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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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