Gabriele Cosmo
147 lines
6.5 KiB
C++
147 lines
6.5 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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//
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// GEANT4 Class header file
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//
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//
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// File name: G4eDPWACoulombScatteringModel
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//
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// Author: Mihaly Novak
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//
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// Creation date: 02.07.2020
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//
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// Modifications:
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//
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// Class Description:
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//
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// e-/e+ Coulomb scattering model based on numerical Differential Cross Sections
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// (DCS) obtained by Dirac Partial Wave Analysis (DPWA) and supplied by the
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// G4eDPWAElasticDCS class.
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// The model contains the possibility to incorporate the effects of angular
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// deflections of sub-threshold ionisation intercations when it's described by
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// the condensed history model. Note, this must be inactivated (by setting the
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// `isscpcor` input argument of the CTR to false) when ionisation is described
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// with a classical, event by event based simulation model instead of usign the
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// condensed history approach (otherwise, the corresponding angular defelctions
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// will be "double counted").
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//
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// -------------------------------------------------------------------
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#ifndef G4eDPWACoulombScatteringModel_h
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#define G4eDPWACoulombScatteringModel_h 1
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#include "G4VEmModel.hh"
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#include "globals.hh"
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class G4eDPWAElasticDCS;
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class G4ParticleChangeForGamma;
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class G4ParticleDefinition;
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class G4DataVector;
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class G4eDPWACoulombScatteringModel : public G4VEmModel {
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public:
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/**
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* Constructor.
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*
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* @param[in] ismixed Indicates if the model is for mixed or for pure single
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* Coulomb scattering. Different type of tables are pre-
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* pared for sampling polar angle of Coulomb scattering
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* for mixed and for pure single scattering models: cosine
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* of the polar scattering angle can be sampled in a
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* restriced inteval (see mumin input parameter below).
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* @param[in] isscpcor Indicates if scattering power correction should be used.
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* Note, scattering power correction accounts the effects
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* angular deflections due to sub-threshold ionisations
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* when ionisation is described by using condensed history
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* model (should be active only in this case).
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* @param[in] mumin When the model is used for mixed simulation, Coulomb
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* scatterings, resulting in a minimum t_c polar angular
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* deflection, modelled explicitly. Therefore, cross
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* sections are computed, and angular deflections are
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* sampled ina resricted [\theta_c,\pi] interval. The
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* minimum of this interval is determined by the mumin
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* parameter as:
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* \mu_{min} = \mu(\theta_c)=0.5[1-\cos(\theta_c)]
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*/
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G4eDPWACoulombScatteringModel(G4bool ismixed=false, G4bool isscpcor=true,
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G4double mumin=0.0);
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~G4eDPWACoulombScatteringModel() override;
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//
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// Interface methods:
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void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
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void InitialiseLocal(const G4ParticleDefinition*, G4VEmModel*) override;
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G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*, G4double ekin,
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G4double Z, G4double A, G4double prodcut,
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G4double emax) 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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G4double MinPrimaryEnergy(const G4Material*, const G4ParticleDefinition*,
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G4double) override { return 10.0*CLHEP::eV; }
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void SetTheDCS(G4eDPWAElasticDCS* theDCS) { fTheDCS = theDCS; }
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G4eDPWAElasticDCS* GetTheDCS() { return fTheDCS; }
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private:
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// Indicates if the model is mixed: MSC for soft (theta<theta_c), Singe
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// Scattering(SS) for hard scatterings(theta>theta_c). SS otherwise.
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// Note, that while the model provides restricted (elastic and transport)
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// cross sections, it's responsible to handle, i.e. provide final state,
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// only for the Singe Scattering part in case of a mixed model.
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G4bool fIsMixedModel;
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// indicates if scattering power correction should be applied: correction due
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// to deflection in case of sub-threshold, inelastic interactions -> only in
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// case of condensed history simulation of inonisation!
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G4bool fIsScpCorrection;
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// mu(theta)=0.5[1-cos(theta)]: the model porvides final states \in [fMuMin,1]
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G4double fMuMin;
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// the object that provides cross sections and polar angle of scattering
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G4eDPWAElasticDCS* fTheDCS;
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// particle change
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G4ParticleChangeForGamma* fParticleChange;
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};
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#endif
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