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Abstract

The helical distortion of a plasma with currents in modular Furth-Hartman type coils is demonstrated to produce a transition from axisymmetry to quasisymmetry in a compact toroidal magnetic confinement system when the coil currents approach those in the main toroidal field coils. The local ideal ballooning stability properties deteriorate with increasing helical deformation of the plasma shape because the normal magnetic field line curvature becomes larger in regions where the helical contribution enhances the toroidicity component while the local magnetic shear vanishes. The global external kink stability properties, on the contrary, improve because the normal curvature on average does not change while the local magnetic shear acquires a noticeable helical modulation.

Additional information

Authors: COOPER W A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Federale, Lausanne (CH);TODD T N, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ALLFREY S, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);HENDER T C, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ROBINSON D C, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion (1999)
Record Number: 200011779 / Last updated on: 2000-02-12
Category: PUBLICATION
Original language: en
Available languages: en
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