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(TH2/3) High and Low Frequency Alfvén Modes in Tokamaks

S. Briguglio, L. Chen¹, J. Q. Dong², G. Fogaccia, R. A. Santoro³, G. Vlad, F. Zonca

Associazione EURATOM-ENEA sulla Fusione, C.P. 65, 00044 Frascati, Rome, Italy
¹ Department of Physics and Astronomy, University of California, Irvine, CA 92697-4575, U.S.A.
² Southwestern Institute of Physics, Chengdu, China
³ Naval Research Laboratory, Washington, D.C. 20375, U.S.A.

Abstract.  We present an analysis of the typical features of shear Alfvén waves in tokamak plasmas in a frequency domain ranging from the ``high'' frequencies ( $\omega$ $\cong$ v<sub>A</sub>/2qR<sub>0</sub>; v<sub>A</sub> being the Alfvén speed and qR<sub>0</sub> the tokamak connection length) of the toroidal gap to the ``low'' frequencies, comparable with the thermal ion diamagnetic frequency, $\omega_{*pi}^{}$ and/or the thermal ion transit frequency $\omega_{ti}^{}$ = v_ti/qR₀ (v_ti being the ion thermal speed).

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