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A new code, magnetic field solver for finite-beta equilibria (MFBE), has been developed. It computes the magnetic field in a form suitable for field line tracing inside and outside the plasma boundary of finite-beta Helias equilibria calculated with the NEMEC free boundary equilibrium code. Coupling of the NEMEC and MFBE codes allows a determination of the last closed magnetic surface. For various beta values up to 0.04, the variations of the island sizes and positions outside the plasma boundary and the ergodization of the edge region are studied for a helical advanced stellarator (Helias) configuration.

Additional information

Authors: STRUMBERGER E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 37 (1997) No.1, pp. 19-27
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