include/Geant4/G4HelixHeum.hh

0001 //
0002 // ********************************************************************
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0025 //
0026 // G4HelixHeum
0027 //
0028 // Class description:
0029 //
0030 // Simple Heum stepper for magnetic field:
0031 //     x_1 = x_0 +
0032 //           h * 1/4 * dx(t0,x0)  +
0033 //               3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
0034 // Third order solver.
0035
0036 // Author: W.Wander <wwc@mit.edu>, 03/11/1998
0037 // -------------------------------------------------------------------
0038 #ifndef G4HELIXHEUM_HH
0039 #define G4HELIXHEUM_HH
0040
0041 #include "G4MagHelicalStepper.hh"
0042
0043 class G4HelixHeum : public G4MagHelicalStepper
0044 {
0045   public:
0046
0047     G4HelixHeum(G4Mag_EqRhs *EqRhs);
0048    ~G4HelixHeum() override;
0049
0050     void DumbStepper( const G4double y[],
0051                             G4ThreeVector Bfld,
0052                             G4double      h,
0053                             G4double      yout[] ) override;
0054
0055     inline G4int IntegratorOrder() const override { return 2; }
0056 };
0057
0058 #endif