Gabriele Cosmo
215 lines
6.8 KiB
C++
215 lines
6.8 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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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4IonYangFluctuationModel
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//
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// Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
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//
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// Creation date: 18 August 2000
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//
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// Modifications:
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// 18/08/2000 V.Ivanchenko First implementation
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// 04/09/2000 V.Ivanchenko Rename fluctuations
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// 03/10/2000 V.Ivanchenko CodeWizard clean up
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// 10/05/2001 V.Ivanchenko Clean up againist Linux compilation with -Wall
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//
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// -------------------------------------------------------------------
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// Class Description:
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//
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// The aproximation of additional ion energy loss fluctuations
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// Q.Yang et al., NIM B61(1991)149-155.
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//
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// Class Description: End
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4IonYangFluctuationModel.hh"
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#include "G4DynamicParticle.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4Material.hh"
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#include "globals.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4IonYangFluctuationModel::G4IonYangFluctuationModel(const G4String& name)
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: G4VLowEnergyModel(name)
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{;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4IonYangFluctuationModel::~G4IonYangFluctuationModel()
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{;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::TheValue(const G4DynamicParticle* particle,
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const G4Material* material)
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{
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G4double energy = particle->GetKineticEnergy() ;
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G4double mass = particle->GetMass() ;
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G4double charge = (particle->GetCharge())/eplus ;
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G4double q = YangFluctuationModel(material,energy,mass,charge) ;
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return q ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::TheValue(const G4ParticleDefinition* aParticle,
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const G4Material* material,
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G4double kineticEnergy)
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{
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G4double mass = aParticle->GetPDGMass() ;
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G4double charge = (aParticle->GetPDGCharge())/eplus ;
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G4double q = YangFluctuationModel(material,kineticEnergy,mass,charge);
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return q ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::HighEnergyLimit(const G4ParticleDefinition*,
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const G4Material*) const
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{
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return 1.0*TeV ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::LowEnergyLimit(const G4ParticleDefinition* ,
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const G4Material* ) const
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{
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return 0.0 ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::HighEnergyLimit(const G4ParticleDefinition* ) const
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{
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return 1.0*TeV ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::LowEnergyLimit(
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const G4ParticleDefinition* ) const
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{
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return 0.0 ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4IonYangFluctuationModel::IsInCharge(const G4DynamicParticle*,
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const G4Material* ) const
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{
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return true ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4IonYangFluctuationModel::IsInCharge(const G4ParticleDefinition* ,
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const G4Material* ) const
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{
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return true ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4IonYangFluctuationModel::YangFluctuationModel(const G4Material* material,
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G4double kineticEnergy,
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G4double particleMass,
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G4double charge) const
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{
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// The aproximation of energy loss fluctuations
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// Q.Yang et al., NIM B61(1991)149-155.
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// Reduced energy in MeV/AMU
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G4double energy = kineticEnergy *amu_c2/(particleMass*MeV) ;
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G4int i = 0 ;
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G4double factor = 1.0 ;
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// The index of set of parameters i = 0 for protons(hadrons) in gases
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// 1 for protons(hadrons) in solids
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// 2 for ions in atomic gases
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// 3 for ions in molecular gases
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// 4 for ions in solids
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static G4double b[5][4] = {
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{0.1014, 0.3700, 0.9642, 3.987},
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{0.1955, 0.6941, 2.522, 1.040},
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{0.05058, 0.08975, 0.1419, 10.80},
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{0.05009, 0.08660, 0.2751, 3.787},
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{0.01273, 0.03458, 0.3951, 3.812}
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} ;
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// protons (hadrons)
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if(1.5 > charge) {
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if( kStateGas != material->GetState() ) i = 1 ;
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// ions
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} else {
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G4double zeff = (material->GetElectronDensity())/
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(material->GetTotNbOfAtomsPerVolume()) ;
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factor = charge * std::pow(charge/zeff, 0.3333) ;
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if( kStateGas == material->GetState() ) {
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energy /= (charge * std::sqrt(charge)) ;
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if(1 == (material->GetNumberOfElements())) {
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i = 2 ;
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} else {
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i = 3 ;
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}
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} else {
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energy /= (charge * std::sqrt(charge*zeff)) ;
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i = 4 ;
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}
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}
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G4double x = b[i][2] * (1.0 - std::exp( - energy * b[i][3] )) ;
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G4double q = factor * x * b[i][0] /
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((energy - b[i][1])*(energy - b[i][1]) + x*x) ;
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return q ;
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}
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