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// $Id: G4eBremsstrahlung.hh,v 1.14 2002/04/09 17:34:41 vnivanch Exp $
// GEANT4 tag $Name: geant4-04-01 $
//
// 
//      ------------ G4eBremsstrahlung physics process ------
//                     by Laszlo Urban, 24 July 1996
// 
// 01-10-96 new type G4OrderedTable;  ComputePartialSumSigma()
// 20-03-97 new energy loss+ionisation+brems scheme, L.Urban
// 01-09-98 new method  PrintInfo() 
// 10-02-00 modifications , new e.m. structure, L.Urban
// 07-08-00 new cross section/en.loss parametrisation, LPM flag , L.Urban
// 09-08-01 new methods Store/Retrieve PhysicsTable (mma)
// 19-09-01 come back to previous process name "eBrem"
// 29-10-01 all static functions no more inlined (mma)  
// ------------------------------------------------------------

// Class description
//
// This class manages the bremsstrahlung for e-/e+
// it inherites from G4VContinuousDiscreteProcess via G4VeEnergyLoss.
//
// Class description - end

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#ifndef G4eBremsstrahlung_h
#define G4eBremsstrahlung_h 1

#include "G4ios.hh" 
#include "globals.hh"
#include "Randomize.hh" 
#include "G4VeEnergyLoss.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4Gamma.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4OrderedTable.hh" 
#include "G4PhysicsTable.hh"
#include "G4PhysicsLogVector.hh"

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class G4eBremsstrahlung : public G4VeEnergyLoss
 
{ 
  public:
 
     G4eBremsstrahlung(const G4String& processName = "eBrem");
 
    ~G4eBremsstrahlung();

     G4bool IsApplicable(const G4ParticleDefinition&);
     
     void PrintInfoDefinition();
           
     void BuildPhysicsTable(const G4ParticleDefinition& ParticleType);
     
     void BuildLossTable(const G4ParticleDefinition& ParticleType);

     void BuildLambdaTable(const G4ParticleDefinition& ParticleType);

     G4double GetMeanFreePath(const G4Track& track,
                              G4double previousStepSize,
                              G4ForceCondition* condition );
 
     G4VParticleChange *PostStepDoIt(const G4Track& track,         
                                     const G4Step&  step);                 

     G4double GetLambda(G4double KineticEnergy,G4Material* material);
     
     G4bool StorePhysicsTable(G4ParticleDefinition* ,
  		              const G4String& directory, G4bool);
      // store eLoss and MeanFreePath tables into an external file
      // specified by 'directory' (must exist before invokation)
      
     G4bool RetrievePhysicsTable(G4ParticleDefinition* ,   
			         const G4String& directory, G4bool);
      // retrieve eLoss and MeanFreePath tables from an external file
      // specified by 'directory'
            
  protected:

     G4double ComputeMeanFreePath( const G4ParticleDefinition* ParticleType,
                                         G4double KineticEnergy, 
                                   const G4Material* aMaterial);

     void ComputePartialSumSigma( const G4ParticleDefinition* ParticleType,
                                        G4double KineticEnergy,
                                  const G4Material* aMaterial);

     virtual G4double ComputeCrossSectionPerAtom(
                                  const G4ParticleDefinition* ParticleType,
                                        G4double KineticEnergy, 
                                        G4double AtomicNumber,
                                        G4double GammaEnergyCut);

  private:
  
     G4double ComputeBremLoss(G4double Z,G4double natom,G4double T,
                              G4double Cut,G4double x);

     G4double ComputePositronCorrFactorLoss(G4double AtomicNumber,
                                            G4double KineticEnergy,
                                            G4double GammaEnergyCut);

     G4double ComputePositronCorrFactorSigma(G4double AtomicNumber,
                                             G4double KineticEnergy, 
                                             G4double GammaEnergyCut);

     G4Element* SelectRandomAtom(G4Material* aMaterial) const;

     G4double ScreenFunction1(G4double ScreenVariable);

     G4double ScreenFunction2(G4double ScreenVariable);

     G4double SupressionFunction(const G4Material* aMaterial,
                                  G4double KineticEnergy,
                                  G4double GammaEnergy) ;

     G4eBremsstrahlung & operator=(const G4eBremsstrahlung &right);
     
     G4eBremsstrahlung(const G4eBremsstrahlung&);
     
  private:

     G4PhysicsTable* theMeanFreePathTable;              

     G4OrderedTable PartialSumSigma;       // partial sum of total crosssection

     static G4double LowerBoundLambda;     // low  energy limit of crossection table
     static G4double UpperBoundLambda;     // high energy limit of crossection table
     static G4int    NbinLambda;           // number of bins in the tables 
     
     G4double MinThreshold;                // minimun value for the production threshold
     
     G4double LowestKineticEnergy,HighestKineticEnergy; // bining of the Eloss table
     G4int    TotBin;                                   // (from G4VeEnergyLoss)

     static G4double probsup;
     static G4bool LPMflag;

  public:

    static void SetLowerBoundLambda(G4double val);
    static void SetUpperBoundLambda(G4double val);
    static void SetNbinLambda(G4int n);
    static G4double GetLowerBoundLambda();
    static G4double GetUpperBoundLambda();
    static G4int GetNbinLambda();

    static void   SetLPMflag(G4bool val);
    static G4bool GetLPMflag();
};

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#include "G4eBremsstrahlung.icc"
  
#endif