Whereas experiments on the ST Tokamak demonstrated fast-Alfv\'en-wave cavity resonances to be sharp and resolvable and suggested highly efficient coupling could be obtained for plasma heating, warm-plasma effects appropriate to fusion plasmas suggest such resonances will not be resolvable and that the characteristic mode structure will be significantly modified through the coupling to ion-Bernstein modes unless the heating is shifted to higher harmonics of the ion-cyclotron frequency.
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Swanson et al. (1975) studied this question.
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