Gabriele Cosmo
202 lines
6.4 KiB
C++
202 lines
6.4 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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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: 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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// 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 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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~G4eBremsstrahlungModel();
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G4double HighEnergyLimit(const G4ParticleDefinition* p,
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const G4Material*);
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G4double LowEnergyLimit(const G4ParticleDefinition* p,
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const G4Material*);
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void SetHighEnergyLimit(const G4Material*, G4double e) {highKinEnergy = e;};
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void SetLowEnergyLimit(const G4Material*, G4double e) {lowKinEnergy = e;};
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G4double MinEnergyCut(const G4ParticleDefinition*,
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const G4Material*);
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G4bool IsInCharge(const G4ParticleDefinition*,
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const G4Material*);
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G4double ComputeDEDX(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 CrossSection(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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G4std::vector<G4DynamicParticle*>* SampleSecondary(
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const G4Material*,
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const G4DynamicParticle*,
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G4double tmin,
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G4double maxEnergy);
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void SetLPMflag(G4bool val) {theLPMflag = val;};
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G4bool LPMflag() const {return theLPMflag;};
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virtual G4double MaxSecondaryEnergy(
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const G4DynamicParticle* dynParticle);
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protected:
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virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
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G4double kineticEnergy);
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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, G4double x);
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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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G4double CrossSectionPerAtom(G4double tkin, G4double Z, G4double cut);
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void ComputePartialSumSigma(const G4Material* material, G4double tkin,
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G4double cut);
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const G4Element* SelectRandomAtom(const G4Material* material) const;
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G4double SupressionFunction(const G4Material* material, G4double tkin,
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G4double gammaEnergy);
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G4double ScreenFunction1(G4double ScreenVariable);
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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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const G4ParticleDefinition* particle;
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G4double highKinEnergy;
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G4double lowKinEnergy;
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G4double minThreshold;
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G4double probsup;
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G4double MigdalConstant;
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G4double LPMconstant;
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G4bool isElectron;
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G4bool theLPMflag;
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const G4Material* oldMaterial;
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G4std::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*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*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 G4DynamicParticle* dynParticle)
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{
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return dynParticle->GetKineticEnergy();
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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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#endif
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