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Abstract

The topologic study of a stochastic magnetic field is investigated by the tracing of magnetic field lines. The first method consists of a direct integration of the field line equations. An alternative approach is to invoke the incompressibility of the magnetic field to formulate a Hamiltonian description of the magnetic field lines. The third and last approach consists of building a canonical map that models the magnetic topology. These three different methods are applied to the TEXTOR tokamak device with a magnetic field perturbation driven by the dynamic ergodic divertor (DED) coils and are in agreement with respect to the extent of the island structures near the most relevant resonant surfaces. The perturbed twisted map that was obtained differs from the standard map (radial twist map) and constitutes an efficient method for the determination of the magnetic field line trajectories.

Additional information

Authors: FISCHER O, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);COOPER W A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Plasma Physics Reports (1998)
Record Number: 199810297 / Last updated on: 1998-03-09
Category: PUBLICATION
Original language: en
Available languages: en