Elsevier

Physics Letters A

Volume 92, Issue 6, 22 November 1982, Pages 279-282
Physics Letters A

Observation of fast current fluctuations during internal disruptions in TCA by using Alfvén wave diagnostics

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Abstract

Alfvén waves are excited in the TCA tokamak by a fully toroidal antenna structure consisting of eight groups of 3 plates. When the plasma density is ramped during a discharge, the antenna loading shows several peaks of enhanced absorption corresponding to the excitation of discrete Alfvén waves. Internal disruptions produce a modulation of the resonance peaks at the sawtooth frequency which is attributed to q-profile fluctuations. The relative phase between the sawteeth seen on the soft X-ray flux and those on the resonance peaks gives information on the shape of the Alfvén frequency profile.

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