Gabriele Cosmo
327 lines
12 KiB
C++
327 lines
12 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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//
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// ------------------------------------------------------------
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// G4hImpactIonisation
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//
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//
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// Author: Maria Grazia Pia (MariaGrazia.Pia@ge.infn.it)
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//
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// 08 Sep 2008 - MGP - Created (initially based on G4hLowEnergyIonisation)
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// Added PIXE capabilities
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// Partial clean-up of the implementation (more needed)
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// Calculation of MicroscopicCrossSection delegated to specialised class
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//
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// ------------------------------------------------------------
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// Class Description:
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// Impact Ionisation process of charged hadrons and ions
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// Initially based on G4hLowEnergyIonisation, to be subject to redesign
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// and further evolution of physics capabilities
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//
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// The physics model of G4hLowEnergyIonisation is described in
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// CERN-OPEN-99-121 and CERN-OPEN-99-300.
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//
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// Documentation available in:
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// M.G. Pia et al., PIXE Simulation With Geant4,
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// IEEE Trans. Nucl. Sci., vol. 56, no. 6, pp. 3614-3649, Dec. 2009.
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// ------------------------------------------------------------
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#ifndef G4HIMPACTIONISATION
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#define G4HIMPACTIONISATION 1
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#include <map>
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#include <CLHEP/Units/PhysicalConstants.h>
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#include "globals.hh"
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#include "G4hRDEnergyLoss.hh"
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#include "G4DataVector.hh"
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#include "G4AtomicDeexcitation.hh"
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#include "G4PixeCrossSectionHandler.hh"
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class G4VLowEnergyModel;
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class G4VParticleChange;
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class G4ParticleDefinition;
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class G4PhysicsTable;
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class G4MaterialCutsCouple;
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class G4Track;
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class G4Step;
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class G4hImpactIonisation : public G4hRDEnergyLoss
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{
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public: // With description
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G4hImpactIonisation(const G4String& processName = "hImpactIoni");
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// The ionisation process for hadrons/ions to be include in the
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// UserPhysicsList
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~G4hImpactIonisation();
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// Destructor
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G4bool IsApplicable(const G4ParticleDefinition&);
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// True for all charged hadrons/ions
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void BuildPhysicsTable(const G4ParticleDefinition& aParticleType) ;
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// Build physics table during initialisation
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G4double GetMeanFreePath(const G4Track& track,
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G4double previousStepSize,
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enum G4ForceCondition* condition );
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// Return MeanFreePath until delta-electron production
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void PrintInfoDefinition() const;
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// Print out of the class parameters
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void SetHighEnergyForProtonParametrisation(G4double energy) {protonHighEnergy = energy;} ;
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// Definition of the boundary proton energy. For higher energies
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// Bethe-Bloch formula is used, for lower energies a parametrisation
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// of the energy losses is performed. Default is 2 MeV.
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void SetLowEnergyForProtonParametrisation(G4double energy) {protonLowEnergy = energy;} ;
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// Set of the boundary proton energy. For lower energies
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// the Free Electron Gas model is used for the energy losses.
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// Default is 1 keV.
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void SetHighEnergyForAntiProtonParametrisation(G4double energy) {antiprotonHighEnergy = energy;} ;
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// Set of the boundary antiproton energy. For higher energies
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// Bethe-Bloch formula is used, for lower energies parametrisation
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// of the energy losses is performed. Default is 2 MeV.
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void SetLowEnergyForAntiProtonParametrisation(G4double energy) {antiprotonLowEnergy = energy;} ;
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// Set of the boundary antiproton energy. For lower energies
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// the Free Electron Gas model is used for the energy losses.
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// Default is 1 keV.
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G4double GetContinuousStepLimit(const G4Track& track,
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G4double previousStepSize,
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G4double currentMinimumStep,
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G4double& currentSafety);
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// Calculation of the step limit due to ionisation losses
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void SetElectronicStoppingPowerModel(const G4ParticleDefinition* aParticle,
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const G4String& dedxTable);
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// This method defines the electron ionisation parametrisation method
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// via the name of the table. Default is "ICRU_49p".
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void SetNuclearStoppingPowerModel(const G4String& dedxTable)
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{theNuclearTable = dedxTable; SetNuclearStoppingOn();};
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// This method defines the nuclear ionisation parametrisation method
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// via the name of the table. Default is "ICRU_49".
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// ---- MGP ---- The following design of On/Off is nonsense; to be modified
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// in a following design iteration
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void SetNuclearStoppingOn() {nStopping = true;};
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// This method switch on calculation of the nuclear stopping power.
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void SetNuclearStoppingOff() {nStopping = false;};
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// This method switch off calculation of the nuclear stopping power.
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void SetBarkasOn() {theBarkas = true;};
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// This method switch on calculation of the Barkas and Bloch effects.
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void SetBarkasOff() {theBarkas = false;};
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// This method switch off calculation of the Barkas and Bloch effects.
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void SetPixe(const G4bool /* val */ ) {pixeIsActive = true;};
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// This method switches atomic relaxation on/off; currently always on
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G4VParticleChange* AlongStepDoIt(const G4Track& trackData ,
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const G4Step& stepData ) ;
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// Function to determine total energy deposition on the step
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G4VParticleChange* PostStepDoIt(const G4Track& track,
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const G4Step& Step ) ;
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// Simulation of delta-ray production.
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G4double ComputeDEDX(const G4ParticleDefinition* aParticle,
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const G4MaterialCutsCouple* couple,
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G4double kineticEnergy);
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// This method returns electronic dE/dx for protons or antiproton
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void SetCutForSecondaryPhotons(G4double cut);
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// Set threshold energy for fluorescence
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void SetCutForAugerElectrons(G4double cut);
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// Set threshold energy for Auger electron production
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void ActivateAugerElectronProduction(G4bool val);
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// Set Auger electron production flag on/off
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// Accessors to configure PIXE
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void SetPixeCrossSectionK(const G4String& name) { modelK = name; }
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void SetPixeCrossSectionL(const G4String& name) { modelL = name; }
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void SetPixeCrossSectionM(const G4String& name) { modelM = name; }
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void SetPixeProjectileMinEnergy(G4double energy) { eMinPixe = energy; }
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void SetPixeProjectileMaxEnergy(G4double energy) { eMaxPixe = energy; }
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protected:
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private:
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void InitializeMe();
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void InitializeParametrisation();
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void BuildLossTable(const G4ParticleDefinition& aParticleType);
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// void BuildDataForFluorescence(const G4ParticleDefinition& aParticleType);
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void BuildLambdaTable(const G4ParticleDefinition& aParticleType);
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void SetProtonElectronicStoppingPowerModel(const G4String& dedxTable)
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{protonTable = dedxTable ;};
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// This method defines the ionisation parametrisation method via its name
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void SetAntiProtonElectronicStoppingPowerModel(const G4String& dedxTable)
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{antiprotonTable = dedxTable;};
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G4double MicroscopicCrossSection(const G4ParticleDefinition& aParticleType,
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G4double kineticEnergy,
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G4double atomicNumber,
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G4double deltaCutInEnergy) const;
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G4double GetConstraints(const G4DynamicParticle* particle,
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const G4MaterialCutsCouple* couple);
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// Function to determine StepLimit
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G4double ProtonParametrisedDEDX(const G4MaterialCutsCouple* couple,
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G4double kineticEnergy) const;
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G4double AntiProtonParametrisedDEDX(const G4MaterialCutsCouple* couple,
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G4double kineticEnergy) const;
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G4double DeltaRaysEnergy(const G4MaterialCutsCouple* couple,
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G4double kineticEnergy,
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G4double particleMass) const;
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// This method returns average energy loss due to delta-rays emission with
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// energy higher than the cut energy for given material.
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G4double BarkasTerm(const G4Material* material,
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G4double kineticEnergy) const;
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// Function to compute the Barkas term for protons
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G4double BlochTerm(const G4Material* material,
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G4double kineticEnergy,
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G4double cSquare) const;
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// Function to compute the Bloch term for protons
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G4double ElectronicLossFluctuation(const G4DynamicParticle* particle,
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const G4MaterialCutsCouple* material,
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G4double meanLoss,
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G4double step) const;
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// Function to sample electronic losses
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// hide assignment operator
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G4hImpactIonisation & operator=(const G4hImpactIonisation &right);
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G4hImpactIonisation(const G4hImpactIonisation&);
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private:
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// private data members ...............................
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G4VLowEnergyModel* betheBlochModel;
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G4VLowEnergyModel* protonModel;
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G4VLowEnergyModel* antiprotonModel;
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G4VLowEnergyModel* theIonEffChargeModel;
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G4VLowEnergyModel* theNuclearStoppingModel;
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G4VLowEnergyModel* theIonChuFluctuationModel;
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G4VLowEnergyModel* theIonYangFluctuationModel;
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// std::map<G4int,G4double,std::less<G4int> > totalCrossSectionMap;
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// name of parametrisation table of electron stopping power
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G4String protonTable;
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G4String antiprotonTable;
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G4String theNuclearTable;
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// interval of parametrisation of electron stopping power
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G4double protonLowEnergy;
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G4double protonHighEnergy;
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G4double antiprotonLowEnergy;
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G4double antiprotonHighEnergy;
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// flag of parametrisation of nucleus stopping power
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G4bool nStopping;
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G4bool theBarkas;
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G4DataVector cutForDelta;
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G4DataVector cutForGamma;
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G4double minGammaEnergy;
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G4double minElectronEnergy;
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G4PhysicsTable* theMeanFreePathTable;
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const G4double paramStepLimit; // parameter limits the step at low energy
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G4double fdEdx; // computed in GetContraints
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G4double fRangeNow ; //
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G4double charge; //
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G4double chargeSquare; //
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G4double initialMass; // mass to calculate Lambda tables
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G4double fBarkas;
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G4PixeCrossSectionHandler* pixeCrossSectionHandler;
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G4AtomicDeexcitation atomicDeexcitation;
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G4String modelK;
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G4String modelL;
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G4String modelM;
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G4double eMinPixe;
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G4double eMaxPixe;
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G4bool pixeIsActive;
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};
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inline G4double G4hImpactIonisation::GetContinuousStepLimit(const G4Track& track,
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G4double,
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G4double currentMinimumStep,
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G4double&)
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{
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G4double step = GetConstraints(track.GetDynamicParticle(),track.GetMaterialCutsCouple()) ;
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// ---- MGP ---- The following line, taken as is from G4hLowEnergyIonisation,
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// is meaningless: currentMinimumStep is passed by value,
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// therefore any local modification to it has no effect
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if ((step > 0.) && (step < currentMinimumStep)) currentMinimumStep = step ;
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return step ;
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}
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inline G4bool G4hImpactIonisation::IsApplicable(const G4ParticleDefinition& particle)
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{
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// ---- MGP ---- Better criterion for applicability to be defined;
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// now hard-coded particle mass > 0.1 * proton_mass
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return (particle.GetPDGCharge() != 0.0 && particle.GetPDGMass() > CLHEP::proton_mass_c2*0.1);
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}
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#endif
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