Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/include/G4QuadrupoleMagField.hh

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  1 //
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 25 //
 26 // G4QuadrupoleMagField
 27 //
 28 // Class description:
 29 //
 30 // Class for creation of quadrupole magnetic field
 31 //   fGradient - is the gradient value for quadrupole magnetic lense.
 32 // Then the magnetic field components are:
 33 //   Bx = B[0] = fGradient*X ,
 34 //   By = B[1] = fGradient*Y ,
 35 //   Bz = B[2] = 0 .
 36 // Here X,Y,Z are the coordinates of a space point of interest.
 37 
 38 // 03.02.1997, V.Grichine - Created
 39 // 11.05.2012, B.Riese  - Allow displaced origin and rotation
 40 // -------------------------------------------------------------------
 41 #ifndef G4QUADRUPOLEMAGFIELD_HH
 42 #define G4QUADRUPOLEMAGFIELD_HH
 43 
 44 #include "G4MagneticField.hh"
 45 #include "G4ThreeVector.hh"
 46 #include "G4RotationMatrix.hh"
 47 
 48 class G4QuadrupoleMagField : public G4MagneticField
 49 {
 50   public:
 51 
 52     G4QuadrupoleMagField(G4double pGradient);
 53     G4QuadrupoleMagField(      G4double pGradient, 
 54                          const G4ThreeVector& pOrigin, 
 55                                G4RotationMatrix* pMatrix);
 56    ~G4QuadrupoleMagField() override;
 57 
 58     void GetFieldValue(const G4double yTrack[],
 59                              G4double B[]     ) const override;
 60     G4Field* Clone() const override;
 61 
 62   private:
 63 
 64     G4double          fGradient = 0.0;
 65     G4ThreeVector     fOrigin = G4ThreeVector(0.0, 0.0, 0.0);
 66     G4RotationMatrix* fpMatrix = nullptr;
 67 };
 68 
 69 #endif
 70