Direct Measurement of the Damping of Toroidicity-Induced Alfven Eigenmodes

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

doi:10.1103/PhysRevLett.75.645

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

1995

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Abstract

This Letter presents the first direct experimental measurements of the damping of toroidicity-induced Alfven 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) less than or equal to gamma/omega less than or equal to 10(-1), have been identified in Ohmically heated plasma discharges.