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// $Id: G4EqEMFieldWithSpin.hh,v 1.3 2008/11/14 13:37:09 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
//
// class G4EqEMFieldWithSpin
//
// Class description:
//
// This is the right-hand side of equation of motion in a combined
// electric and magnetic field.

// History:
// - Created. Chris Gong, P.Gumplinger, 30.08.2007
// -------------------------------------------------------------------

#ifndef G4EQEMFIELDWITHSPIN_hh
#define G4EQEMFIELDWITHSPIN_hh

#include "G4EquationOfMotion.hh"

class G4ElectroMagneticField;

class G4EqEMFieldWithSpin : public G4EquationOfMotion
{
  public:  // with description

    G4EqEMFieldWithSpin(G4ElectroMagneticField *emField );

    ~G4EqEMFieldWithSpin();

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

    void EvaluateRhsGivenB(const G4double y[],
                           const G4double Field[],
                                 G4double dydx[] ) const;
      // Given the value of the electromagnetic field, 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 fElectroMagCof ;
    G4double fMassCof;

    G4double omegac;
    G4double anomaly;
    G4double ParticleCharge;
    G4double E;
    G4double gamma;
    G4double beta;

};

#endif /* G4EQEMFIELDWITHSPIN */
