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Abstract

During plasma excitation by high power Alfvén waves in TCA, signals at harmonics of the generator frequency are observed in the plasma scrape-off layer. Experimental investigations of the sheath effect and the excitation efficiency and dispersion properties of these harmonics are reported in this paper. The results indicate that the harmonics arise either directly or indirectly through the driven Alfvén waves and not the sheath effect at the exciting antenna. The RF ion saturation current is observed to have a non-negligible peak amplitude in comparison to the time averaged ion saturation current and may provide evidence of non-linear evolution of the driven Alfvén waves.

Additional information

Authors: BORG G G ET AL., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Report: LRP 477/93 EN (1993)
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
Record Number: 199311066 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en