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Abstract

Controlled fusion reactions will take place in the plasma core in a thermonuclear reactor operating in continuous mode, whereas the tokamak is a smaller machine with pulsed discharges. For several years, it has been fitted with additional devices generating non-inductive current by means of high-energy electromagnetic waves, enabling the plasma to be sustained longer. The non-inductive current is transported by relativistic electrons responsible for an energy queue in the distribution function parallel to the toroidal magnetic field. Turbulence is a further mechanism which can produce non-Maxwellian distribution functions. A new diagnostic of non-Maxwellian distribution functions was developed and fitted to the Tore Supra tokamak. The method measures the transmission coefficient of a neighbouring wave of the cyclotron electron frequency: the queue of the distribution function, occurring in the expression of the local coefficient of absorption, modifies the spectrum of the power transmitted. This microwave diagnostic is also a means of observing the phenomenon of internal relaxation, normally termed sawtooth instability. The initial results are encouraging.

Additional information

Authors: SEGUI J L, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);GIRUZZI G, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);VEZARD D, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: Troisième Congrès de la Société Français de Physique - Plasma, Nancy (FR), September 16-18, 1992
Availability: Available from (1) as Paper FR 37067 ORA
Record Number: 199211500 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: fr
Available languages: fr