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// $Id: G4PAIxSection.hh,v 1.15 2008/05/30 16:04:40 grichine Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// 
// G4PAIxSection.hh -- header file
//
// GEANT 4 class header file --- Copyright CERN 1995
// CERB Geneva Switzerland
//
// for information related to this code, please, contact
// CERN, CN Division, ASD Group
//
// Preparation of ionizing collision cross section according to Photo Absorption 
// Ionization (PAI) model for simulation of ionization energy losses in very thin
// absorbers. Author: Vladimir.Grichine@cern.ch
//
// History:
//
// 19.10.03, V. Grichine: Integral dEdx was added for G4PAIModel class  
//                       
// 13.05.03, V. Grichine: Numerical instability was fixed in SumOverInterval/Border 
//                        functions
// 10.02.02, V. Grichine: New functions and arrays/gets for Cerenkov and 
//                        plasmon collisions dN/dx
// 27.10.99, V. Grichine: Bug fixed in constructors, 3rd constructor and 
//                        GetStepEnergyLoss(step) were added, fDelta = 0.005
// 30.11.97, V. Grichine: 2nd version 
// 11.06.97, V. Grichine: 1st version

#ifndef G4PAIXSECTION_HH
#define G4PAIXSECTION_HH

#include "G4ios.hh"
#include "globals.hh"
#include "Randomize.hh"

#include"G4SandiaTable.hh"

class G4MaterialCutsCouple;
class G4Sandiatable;


class G4PAIxSection
{
public:
	  // Constructors
  G4PAIxSection( G4MaterialCutsCouple* matCC);
	  
  G4PAIxSection( G4int materialIndex,
	                 G4double maxEnergyTransfer   );
	  
  G4PAIxSection( G4int materialIndex,           // for proton loss table
		         G4double maxEnergyTransfer,
		         G4double betaGammaSq ,
                         G4double** photoAbsCof, G4int intNumber         );

  G4PAIxSection( G4int materialIndex,           // test constructor
		         G4double maxEnergyTransfer,
		         G4double betaGammaSq          );
	  
	  // G4PAIxSection(const G4PAIxSection& right);
	  
	  // Destructor
	  
          ~G4PAIxSection();
	  
	  // Operators
          // G4PAIxSection& operator=(const G4PAIxSection& right);
          // G4int operator==(const G4PAIxSection& right)const;
          // G4int operator!=(const G4PAIxSection& right)const;
	  
	  // Methods
	  
	  // General control functions
          
	  void InitPAI();

          void NormShift( G4double betaGammaSq );

          void SplainPAI( G4double betaGammaSq );
	  	  
	  // Physical methods
          

          G4double RutherfordIntegral( G4int intervalNumber,
	                               G4double limitLow,
				       G4double limitHigh     );

          G4double ImPartDielectricConst( G4int intervalNumber,
	                                  G4double energy        );

          G4double GetPhotonRange( G4double energy );
          G4double GetElectronRange( G4double energy );

          G4double RePartDielectricConst(G4double energy);

          G4double DifPAIxSection( G4int intervalNumber,
	                           G4double betaGammaSq    );

          G4double PAIdNdxCerenkov( G4int intervalNumber,
	                           G4double betaGammaSq    );
          G4double PAIdNdxMM( G4int intervalNumber,
	                           G4double betaGammaSq    );

          G4double PAIdNdxPlasmon( G4int intervalNumber,
	                           G4double betaGammaSq    );

          G4double PAIdNdxResonance( G4int intervalNumber,
	                           G4double betaGammaSq    );

	  void     IntegralPAIxSection();
	  void     IntegralCerenkov();
	  void     IntegralMM();
	  void     IntegralPlasmon();
	  void     IntegralResonance();

          G4double SumOverInterval(G4int intervalNumber);
          G4double SumOverIntervaldEdx(G4int intervalNumber);
          G4double SumOverInterCerenkov(G4int intervalNumber);
          G4double SumOverInterMM(G4int intervalNumber);
          G4double SumOverInterPlasmon(G4int intervalNumber);
          G4double SumOverInterResonance(G4int intervalNumber);

          G4double SumOverBorder( G4int intervalNumber,
	                          G4double energy          );
          G4double SumOverBorderdEdx( G4int intervalNumber,
	                          G4double energy          );
          G4double SumOverBordCerenkov( G4int intervalNumber,
	                                G4double energy          );
          G4double SumOverBordMM( G4int intervalNumber,
	                                G4double energy          );
          G4double SumOverBordPlasmon( G4int intervalNumber,
	                               G4double energy          );
          G4double SumOverBordResonance( G4int intervalNumber,
	                               G4double energy          );

          G4double GetStepEnergyLoss( G4double step );
          G4double GetStepCerenkovLoss( G4double step );
          G4double GetStepMMLoss( G4double step );
          G4double GetStepPlasmonLoss( G4double step );
          G4double GetStepResonanceLoss( G4double step );
	 
          G4double GetEnergyTransfer();
          G4double GetCerenkovEnergyTransfer();
          G4double GetMMEnergyTransfer();
          G4double GetPlasmonEnergyTransfer();
          G4double GetResonanceEnergyTransfer();
          G4double GetRutherfordEnergyTransfer();
	 
	  // Inline access functions

	  G4int GetNumberOfGammas() const { return fNumberOfGammas; }
	  
          G4int GetSplineSize() const { return fSplineNumber; }
	  
          G4int GetIntervalNumber() const { return fIntervalNumber; }

          G4double GetEnergyInterval(G4int i){ return fEnergyInterval[i]; } 

          G4double GetDifPAIxSection(G4int i){ return fDifPAIxSection[i]; } 
          G4double GetPAIdNdxCerenkov(G4int i){ return fdNdxCerenkov[i]; } 
          G4double GetPAIdNdxMM(G4int i){ return fdNdxMM[i]; } 
          G4double GetPAIdNdxPlasmon(G4int i){ return fdNdxPlasmon[i]; } 
          G4double GetPAIdNdxResonance(G4int i){ return fdNdxResonance[i]; } 
	  
	  G4double GetMeanEnergyLoss() const {return fIntegralPAIxSection[0]; }
	  G4double GetMeanCerenkovLoss() const {return fIntegralCerenkov[0]; }
	  G4double GetMeanMMLoss() const {return fIntegralMM[0]; }
	  G4double GetMeanPlasmonLoss() const {return fIntegralPlasmon[0]; }
	  G4double GetMeanResonanceLoss() const {return fIntegralResonance[0]; }

	  G4double GetNormalizationCof() const { return fNormalizationCof; }
          
	  inline G4double GetPAItable(G4int i,G4int j) const;

          inline G4double GetLorentzFactor(G4int i) const;
	  	  
	  inline G4double GetSplineEnergy(G4int i) const;
	  
	  inline G4double GetIntegralPAIxSection(G4int i) const;
	  inline G4double GetIntegralPAIdEdx(G4int i) const;
	  inline G4double GetIntegralCerenkov(G4int i) const;
	  inline G4double GetIntegralMM(G4int i) const;
	  inline G4double GetIntegralPlasmon(G4int i) const;
	  inline G4double GetIntegralResonance(G4int i) const;

protected :

private :

// Local class constants
 
static const G4double fDelta; // energy shift from interval border = 0.001
static const G4double fError; // error in lin-log approximation = 0.005

static       G4int fNumberOfGammas;         // = 111;
static const G4double fLorentzFactor[112];  //  static gamma array

static 
const G4int fRefGammaNumber ; // The number of gamma for creation of spline (15)

G4int    fIntervalNumber ;    //  The number of energy intervals
G4double fNormalizationCof;   // Normalization cof for PhotoAbsorptionXsection

// G4double fBetaGammaSq;        // (beta*gamma)^2

  G4int fMaterialIndex;  // current material index
  G4double fDensity;            // Current density
  G4double fElectronDensity;    // Current electron (number) density
  G4int    fSplineNumber;       // Current size of spline

// Arrays of Sandia coefficients

  G4OrderedTable* fMatSandiaMatrix;
  G4SandiaTable*  fSandia;

G4double* fEnergyInterval;
G4double* fA1; 
G4double* fA2;
G4double* fA3; 
G4double* fA4;

static
const G4int   fMaxSplineSize ;          // Max size of output splain arrays = 500

/* ******************
G4double*          fSplineEnergy;   // energy points of splain
G4double* fRePartDielectricConst;   // Real part of dielectric const
G4double* fImPartDielectricConst;   // Imaginary part of dielectric const
G4double*          fIntegralTerm;   // Integral term in PAI cross section
G4double*        fDifPAIxSection;   // Differential PAI cross section
G4double*   fIntegralPAIxSection;   // Integral PAI cross section  ?
*/ ///////////////


G4double          fSplineEnergy[500];   // energy points of splain
G4double fRePartDielectricConst[500];   // Real part of dielectric const
G4double fImPartDielectricConst[500];   // Imaginary part of dielectric const
G4double          fIntegralTerm[500];   // Integral term in PAI cross section
G4double        fDifPAIxSection[500];   // Differential PAI cross section
G4double          fdNdxCerenkov[500];   // dNdx of Cerenkov collisions
G4double          fdNdxMM[500];   // dNdx of MM-Cerenkov collisions
G4double          fdNdxPlasmon[500];   // dNdx of Plasmon collisions
G4double          fdNdxResonance[500];   // dNdx of resonance collisions

G4double   fIntegralPAIxSection[500];   // Integral PAI cross section  ?
G4double   fIntegralPAIdEdx[500];   // Integral PAI dEdx  ?
G4double   fIntegralCerenkov[500];   // Integral Cerenkov N>omega  ?
G4double   fIntegralMM[500];   // Integral MM-Cerenkov N>omega  ?
G4double   fIntegralPlasmon[500];   // Integral Plasmon N>omega  ?
G4double   fIntegralResonance[500];   // Integral resonance N>omega  ?

G4double fPAItable[500][112]; // Output array

};    

////////////////  Inline methods //////////////////////////////////
//


inline G4double G4PAIxSection::GetPAItable(G4int i, G4int j) const
{
   return fPAItable[i][j];
}

inline G4double G4PAIxSection::GetLorentzFactor(G4int j) const
{
   return fLorentzFactor[j];
}

inline G4double G4PAIxSection::GetSplineEnergy(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
      G4Exception("Invalid argument in G4PAIxSection::GetSplineEnergy");
   }
   return fSplineEnergy[i];
}
	  
inline G4double G4PAIxSection::GetIntegralPAIxSection(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
    G4Exception("Invalid argument in G4PAIxSection::GetIntegralPAIxSection");
   }
   return fIntegralPAIxSection[i];
}

inline G4double G4PAIxSection::GetIntegralPAIdEdx(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
    G4Exception("Invalid argument in G4PAIxSection::GetIntegralPAIxSection");
   }
   return fIntegralPAIdEdx[i];
}

inline G4double G4PAIxSection::GetIntegralCerenkov(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
    G4Exception("Invalid argument in G4PAIxSection::GetIntegralCerenkov");
   }
   return fIntegralCerenkov[i];
}

inline G4double G4PAIxSection::GetIntegralMM(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
    G4Exception("Invalid argument in G4PAIxSection::GetIntegralMM");
   }
   return fIntegralMM[i];
}

inline G4double G4PAIxSection::GetIntegralPlasmon(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
    G4Exception("Invalid argument in G4PAIxSection::GetIntegralPlasmon");
   }
   return fIntegralPlasmon[i];
}

inline G4double G4PAIxSection::GetIntegralResonance(G4int i) const 
{
   if(i < 1 || i > fSplineNumber)
   {
    G4Exception("Invalid argument in G4PAIxSection::GetIntegralResonance");
   }
   return fIntegralResonance[i];
}

#endif   

// -----------------   end of G4PAIxSection header file    -------------------
