Gabriele Cosmo
147 lines
4.8 KiB
C++
147 lines
4.8 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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//
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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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//
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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 "G4VEnergyLossSTD.hh"
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class G4ParticleDefinition;
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class G4Track;
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class G4Step;
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class G4Material;
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class G4VEffectiveChargeModel;
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class G4ionIonisation : public G4VEnergyLossSTD
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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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{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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void PrintInfoDefinition() const;
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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 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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const G4ParticleDefinition* theParticle;
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const G4ParticleDefinition* theBaseParticle;
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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 G4ionIonisation::MinPrimaryEnergy(
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const G4ParticleDefinition* p, const G4Material*, G4double cut)
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{
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G4double mass = p->GetPDGMass();
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G4double x = 0.5*cut/electron_mass_c2;
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// G4double y = electron_mass_c2/mass;
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// G4double g = x*y + sqrt((1. + x)*(1. + x*y*y));
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G4double g = sqrt(1. + x);
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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 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 ratio = electron_mass_c2/mass;
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G4double tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
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(1. + 2.0*gamma*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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inline G4double G4ionIonisation::GetMeanFreePath(const G4Track& track,
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G4double step,
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G4ForceCondition* cond)
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{
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const G4DynamicParticle* dp = track.GetDynamicParticle();
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G4double mRatio = proton_mass_c2/dp->GetMass();
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G4double q = dp->GetCharge()/eplus;
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G4double q_2 = q*q;
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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 G4VEnergyLossSTD::GetMeanFreePath(track, step, cond);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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