G4QuadrupoleMagField.hh

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00027 // $Id: G4QuadrupoleMagField.hh 69786 2013-05-15 09:38:51Z gcosmo $
00028 //
00029 //
00030 // class G4QuadrupoleMagField
00031 //
00032 // Class description:
00033 //
00034 // Class for creation of quadrupole magnetic field
00035 //   fGradient - is the gradient value for quadrupole magnetic lense.
00036 // Then the magnetic field components are:
00037 //   Bx = B[0] = fGradient*X ,
00038 //   By = B[1] = fGradient*Y ,
00039 //   Bz = B[2] = 0 .
00040 // Here X,Y,Z are the coordinates of a space point of interest.
00041 
00042 // History:
00043 //  3.2.97 - V.Grichine, created.
00044 // 11.5.12 - B. Riese allow displaced origin and rotation (Björn Riese)
00045 // -------------------------------------------------------------------
00046 
00047 #ifndef G4QUADRUPOLEMAGFIELD_HH
00048 #define G4QUADRUPOLEMAGFIELD_HH
00049 
00050 #include "G4MagneticField.hh"
00051 #include "G4ThreeVector.hh"
00052 #include "G4RotationMatrix.hh"
00053 
00054 class G4QuadrupoleMagField : public G4MagneticField
00055 {
00056   public: // with description
00057 
00058     G4QuadrupoleMagField(G4double          pGradient);
00059     G4QuadrupoleMagField(G4double          pGradient, 
00060                          G4ThreeVector     pOrigin, 
00061                          G4RotationMatrix* pMatrix);
00062    ~G4QuadrupoleMagField();
00063 
00064     void GetFieldValue(const G4double yTrack[],
00065                              G4double B[]     ) const;
00066   private:
00067 
00068     G4double          fGradient;
00069     G4ThreeVector     fOrigin;
00070     G4RotationMatrix* fpMatrix;
00071 };
00072 #endif
00073 

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