Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/include/G4HelixSimpleRunge.hh

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  1 //
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 25 //
 26 // G4HelixSimpleRunge
 27 //
 28 // Class description:
 29 //
 30 //  Helix Simple Runge-Kutta stepper for magnetic field:
 31 //        x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
 32 //
 33 //  Second order solver.
 34 //  Take the derivative at a position to be assumed at the middle of the
 35 //  Step and add it to the current position.
 36 
 37 // Author: W. Wander <wwc@mit.edu>, 03.12.1998
 38 // -------------------------------------------------------------------
 39 #ifndef G4HELIXSIMPLERUNGE_HH
 40 #define G4HELIXSIMPLERUNGE_HH
 41 
 42 #include "G4MagHelicalStepper.hh"
 43 
 44 class G4HelixSimpleRunge : public G4MagHelicalStepper
 45 {
 46   public:
 47 
 48     G4HelixSimpleRunge(G4Mag_EqRhs* EqRhs);
 49    ~G4HelixSimpleRunge() override;
 50   
 51     void  DumbStepper( const G4double y[],
 52                              G4ThreeVector Bfld,
 53                              G4double      h,
 54                              G4double      yout[] ) override;
 55 
 56     inline G4int IntegratorOrder() const override { return 2; }
 57 };
 58 
 59 #endif
 60