G4SextupoleMagField.hh

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//
// Class description:
//
// Sextupole magnetic field
//   fGradient - is the gradient value for a sextupole magnet
//   the magnetic field components are:
//   Bx = B[0] = fGradient*X*Y,
//   By = B[1] = fGradient*(X*X-Y*Y)/2,
//   Bz = B[2] = 0
 
// Author: H. Burkhardt - 23/10/2019
// -------------------------------------------------------------------
#ifndef G4SEXTUPOLEMAGFIELD_HH
#define G4SEXTUPOLEMAGFIELD_HH
 
#include "G4MagneticField.hh"
#include "G4ThreeVector.hh"
#include "G4RotationMatrix.hh"
 
class G4SextupoleMagField : public G4MagneticField
{
  public:
 
    G4SextupoleMagField(G4double pGradient);
    G4SextupoleMagField(      G4double pGradient,
                        const G4ThreeVector& pOrigin,
                        G4RotationMatrix* pMatrix);
   ~G4SextupoleMagField() override;
 
    void GetFieldValue(const G4double yTrack[], G4double B[] ) const override;
    G4Field* Clone() const override;
 
  private:
 
    G4double          fGradient = 0.0;
    G4ThreeVector     fOrigin   = G4ThreeVector(0.0, 0.0, 0.0);
    G4RotationMatrix* fpMatrix  = nullptr;
};
 
#endif