Abstract
We implanted in the ERATO spectral code [1] the stability criterion for ballooning modes (toroidal wave numbern→∞) [2]. The study of ballooning waves located around a given magnetic surface reduces itself to the investigation of the sign of the potential energy on this surface; this method avoids the determination of eigenvalues which is expensive in computing time. The stability criterion obtained by this way has been applied to a high-beta equilibria family proposed for JET. The stability limit found is more constraining than the limit for low-n internal modes.
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