Gabriele Cosmo
244 lines
7.3 KiB
C++
244 lines
7.3 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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// $Id: G4eBremsstrahlungModel.hh,v 1.22 2007/05/23 08:47:34 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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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: G4eBremsstrahlungModel
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//
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// Author: Vladimir Ivanchenko on base of Laszlo Urban code
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//
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// Creation date: 07.01.2002
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//
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// Modifications:
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//
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// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
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// 24-01-03 Make models region aware (V.Ivanchenko)
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// 13-02-03 Add name (V.Ivanchenko)
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// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
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// 07-02-06 public function ComputeCrossSectionPerAtom() (mma)
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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
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// -------------------------------------------------------------------
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//
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#ifndef G4eBremsstrahlungModel_h
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#define G4eBremsstrahlungModel_h 1
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#include "G4VEmModel.hh"
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class G4Element;
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class G4ParticleChangeForLoss;
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class G4eBremsstrahlungModel : public G4VEmModel
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{
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public:
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G4eBremsstrahlungModel(const G4ParticleDefinition* p = 0,
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const G4String& nam = "StandBrem");
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virtual ~G4eBremsstrahlungModel();
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virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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G4double MinEnergyCut(const G4ParticleDefinition*,
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const G4MaterialCutsCouple*);
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virtual G4double ComputeDEDXPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double cutEnergy);
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virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double tkin,
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G4double Z, G4double,
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G4double cut,
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G4double maxE = DBL_MAX);
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virtual G4double CrossSectionPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double cutEnergy,
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G4double maxEnergy);
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virtual 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);
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inline void SetLPMflag(G4bool val);
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inline G4bool LPMflag() const;
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inline void SetEnergyThreshold(G4double val);
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inline G4double EnergyThreshold() const;
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protected:
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inline G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
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G4double kineticEnergy);
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const G4Element* SelectRandomAtom(const G4MaterialCutsCouple* couple);
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private:
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void SetParticle(const G4ParticleDefinition* p);
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G4double ComputeBremLoss(G4double Z, G4double tkin, G4double cut);
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G4double PositronCorrFactorLoss(G4double Z, G4double tkin, G4double cut);
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G4double PositronCorrFactorSigma(G4double Z, G4double tkin, G4double cut);
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G4DataVector* ComputePartialSumSigma(const G4Material* material,
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G4double tkin, G4double cut);
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G4double SupressionFunction(const G4Material* material, G4double tkin,
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G4double gammaEnergy);
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inline G4double ScreenFunction1(G4double ScreenVariable);
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inline G4double ScreenFunction2(G4double ScreenVariable);
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// hide assignment operator
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G4eBremsstrahlungModel & operator=(const G4eBremsstrahlungModel &right);
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G4eBremsstrahlungModel(const G4eBremsstrahlungModel&);
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protected:
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const G4ParticleDefinition* particle;
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G4ParticleDefinition* theGamma;
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G4ParticleChangeForLoss* fParticleChange;
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G4double minThreshold;
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G4bool isElectron;
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private:
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G4double highKinEnergy;
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G4double lowKinEnergy;
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G4double probsup;
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G4double MigdalConstant;
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G4double LPMconstant;
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G4double highEnergyTh;
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G4bool theLPMflag;
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G4bool isInitialised;
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std::vector<G4DataVector*> partialSumSigma;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4eBremsstrahlungModel::ScreenFunction1(G4double ScreenVariable)
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// compute the value of the screening function 3*PHI1 - PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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else
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screenVal = 42.392 - ScreenVariable* (7.796 - 1.961*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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G4double G4eBremsstrahlungModel::ScreenFunction2(G4double ScreenVariable)
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// compute the value of the screening function 1.5*PHI1 - 0.5*PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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else
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screenVal = 41.734 - ScreenVariable* (6.484 - 1.250*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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G4double G4eBremsstrahlungModel::MaxSecondaryEnergy(
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const G4ParticleDefinition*,
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G4double kineticEnergy)
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{
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return kineticEnergy;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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void G4eBremsstrahlungModel::SetLPMflag(G4bool val)
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{
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theLPMflag = val;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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G4bool G4eBremsstrahlungModel::LPMflag() const
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{
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return theLPMflag;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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void G4eBremsstrahlungModel::SetEnergyThreshold(G4double val)
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{
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highEnergyTh = val;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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G4double G4eBremsstrahlungModel::EnergyThreshold() const
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{
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return highEnergyTh;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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