The effect on coupling of an evanescent layer in front of ion cyclotron fast-wave antennas is commonly described by the exponential factor exp(−2 k ‖ d ), with k ‖ the parallel wave vector of the peak of the launched wave spectrum and d the width of the evanescence layer. With an elementary one-dimensional model, we demonstrate that this dependence is too pessimistic, as confirmed by recent experiments.
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Bilato et al. (2005) studied this question.
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