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Abstract

The ideal internal kink mode is one of possible triggers of sawtooth oscillations and it is important to know the stability of ideal internal kink to be able to predict the behavior of sawteeth.

The numerous theoretical studies of the internal kink behavior in tokamak plasmas have provided several analytical approximations for the dependence of the internal kink growth rate on plasma parameters. These approximations are obtained for the standard parabolic profiles and only elongation is taken into account. However the experimental results of TCV tokamak show that the sawtooth activity depends on elongation and triangularity.

The real plasmas of TCV tokamak are well beyond the mentioned constrictions and the behavior of ideal kink mode should be studied by means of numerical ideal MHD codes. Aiming at a better understanding of internal kink stability and, thus, of sawteeth activity in TCV plasmas, we have undertaken the study of the dependence of the internal kink stability on plasma shape and current in a wide range of these parameters. The first results let us to propose some corrections to the analytic formulae allowing a better description of the dependence on triangularity. ty.

Additional information

Authors: MARTYNOC A, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH);SAUTER O, Centre de Recherches en Physique des Plasmas, EURATOM Association-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH)
Bibliographic Reference: An article published in: Theory of Fusion Plasmas (2000), pp.387-392
Record Number: 200013676 / Last updated on: 2001-09-18
Category: PUBLICATION
Original language: en
Available languages: en
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