G4QuadrupoleMagField.hh

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//
// $Id$
//
//
// class 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.
 
// History:
//  3.2.97 - V.Grichine, created.
// 11.5.12 - B. Riese allow displaced origin and rotation (Björn Riese)
// -------------------------------------------------------------------
 
#ifndef G4QUADRUPOLEMAGFIELD_HH
#define G4QUADRUPOLEMAGFIELD_HH
 
#include "G4MagneticField.hh"
#include "G4ThreeVector.hh"
#include "G4RotationMatrix.hh"
 
class G4QuadrupoleMagField : public G4MagneticField
{
  public: // with description
 
    G4QuadrupoleMagField(G4double          pGradient);
    G4QuadrupoleMagField(G4double          pGradient, 
                         G4ThreeVector     pOrigin, 
                         G4RotationMatrix* pMatrix);
   ~G4QuadrupoleMagField();
 
    void GetFieldValue(const G4double yTrack[],
                             G4double B[]     ) const;
  private:
 
    G4double          fGradient;
    G4ThreeVector     fOrigin;
    G4RotationMatrix* fpMatrix;
};
#endif