Gabriele Cosmo
205 lines
7.2 KiB
C++
205 lines
7.2 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: G4eBremsstrahlungRelModel
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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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// 15.07.18 introduced data structures to store LPM functions and element depen
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// dent data for faster run-time computation (see more in .cc M.Novak)
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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 G4eBremsstrahlungRelModel_h
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#define G4eBremsstrahlungRelModel_h 1
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#include "G4VEmModel.hh"
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class G4ParticleChangeForLoss;
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class G4eBremsstrahlungRelModel : public G4VEmModel {
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public:
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explicit G4eBremsstrahlungRelModel(const G4ParticleDefinition* p=nullptr,
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const G4String& nam="eBremLPM");
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~G4eBremsstrahlungRelModel() 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 ComputeDEDXPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double ekin,
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G4double cutEnergy) override;
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G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double ekin,
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G4double zet,
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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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G4double MinPrimaryEnergy(const G4Material*,
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const G4ParticleDefinition*,
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G4double cutEnergy) override;
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protected:
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virtual G4double ComputeDXSectionPerAtom(G4double gammaEnergy);
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void SetParticle(const G4ParticleDefinition* p);
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private:
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G4double ComputeBremLoss(G4double cutEnergy);
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G4double ComputeXSectionPerAtom(G4double cutEnergy);
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G4double ComputeRelDXSectionPerAtom(G4double gammaEnergy);
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// init special data per element i.e. per Z
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void InitialiseElementData();
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void ComputeLPMfunctions(G4double& funcXiS,
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G4double& funcGS,
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G4double& funcPhiS,
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const G4double egamma);
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// for evaluating screening related functions
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void ComputeScreeningFunctions(G4double& phi1,
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G4double& phi1m2,
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G4double& psi1,
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G4double& psi1m2,
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const G4double gam,
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const G4double eps);
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// hide assignment operator and cctr
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G4eBremsstrahlungRelModel& operator=
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(const G4eBremsstrahlungRelModel& right) = delete;
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G4eBremsstrahlungRelModel(const G4eBremsstrahlungRelModel&) = delete;
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private:
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G4bool fIsUseCompleteScreening = false;
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G4bool fIsInitializer = false;
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G4bool fUseLPM = true;
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protected:
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G4bool fIsElectron = true;
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G4bool fIsScatOffElectron = false;
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G4bool fIsLPMActive = false;
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//
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G4int fCurrentIZ = 0;
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const G4ParticleDefinition* fPrimaryParticle = nullptr;
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G4ParticleDefinition* fGammaParticle = nullptr;
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G4ParticleChangeForLoss* fParticleChange = nullptr;
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// cash
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G4double fPrimaryParticleMass = 0.;
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G4double fPrimaryKinEnergy = 0.;
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G4double fPrimaryTotalEnergy = 0.;
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G4double fDensityFactor = 0.;
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G4double fDensityCorr = 0.;
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G4double fLowestKinEnergy;
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// scattering off electrons
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G4double fNucTerm = 0.;
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G4double fSumTerm = 0.;
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private:
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// LPM related members
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G4double fLPMEnergyThreshold;
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G4double fLPMEnergy;
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protected:
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static const G4double gBremFactor;
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static const G4double gMigdalConstant;
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private:
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static const G4int gMaxZet;
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//
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static const G4double gLPMconstant;
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//
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static const G4double gXGL[8];
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static const G4double gWGL[8];
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static const G4double gFelLowZet[8];
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static const G4double gFinelLowZet[8];
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//
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struct ElementData {
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/** @brief \f$ \ln(Z) \f$ */
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G4double fLogZ;
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/** @brief \f$ \ln(Z)/3 + f_c \f$ */
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G4double fFz;
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/** @brief \f$ ((Fel-fc)+Finel*invZ)\f$ */
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G4double fZFactor1;
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/** @brief \f$ (Fel-fc)\f$ */
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G4double fZFactor11;
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/** @brief \f$ (1.0+invZ)/12 \f$ */
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G4double fZFactor2;
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// LPM variables
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G4double fVarS1;
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G4double fILVarS1;
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G4double fILVarS1Cond;
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// constant factors to the screening function evaluations
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G4double fGammaFactor;
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G4double fEpsilonFactor;
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};
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static std::vector<ElementData*> gElementData;
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};
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#endif
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