Gabriele Cosmo
293 lines
11 KiB
C++
293 lines
11 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4eEnergyLoss.hh,v 1.4.4.1 1999/12/07 20:50:53 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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// $Id:
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// ------------------------------------------------------------
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// GEANT 4 class header file
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//
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// For information related to this code contact:
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// CERN, IT Division, ASD group
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// History: first implementation, based on object model of
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// 2nd December 1995, G.Cosmo
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// ---------- G4eEnergyLoss physics process -----------
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// by Laszlo Urban, 20 March 1997
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//
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// 27.05.98 OldGetRange removed + other corrs , L.Urban
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// 10.09.98 cleanup
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// 16.10.98 public method SetStepFunction() + messenger class
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// 20.01.99 new data members , L.Urban
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// ------------------------------------------------------------
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#ifndef G4eEnergyLoss_h
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#define G4eEnergyLoss_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 "G4VContinuousDiscreteProcess.hh"
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#include "G4Material.hh"
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#include "G4Element.hh"
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#include "G4ParticleChangeForLoss.hh"
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#include "globals.hh"
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#include "G4Track.hh"
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#include "G4Step.hh"
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#include "G4Electron.hh"
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#include "G4Positron.hh"
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#include "G4PhysicsLogVector.hh"
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#include "G4PhysicsLinearVector.hh"
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#include "G4EnergyLossTables.hh"
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// Class description:
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// This class is the implementation of the unified Energy Loss process.
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// It calculates the continuous energy loss for e+/e-.
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// The following processes give contributions to the continuous
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// energy loss (by default) :
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// --- ionisation (= cont.ion.loss + delta ray production)
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// --- bremsstrahlung (= cont.loss due to soft brems+discrete bremsstrahlung)
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// more can be added ..........
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// This class creates static dE/dx and range tables for e+ and e-,
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// which tables can be used by other processes , too.
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// G4eEnergyLoss is the base class for the processes giving contribution
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// to the (continuous) energy loss of e+/e- .
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// Class description - end
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class G4EnergyLossMessenger;
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class G4eEnergyLoss : public G4VContinuousDiscreteProcess
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{
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public:
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G4eEnergyLoss(const G4String& );
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~G4eEnergyLoss();
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public: // With description
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G4bool IsApplicable(const G4ParticleDefinition&);
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// true for e+/e- , false otherwise
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void BuildDEDXTable(const G4ParticleDefinition& aParticleType);
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// It builds dE/dx and range tables for aParticleType and
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// for every material contained in the materialtable.
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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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// Computes the steplimit due to the energy loss process.
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G4VParticleChange* AlongStepDoIt(const G4Track& track,
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const G4Step& Step) ;
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// Performs the computation of the (continuous) energy loss
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// after the step (with fluctuation).
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virtual G4double GetMeanFreePath(const G4Track& track,
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G4double previousStepSize,
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G4ForceCondition* condition) = 0;
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// Virtual function to be overridden in the derived classes
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// ( ionisation and bremsstrahlung) .
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virtual G4VParticleChange* PostStepDoIt(const G4Track& track,
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const G4Step& Step) = 0;
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// Virtual function to be overridden in the derived classes
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// ( ionisation and bremsstrahlung) .
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private:
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void BuildRangeTable(const G4ParticleDefinition& aParticleType);
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void BuildInverseRangeTable(const G4ParticleDefinition& aParticleType);
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void BuildTimeTables(const G4ParticleDefinition& aParticleType);
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void BuildRangeVector(G4int materialIndex,
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G4PhysicsLogVector* rangeVector);
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void BuildLabTimeVector(G4int materialIndex,
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G4PhysicsLogVector* rangeVector);
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void BuildProperTimeVector(G4int materialIndex,
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G4PhysicsLogVector* rangeVector);
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void InvertRangeVector(G4int materialIndex,
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G4PhysicsLogVector* rangeVector);
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G4double RangeIntLin(G4PhysicsVector* physicsVector,G4int nbin);
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G4double RangeIntLog(G4PhysicsVector* physicsVector,G4int nbin);
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G4double LabTimeIntLog(G4PhysicsVector* physicsVector,G4int nbin);
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G4double ProperTimeIntLog(G4PhysicsVector* physicsVector,G4int nbin);
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void BuildRangeCoeffATable(const G4ParticleDefinition& aParticleType);
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void BuildRangeCoeffBTable(const G4ParticleDefinition& aParticleType);
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void BuildRangeCoeffCTable(const G4ParticleDefinition& aParticleType);
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G4double GetConstraints(const G4DynamicParticle* aParticle,
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G4Material* aMaterial);
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G4double GetLossWithFluct(const G4DynamicParticle* aParticle,
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G4Material* aMaterial,
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G4double threshold);
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// hide assignment operator
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G4eEnergyLoss (G4eEnergyLoss &);
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G4eEnergyLoss & operator=(const G4eEnergyLoss &right);
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protected:
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G4PhysicsTable* theLossTable;
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G4double ParticleMass; // heavily used
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G4double MinKineticEnergy ; // particle with kinetic energy
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// smaller than MinKineticEnergy
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// is stopped in AlongStepDoIt
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G4double Charge,lastCharge ;
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G4PhysicsTable* theDEDXTable;
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G4PhysicsTable* theRangeTable;
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G4PhysicsTable* theRangeCoeffATable;
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G4PhysicsTable* theRangeCoeffBTable;
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G4PhysicsTable* theRangeCoeffCTable;
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private:
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G4PhysicsTable* theInverseRangeTable;
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G4PhysicsTable* theLabTimeTable ;
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G4PhysicsTable* theProperTimeTable ;
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G4int CounterOfProcess;
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G4PhysicsTable** RecorderOfProcess;
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G4double fdEdx; // computed in GetConstraints
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G4double fRangeNow; // computed in GetConstraints
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G4double linLossLimit ; // used in AlongStepDoIt
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G4int TotBin; // number of bins in table,
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// calculated in BuildPhysicTable
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G4double LowestKineticEnergy;
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G4double HighestKineticEnergy;
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G4double RTable,LOGRTable; // LOGRTable=log(HighestKineticEnergy-
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// LowestKineticEnergy)/TotBin
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// RTable = exp(LOGRTable)
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// variables for the integration routines
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G4double taulow,tauhigh,ltaulow,ltauhigh;
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// data members to speed up the fluctuation calculation
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G4Material* lastMaterial;
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G4int imat;
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G4double f1Fluct,f2Fluct,e1Fluct,e2Fluct,rateFluct,ipotFluct;
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G4double e1LogFluct,e2LogFluct,ipotLogFluct;
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const G4double MaxExcitationNumber ;
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const G4double probLimFluct ;
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const long nmaxDirectFluct,nmaxCont1,nmaxCont2 ;
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//New ParticleChange
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G4ParticleChangeForLoss fParticleChange ;
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//
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// static part of the class
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//
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protected:
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//basic DEDX and Range tables
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static G4PhysicsTable* theDEDXElectronTable ;
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static G4PhysicsTable* theDEDXPositronTable ;
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static G4PhysicsTable* theRangeElectronTable ;
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static G4PhysicsTable* theRangePositronTable ;
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//inverse tables of the range tables
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static G4PhysicsTable* theInverseRangeElectronTable;
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static G4PhysicsTable* theInverseRangePositronTable;
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// lab and proper time tables
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static G4PhysicsTable* theLabTimeElectronTable ;
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static G4PhysicsTable* theLabTimePositronTable ;
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static G4PhysicsTable* theProperTimeElectronTable ;
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static G4PhysicsTable* theProperTimePositronTable ;
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//processes inherited from G4eEnergyLoss
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//register themselves in the static array Recorder
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//for electrons/positrons separately
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//nb of contributing processes = NbOfProcesses
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static G4int NbOfProcesses;
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static G4int CounterOfElectronProcess;
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static G4int CounterOfPositronProcess ;
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static G4PhysicsTable** RecorderOfElectronProcess;
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static G4PhysicsTable** RecorderOfPositronProcess;
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private:
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//for interpolation within the tables
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static G4PhysicsTable* theeRangeCoeffATable;
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static G4PhysicsTable* theeRangeCoeffBTable;
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static G4PhysicsTable* theeRangeCoeffCTable;
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static G4PhysicsTable* thepRangeCoeffATable;
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static G4PhysicsTable* thepRangeCoeffBTable;
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static G4PhysicsTable* thepRangeCoeffCTable;
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static G4double dRoverRange; // dRoverRange is the maximum allowed
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// deltarange/range in one Step
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static G4double finalRange; // final step before stopping
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static G4double c1lim,c2lim,c3lim ; // coeffs for computing steplimit
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static G4bool rndmStepFlag; // control the randomization of the step
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static G4bool EnlossFlucFlag; // control the energy loss fluctuation
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static G4EnergyLossMessenger* eLossMessenger;
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public: // With description
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static void SetNbOfProcesses(G4int nb) {NbOfProcesses=nb;};
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// Sets number of processes giving contribution to the energy loss
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static void PlusNbOfProcesses() {NbOfProcesses++ ;};
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// Increases number of processes giving contribution to the energy loss
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static void MinusNbOfProcesses() {NbOfProcesses-- ;};
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// Decreases number of processes giving contribution to the energy loss
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static G4int GetNbOfProcesses() {return NbOfProcesses;};
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// Gets number of processes giving contribution to the energy loss
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// ( default value = 2)
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static void SetRndmStep (G4bool value) {rndmStepFlag = value;}
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// use / do not use randomisation in energy loss steplimit
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// ( default = no randomisation)
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static void SetEnlossFluc (G4bool value) {EnlossFlucFlag = value;}
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// compute energy loss with/without fluctuation
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// ( default : with fluctuation)
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static void SetStepFunction (G4double c1, G4double c2)
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{dRoverRange = c1; finalRange = c2;
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c1lim=dRoverRange ;
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c2lim=2.*(1-dRoverRange)*finalRange;
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c3lim=-(1.-dRoverRange)*finalRange*finalRange;
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}
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// sets values for data members used to compute the step limit:
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// dRoverRange : max. relative range change in one step,
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// finalRange : if range <= finalRange --> last step for the particle.
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};
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#include "G4eEnergyLoss.icc"
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#endif
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