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Physics of Plasmas -- April 1995 -- Volume 2, Issue 4 pp. 1029-1031

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Existence of core localized toroidicity-induced Alfvén eigenmode

G. Y. Fu
Princeton Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543

(Received 4 November 1994; accepted 22 December 1994)

The core-localized toroidicity-induced Alfvén eigenmode (TAE) is shown to exist at finite plasma pressure due to finite aspect ratio effects in tokamak plasma. The new critical beta for the existence of the TAE mode is given by alpha[approximately-equal-to]3epsilon+2s2, where epsilon=r/R is the inverse aspect ratio, s is the magnetic shear and alpha=–Rq2dbeta/dr is the normalized pressure gradient. In contrast, previous critical alpha is given by alpha[approximately-equal-to]s2. In the limit of s<<[square root of]r/R, the new critical alpha is greatly enhanced by the finite aspect ratio effects. ©1995 American Institute of Physics.


DOI: 10.1063/1.871382
PACS: 52.35.Bj, 52.55.Fa, 52.55.Pi        Additional Information


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