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The newly installed JET Alfvén Eigenmodes (AE) active diagnostic is described along with the first experimental results. The aim of this diagnostic, which is based on external antenna excitation and synchronous detection of the plasma response, is a systematic study of the AE properties, in particular in terms of damping and stability. Direct information on frequencies, mode structures and, most importantly, damping rates of the excited global resonances can be obtained. TAE modes have been excited and identified by the dependence of their frequency upon magnetic field and density. The first direct measurements of the AE damping rates in different regimes corresponding to distinct dominant absorption mechanisms are reported.

Additional information

Authors: FASOLI A ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH);ALI-ARSHAD S ET AL, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Article: Proceedings of the 15th International Conference on Plasma Physics and Controlled Nuclear Fusion Research (1996) pp. 405-412
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