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Abstract

Low power RF absorption experiments have been carried out on the TCA tokamaks using a complete toroidal antenna structure, with ranges of frequency and wavelength such that the shear Alfven wave can be excited. The general features of the Alfven absorption are in agreement with predictions. Excitation of narrow resonance structures with DELTAomega/omega < 5 % has been observed for the first time. These resonances are attributed to a low n number kink modes to the threshold of the Alfven continuum at the plasma centre. They are observed for mode helicity of the same sign as that of the magnetic field.

Additional information

Authors: DE CHAMBRIER A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);CHEETHAM A D, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);HEYM A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);HOFMANN F, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);JOYE B, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);KELLER R, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);LIETTI A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);LISTER J B, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);POCHELON A CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND), CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)
Bibliographic Reference: PLASMA PHYSICS, VOL. 24 (1982), NO. 8, PP. 893-902
Record Number: 1989123048200 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en