Abstract
It is shown that the growth rate of the MHD instability in toroidal configurations is slower in a situation in which the Bernstein-Kadomtsev condition is satisfied while the Mercier stability criterion is not. Under the Bernstein-Kadomtsev condition, Alfvénic Mercier modes are not excited, but quasi-flute acoustic Mercier modes develop instead. In confinement systems with closed magnetic field lines, the Bernstein-Kadomtsev condition ensures MHD stability; however, a small rotational transform produced by magnetic perturbations can give rise to a quasi-flute acoustic instability whose growth rate is proportional to the perturbation amplitude, in which case the fastest growing oscillations are those with the shortest wavelengths.
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Translated from Fizika Plazmy, Vol. 30, No. 3, 2004, pp. 269–276.
Original Russian Text Copyright © 2004 by Zvonkov, Skovoroda.
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Zvonkov, A.V., Skovoroda, A.A. Stability of a quasi-flute mode under the Bernstein-Kadomtsev condition in a toroidal confinement system. Plasma Phys. Rep. 30, 241–248 (2004). https://doi.org/10.1134/1.1687026
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DOI: https://doi.org/10.1134/1.1687026