Phys. Rev. Lett. 75, 645–648 (1995)

Direct Measurement of the Damping of Toroidicity-Induced Alfvén Eigenmodes

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A. Fasoli^1,2, D. Borba¹, G. Bosia¹, D. J. Campbell¹, J. A. Dobbing¹, C. Gormezano¹, J. Jacquinot¹, P. Lavanchy^1,2, J. B. Lister^1,2, P. Marmillod^1,2, J.-M. Moret^1,2, A. Santagiustina¹, and S. Sharapov¹
¹JET Joint Undertaking, Abingdon, Oxon OX14 3EA, United Kingdom
²Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

Received 30 January 1995; published in the issue dated 24 July 1995

This Letter presents the first direct experimental measurements of the damping of toroidicity-induced Alfvén eigenmodes (TAE), carried out in the JET tokamak. These measurements were obtained during the first experiments to drive these modes with antennas external to a tokamak plasma. Different regimes corresponding to different dominant TAE absorption mechanisms with a wide range of damping rates, 10^-3≤γ/ω≤10^-1, have been identified in Ohmically heated plasma discharges.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.75.645

DOI:

10.1103/PhysRevLett.75.645

PACS:

52.35.Bj, 52.55.Fa, 52.55.Pi

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Phys. Rev. Lett. 75, 645–648 (1995)

Direct Measurement of the Damping of Toroidicity-Induced Alfvén Eigenmodes