Gabriele Cosmo
159 lines
5.4 KiB
C++
159 lines
5.4 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: G4alphaIonisation.cc,v 1.1 2009/11/10 11:50:30 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-03 $
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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: G4alphaIonisation
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 28.10.2009 created from G4ionIonisation
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//
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// Modifications:
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//
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//
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4alphaIonisation.hh"
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#include "G4Electron.hh"
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#include "G4Alpha.hh"
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#include "G4BraggIonModel.hh"
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#include "G4BetheBlochModel.hh"
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#include "G4UnitsTable.hh"
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#include "G4LossTableManager.hh"
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#include "G4IonFluctuations.hh"
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#include "G4UniversalFluctuation.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4alphaIonisation::G4alphaIonisation(const G4String& name)
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: G4VEnergyLossProcess(name),
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theParticle(0),
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isInitialised(false),
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nuclearStopping(true)
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{
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// SetLinearLossLimit(0.15);
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SetStepFunction(0.2, 0.1*mm);
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// SetIntegral(true);
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SetProcessSubType(fIonisation);
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// SetVerboseLevel(1);
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mass = 0.0;
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ratio = 0.0;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4alphaIonisation::~G4alphaIonisation()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4alphaIonisation::IsApplicable(const G4ParticleDefinition& p)
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{
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return (p.GetPDGCharge() == 2*eplus);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4alphaIonisation::MinPrimaryEnergy(const G4ParticleDefinition*,
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const G4Material*,
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G4double cut)
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{
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G4double x = 0.5*cut/electron_mass_c2;
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G4double g = x*ratio + std::sqrt((1. + x)*(1. + x*ratio*ratio));
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return mass*(g - 1.0);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4alphaIonisation::InitialiseEnergyLossProcess(
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const G4ParticleDefinition* part,
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const G4ParticleDefinition* bpart)
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{
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if(!isInitialised) {
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theParticle = part;
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G4String pname = part->GetParticleName();
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// define base particle
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const G4ParticleDefinition* theBaseParticle = 0;
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if(bpart == 0) {
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if(pname != "alpha") { theBaseParticle = G4Alpha::Alpha(); }
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} else { theBaseParticle = bpart; }
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mass = part->GetPDGMass();
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ratio = electron_mass_c2/mass;
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SetBaseParticle(theBaseParticle);
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SetSecondaryParticle(G4Electron::Electron());
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if (!EmModel(1)) SetEmModel(new G4BraggIonModel(), 1);
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EmModel(1)->SetLowEnergyLimit(MinKinEnergy());
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// model limit defined for alpha
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eth = (EmModel(1)->HighEnergyLimit())*mass/proton_mass_c2;
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EmModel(1)->SetHighEnergyLimit(eth);
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if (!FluctModel()) SetFluctModel(new G4UniversalFluctuation());
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AddEmModel(1, EmModel(1), new G4IonFluctuations());
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if (!EmModel(2)) SetEmModel(new G4BetheBlochModel(),2);
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EmModel(2)->SetLowEnergyLimit(eth);
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EmModel(2)->SetHighEnergyLimit(MaxKinEnergy());
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AddEmModel(2, EmModel(2), FluctModel());
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isInitialised = true;
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}
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// reinitialisation of corrections for the new run
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EmModel(1)->ActivateNuclearStopping(nuclearStopping);
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EmModel(2)->ActivateNuclearStopping(nuclearStopping);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4alphaIonisation::PrintInfo()
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{
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if (G4Alpha::Alpha() == theParticle) {
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if(EmModel(1) && EmModel(2)) {
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G4cout << " NuclearStopping= " << nuclearStopping
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<< G4endl;
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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