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This paper compares the stability behaviour of the W7-AS stellarator and a HELIAS (helical advanced stellarator) configuration with W7-X parameters with respect to ballooning modes. The results are based on the evaluation of a fourth order magnetic differential equation along closed magnetic field lines. The numerical procedure applies a variational approach which uses the Garching resistive ballooning code, GARBO. This analysis, which concerns purely growing modes, shows that the favourable stability properties of W7-X persist in the resistive regime. The destabilising effect of resistivity is largely compensated by the stabilising contribution of plasma compression. For the W7-AS, greater resistive effects were found, in a configuration that was already much more unstable.

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Authors: KAISER R, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 33 (1993) No. 9, pp. 1281-1291
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