Gabriele Cosmo
184 lines
5.4 KiB
C++
184 lines
5.4 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: G4eBremParametrizedModel
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// extention of standard G4eBremsstrahlungModel
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//
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// Author: Andreas Schaelicke
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//
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// Creation date: 28.03.2008
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//
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// Modifications:
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//
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//
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// Class Description:
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//
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// Implementation of energy loss for gamma emission by electrons and
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// positrons including an improved version of the LPM effect
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// -------------------------------------------------------------------
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//
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#ifndef G4eBremParametrizedModel_h
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#define G4eBremParametrizedModel_h 1
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#include "G4VEmModel.hh"
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#include "G4NistManager.hh"
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class G4ParticleChangeForLoss;
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class G4PhysicsVector;
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class G4eBremParametrizedModel : public G4VEmModel
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{
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public:
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explicit G4eBremParametrizedModel(const G4ParticleDefinition* p = nullptr,
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const G4String& nam = "eBremParam");
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~G4eBremParametrizedModel() 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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G4double MinEnergyCut(const G4ParticleDefinition*,
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const G4MaterialCutsCouple*) override;
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G4double ComputeDEDXPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double cutEnergy) override;
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G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double tkin,
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G4double Z, G4double,
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G4double cutEnergy,
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G4double maxEnergy = 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 cutEnergy,
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G4double maxEnergy) override;
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void SetupForMaterial(const G4ParticleDefinition*,
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const G4Material*,G4double) override;
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// hide assignment operator
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G4eBremParametrizedModel & operator=(const G4eBremParametrizedModel &right) = delete;
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G4eBremParametrizedModel(const G4eBremParametrizedModel&) = delete;
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private:
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void InitialiseConstants();
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G4double ComputeBremLoss(G4double cutEnergy);
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G4double ComputeXSectionPerAtom(G4double cutEnergy);
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G4double ComputeDXSectionPerAtom(G4double gammaEnergy);
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G4double ComputeParametrizedDXSectionPerAtom(G4double kineticEnergy,
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G4double gammaEnergy,
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G4double Z);
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void SetParticle(const G4ParticleDefinition* p);
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G4double ScreenFunction1(G4double ScreenVariable);
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G4double ScreenFunction2(G4double ScreenVariable);
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inline void SetCurrentElement(const G4double);
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protected:
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G4NistManager* nist;
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const G4ParticleDefinition* particle;
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G4ParticleDefinition* theGamma;
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G4ParticleChangeForLoss* fParticleChange;
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static const G4double xgi[8], wgi[8];
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G4double minThreshold;
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// cash
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G4double particleMass;
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G4double kinEnergy;
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G4double totalEnergy;
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G4double currentZ;
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G4double z13, z23, lnZ;
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G4double densityFactor;
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G4double densityCorr;
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G4double Fel, Finel;
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G4double facFel, facFinel;
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G4double fMax,fCoulomb;
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private:
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G4double lowKinEnergy;
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G4double fMigdalConstant;
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G4double bremFactor;
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G4bool isInitialised;
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protected:
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G4bool isElectron;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline void G4eBremParametrizedModel::SetCurrentElement(const G4double Z)
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{
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if(Z != currentZ) {
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currentZ = Z;
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G4int iz = G4lrint(Z);
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z13 = nist->GetZ13(iz);
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z23 = z13*z13;
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lnZ = nist->GetLOGZ(iz);
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Fel = facFel - lnZ/3. ;
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Finel = facFinel - 2.*lnZ/3. ;
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fCoulomb = GetCurrentElement()->GetfCoulomb();
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fMax = Fel-fCoulomb + Finel/currentZ + (1.+1./currentZ)/12.;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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