Gabriele Cosmo
246 lines
8.7 KiB
C++
246 lines
8.7 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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// $Id: G4ionIonisation.hh,v 1.24 2004/05/10 18:46:48 vnivanch Exp $
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// GEANT4 tag $Name: geant4-06-02 $
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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: G4ionIonisation
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 07.05.2002
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//
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// Modifications:
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//
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// 26-12-02 Secondary production moved to derived classes (VI)
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// 24-01-03 Make models region aware (V.Ivanchenko)
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// 05-02-03 Fix compilation warnings (V.Ivanchenko)
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// 13-02-03 SubCutoff regime is assigned to a region (V.Ivanchenko)
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// 15-02-03 Add control on delta pointer (V.Ivanchenko)
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// 23-05-03 Add fluctuation model as a member function (V.Ivanchenko)
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// 03-08-03 Add effective charge and saturation of tmax (V.Ivanchenko)
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// 12-11-03 Fix problem of negative effective charge (V.Ivanchenko)
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// 12-11-03 G4EnergyLossSTD -> G4EnergyLossProcess (V.Ivanchenko)
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// 21-01-04 Migrade to G4ParticleChangeForLoss (V.Ivanchenko)
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//
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// Class Description:
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//
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// This class manages the ionisation process for ions.
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// it inherites from G4VContinuousDiscreteProcess via G4VEnergyLoss.
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4ionIonisation_h
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#define G4ionIonisation_h 1
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#include "G4VEnergyLossProcess.hh"
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class G4Material;
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class G4VEmFluctuationModel;
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class G4ionIonisation : public G4VEnergyLossProcess
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{
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public:
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G4ionIonisation(const G4String& name = "ionIoni");
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~G4ionIonisation();
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G4bool IsApplicable(const G4ParticleDefinition& p);
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virtual G4double MinPrimaryEnergy(const G4ParticleDefinition* p,
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const G4Material*, G4double cut);
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virtual std::vector<G4Track*>* SecondariesAlongStep(
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const G4Step&,
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G4double&,
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G4double&,
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G4double&);
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virtual void SecondariesPostStep(
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G4VEmModel*,
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double&,
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G4double&);
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void SetSubCutoff(G4bool val);
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void PrintInfoDefinition();
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// Print out of the class parameters
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G4double EffectiveChargeSquare(const G4Track& track);
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G4double EffectiveCharge(const G4ParticleDefinition* p,
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const G4Material* material,
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G4double kineticEnergy);
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protected:
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const G4ParticleDefinition* DefineBaseParticle(const G4ParticleDefinition* p);
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virtual G4double GetMeanFreePath(const G4Track& track,
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G4double previousStepSize,
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G4ForceCondition* condition);
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virtual G4double MaxSecondaryEnergy(const G4DynamicParticle* dynParticle);
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private:
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void InitialiseProcess();
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// hide assignment operator
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G4ionIonisation & operator=(const G4ionIonisation &right);
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G4ionIonisation(const G4ionIonisation&);
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// cash
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const G4Material* theMaterial;
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const G4ParticleDefinition* currentParticle;
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const G4ParticleDefinition* theParticle;
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const G4ParticleDefinition* theBaseParticle;
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G4VEmFluctuationModel* flucModel;
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G4double chargeCorrection;
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G4double chargeLowLimit;
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G4double energyLowLimit;
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G4bool subCutoff;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4bool G4ionIonisation::IsApplicable(const G4ParticleDefinition& p)
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{
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return (p.GetPDGCharge() != 0.0 && !p.IsShortLived() &&
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(p.GetParticleType() == "nucleus" || p.GetParticleType() == "static_nucleus"));
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4ionIonisation::MinPrimaryEnergy(
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const G4ParticleDefinition*, const G4Material*, G4double cut)
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{
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G4double x = 0.5*cut/electron_mass_c2;
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G4double g = sqrt(1. + x);
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return proton_mass_c2*(g - 1.0);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4ionIonisation::MaxSecondaryEnergy(const G4DynamicParticle* dynParticle)
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{
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G4double mass = dynParticle->GetMass();
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G4double gamma = dynParticle->GetKineticEnergy()/mass + 1.0;
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G4double tmax = electron_mass_c2*std::min(2.0*(gamma*gamma - 1.),
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51200.*pow(proton_mass_c2/mass,0.66667));
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return tmax;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4ionIonisation::GetMeanFreePath(const G4Track& track,
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G4double, G4ForceCondition*)
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{
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G4double mRatio = proton_mass_c2/track.GetDynamicParticle()->GetMass();
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G4double q_2 = EffectiveChargeSquare(track);
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SetMassRatio(mRatio);
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SetReduceFactor(1.0/(q_2*mRatio));
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SetChargeSquare(q_2);
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SetChargeSquareRatio(q_2);
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return G4VEnergyLossProcess::GetMeanFreePath(track, 0.0, 0);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4VSubCutoffProcessor.hh"
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inline std::vector<G4Track*>* G4ionIonisation::SecondariesAlongStep(
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const G4Step& step,
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G4double& tmax,
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G4double& eloss,
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G4double& scaledEnergy)
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{
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std::vector<G4Track*>* newp = 0;
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if(subCutoff) {
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G4VSubCutoffProcessor* sp = SubCutoffProcessor(CurrentMaterialCutsCoupleIndex());
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if (sp) {
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G4VEmModel* model = SelectModel(scaledEnergy);
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newp = sp->SampleSecondaries(step,tmax,eloss,model);
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}
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}
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G4double e = step.GetTrack()->GetKineticEnergy() - eloss;
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fParticleChange.SetProposedCharge(EffectiveCharge(currentParticle,theMaterial,e));
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return newp;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4VEmModel.hh"
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inline void G4ionIonisation::SecondariesPostStep(
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G4VEmModel* model,
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const G4MaterialCutsCouple* couple,
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const G4DynamicParticle* dp,
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G4double& tcut,
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G4double& kinEnergy)
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{
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G4DynamicParticle* delta = model->SampleSecondary(couple, dp, tcut, kinEnergy);
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if(delta) {
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fParticleChange.SetNumberOfSecondaries(1);
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fParticleChange.AddSecondary(delta);
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G4ThreeVector finalP = dp->GetMomentum();
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kinEnergy -= delta->GetKineticEnergy();
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fParticleChange.SetProposedCharge(EffectiveCharge(currentParticle,theMaterial,kinEnergy));
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finalP -= delta->GetMomentum();
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finalP = finalP.unit();
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fParticleChange.SetProposedMomentumDirection(finalP);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4ionIonisation::EffectiveChargeSquare(const G4Track& track)
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{
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currentParticle = track.GetDefinition();
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theMaterial = track.GetMaterial();
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G4double kinEnergy = track.GetKineticEnergy();
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G4double charge = EffectiveCharge(currentParticle,theMaterial,kinEnergy)
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*chargeCorrection/eplus;
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return charge*charge;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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