G4EqEMFieldWithSpin.hh

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// G4EqEMFieldWithSpin
//
// Class description:
//
// This is the right-hand side of equation of motion in a combined
// electric and magnetic field.
 
// Authors: Chris Gong & Peter Gumplinger (TRIUMF), 30.08.2007
// -------------------------------------------------------------------
#ifndef G4EQEMFIELDWITHSPIN_HH
#define G4EQEMFIELDWITHSPIN_HH
 
#include "G4ChargeState.hh"
#include "G4EquationOfMotion.hh"
 
class G4ElectroMagneticField;
 
/**
 * @brief G4EqEMFieldWithSpin implements the right-hand side of equation
 * of motion in a combined electric and magnetic field.
 */
 
class G4EqEMFieldWithSpin : public G4EquationOfMotion
{
  public:
 
    /**
     * Constructor for G4EqEMFieldWithSpin.
     *  @param[in] emField Pointer to the electromagnetic field.
     */
    G4EqEMFieldWithSpin(G4ElectroMagneticField* emField );
 
    /**
     * Default Destructor.
     */
    ~G4EqEMFieldWithSpin() override = default;
 
    /**
     * Sets the charge, momentum and mass of the current particle.
     * Used to set the equation's coefficients.
     *  @param[in] particleCharge Magnetic charge and moments in e+ units.
     *  @param[in] MomentumXc Particle momentum.
     *  @param[in] mass Particle mass.
     */
    void SetChargeMomentumMass(G4ChargeState particleCharge, // in e+ units
                               G4double MomentumXc,
                               G4double mass) override;
 
    /**
     * Calculates the value of the derivative, given the value of the
     * electromagnetic field.
     *  @param[in] y Coefficients array.
     *  @param[in] Field Field value.
     *  @param[out] dydx Derivatives array.
     */
    void EvaluateRhsGivenB(const G4double y[],
                           const G4double Field[],
                                 G4double dydx[] ) const override;
 
    /**
     * Setter and getter for magnetic anomaly.
     */
    inline void SetAnomaly(G4double a) { anomaly = a; }
    inline G4double GetAnomaly() const { return anomaly; }
 
    /**
     * Returns the equation type-ID, "kEqEMfieldWithSpin".
     */
    inline G4EquationType GetEquationType() const override { return kEqEMfieldWithSpin; }
 
  private:
 
    G4double charge{0.}, mass{0.}, magMoment{0.}, spin{0.};
 
    G4double fElectroMagCof{0.};
    G4double fMassCof{0.};
 
    G4double omegac{0.}, anomaly{0.0011659208};
    G4double beta{0.}, gamma{0.};
};
 
#endif