G4QuadrupoleMagField.hh

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// G4QuadrupoleMagField
//
// Class description:
//
// Class for creation of quadrupole magnetic field
//   fGradient - is the gradient value for quadrupole magnetic lense.
// Then the magnetic field components are:
//   Bx = B[0] = fGradient*X ,
//   By = B[1] = fGradient*Y ,
//   Bz = B[2] = 0 .
// Here X,Y,Z are the coordinates of a space point of interest.
 
// 03.02.1997, V.Grichine - Created
// 11.05.2012, B.Riese  - Allow displaced origin and rotation
// -------------------------------------------------------------------
#ifndef G4QUADRUPOLEMAGFIELD_HH
#define G4QUADRUPOLEMAGFIELD_HH
 
#include "G4MagneticField.hh"
#include "G4ThreeVector.hh"
#include "G4RotationMatrix.hh"
 
class G4QuadrupoleMagField : public G4MagneticField
{
  public:
 
    G4QuadrupoleMagField(G4double pGradient);
    G4QuadrupoleMagField(      G4double pGradient, 
                         const G4ThreeVector& pOrigin, 
                               G4RotationMatrix* pMatrix);
   ~G4QuadrupoleMagField() 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