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Abstract

It has been recently reported that in Tokamak fusion test reactor (TFTR) experiments a mode called the Alfvén Frequency Mode (AFM) is very often seen in neutral beam heated discharges as well as in ohmic plasmas. The frequency scales with the Alfvén frequency near the plasma edge. The mode has a n=0 toroidal mode number and dominant m=+/-1, +/-2 poloidal Fourier components. In this paper the spectrum of n=0 Global Alfvén Eigenmodes (GAE) in cylindrical and toroidal geometries have been calculated. The AFM is shown to be simply a n=0 GAE. It is not induced by toroidicity. Analytical dispersion relations in some typical situations depending on the profile of 1/q{2}p is given. The findings are in agreement with experimental observations so far. The feasibility of the excitations of this mode with the saddle coils in the JET tokamak is predicted.

Additional information

Authors: VILLARD L, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);VACLAVIK J, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Proceedings of the 1996 International Conference on Plasma Physics (ICPP 96) Volume 1 (1997) pp. 162-165
Record Number: 199710979 / Last updated on: 1997-08-14
Category: PUBLICATION
Original language: en
Available languages: en
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