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Collisionless damping of geodesic acoustic modes

Published online by Cambridge University Press:  20 December 2006

H. SUGAMA
Affiliation:
National Institute for Fusion Science/Graduate University for Advanced Studies, Toki 509-5292, Japan
T.-H. WATANABE
Affiliation:
National Institute for Fusion Science/Graduate University for Advanced Studies, Toki 509-5292, Japan

Abstract

Collisionless time evolutions of geodesic acoustic modes (GAMs) in tokamaks are investigated by the gyrokinetic theory and simulation. It is shown that the collisionless damping of the GAM oscillations is enhanced when the ratio of the typical drift orbit width of passing ions to the radial wavelength of the zonal flow increases.

Type
Papers
Copyright
2006 Cambridge University Press

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