Gabriele Cosmo
350 lines
11 KiB
C++
350 lines
11 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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// $Id$
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//
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//
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////////////////////////////////////////////////////////////////////////
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// Scintillation Light Class Definition
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////////////////////////////////////////////////////////////////////////
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//
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// File: G4Scintillation.hh
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// Description: Discrete Process - Generation of Scintillation Photons
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// Version: 1.0
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// Created: 1998-11-07
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// Author: Peter Gumplinger
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// Updated: 2010-10-20 Allow the scintillation yield to be a function
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// of energy deposited by particle type
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// Thanks to Zach Hartwig (Department of Nuclear
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// Science and Engineeering - MIT)
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// 2005-07-28 add G4ProcessType to constructor
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// 2002-11-21 change to user G4Poisson for small MeanNumPotons
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// 2002-11-07 allow for fast and slow scintillation
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// 2002-11-05 make use of constant material properties
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// 2002-05-16 changed to inherit from VRestDiscreteProcess
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// 2002-05-09 changed IsApplicable method
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// 1999-10-29 add method and class descriptors
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//
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// mail: gum@triumf.ca
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//
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////////////////////////////////////////////////////////////////////////
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#ifndef G4Scintillation_h
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#define G4Scintillation_h 1
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/////////////
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// Includes
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/////////////
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#include "globals.hh"
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#include "templates.hh"
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#include "Randomize.hh"
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#include "G4Poisson.hh"
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#include "G4ThreeVector.hh"
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#include "G4ParticleMomentum.hh"
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#include "G4Step.hh"
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#include "G4VRestDiscreteProcess.hh"
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#include "G4OpticalPhoton.hh"
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#include "G4DynamicParticle.hh"
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#include "G4Material.hh"
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#include "G4PhysicsTable.hh"
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#include "G4MaterialPropertiesTable.hh"
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#include "G4PhysicsOrderedFreeVector.hh"
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#include "G4EmSaturation.hh"
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// Class Description:
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// RestDiscrete Process - Generation of Scintillation Photons.
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// Class inherits publicly from G4VRestDiscreteProcess.
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// Class Description - End:
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/////////////////////
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// Class Definition
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/////////////////////
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class G4Scintillation : public G4VRestDiscreteProcess
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{
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public:
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////////////////////////////////
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// Constructors and Destructor
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////////////////////////////////
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G4Scintillation(const G4String& processName = "Scintillation",
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G4ProcessType type = fElectromagnetic);
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~G4Scintillation();
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private:
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G4Scintillation(const G4Scintillation &right);
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//////////////
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// Operators
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//////////////
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G4Scintillation& operator=(const G4Scintillation &right);
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public:
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////////////
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// Methods
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////////////
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// G4Scintillation Process has both PostStepDoIt (for energy
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// deposition of particles in flight) and AtRestDoIt (for energy
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// given to the medium by particles at rest)
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G4bool IsApplicable(const G4ParticleDefinition& aParticleType);
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// Returns true -> 'is applicable', for any particle type except
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// for an 'opticalphoton' and for short-lived particles
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G4double GetMeanFreePath(const G4Track& aTrack,
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G4double ,
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G4ForceCondition* );
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// Returns infinity; i. e. the process does not limit the step,
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// but sets the 'StronglyForced' condition for the DoIt to be
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// invoked at every step.
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G4double GetMeanLifeTime(const G4Track& aTrack,
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G4ForceCondition* );
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// Returns infinity; i. e. the process does not limit the time,
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// but sets the 'StronglyForced' condition for the DoIt to be
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// invoked at every step.
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep);
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G4VParticleChange* AtRestDoIt (const G4Track& aTrack,
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const G4Step& aStep);
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// These are the methods implementing the scintillation process.
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void SetTrackSecondariesFirst(const G4bool state);
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// If set, the primary particle tracking is interrupted and any
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// produced scintillation photons are tracked next. When all
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// have been tracked, the tracking of the primary resumes.
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void SetFiniteRiseTime(const G4bool state);
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// If set, the G4Scintillation process expects the user to have
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// set the constant material property FAST/SLOWSCINTILLATIONRISETIME.
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G4bool GetTrackSecondariesFirst() const;
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// Returns the boolean flag for tracking secondaries first.
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G4bool GetFiniteRiseTime() const;
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// Returns the boolean flag for a finite scintillation rise time.
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void SetScintillationYieldFactor(const G4double yieldfactor);
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// Called to set the scintillation photon yield factor, needed when
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// the yield is different for different types of particles. This
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// scales the yield obtained from the G4MaterialPropertiesTable.
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G4double GetScintillationYieldFactor() const;
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// Returns the photon yield factor.
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void SetScintillationExcitationRatio(const G4double excitationratio);
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// Called to set the scintillation exciation ratio, needed when
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// the scintillation level excitation is different for different
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// types of particles. This overwrites the YieldRatio obtained
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// from the G4MaterialPropertiesTable.
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G4double GetScintillationExcitationRatio() const;
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// Returns the scintillation level excitation ratio.
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G4PhysicsTable* GetFastIntegralTable() const;
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// Returns the address of the fast scintillation integral table.
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G4PhysicsTable* GetSlowIntegralTable() const;
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// Returns the address of the slow scintillation integral table.
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void AddSaturation(G4EmSaturation* sat) { emSaturation = sat; }
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// Adds Birks Saturation to the process.
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void RemoveSaturation() { emSaturation = NULL; }
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// Removes the Birks Saturation from the process.
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G4EmSaturation* GetSaturation() const { return emSaturation; }
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// Returns the Birks Saturation.
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void SetScintillationByParticleType(const G4bool );
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// Called by the user to set the scintillation yield as a function
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// of energy deposited by particle type
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G4bool GetScintillationByParticleType() const
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{ return scintillationByParticleType; }
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// Return the boolean that determines the method of scintillation
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// production
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void DumpPhysicsTable() const;
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// Prints the fast and slow scintillation integral tables.
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protected:
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void BuildThePhysicsTable();
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// It builds either the fast or slow scintillation integral table;
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// or both.
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///////////////////////
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// Class Data Members
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///////////////////////
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G4PhysicsTable* theSlowIntegralTable;
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G4PhysicsTable* theFastIntegralTable;
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G4bool fTrackSecondariesFirst;
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G4bool fFiniteRiseTime;
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G4double YieldFactor;
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G4double ExcitationRatio;
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G4bool scintillationByParticleType;
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private:
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G4double single_exp(G4double t, G4double tau2);
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G4double bi_exp(G4double t, G4double tau1, G4double tau2);
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// emission time distribution when there is a finite rise time
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G4double sample_time(G4double tau1, G4double tau2);
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G4EmSaturation* emSaturation;
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};
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////////////////////
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// Inline methods
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////////////////////
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inline
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G4bool G4Scintillation::IsApplicable(const G4ParticleDefinition& aParticleType)
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{
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if (aParticleType.GetParticleName() == "opticalphoton") return false;
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if (aParticleType.IsShortLived()) return false;
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return true;
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}
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inline
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void G4Scintillation::SetTrackSecondariesFirst(const G4bool state)
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{
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fTrackSecondariesFirst = state;
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}
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inline
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void G4Scintillation::SetFiniteRiseTime(const G4bool state)
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{
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fFiniteRiseTime = state;
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}
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inline
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G4bool G4Scintillation::GetTrackSecondariesFirst() const
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{
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return fTrackSecondariesFirst;
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}
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inline
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G4bool G4Scintillation::GetFiniteRiseTime() const
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{
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return fFiniteRiseTime;
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}
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inline
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void G4Scintillation::SetScintillationYieldFactor(const G4double yieldfactor)
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{
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YieldFactor = yieldfactor;
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}
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inline
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G4double G4Scintillation::GetScintillationYieldFactor() const
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{
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return YieldFactor;
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}
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inline
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void G4Scintillation::SetScintillationExcitationRatio(const G4double excitationratio)
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{
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ExcitationRatio = excitationratio;
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}
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inline
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G4double G4Scintillation::GetScintillationExcitationRatio() const
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{
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return ExcitationRatio;
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}
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inline
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G4PhysicsTable* G4Scintillation::GetSlowIntegralTable() const
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{
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return theSlowIntegralTable;
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}
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inline
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G4PhysicsTable* G4Scintillation::GetFastIntegralTable() const
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{
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return theFastIntegralTable;
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}
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inline
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void G4Scintillation::DumpPhysicsTable() const
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{
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if (theFastIntegralTable) {
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G4int PhysicsTableSize = theFastIntegralTable->entries();
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G4PhysicsOrderedFreeVector *v;
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for (G4int i = 0 ; i < PhysicsTableSize ; i++ )
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{
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v = (G4PhysicsOrderedFreeVector*)(*theFastIntegralTable)[i];
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v->DumpValues();
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}
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}
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if (theSlowIntegralTable) {
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G4int PhysicsTableSize = theSlowIntegralTable->entries();
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G4PhysicsOrderedFreeVector *v;
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for (G4int i = 0 ; i < PhysicsTableSize ; i++ )
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{
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v = (G4PhysicsOrderedFreeVector*)(*theSlowIntegralTable)[i];
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v->DumpValues();
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}
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}
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}
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inline
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G4double G4Scintillation::single_exp(G4double t, G4double tau2)
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{
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return std::exp(-1.0*t/tau2)/tau2;
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}
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inline
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G4double G4Scintillation::bi_exp(G4double t, G4double tau1, G4double tau2)
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{
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return std::exp(-1.0*t/tau2)*(1-std::exp(-1.0*t/tau1))/tau2/tau2*(tau1+tau2);
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}
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#endif /* G4Scintillation_h */
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