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Abstract

The study of the dynamic plasma response is applied here to the TCA plasma. Essentially the dynamic response has been measured from the electron temperature deduced from the emission of X-rays from the strength of Alfvèn wave heating on the one hand and by the injection of gas into a purely ohmic regime on the other. The analysis of the dynamic response by the Shafranov parameter shows that the temperature perturbation is associated with a modification of the current profile. It is thus possible to establish that the behaviour of the electron temperature is entirely determined by the current profile and does not depend on a possible modification of the profile of energy deposition of the Alfvèn wave. More specifically the phenomena of energy transport are not associated with the process of convection but rather with a process of diffusion. The profile of the phase of this response can be explained in terms either of a narrow zone close to the surface q=1 where the thermal conductivity is reduced by one order of magnitude or of a change in the transport coefficients in the same region.

Additional information

Authors: MORET J M, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Report: LRP 358/88 EN (1988)
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
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