Gabriele Cosmo
167 lines
5.9 KiB
C++
167 lines
5.9 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: G4ionGasIonisation.cc,v 1.3 2007/11/09 11:45:45 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 file
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//
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//
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// File name: G4ionGasIonisation
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 23.07.2007
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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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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4ionGasIonisation.hh"
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#include "G4Electron.hh"
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#include "G4Proton.hh"
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#include "G4GenericIon.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4ionGasIonisation::G4ionGasIonisation(const G4String& name)
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: G4ionIonisation(name),
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currParticle(0),
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baseParticle(0),
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initialised(false)
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{
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atomXS = CLHEP::pi*CLHEP::Bohr_radius*CLHEP::Bohr_radius;
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verboseLevel = 1;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4ionGasIonisation::~G4ionGasIonisation()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4ionGasIonisation::InitialiseEnergyLossProcess(
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const G4ParticleDefinition* part,
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const G4ParticleDefinition* bpart)
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{
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G4ionIonisation::InitialiseEnergyLossProcess(part, bpart);
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if(initialised) return;
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currParticle = part;
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if(part == bpart || part == G4GenericIon::GenericIon()) baseParticle = 0;
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else if(bpart == 0) baseParticle = G4GenericIon::GenericIon();
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else baseParticle = bpart;
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if(baseParticle) basePartMass = baseParticle->GetPDGMass();
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else basePartMass = currParticle->GetPDGMass();
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initialised = true;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4ionGasIonisation::PrintInfo()
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{
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G4ionIonisation::PrintInfo();
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G4cout << " Version of ion process with simulation discrete ion/media change exchange."
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<< G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4ionGasIonisation::InitialiseMassCharge(const G4Track& track)
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{
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// First step of an ion
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if(track.GetCurrentStepNumber() == 1) {
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currParticle = track.GetDefinition();
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ionZ = G4int(currParticle->GetPDGCharge()/eplus + 0.5);
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currentIonZ = G4int(track.GetDynamicParticle()->GetCharge()/eplus + 0.5);
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currMassRatio = basePartMass/currParticle->GetPDGMass();
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}
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// any step
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G4double q = eplus*currentIonZ;
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SetDynamicMassCharge(currMassRatio, q*q);
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preStepKinEnergy = track.GetKineticEnergy();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4ionGasIonisation::CorrectionsAlongStep(const G4MaterialCutsCouple* couple,
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const G4DynamicParticle* dp,
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G4double& eloss,
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G4double& s)
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{
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// add corrections
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if(eloss < preStepKinEnergy) {
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const G4ParticleDefinition* part = dp->GetDefinition();
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const G4Material* mat = couple->GetMaterial();
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// use Bethe-Bloch with corrections
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if(preStepKinEnergy*currMassRatio > BetheBlochEnergyThreshold())
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eloss += s*corr->HighOrderCorrections(part,mat,preStepKinEnergy);
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// use nuclear stopping
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else if(NuclearStoppingFlag()) {
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G4double nloss = s*corr->NuclearDEDX(part,mat,preStepKinEnergy - eloss*0.5);
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eloss += nloss;
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fParticleChange.ProposeNonIonizingEnergyDeposit(nloss);
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}
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// effective number of collisions
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G4double x = mat->GetElectronDensity()*s*atomXS;
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// equilibrium charge
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G4double q = fParticleChange.GetProposedCharge();
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// sample charge change during the step
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fParticleChange.SetProposedCharge(SampleChargeAfterStep(q, x));
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4ionGasIonisation::SampleChargeAfterStep(G4double qeff, G4double xeff)
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{
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// qeff - equilibrium charge
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// xeff - effective number of collisions
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// q - current charge
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G4double q = eplus*currentIonZ;
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if(verboseLevel > 1) G4cout << "G4ionGasIonisation: Q1= " << currentIonZ
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<< " Qeff= " << qeff/eplus << " Neff= " << xeff
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<< G4endl;
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return q;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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