Direct Measurement of the Damping of Toroidicity-Induced Alfvén Eigenmodes

A. Fasoli; D. Borba; G. Bosia; D. J. Campbell; J. A. Dobbing; C. Gormezano; J. Jacquinot; P. Lavanchy; J. B. Lister; P. Marmillod; J.-M. Moret; A. Santagiustina; S. Sharapov

doi:10.1103/PhysRevLett.75.645

Direct Measurement of the Damping of Toroidicity-Induced Alfvén Eigenmodes

A. Fasoli, D. Borba, G. Bosia, D. J. Campbell, J. A. Dobbing, C. Gormezano, J. Jacquinot, P. Lavanchy, J. B. Lister, P. Marmillod, J.-M. Moret, A. Santagiustina, and S. Sharapov

Phys. Rev. Lett. 75, 645 – Published 24 July 1995

Abstract

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, $10^{- 3} \leq γ / ω \leq 10^{- 1}$ , have been identified in Ohmically heated plasma discharges.

Received 30 January 1995

DOI:https://doi.org/10.1103/PhysRevLett.75.645

Authors & Affiliations

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