Quasilinear Theory of Ion-Cyclotron-Resonance Heating of Plasmas and Associated Longitudinal Cooling

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Abstract
It is shown from a quasilinear theory that an initially isotropic magnetized plasma will be forced into an anisotropic state in ion-cyclotron-resonance heating. Strong heating of the perpendicular ion temperature and strong cooling of the longitudinal temperature should occur simultaneously. The maximum temperature ratio predicted by the quasilinear theory is in exact agreement with that predicted from the basic thermodynamic arguments by Busnardo-Neto, Dawson, Kamimura, and Lin. Heating by fast hydromagnetic waves is also examined.