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Abstract

At present, to apply ECRH to tokamak plasms at higher densities, outside launch of the waves can be used only if the heating is performed at higher harmonics of the electron cyclotron frequency, or if the fundamental wave ? is injected obliquely to the obliquely to the B field near an optimal angle. In the latter case, the O-mode will be converted into an x-mode at the critical density. The X-mode propagates outwards to the upper hybrid resonance (uhr) layer where it is converted into an electrostatistic Bernstein (B) mode which propagates inwards until it is completely absorbed near the electron cyclotron resonance (ecr) layer in the centre of the tokamak. This O-X-B mode conversion scheme is studied by ray tracing calculations in full three dimensional toroidal geometry using the dispersion function for a hot, non-relativistic plasma. Radial power deposition profiles for the Bernstein waves generated by realistic antenna radiation patterns have been calculated. In addition to the results for the Danish tokamak DANTE, results relevant to PLT are presented.

Additional information

Authors: HANSEN F R, RISOE NATIONAL LABORATORY, ROSKILDE (DENMARK);LYNOV O P, RISOE NATIONAL LABORATORY, ROSKILDE (DENMARK);MICHELSEN P RISOE NATIONAL LABORATORY, ROSKILDE (DENMARK), RISOE NATIONAL LABORATORY, ROSKILDE (DENMARK)
Bibliographic Reference: COURSE AND WORKSHOP ON APPLICATIONS OF RF WAVES TO TOKAMAK PLASMAS, VILLA MONASTERO, VARENNA (ITALY), SEPT. 5-14, 1985 PP. 764-775, VOL. II 908 P., 1985, VOL. I AND VOL. II WRITE TO MONOTYPIA FRANCHI, VIALE UMBRIA 28/C, 06012 CITTA DI CASTELLO, PERUGIA (I
Record Number: 1989124100200 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en