Gabriele Cosmo
273 lines
7.9 KiB
C++
273 lines
7.9 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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//
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// GEANT4 Class header file
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//
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//
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// File name: G4WentzelVIModel
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//
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// Author: V.Ivanchenko
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//
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// Creation date: 09.04.2008 from G4MuMscModel
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//
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// Modifications:
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// 27-05-2010 V.Ivanchenko added G4WentzelOKandVIxSection class to
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// compute cross sections and sample scattering angle
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//
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// Class Description:
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//
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// Implementation of the model of multiple scattering based on
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// G.Wentzel, Z. Phys. 40 (1927) 590.
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// H.W.Lewis, Phys Rev 78 (1950) 526.
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// J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
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// L.Urban, CERN-OPEN-2006-077.
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// -------------------------------------------------------------------
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//
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#ifndef G4WentzelVIModel_h
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#define G4WentzelVIModel_h 1
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#include "G4VMscModel.hh"
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#include "G4MaterialCutsCouple.hh"
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#include "G4WentzelOKandVIxSection.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4WentzelVIModel : public G4VMscModel
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{
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public:
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explicit G4WentzelVIModel(G4bool comb=true, const G4String& nam = "WentzelVIUni");
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~G4WentzelVIModel() override;
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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 StartTracking(G4Track*) override;
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G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double KineticEnergy,
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G4double AtomicNumber,
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G4double AtomicWeight=0.,
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G4double cut = DBL_MAX,
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G4double emax= DBL_MAX) override;
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G4ThreeVector& SampleScattering(const G4ThreeVector&,
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G4double safety) override;
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G4double
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ComputeTruePathLengthLimit(const G4Track& track,
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G4double& currentMinimalStep) override;
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G4double ComputeGeomPathLength(G4double truePathLength) override;
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G4double ComputeTrueStepLength(G4double geomStepLength) override;
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// defines low energy limit on energy transfer to atomic electron
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void SetFixedCut(G4double);
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// low energy limit on energy transfer to atomic electron
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G4double GetFixedCut() const;
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// access to cross section class
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void SetWVICrossSection(G4WentzelOKandVIxSection*);
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G4WentzelOKandVIxSection* GetWVICrossSection();
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void SetUseSecondMoment(G4bool);
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G4bool UseSecondMoment() const;
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G4PhysicsTable* GetSecondMomentTable();
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G4double SecondMoment(const G4ParticleDefinition*,
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const G4MaterialCutsCouple*,
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G4double kineticEnergy);
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void SetSingleScatteringFactor(G4double);
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void DefineMaterial(const G4MaterialCutsCouple*);
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G4WentzelVIModel & operator=(const G4WentzelVIModel &right) = delete;
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G4WentzelVIModel(const G4WentzelVIModel&) = delete;
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protected:
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G4double ComputeTransportXSectionPerVolume(G4double cosTheta);
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inline void SetupParticle(const G4ParticleDefinition*);
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private:
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G4double ComputeSecondMoment(const G4ParticleDefinition*,
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G4double kineticEnergy);
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protected:
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G4WentzelOKandVIxSection* wokvi;
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const G4MaterialCutsCouple* currentCouple = nullptr;
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const G4Material* currentMaterial = nullptr;
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const G4ParticleDefinition* particle = nullptr;
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G4ParticleChangeForMSC* fParticleChange = nullptr;
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const G4DataVector* currentCuts = nullptr;
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G4PhysicsTable* fSecondMoments = nullptr;
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G4double lowEnergyLimit;
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G4double tlimitminfix;
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G4double ssFactor = 1.05;
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G4double invssFactor = 1.0;
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// cache kinematics
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G4double preKinEnergy = 0.0;
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G4double tPathLength = 0.0;
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G4double zPathLength = 0.0;
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G4double lambdaeff = 0.0;
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G4double currentRange = 0.0;
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G4double cosTetMaxNuc = 0.0;
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G4double fixedCut = -1.0;
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// cache kinematics
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G4double effKinEnergy = 0.0;
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// single scattering parameters
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G4double cosThetaMin = 1.0;
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G4double cosThetaMax = -1.0;
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G4double xtsec = 0.0;
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G4int currentMaterialIndex = 0;
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size_t idx2 = 0;
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// data for single scattering mode
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G4int nelments = 0;
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// flags
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G4bool singleScatteringMode;
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G4bool isCombined;
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G4bool useSecondMoment;
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std::vector<G4double> xsecn;
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std::vector<G4double> prob;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline void G4WentzelVIModel::SetupParticle(const G4ParticleDefinition* p)
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{
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// Initialise mass and charge
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if(p != particle) {
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particle = p;
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wokvi->SetupParticle(p);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4WentzelVIModel::SetFixedCut(G4double val)
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{
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fixedCut = val;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4WentzelVIModel::GetFixedCut() const
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{
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return fixedCut;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4WentzelVIModel::SetWVICrossSection(G4WentzelOKandVIxSection* ptr)
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{
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if(ptr != wokvi) {
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delete wokvi;
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wokvi = ptr;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4WentzelOKandVIxSection* G4WentzelVIModel::GetWVICrossSection()
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{
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return wokvi;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4WentzelVIModel::SetUseSecondMoment(G4bool val)
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{
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useSecondMoment = val;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4bool G4WentzelVIModel::UseSecondMoment() const
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{
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return useSecondMoment;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4PhysicsTable* G4WentzelVIModel::GetSecondMomentTable()
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{
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return fSecondMoments;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double
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G4WentzelVIModel::SecondMoment(const G4ParticleDefinition* part,
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const G4MaterialCutsCouple* couple,
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G4double ekin)
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{
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G4double x = 0.0;
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if(useSecondMoment) {
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DefineMaterial(couple);
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x = (fSecondMoments) ?
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(*fSecondMoments)[(*theDensityIdx)[currentMaterialIndex]]->Value(ekin, idx2)
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*(*theDensityFactor)[currentMaterialIndex]/(ekin*ekin)
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: ComputeSecondMoment(part, ekin);
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}
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return x;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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