if(sintheta > 1.)
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sintheta = 1.;
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G4StokesVector beamPol = G4StokesVector(dp->GetPolarization());
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beamPol.SetPhoton();
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// determine interaction plane
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G4ThreeVector nInteractionFrame = G4PolarizationHelper::GetFrame(
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dp->GetMomentumDirection(), (*vdp)[0]->GetMomentumDirection());
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if(dp->GetMomentumDirection()
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.cross((*vdp)[0]->GetMomentumDirection())
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.mag() < 1.e-10)
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{
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nInteractionFrame =
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G4PolarizationHelper::GetRandomFrame(dp->GetMomentumDirection());
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}
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// transform polarization into interaction frame
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beamPol.InvRotateAz(nInteractionFrame, dp->GetMomentumDirection());
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// calulcate polarization transfer
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fCrossSectionCalculator->SetMaterial(
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GetCurrentElement()->GetN(), // number of nucleons
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GetCurrentElement()->GetZ(), GetCurrentElement()->GetfCoulomb());
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fCrossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta,
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beamPol, G4StokesVector::ZERO);
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// determine final state polarization
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G4StokesVector lep1Pol = fCrossSectionCalculator->GetPol2();
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lep1Pol.RotateAz(nInteractionFrame, (*vdp)[0]->GetMomentumDirection());
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(*vdp)[0]->SetPolarization(lep1Pol.p1(), lep1Pol.p2(), lep1Pol.p3());
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if(vdp->size() != 1)
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{
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G4ExceptionDescription ed;
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ed << " WARNING " << vdp->size()
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<< " secondaries in polarized photo electric effect not supported!\n";
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G4Exception("G4PolarizedPhotoElectricModel::SampleSecondaries", "pol024",
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JustWarning, ed);
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}
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}
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}
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