G4HelixSimpleRunge.hh

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// G4HelixSimpleRunge
//
// Class description:
//
//  Helix Simple Runge-Kutta stepper for magnetic field:
//        x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
//
//  Second order solver.
//  Take the derivative at a position to be assumed at the middle of the
//  Step and add it to the current position.

// Author: W. Wander <wwc@mit.edu>, 03.12.1998
// -------------------------------------------------------------------
#ifndef G4HELIXSIMPLERUNGE_HH
#define G4HELIXSIMPLERUNGE_HH

#include "G4MagHelicalStepper.hh"

class G4HelixSimpleRunge : public G4MagHelicalStepper
{

  public:  // with description

    G4HelixSimpleRunge(G4Mag_EqRhs* EqRhs);

    ~G4HelixSimpleRunge();
  
    void  DumbStepper( const G4double y[],
                             G4ThreeVector Bfld,
                             G4double      h,
                             G4double      yout[] );

    inline G4int IntegratorOrder() const { return 2; }
};

#endif