Gabriele Cosmo
179 lines
6.1 KiB
C++
179 lines
6.1 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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// -------------------------------------------------------------------
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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: G4hIonisation
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//
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// Author: Laszlo Urban
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//
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// Creation date: 30.05.1997
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//
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// Modified by Laszlo Urban, Michel Maire and Vladimir Ivanchenko
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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 "G4hIonisation.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Electron.hh"
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#include "G4Proton.hh"
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#include "G4AntiProton.hh"
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#include "G4BraggModel.hh"
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#include "G4BetheBlochModel.hh"
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#include "G4EmStandUtil.hh"
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#include "G4PionPlus.hh"
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#include "G4PionMinus.hh"
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#include "G4KaonPlus.hh"
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#include "G4KaonMinus.hh"
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#include "G4ICRU73QOModel.hh"
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#include "G4EmParameters.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4hIonisation::G4hIonisation(const G4String& name)
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: G4VEnergyLossProcess(name),
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isInitialised(false)
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{
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SetProcessSubType(fIonisation);
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SetSecondaryParticle(G4Electron::Electron());
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mass = 0.0;
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ratio = 0.0;
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eth = 2*CLHEP::MeV;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4hIonisation::~G4hIonisation() = default;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4hIonisation::IsApplicable(const G4ParticleDefinition&)
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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 G4hIonisation::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 gam = x*ratio + std::sqrt((1. + x)*(1. + x*ratio*ratio));
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return mass*(gam - 1.0);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4hIonisation::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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const G4ParticleDefinition* theBaseParticle = nullptr;
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G4String pname = part->GetParticleName();
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G4double q = part->GetPDGCharge();
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//G4cout << " G4hIonisation::InitialiseEnergyLossProcess " << pname
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// << " " << bpart << G4endl;
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// define base particle
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if(part == bpart) {
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theBaseParticle = nullptr;
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} else if(nullptr != bpart) {
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theBaseParticle = bpart;
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} else if(pname == "proton" || pname == "anti_proton" ||
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pname == "pi+" || pname == "pi-" ||
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pname == "kaon+" || pname == "kaon-" ||
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pname == "GenericIon" || pname == "alpha") {
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// no base particles
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theBaseParticle = nullptr;
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} else {
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// select base particle
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if(part->GetPDGSpin() == 0.0) {
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if(q > 0.0) { theBaseParticle = G4KaonPlus::KaonPlus(); }
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else { theBaseParticle = G4KaonMinus::KaonMinus(); }
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} else {
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if(q > 0.0) { theBaseParticle = G4Proton::Proton(); }
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else { theBaseParticle = G4AntiProton::AntiProton(); }
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}
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}
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SetBaseParticle(theBaseParticle);
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mass = part->GetPDGMass();
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ratio = electron_mass_c2/mass;
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eth = 2.0*MeV*mass/proton_mass_c2;
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G4EmParameters* param = G4EmParameters::Instance();
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G4double emin = std::min(param->MinKinEnergy(), 0.1*eth);
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G4double emax = std::max(param->MaxKinEnergy(), 10*eth);
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if(emin != param->MinKinEnergy() || emax != param->MaxKinEnergy()) {
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SetMinKinEnergy(emin);
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SetMaxKinEnergy(emax);
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}
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if (nullptr == EmModel(0)) {
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if(q > 0.0) { SetEmModel(new G4BraggModel()); }
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else { SetEmModel(new G4ICRU73QOModel()); }
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}
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EmModel(0)->SetLowEnergyLimit(emin);
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EmModel(0)->SetHighEnergyLimit(eth);
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if (nullptr == FluctModel()) {
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G4bool ion = (pname == "GenericIon" || pname == "alpha");
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SetFluctModel(G4EmStandUtil::ModelOfFluctuations(ion));
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}
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AddEmModel(1, EmModel(0), FluctModel());
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if (nullptr == EmModel(1)) { SetEmModel(new G4BetheBlochModel()); }
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EmModel(1)->SetLowEnergyLimit(eth);
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EmModel(1)->SetHighEnergyLimit(emax);
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AddEmModel(1, EmModel(1), FluctModel());
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isInitialised = true;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4hIonisation::ProcessDescription(std::ostream& out) const
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{
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out << " Ionisation";
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G4VEnergyLossProcess::ProcessDescription(out);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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