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// $Id: G4Mag_SpinEqRhs.hh,v 1.11 2006/06/29 18:23:09 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
//
// class G4Mag_SpinEqRhs
//
// Class description:
//
// This is the equation of motion for a particle with spin in a pure
// magnetic field. The three components of the particle's spin are
// treated utilising BMT equation.

// History:
// - Created: J.Apostolakis, P.Gumplinger - February 8th, 1999.
// --------------------------------------------------------------------

#ifndef G4MAG_SPIN_EQRHS
#define G4MAG_SPIN_EQRHS

#include "G4Types.hh"
#include "G4Mag_EqRhs.hh"

class G4MagneticField;

class G4Mag_SpinEqRhs : public G4Mag_EqRhs
{
   public:  // with description

     G4Mag_SpinEqRhs( G4MagneticField* MagField );
    ~G4Mag_SpinEqRhs();
       // Constructor and destructor. No actions.

     void SetChargeMomentumMass(G4double particleCharge, // in e+ units
                                G4double MomentumXc,
                                G4double mass); 

     void EvaluateRhsGivenB( const  G4double y[],
                             const  G4double B[3],
                                    G4double dydx[] ) const;
       // Given the value of the magnetic field B, this function 
       // calculates the value of the derivative dydx.

     inline void SetAnomaly(G4double a) { anomaly = a; }
     inline G4double GetAnomaly() const { return anomaly; }
       // set/get magnetic anomaly

   private:

     G4double omegac;
     G4double anomaly;
     G4double ParticleCharge;

     G4double E;
     G4double gamma;
     G4double beta;
};

#endif /* G4MAG_SPIN_EQRHS */
