Gabriele Cosmo
210 lines
7.5 KiB
C++
210 lines
7.5 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 1.38 2005/05/12 11:06:43 vnivanch Exp $
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// GEANT4 tag $Name: geant4-08-00 $
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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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// 08-11-04 Migration to new interface of Store/Retrieve tables (V.Ivantchenko)
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// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
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// 11-04-05 Move MaxSecondary energy to model (V.Ivanchneko)
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// 11-04-04 Move MaxSecondaryEnergy to models (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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#include "G4ionEffectiveCharge.hh"
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#include "G4VEmModel.hh"
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#include "G4EmCorrections.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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virtual ~G4ionIonisation();
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G4bool IsApplicable(const G4ParticleDefinition& p);
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// Print out of the class parameters
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virtual void PrintInfo();
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protected:
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void CorrectionsAlongStep(
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double& eloss,
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G4double& length);
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virtual std::vector<G4DynamicParticle*>* 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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void InitialiseEnergyLossProcess(const G4ParticleDefinition*,
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const G4ParticleDefinition*);
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G4double GetMeanFreePath(const G4Track& track,
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G4double previousStepSize,
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G4ForceCondition* condition);
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virtual G4double MinPrimaryEnergy(const G4ParticleDefinition* p,
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const G4Material*, G4double cut);
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private:
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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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G4ionEffectiveCharge effCharge;
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G4VEmFluctuationModel* flucModel;
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G4EmCorrections* corr;
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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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G4double preKinEnergy;
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G4double eth;
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G4double baseMass;
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G4double massRatio;
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G4bool isInitialised;
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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");
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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 = std::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::GetMeanFreePath(const G4Track& track,
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G4double,
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G4ForceCondition* cond)
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{
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currentParticle = track.GetDefinition();
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theMaterial = track.GetMaterial();
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preKinEnergy = track.GetKineticEnergy();
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massRatio = baseMass/track.GetDynamicParticle()->GetMass();
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G4double q_2 = effCharge.EffectiveChargeSquareRatio(currentParticle,theMaterial,
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preKinEnergy);
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SetMassRatio(massRatio);
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SetReduceFactor(1.0/(q_2*massRatio));
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SetChargeSquare(q_2);
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SetChargeSquareRatio(q_2);
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return G4VEnergyLossProcess::GetMeanFreePath(track, 0.0, cond);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline void G4ionIonisation::CorrectionsAlongStep(
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double& eloss,
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G4double& s)
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{
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if(eloss < preKinEnergy) {
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if(preKinEnergy*massRatio > eth)
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eloss += s*corr->HighOrderCorrections(currentParticle,theMaterial,preKinEnergy);
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else
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eloss += s*corr->NuclearDEDX(currentParticle,theMaterial,preKinEnergy - eloss*0.5);
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fParticleChange.SetProposedCharge(effCharge.EffectiveCharge(currentParticle,
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theMaterial,preKinEnergy-eloss));
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline std::vector<G4DynamicParticle*>* 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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{
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return model->SampleSecondaries(couple, dp, tcut);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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