Gabriele Cosmo
266 lines
7.7 KiB
C++
266 lines
7.7 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: G4eBremsstrahlungRelModel.hh,v 1.10 2008/11/14 09:25:19 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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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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//
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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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#include "G4NistManager.hh"
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class G4ParticleChangeForLoss;
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class G4PhysicsVector;
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class G4eBremsstrahlungRelModel : public G4VEmModel
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{
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public:
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G4eBremsstrahlungRelModel(const G4ParticleDefinition* p = 0,
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const G4String& nam = "eBremRel");
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virtual ~G4eBremsstrahlungRelModel();
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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 cutEnergy,
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G4double maxEnergy = DBL_MAX);
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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 cutEnergy,
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G4double maxEnergy);
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virtual void SetupForMaterial(const G4ParticleDefinition*,
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const G4Material*,G4double);
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inline void SetLPMconstant(G4double val);
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inline G4double LPMconstant() 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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private:
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void InitialiseConstants();
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void CalcLPMFunctions(G4double gammaEnergy);
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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 ComputeRelDXSectionPerAtom(G4double gammaEnergy);
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void SetParticle(const G4ParticleDefinition* p);
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// * fast inline functions *
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inline void SetCurrentElement(const G4double);
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inline G4double Phi1(G4double,G4double);
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inline G4double Phi1M2(G4double,G4double);
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inline G4double Psi1(G4double,G4double);
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inline G4double Psi1M2(G4double,G4double);
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// hide assignment operator
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G4eBremsstrahlungRelModel & operator=(const G4eBremsstrahlungRelModel &right);
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G4eBremsstrahlungRelModel(const G4eBremsstrahlungRelModel&);
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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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static const G4double Fel_light[5];
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static const G4double Finel_light[5];
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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 Fel, Finel, fCoulomb, fMax;
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G4double densityFactor;
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G4double densityCorr;
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// LPM effect
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G4double lpmEnergy;
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G4PhysicsVector *fXiLPM, *fPhiLPM, *fGLPM;
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G4double xiLPM, phiLPM, gLPM;
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// critical gamma energies
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G4double klpm, kp;
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G4bool isElectron;
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private:
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// consts
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G4double highKinEnergy;
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G4double lowKinEnergy;
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G4double fMigdalConstant;
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G4double fLPMconstant;
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G4double bremFactor;
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G4double energyThresholdLPM;
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G4double facFel, facFinel;
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G4double preS1,logTwo;
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G4bool use_completescreening;
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G4bool isInitialised;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline void G4eBremsstrahlungRelModel::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 = G4int(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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if (iz <= 4) {
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Fel = Fel_light[iz];
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Finel = Finel_light[iz] ;
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}
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else {
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Fel = facFel - lnZ/3. ;
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Finel = facFinel - 2.*lnZ/3. ;
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}
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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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inline G4double
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G4eBremsstrahlungRelModel::MaxSecondaryEnergy(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 G4double G4eBremsstrahlungRelModel::Phi1(G4double gg, G4double)
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{
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// Thomas-Fermi FF from Tsai, eq.(3.38) for Z>=5
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return 20.863 - 2.*std::log(1. + sqr(0.55846*gg) )
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- 4.*( 1. - 0.6*std::exp(-0.9*gg) - 0.4*std::exp(-1.5*gg) );
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}
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inline G4double G4eBremsstrahlungRelModel::Phi1M2(G4double gg, G4double)
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{
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// Thomas-Fermi FF from Tsai, eq. (3.39) for Z>=5
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// return Phi1(gg,Z) -
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return 2./(3.*(1. + 6.5*gg +6.*gg*gg) );
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}
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inline G4double G4eBremsstrahlungRelModel::Psi1(G4double eps, G4double)
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{
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// Thomas-Fermi FF from Tsai, eq.(3.40) for Z>=5
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return 28.340 - 2.*std::log(1. + sqr(3.621*eps) )
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- 4.*( 1. - 0.7*std::exp(-8*eps) - 0.3*std::exp(-29.*eps) );
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}
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inline G4double G4eBremsstrahlungRelModel::Psi1M2(G4double eps, G4double)
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{
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// Thomas-Fermi FF from Tsai, eq. (3.41) for Z>=5
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return 2./(3.*(1. + 40.*eps +400.*eps*eps) );
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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void G4eBremsstrahlungRelModel::SetLPMconstant(G4double val)
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{
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fLPMconstant = val;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline
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G4double G4eBremsstrahlungRelModel::LPMconstant() const
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{
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return fLPMconstant;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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