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Abstract

This article discusses an investigation of the topological modification of an equilibrium with nested magnetic flux surfaces computed with the free boundary VMEC code subject to an applied magnetic field perturbation. Magnetic field lines are traced in the domain interior to the plasma-vacuum interface either in the coordinates of the variational moments equilibrium code (VMEC) code or using canonical coordinates that allow a Hamiltonian description of the magnetic field lines. The perturbation models the effect of the magnetic flux leakage from the saturated iron core of the Joint European Torus (JET) device. Island formation around resonant surfaces near the boundary is observed, but these islands do not overlap. The Chirikov parameters and the Liapunov exponents that are specifically calculated verify this.

Additional information

Authors: FISCHER O, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse (CH);COOPER W A, École Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse (CH)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion (1997)
Record Number: 199711550 / Last updated on: 1997-12-09
Category: PUBLICATION
Original language: en
Available languages: en