Gabriele Cosmo
156 lines
7.5 KiB
C++
156 lines
7.5 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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// | G4LowEPPolarizedComptonModel-- Geant4 Monash University |
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// | polarised low energy Compton scattering model. |
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// | J. M. C. Brown, Monash University, Australia |
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// | |
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// | |
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// *********************************************************************
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// | |
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// | The following is a Geant4 class to simulate the process of |
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// | bound electron Compton scattering. General code structure is |
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// | based on G4LowEnergyCompton.cc and |
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// | G4LivermorePolarizedComptonModel.cc. |
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// | Algorithms for photon energy, and ejected Compton electron |
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// | direction taken from: |
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// | |
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// | J. M. C. Brown, M. R. Dimmock, J. E. Gillam and D. M. Paganin, |
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// | "A low energy bound atomic electron Compton scattering model |
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// | for Geant4", NIMB, Vol. 338, 77-88, 2014. |
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// | |
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// | The author acknowledges the work of the Geant4 collaboration |
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// | in developing the following algorithms that have been employed |
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// | or adapeted for the present software: |
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// | |
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// | # sampling of photon scattering angle, |
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// | # target element selection in composite materials, |
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// | # target shell selection in element, |
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// | # and sampling of bound electron momentum from Compton profiles. |
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// | |
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// *********************************************************************
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// | |
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// | History: |
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// | -------- |
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// | |
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// | Jan. 2015 JMCB - 1st Version based on G4LowEPComptonModel |
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// | Feb. 2016 JMCB - Geant4 10.2 FPE fix for bug 1676 |
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// | Nov. 2016 JMCB - Polarisation tracking fix in collaboration |
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// | of Dr. Merlin Reynaard Kole, |
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// | University of Geneva |
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// | |
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// *********************************************************************
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#ifndef G4LowEPPolarizedComptonModel_h
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#define G4LowEPPolarizedComptonModel_h 1
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#include "G4VEmModel.hh"
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#include "G4PhysicsFreeVector.hh"
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#include <limits>
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#include "G4Electron.hh"
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#include "G4ParticleChangeForGamma.hh"
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#include "G4LossTableManager.hh"
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#include "G4VAtomDeexcitation.hh"
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#include "G4AtomicShell.hh"
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#include "G4Gamma.hh"
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#include "G4ShellData.hh"
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#include "G4DopplerProfile.hh"
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#include "G4Log.hh"
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#include "G4Exp.hh"
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#include "G4ForceCondition.hh"
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class G4ParticleChangeForGamma;
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class G4VAtomDeexcitation;
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class G4ShellData;
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class G4DopplerProfile;
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class G4LowEPPolarizedComptonModel : public G4VEmModel
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{
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public:
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explicit G4LowEPPolarizedComptonModel(const G4ParticleDefinition* p = nullptr,
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const G4String& nam = "LowEPComptonModel");
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virtual ~G4LowEPPolarizedComptonModel();
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void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
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void InitialiseLocal(const G4ParticleDefinition*,
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G4VEmModel* masterModel) override;
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void InitialiseForElement(const G4ParticleDefinition*, G4int Z) override;
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G4double ComputeCrossSectionPerAtom( const G4ParticleDefinition*,
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G4double kinEnergy,
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G4double Z,
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G4double A=0,
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G4double cut=0,
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G4double emax=DBL_MAX ) override;
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void SampleSecondaries(std::vector<G4DynamicParticle*>*,
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double tmin,
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G4double maxEnergy) override;
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G4LowEPPolarizedComptonModel & operator=(const G4LowEPPolarizedComptonModel &right) = delete;
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G4LowEPPolarizedComptonModel(const G4LowEPPolarizedComptonModel&) = delete;
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private:
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void ReadData(size_t Z, const char* path = 0);
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G4double ComputeScatteringFunction(G4double x, G4int Z);
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G4ThreeVector GetRandomPolarization(G4ThreeVector& direction0); // Random Polarization
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G4ThreeVector GetPerpendicularPolarization(const G4ThreeVector& direction0, const G4ThreeVector& polarization0) const;
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G4ThreeVector SetNewPolarization(G4double LowEPPCepsilon, G4double sinT2,
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G4double phi, G4double cosTheta);
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G4double SetPhi(G4double, G4double);
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void SystemOfRefChange(G4ThreeVector& direction0, G4ThreeVector& direction1,
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G4ThreeVector& polarization0, G4ThreeVector& polarization1);
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void SystemOfRefChangeElect(G4ThreeVector& pdirection, G4ThreeVector& edirection,
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G4ThreeVector& ppolarization);
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G4ThreeVector SetPerpendicularVector(G4ThreeVector& a);
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G4ParticleChangeForGamma* fParticleChange;
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G4VAtomDeexcitation* fAtomDeexcitation;
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static G4ShellData* shellData;
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static G4DopplerProfile* profileData;
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static const G4int maxZ = 99;
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static G4PhysicsFreeVector* data[100];
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static const G4double ScatFuncFitParam[101][9];
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G4int verboseLevel;
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G4bool isInitialised;
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};
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//****************************************************************************
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#endif
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