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Abstract

Results from the first experiments to drive Alfvén eigenmodes (AE) with antennas external to a tokamak plasma are presented. In ohmically heated plasma discharges, direct experimental measurements of the damping of toroidicity induced AE (TAE) have allowed an identification of different regimes corresponding to different dominant TAE absorption mechanisms with a wide range of damping rates. In plasmas heated by ion cyclotron resonance heating, neutral beam injection heating, lower hybrid heating and high plasma current ohmic heating, a new class of weakly damped Alfvén eigenmodes, the kinetic Alfvén eigenmodes, predicted in theoretical models which include finite Larmor radius and finite parallel electric field effects, has been identified experimentally.

Additional information

Authors: FASOLI A ET AL., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);SHARAPOV S ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);HOLTIES H A, FOM Instituut voor Plasmafysica, Rijnhuizen, Nieuwegein (NL)
Bibliographic Reference: Report: LRP 519/95 EN (1995) 17 pp.
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: 199510923 / Last updated on: 1995-08-10
Category: PUBLICATION
Original language: en
Available languages: en