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On the fast waves in a cylindrical current-carrying plasma

The influence of a stationary Ohmic current on the radial structure of fast waves in a cylindrical current-carrying plasma is discussed. To evaluate the dispersion equation for fast waves, they used the dielectric tensor taking into account the radial current structure and geometry of a confining helical magnetic field by the plasma safety factor. It is shown that the dispersion characteristics of fast waves in a current-carrying plasma differ from those for an equilibrium plasma column in a homogeneous magnetic field nearby the cutoffs and resonances due to the rotational transformation (including shear-effects) of the helical magnetic field lines.