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A detailed knowledge of the current density distributions and the dependencies on the operational conditions are important for both the theoretical understanding and the practical improvement of tokamaks. In this article, the experimental techniques for measuring the current density profile or the associated magnetic fields within the plasma are reviewed. After a brief description of the equilibrium magnetic field configuration in toroidal geometry and a short account of indirect and passive diagnostic methods, an assessment is made of the currently available techniques with respect to the state of development and the results obtained. Since none of the approaches has yet attained the standard of a routine diagnostic, only a few systematic studies have been performed so far, and many observations stem from tests of the conceptual and practical feasibility of various methods.

Additional information

Authors: SOLTWISCH H, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 34 (1992) No. 12, pp. 1669-1698
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