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The application of the CAS3D free-boundary stability code to a set of finite-beta W7-AS plasma configurations, computationally generated from the W7-AS coil data, shows that unstable, radially extended free-boundary modes exist in equilibria of this set, for which the local Mercier stability criterion detects stability. This is in contrast to the behaviour of the fixed-boundary modes, for which the point of marginal stability approximately coincides with the one given by the local stability analysis.

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Authors: MERKEL P, Max-Planck-Institut für Plasmaphysik, Greifswald (DE);NUHRENBERG C, Max-Planck-Institut für Plasmaphysik, Greifswald (DE);COOPER W A, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas (1996) pp. 51-58
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