Diagnosis of the current generated by a lower hybrid wave in a thermonuclear reactor by means of differential transmission of an electron cyclotron wave
In present-day tokamaks the emission of cyclotron waves by electrons can provide information about the tail of superthermic electrons generated by resonant absorption of a wave of lower hybrid frequency. In a high-temperature reactor the emission spectra of the Maxwellian body of the tail are not separated. Taking into account accessibility and the strong Landau effect, the current is confined to the relatively cool plasma periphery. Provided that its wavelength is well chosen, an electron-generated cyclotron wave injected into the plasma can interact with this tail, and also with the Maxwellian central part of the plasma. Transmission thus results from both processes and is therefore no longer solely associated with the tail. The method described makes it possible to overcome this difficulty and to determine the existence of a population of fast electrons generated by a lower hybrid wave under the conditions found in a thermonuclear reactor.
Bibliographic Reference: Paper presented: 2ème Congrès de la Division de Plasma, Orsay (FR), Sept. 3-4, 1990
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Record Number: 199011504 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr