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// $Id: G4StrawTubeXTRadiator.hh,v 1.4 2007/09/29 17:49:34 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// 
///////////////////////////////////////////////////////////////////////////
// 
// Process describing a straw tube radiator of X-ray transition radiation.  
// Thicknesses of plates and gas gaps are gamma distributed.
// We suppose that:
// formation zone ~ mean thickness << absorption length
// for each material and in the range 1-100 keV. This allows us to simplify
// interference effects in radiator stack (GetStackFactor method).
// 
// 
// History:
// 22.04.05 V. Grichine, first version 
// 28.09.07, V.Ivanchenko general cleanup without change of algorithms
//

#ifndef G4StrawTubeXTRadiator_h
#define G4StrawTubeXTRadiator_h 1

#include <complex>
#include "G4VXTRenergyLoss.hh"

class G4SandiaTable;

class G4StrawTubeXTRadiator : public G4VXTRenergyLoss
{
public:

  G4StrawTubeXTRadiator (G4LogicalVolume* anEnvelope, G4Material*, G4Material*,
                         G4double,G4double,G4Material*,G4bool unishut = false,
                         const G4String & processName = "StrawTubeXTRadiator");
  virtual ~G4StrawTubeXTRadiator ();

  // Auxiliary functions for plate/gas material parameters

  G4double  GetMediumFormationZone(G4double,G4double,G4double) ;
  void      ComputeMediumPhotoAbsCof() ;
  G4double  GetMediumLinearPhotoAbs(G4double) ;
  G4complex GetMediumComplexFZ(G4double,G4double,G4double) ;

  // Pure virtual function from base class
  G4double GetStackFactor( G4double energy, G4double gamma, G4double varAngle);

protected:

  G4int      fMatIndex3;
  G4double   fSigma3;

  G4SandiaTable* fMediumPhotoAbsCof;
};

#endif
