Import Geant4 11.0.0.beta source tree

2021-06-25 16:12:29 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+// -------------------------------------------------------------------
+//
+// Geant4 Class file
+//
+// File name:     G4PolarizedPhotoElectricModel
+//
+// Author:        Andreas Schaelicke & Karim Laihem
+//
+// Class Description:
+//   Implementation of Photo electric effect
+//   including polarization transfer from circularly polarised gammas
+
+#include "G4PolarizedPhotoElectricModel.hh"
+
+#include "G4DataVector.hh"
+#include "G4ParticleChangeForGamma.hh"
+#include "G4PolarizationHelper.hh"
+#include "G4PolarizedPhotoElectricXS.hh"
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+G4PolarizedPhotoElectricModel::G4PolarizedPhotoElectricModel(
+  const G4ParticleDefinition*, const G4String& nam)
+  : G4PEEffectFluoModel(nam)
+  , fCrossSectionCalculator(nullptr)
+  , fVerboseLevel(0)
+{}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+G4PolarizedPhotoElectricModel::~G4PolarizedPhotoElectricModel()
+{
+  if(fCrossSectionCalculator)
+    delete fCrossSectionCalculator;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+void G4PolarizedPhotoElectricModel::Initialise(const G4ParticleDefinition* pd,
+                                               const G4DataVector& dv)
+{
+  G4PEEffectFluoModel::Initialise(pd, dv);
+  if(!fCrossSectionCalculator)
+    fCrossSectionCalculator = new G4PolarizedPhotoElectricXS();
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+void G4PolarizedPhotoElectricModel::SampleSecondaries(
+  std::vector<G4DynamicParticle*>* vdp, const G4MaterialCutsCouple* couple,
+  const G4DynamicParticle* dp, G4double tmin, G4double maxEnergy)
+{
+  G4PEEffectFluoModel::SampleSecondaries(vdp, couple, dp, tmin, maxEnergy);
+
+  if(fVerboseLevel >= 1)
+  {
+    G4cout << "G4PolarizedPhotoElectricModel::SampleSecondaries" << G4endl;
+  }
+
+  if(vdp && !vdp->empty())
+  {
+    G4double gamEnergy0 = dp->GetKineticEnergy();
+    G4double lepEnergy1 = (*vdp)[0]->GetKineticEnergy();
+    G4double sintheta =
+      dp->GetMomentumDirection().cross((*vdp)[0]->GetMomentumDirection()).mag();
+    if(sintheta > 1.)
+      sintheta = 1.;
+
+    G4StokesVector beamPol = G4StokesVector(dp->GetPolarization());
+    beamPol.SetPhoton();
+
+    // determine interaction plane
+    G4ThreeVector nInteractionFrame = G4PolarizationHelper::GetFrame(
+      dp->GetMomentumDirection(), (*vdp)[0]->GetMomentumDirection());
+    if(dp->GetMomentumDirection()
+         .cross((*vdp)[0]->GetMomentumDirection())
+         .mag() < 1.e-10)
+    {
+      nInteractionFrame =
+        G4PolarizationHelper::GetRandomFrame(dp->GetMomentumDirection());
+    }
+
+    // transform polarization into interaction frame
+    beamPol.InvRotateAz(nInteractionFrame, dp->GetMomentumDirection());
+
+    // calulcate polarization transfer
+    fCrossSectionCalculator->SetMaterial(
+      GetCurrentElement()->GetN(),  // number of nucleons
+      GetCurrentElement()->GetZ(), GetCurrentElement()->GetfCoulomb());
+    fCrossSectionCalculator->Initialize(gamEnergy0, lepEnergy1, sintheta,
+                                        beamPol, G4StokesVector::ZERO);
+
+    // determine final state polarization
+    G4StokesVector lep1Pol = fCrossSectionCalculator->GetPol2();
+    lep1Pol.RotateAz(nInteractionFrame, (*vdp)[0]->GetMomentumDirection());
+    (*vdp)[0]->SetPolarization(lep1Pol.p1(), lep1Pol.p2(), lep1Pol.p3());
+
+    if(vdp->size() != 1)
+    {
+      G4ExceptionDescription ed;
+      ed << " WARNING " << vdp->size()
+         << " secondaries in polarized photo electric effect not supported!\n";
+      G4Exception("G4PolarizedPhotoElectricModel::SampleSecondaries", "pol024",
+                  JustWarning, ed);
+    }
+  }
+}