Gabriele Cosmo
214 lines
8.3 KiB
C++
214 lines
8.3 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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// $Id: G4GammaConversion52.hh,v 1.2 2006/06/29 19:50:20 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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//
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//------------------ G4GammaConversion52 physics process -------------------------
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// by Michel Maire, 24 May 1996
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//
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// 11-06-96, Added GetRandomAtom() method and new data member
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// for cumulative total cross section, by M.Maire
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// 21-06-96, SetCuts inplementation, M.Maire
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// 16-09-96, Dynamical array PartialSumSigma, M.Maire
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// 14-01-97, crossection table + meanfreepath table.
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// PartialSumSigma removed, M.Maire
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// 14-03-97, new physics scheme for geant4alpha, M.Maire
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// 13-08-98, new methods SetBining() PrintInfo()
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// 03-08-01, new methods Store/Retrieve PhysicsTable (mma)
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// 06-08-01, BuildThePhysicsTable() called from constructor (mma)
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// 19-09-01, come back to previous ProcessName: "conv"
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// 20-09-01, DoIt: fminimalEnergy = 1*eV (mma)
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// 01-10-01, come back to BuildPhysicsTable(const G4ParticleDefinition&)
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// 13-08-04, suppress .icc file
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// public ComputeCrossSectionPerAtom() and ComputeMeanFreePath() (mma)
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// 09-11-04, Remove Retrieve tables (V.Ivanchenko)
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// 04-05-05, Add 52 to class name (V.Ivanchenko)
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// -----------------------------------------------------------------------------
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// class description
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//
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// gamma ---> e+ e-
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// inherit from G4VDiscreteProcess
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#ifndef G4GammaConversion52_h
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#define G4GammaConversion52_h 1
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#include "G4ios.hh"
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#include "globals.hh"
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#include "Randomize.hh"
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#include "G4VDiscreteProcess.hh"
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#include "G4PhysicsTable.hh"
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#include "G4PhysicsLogVector.hh"
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#include "G4Element.hh"
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#include "G4Gamma.hh"
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#include "G4Electron.hh"
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#include "G4Positron.hh"
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#include "G4Step.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4GammaConversion52 : public G4VDiscreteProcess
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{
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public: // with description
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G4GammaConversion52(const G4String& processName ="conv",
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G4ProcessType type = fElectromagnetic);
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~G4GammaConversion52();
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G4bool IsApplicable(const G4ParticleDefinition&);
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// true for Gamma only.
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void SetPhysicsTableBining(G4double lowE, G4double highE, G4int nBins);
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// Allows to define the binning of the PhysicsTables,
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// before to build them.
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void BuildPhysicsTable(const G4ParticleDefinition&);
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// It builds the total CrossSectionPerAtom table, for Gamma,
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// and for every element contained in the elementTable.
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// It builds the MeanFreePath table, for Gamma,
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// and for every material contained in the materialTable.
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G4bool StorePhysicsTable(const G4ParticleDefinition* ,
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const G4String& directory, G4bool);
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// store CrossSection and MeanFreePath tables into an external file
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// specified by 'directory' (must exist before invokation)
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//G4bool RetrievePhysicsTable(const G4ParticleDefinition* ,
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// const G4String& directory, G4bool);
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// retrieve CrossSection and MeanFreePath tables from an external file
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// specified by 'directory'
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void PrintInfoDefinition();
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// Print few lines of informations about the process: validity range,
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// origine ..etc..
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// Invoked by BuildThePhysicsTable().
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G4double GetMeanFreePath(const G4Track& aTrack,
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G4double previousStepSize,
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G4ForceCondition* condition);
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// It returns the MeanFreePath of the process for the current track :
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// (energy, material)
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// The previousStepSize and G4ForceCondition* are not used.
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// This function overloads a virtual function of the base class.
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// It is invoked by the ProcessManager of the Particle.
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G4double GetCrossSectionPerAtom(const G4DynamicParticle* aDynamicGamma,
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G4Element* anElement);
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// It returns the total CrossSectionPerAtom of the process,
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// for the current DynamicGamma (energy), in anElement.
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep);
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// It computes the final state of the process (at end of step),
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// returned as a ParticleChange object.
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// This function overloads a virtual function of the base class.
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// It is invoked by the ProcessManager of the Particle.
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virtual
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G4double ComputeCrossSectionPerAtom(G4double GammaEnergy,
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G4double AtomicNumber);
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G4double ComputeMeanFreePath (G4double GammaEnergy,
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G4Material* aMaterial);
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private:
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G4Element* SelectRandomAtom(const G4DynamicParticle* aDynamicGamma,
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G4Material* aMaterial);
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G4double ScreenFunction1(G4double ScreenVariable);
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G4double ScreenFunction2(G4double ScreenVariable);
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private:
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// hide assignment operator as private
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G4GammaConversion52& operator=(const G4GammaConversion52 &right);
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G4GammaConversion52(const G4GammaConversion52& );
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private:
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G4PhysicsTable* theCrossSectionTable; // table for crossection
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G4PhysicsTable* theMeanFreePathTable;
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G4double LowestEnergyLimit ; // low energy limit of the tables
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G4double HighestEnergyLimit ; // high energy limit of the tables
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G4int NumbBinTable ; // number of bins in the tables
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G4double fminimalEnergy; // minimalEnergy of produced particles
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G4double MeanFreePath; // actual MeanFreePath (current medium)
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion52::ScreenFunction1(G4double ScreenVariable)
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// compute the value of the screening function 3*PHI1 - PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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else
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screenVal = 42.392 - ScreenVariable*(7.796 - 1.961*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4GammaConversion52::ScreenFunction2(G4double ScreenVariable)
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// compute the value of the screening function 1.5*PHI1 - 0.5*PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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else
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screenVal = 41.405 - ScreenVariable*(5.828 - 0.8945*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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