Fundamental heating with stellarator wave modes Available to Purchase

A perturbation method has been developed to find the structure of the mode in a cylindrical waveguide filled with a cold, uniform plasma with vacuum layer between the plasma and conducting wall when the magnetic field in the waveguide is a superposition of a uniform and an inhomogeneous field created by $l=2$ helical windings. The influence of the magnetic field nonuniformity on the wave mode structure is treated as a perturbation. The wave structure of a modified $m=+1$ fast Alfvén wave in the vicinity of the ion cyclotron frequency is examined numerically for a collisionless plasma. It is shown that the $m=−1$ harmonic of the modified $m=+1$ fast Alfvén wave is left-hand polarized in the central part of the plasma. This can be considered as a coupling between the $m=+1$ fast (right-hand polarized) wave and $m=−1$ slow (left-hand polarized) wave which is due to the inhomogeneity of the $l=2$ fields. The coupling efficiency is examined numerically for different parameters of the waveguide.