Community Research and Development Information Service - CORDIS

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 with the help of the Hamiltonian that models the magnetic topology without approximations; this is a general map.

These three methods are applied to the TEXTOR tokamak device with a magnetic field perturbation driven by the Dynamic Ergodic Divertor (DED) coils. The DED coils are aligned to approximately coincide with the pitch of the field lines on the i = 1/3 rational surface. The coil arrangement consists of 16 helical conductors carrying a current I(j) such the perturbed fields generated have a structure dominated by the m = 6, n = 2 or m = 3, n = 1 component where m(n) is the poloidal (toroidal) mode number. The numerical results show the general map does not correspond to the standard map and that these three different methods yield similar results in the determination of the magnetic filed lines. .

Additional information

Authors: FISCHER O, Centre de Recherches en Physique de Plasmas, Association EURATOM, Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);COOPER W A, Centre de Recherches en Physique de Plasmas, Association EURATOM, Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: 1998 International Congress on Plasma Physics, 25th EPS Conference on Controlled Fusion and Plasma Physics, Prague (CZ), June 29 � July 3, 1998
Record Number: 199811270 / Last updated on: 1998-10-27
Category: PUBLICATION
Original language: en
Available languages: en
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top