Gabriele Cosmo
214 lines
6.8 KiB
C++
214 lines
6.8 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
// $Id: G4BetheBlochModel.hh,v 1.20 2009/04/23 17:44:43 vnivanch Exp $
|
|
// GEANT4 tag $Name: geant4-09-03 $
|
|
//
|
|
// -------------------------------------------------------------------
|
|
//
|
|
// GEANT4 Class header file
|
|
//
|
|
//
|
|
// File name: G4BetheBlochModel
|
|
//
|
|
// Author: Vladimir Ivanchenko on base of Laszlo Urban code
|
|
//
|
|
// Creation date: 03.01.2002
|
|
//
|
|
// Modifications:
|
|
//
|
|
// 23-12-02 V.Ivanchenko change interface in order to moveto cut per region
|
|
// 24-01-03 Make models region aware (V.Ivanchenko)
|
|
// 13-02-03 Add name (V.Ivanchenko)
|
|
// 12-11-03 Fix for GenericIons (V.Ivanchenko)
|
|
// 24-03-05 Add G4EmCorrections (V.Ivanchenko)
|
|
// 11-04-05 Major optimisation of internal interfaces (V.Ivanchenko)
|
|
// 11-04-04 Move MaxSecondaryEnergy to models (V.Ivanchenko)
|
|
// 11-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
|
|
// 12-08-08 Added methods GetParticleCharge, GetChargeSquareRatio,
|
|
// CorrectionsAlongStep needed for ions(V.Ivanchenko)
|
|
|
|
//
|
|
// Class Description:
|
|
//
|
|
// Implementation of Bethe-Bloch model of energy loss and
|
|
// delta-electron production by heavy charged particles
|
|
|
|
// -------------------------------------------------------------------
|
|
//
|
|
|
|
#ifndef G4BetheBlochModel_h
|
|
#define G4BetheBlochModel_h 1
|
|
|
|
#include "G4VEmModel.hh"
|
|
#include "G4NistManager.hh"
|
|
|
|
class G4EmCorrections;
|
|
class G4ParticleChangeForLoss;
|
|
|
|
class G4BetheBlochModel : public G4VEmModel
|
|
{
|
|
|
|
public:
|
|
|
|
G4BetheBlochModel(const G4ParticleDefinition* p = 0,
|
|
const G4String& nam = "BetheBloch");
|
|
|
|
virtual ~G4BetheBlochModel();
|
|
|
|
virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
|
|
|
|
virtual G4double MinEnergyCut(const G4ParticleDefinition*,
|
|
const G4MaterialCutsCouple*);
|
|
|
|
virtual G4double ComputeCrossSectionPerElectron(
|
|
const G4ParticleDefinition*,
|
|
G4double kineticEnergy,
|
|
G4double cutEnergy,
|
|
G4double maxEnergy);
|
|
|
|
virtual G4double ComputeCrossSectionPerAtom(
|
|
const G4ParticleDefinition*,
|
|
G4double kineticEnergy,
|
|
G4double Z, G4double A,
|
|
G4double cutEnergy,
|
|
G4double maxEnergy);
|
|
|
|
virtual G4double CrossSectionPerVolume(const G4Material*,
|
|
const G4ParticleDefinition*,
|
|
G4double kineticEnergy,
|
|
G4double cutEnergy,
|
|
G4double maxEnergy);
|
|
|
|
virtual G4double ComputeDEDXPerVolume(const G4Material*,
|
|
const G4ParticleDefinition*,
|
|
G4double kineticEnergy,
|
|
G4double cutEnergy);
|
|
|
|
virtual G4double GetChargeSquareRatio(const G4ParticleDefinition* p,
|
|
const G4Material* mat,
|
|
G4double kineticEnergy);
|
|
|
|
virtual G4double GetParticleCharge(const G4ParticleDefinition* p,
|
|
const G4Material* mat,
|
|
G4double kineticEnergy);
|
|
|
|
virtual void CorrectionsAlongStep(const G4MaterialCutsCouple*,
|
|
const G4DynamicParticle*,
|
|
G4double& eloss,
|
|
G4double& niel,
|
|
G4double length);
|
|
|
|
virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
|
|
const G4MaterialCutsCouple*,
|
|
const G4DynamicParticle*,
|
|
G4double tmin,
|
|
G4double maxEnergy);
|
|
|
|
protected:
|
|
|
|
virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
|
|
G4double kinEnergy);
|
|
|
|
private:
|
|
|
|
inline void SetupParameters();
|
|
|
|
inline void SetParticle(const G4ParticleDefinition* p);
|
|
|
|
inline void SetGenericIon(const G4ParticleDefinition* p);
|
|
|
|
// hide assignment operator
|
|
G4BetheBlochModel & operator=(const G4BetheBlochModel &right);
|
|
G4BetheBlochModel(const G4BetheBlochModel&);
|
|
|
|
const G4ParticleDefinition* particle;
|
|
const G4Material* currentMaterial;
|
|
G4ParticleDefinition* theElectron;
|
|
G4EmCorrections* corr;
|
|
G4ParticleChangeForLoss* fParticleChange;
|
|
G4NistManager* nist;
|
|
|
|
G4double mass;
|
|
G4double tlimit;
|
|
G4double spin;
|
|
G4double magMoment2;
|
|
G4double chargeSquare;
|
|
G4double ratio;
|
|
G4double formfact;
|
|
G4double twoln10;
|
|
G4double bg2lim;
|
|
G4double taulim;
|
|
G4double corrFactor;
|
|
G4bool isIon;
|
|
G4bool isInitialised;
|
|
};
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
inline void G4BetheBlochModel::SetupParameters()
|
|
{
|
|
mass = particle->GetPDGMass();
|
|
spin = particle->GetPDGSpin();
|
|
G4double q = particle->GetPDGCharge()/eplus;
|
|
chargeSquare = q*q;
|
|
ratio = electron_mass_c2/mass;
|
|
G4double magmom = particle->GetPDGMagneticMoment()*mass/(0.5*eplus*hbar_Planck*c_squared);
|
|
magMoment2 = magmom*magmom - 1.0;
|
|
formfact = 0.0;
|
|
if(particle->GetLeptonNumber() == 0) {
|
|
G4double x = 0.8426*GeV;
|
|
if(spin == 0.0 && mass < GeV) {x = 0.736*GeV;}
|
|
else if(mass > GeV) {
|
|
x /= nist->GetZ13(mass/proton_mass_c2);
|
|
// tlimit = 51.2*GeV*A13[iz]*A13[iz];
|
|
}
|
|
formfact = 2.0*electron_mass_c2/(x*x);
|
|
tlimit = 2.0/formfact;
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
inline void G4BetheBlochModel::SetParticle(const G4ParticleDefinition* p)
|
|
{
|
|
if(particle != p) {
|
|
particle = p;
|
|
if (p->GetPDGCharge()/eplus > 1.5 && p->GetBaryonNumber() > 2) isIon = true;
|
|
SetupParameters();
|
|
}
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
inline void G4BetheBlochModel::SetGenericIon(const G4ParticleDefinition* p)
|
|
{
|
|
if(p && particle != p) {
|
|
if(p->GetParticleName() == "GenericIon") isIon = true;
|
|
}
|
|
}
|
|
|
|
#endif
|