Gabriele Cosmo
206 lines
7.3 KiB
C++
206 lines
7.3 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: G4MuIonisation.hh,v 1.21 2004/05/07 16:47:15 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: G4MuIonisation
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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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// Modifications:
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//
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// corrected by L.Urban on 24/09/97
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// corrected by L.Urban on 13/01/98
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// bugs fixed by L.Urban on 02/02/99
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// 10/02/00 modifications , new e.m. structure, L.Urban
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// 10-08-01 new methods Store/Retrieve PhysicsTable (mma)
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// 14-08-01 new function ComputeRestrictedMeandEdx() + 'cleanup' (mma)
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// 19-09-01 come back to previous process name "hIoni"
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// 29-10-01 all static functions no more inlined
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// 10-05-02 V.Ivanchenko update to new design
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// 09-12-02 V.Ivanchenko remove warning
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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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// 23-05-03 Add fluctuation model as a member function (V.Ivanchenko)
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// 03-06-03 Add SetIntegral method to choose fluctuation model (V.Ivanchenko)
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// 03-06-03 Fix initialisation problem for STD ionisation (V.Ivanchenko)
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// 08-08-03 STD substitute standard (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 muons.
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// it inherites from G4VContinuousDiscreteProcess via G4VEnergyLossProcess.
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4MuIonisation_h
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#define G4MuIonisation_h 1
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#include "G4VEnergyLossProcess.hh"
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#include "G4Electron.hh"
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#include "G4Positron.hh"
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#include "globals.hh"
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class G4Material;
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class G4VEmFluctuationModel;
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class G4MuIonisation : public G4VEnergyLossProcess
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{
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public:
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G4MuIonisation(const G4String& name = "MuIoni");
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~G4MuIonisation();
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G4bool IsApplicable(const G4ParticleDefinition& p)
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{return (p.GetPDGCharge() != 0.0 && p.GetPDGMass() > 10.0*MeV);};
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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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protected:
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const G4ParticleDefinition* DefineBaseParticle(const G4ParticleDefinition* p);
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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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G4MuIonisation & operator=(const G4MuIonisation &right);
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G4MuIonisation(const G4MuIonisation&);
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G4double mass;
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G4double ratio;
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const G4ParticleDefinition* theParticle;
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const G4ParticleDefinition* theBaseParticle;
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G4VEmFluctuationModel* flucModel;
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G4bool subCutoff;
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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 G4double G4MuIonisation::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 + 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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inline G4double G4MuIonisation::MaxSecondaryEnergy(const G4DynamicParticle* dynParticle)
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{
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G4double tau = dynParticle->GetKineticEnergy()/mass;
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G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.0)/
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(1. + 2.0*(tau + 1.0)*ratio + ratio*ratio);
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return tmax;
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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*>* G4MuIonisation::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& kinEnergy)
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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(kinEnergy);
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newp = sp->SampleSecondaries(step,tmax,eloss,model);
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}
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}
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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 G4MuIonisation::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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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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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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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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