Gabriele Cosmo
128 lines
4.1 KiB
C++
128 lines
4.1 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: G4BohrFluctuations.hh,v 1.3 2007/09/27 13:53:11 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: G4BohrFluctuations
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 02.04.2003
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//
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// Modifications:
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//
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// 16-10-03 Changed interface to Initialisation (V.Ivanchenko)
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//
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// Class Description:
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//
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// Implementation of Gaussion energy loss Fluctuations
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// -------------------------------------------------------------------
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//
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#ifndef G4BohrFluctuations_h
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#define G4BohrFluctuations_h 1
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#include "G4VEmFluctuationModel.hh"
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#include "G4Material.hh"
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#include "G4DynamicParticle.hh"
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class G4BohrFluctuations : public G4VEmFluctuationModel
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{
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public:
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G4BohrFluctuations(const G4String& nam = "BohrFluc");
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virtual ~G4BohrFluctuations();
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G4double SampleFluctuations(const G4Material*,
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const G4DynamicParticle*,
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G4double&,
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G4double&,
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G4double&);
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G4double Dispersion( const G4Material*,
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const G4DynamicParticle*,
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G4double&,
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G4double&);
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void InitialiseMe(const G4ParticleDefinition*);
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protected:
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private:
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// hide assignment operator
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G4BohrFluctuations & operator=(const G4BohrFluctuations &right);
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G4BohrFluctuations(const G4BohrFluctuations&);
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const G4ParticleDefinition* particle;
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G4double particleMass;
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G4double chargeSquare;
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G4double minNumberInteractionsBohr;
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G4double minFraction;
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G4double xmin;
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G4double minLoss;
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// cash
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G4double kineticEnergy;
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G4double beta2;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4BohrFluctuations::Dispersion(
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const G4Material* material,
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const G4DynamicParticle* dp,
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G4double& tmax,
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G4double& length)
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{
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if(!particle) InitialiseMe(dp->GetDefinition());
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G4double electronDensity = material->GetElectronDensity();
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kineticEnergy = dp->GetKineticEnergy();
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G4double etot = kineticEnergy + particleMass;
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beta2 = kineticEnergy*(kineticEnergy + 2.0*particleMass)/(etot*etot);
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G4double siga = (1.0/beta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
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* electronDensity * chargeSquare;
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return siga;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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