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Abstract

Observations of nearly zero toroidal current in the central region of tokamaks (the "current hole") raise the question of the existence of toroidal equilibria with very low or reversed current in the core. The solutions of the Grad-Shafranov equilibrium equation with hollow toroidal current density profile including negative current density in the plasma centre are investigated. Solutions of the corresponding eigenvalue problem provide simple examples of such equilibrium configurations. More realistic equilibria with toroidal current density reversal are computed using a new equlibrium formulation and computational algorithm which do not assume nested magnetic surfaces.

Additional information

Authors: VILLARD L, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);MARTYNOV A A, Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow (RU);MEDVEDEV S Y, Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow (RU)
Bibliographic Reference: EPFL Internal report LRP 755/03, March 2003, pp.6.
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747
Record Number: 200316329 / Last updated on: 2003-05-30
Category: PUBLICATION
Original language: en
Available languages: en