UltraFresnelLensParameterisation.cc

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//
// --------------------------------------------------------------
//                 GEANT 4 - ULTRA experiment example
// --------------------------------------------------------------
//
// Code developed by:
// B. Tome, M.C. Espirito-Santo, A. Trindade, P. Rodrigues 
//
//    ****************************************************
//    *      UltraFresnelLensParameterisation.cc
//    ****************************************************
//
//    Class derived from G4VPVParameterisation and used to define a Fresnel lens geometry
//    through a parameterised replication of G4Cons volumes. These volumes are frustra 
//    of cones describing the lens grooves.
//    An  UltraFresnelLensParameterisation object is created in the UltraFresnelLens class
//
#include <cmath>

#include "UltraFresnelLensParameterisation.hh"
#include "UltraFresnelLens.hh"

#include "G4SystemOfUnits.hh"
#include "G4VPhysicalVolume.hh"
#include "G4ThreeVector.hh"
#include "G4Cons.hh"

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UltraFresnelLensParameterisation::UltraFresnelLensParameterisation(UltraFresnelLens* Lens)  
{
   
   FresnelLens     = Lens ;
   GrooveWidth     = Lens->GetGrooveWidth() ;
   NumberOfGrooves = Lens->GetNumberOfGrooves() ;

   dZOffset = Lens->GetSagita((NumberOfGrooves-0)*(GrooveWidth)) - 
              Lens->GetSagita((NumberOfGrooves-1)*(GrooveWidth)) ;
}

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UltraFresnelLensParameterisation::~UltraFresnelLensParameterisation()
{;}

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void UltraFresnelLensParameterisation::ComputeTransformation
(const G4int GrooveNo, G4VPhysicalVolume* physVol) const
{

  G4double  Rmin1 = (GrooveNo+0)*(GrooveWidth) ;
  G4double  Rmax1 = (GrooveNo+1)*(GrooveWidth) ;

  G4double     dZ = FresnelLens->GetSagita(Rmax1) - FresnelLens->GetSagita(Rmin1) ;

  if (dZ <= 0.0){
    G4Exception("UltraFresnelLensParameterisation::ComputeTransformation()",
    "AirSh003",FatalException,
    "UltraFresnelLensParameterisation::ComputeTransformation: Groove depth<0 !");
  }
 
  G4ThreeVector origin(0,0,(dZ-dZOffset)/2.);
  physVol->SetTranslation(origin);
  physVol->SetRotation(0);
}

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void UltraFresnelLensParameterisation::ComputeDimensions
(G4Cons& Groove, const G4int GrooveNo, const G4VPhysicalVolume*) const         
{
  G4double  Rmin1 = (GrooveNo+0)*(GrooveWidth) ;
  G4double  Rmax1 = (GrooveNo+1)*(GrooveWidth) ;

  G4double  Rmin2 = Rmin1 ;
  G4double  Rmax2 = Rmin2+0.0001*mm ;
  
  G4double  dZ = FresnelLens->GetSagita(Rmax1) - FresnelLens->GetSagita(Rmin1) ;

  if (dZ <= 0.0){
    G4Exception("UltraFresnelLensParameterisation::ComputeDimensions()",
    "AirSh004",FatalException,
    "UltraFresnelLensParameterisation::ComputeDimensions: Groove depth<0 !");
  }


  Groove.SetInnerRadiusMinusZ(Rmin1) ;
  Groove.SetOuterRadiusMinusZ(Rmax1) ;

  Groove.SetInnerRadiusPlusZ(Rmin2) ;
  Groove.SetOuterRadiusPlusZ(Rmax2) ;

  Groove.SetZHalfLength(dZ/2.) ;

#ifdef ULTRA_VERBOSE

G4cout << "UltraFresnelLensParameterisation: GrooveNo " << GrooveNo+1 << 
" Rmin1, Rmax1(mm): " << Rmin1/mm <<" "<<  Rmax1/mm << " dZ(mm) " << dZ/mm << G4endl ;
#endif



}