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The theory of relaxed magnetised plasmas in arbitrary highly conducting vessels is extended to external magnetic fields whose field lines intersect the wall. The relaxed state obeys the same differential equations as in the simpler case B(n) = 0, the only difference being in the boundary conditions. As a result, the saturated current is independent of B(n), and the entire parameter interval between largest negative and smallest positive eigenvalues becomes accessible, regardless of the topology of the vessel. The magnetic field of the relaxed state is computed in a large aspect ratio circular torus with an external octupole field modelling that in the Extrap experiment. It is shown that field reversal is inhibited along parts of the boundary, if the octupole is strong enough to generate magnetic X points within the vessel.

Additional information

Authors: SPIES G O, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);LI J, Royal Institute of Technology, Stockholm (SE)
Bibliographic Reference: Article: Physics of Plasmas, Vol. 1 (1994) No. 9, pp. 2901-2907
Record Number: 199411438 / Last updated on: 1994-12-06
Original language: en
Available languages: en