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research article
Stability of Alfven eigenmodes in optimized tokamaks
2000
Alfven eigenmodes (AEs) with intermediate toroidal mode numbers are modelled using the global gyrokinetic PENN code to determine the stability of high performance tokamak discharges in the presence of energetic particles. A large plasma pressure and a weak magnetic shear in the core give rise to radially extended kinetic AEs, which are stabilized by the high shear at the edge of a divertor (X point) configuration. Large values for the safety factor and the ion Larmor radius in reversed shear operation may however trigger drift kinetic Alfven eigenmode instabilities that could affect the alpha particle confinement in a reactor.
Type
research article
Authors
Publication date
2000
Published in
Volume
40
Issue
7
Start page
1343
End page
1348
Peer reviewed
REVIEWED
Available on Infoscience
April 16, 2008
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