include/Geant4/G4HelixSimpleRunge.hh

0001 //
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0025 //
0026 // G4HelixSimpleRunge
0027 //
0028 // Class description:
0029 //
0030 //  Helix Simple Runge-Kutta stepper for magnetic field:
0031 //        x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
0032 //
0033 //  Second order solver.
0034 //  Take the derivative at a position to be assumed at the middle of the
0035 //  Step and add it to the current position.
0036
0037 // Author: W. Wander <wwc@mit.edu>, 03.12.1998
0038 // -------------------------------------------------------------------
0039 #ifndef G4HELIXSIMPLERUNGE_HH
0040 #define G4HELIXSIMPLERUNGE_HH
0041
0042 #include "G4MagHelicalStepper.hh"
0043
0044 class G4HelixSimpleRunge : public G4MagHelicalStepper
0045 {
0046   public:
0047
0048     G4HelixSimpleRunge(G4Mag_EqRhs* EqRhs);
0049    ~G4HelixSimpleRunge() override;
0050
0051     void  DumbStepper( const G4double y[],
0052                              G4ThreeVector Bfld,
0053                              G4double      h,
0054                              G4double      yout[] ) override;
0055
0056     inline G4int IntegratorOrder() const override { return 2; }
0057 };
0058
0059 #endif