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The effect of the electrostatic potential Phi on the bootstrap current has been calculated and its impact on the global ideal MHD stability of a LHD configuration has been investigated. The bootstrap current can destabilise a m/n=2/3 external kink when it causes the edge rotational transform to approach 1.5. At Phi=0, the unstable m/n=2/3 structure is strongly coupled with a m/n=9/13 term. Negative Phi reduces the edge transform below 1.4 and the m/n=2/3 mode couples with a m/n=5/7 component instead. Positive Phi displaces the edge transform closer to the critical value 1.5 weakening the contribution of toroidal sidebands like m/n=9/13, but deteriating the stability conditions slightly further. Global n=1, n=2 and n=4 modes are basically internal and have smaller growth rates than the n=3 external kink. These structures evolve from interchange-like for n=1 to ballooning-like for n=4.

Additional information

Authors: COOPER W A, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confederation Suisse, Ecole Polytechnique Federale de Lausanne (CH);YAMAZAKI K ET AL, National Institute for Fusion Science, Toki (JP)
Bibliographic Reference: An article published in: Journal of Plasma Fusion Research, Vol. 4 (2001), pages 418-421.
Availability: Website of journal publisher:
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