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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., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);ALI-ARSHAD S ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: EN (1994) 8 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199411576 / Last updated on: 1995-01-10
Original language: en
Available languages: en