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Published on: May 25, 2021
Grad-Shafranov equilibria with negative core toroidal current in Tokamak plasmas
Paulo Rodrigues1, João P S Bizarro
1Centro de Fusão Nuclear, Associação Euratom--IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal. par@cfn.ist.utl.pt
Abstract:
Numerical Grad-Shafranov (GS) equilibria with negative current density in the plasma core are computed which do not impose any particularly chosen models for the pressure and current-density profiles. This flexibility allows the profiles to be tailored so that an island unfolds in the low-field side, even for elongated plasmas, thus sustaining the negative-current core against outward forces. Among other topological results, reversed GS equilibria are also shown to be necessarily non-nested, except for the cylindrical and other very special degenerate, hence structurally unstable cases.
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