Abstract
Ballooning and radially localised interchange mode growth rates in the vicinity of the magnetic axis of an axisymmetric toroidal configuration are obtained by applying a multiple scale averaging method to the large mode number ideal MHD dispersion equations. The nature of the spectrum of these two kinds of instabilities is shown, as well as its behaviour at the transition points between them. The effects of the mode compressibility and parallel inertia are taken into account, and a mode conversion phenomenon between Alfven-like and slow magnetosonic-like disturbances is observed.
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