Discrete Afven eigenmodes excited by energetic particles in JT-60U and JT-60SA
AbstractAbstract
[en] Resonant excitations of Afven eigenmodes by energetic particles in JT-60U and JT-60SA are investigated employing a gyrokinetic-magnetohydrodynamic (MHD) hybrid simulation code. It is found that multiple branches of αTAEs can be kinetically destabilized by energetic particles. The dependences of stability properties on energetic-particle beam velocity via resonance conditions are examined. The discrete Afven eigenmodes in high βp grassy ELM H mode regime are easier to be excited by energetic particles than in high βp gaint ELM H mode regime. The discrete Afven eigenmodes excited by energetic particles are shown to exist in different potential wells in reversed magnetic shear discharges with an L-mode edge. The kinetically excited αTAE instabilities are also found in high βp full non-inductive operation in JT-60SA. The global αTAE features are demonstrated along the magnetic field line and the radial direction. (authors)
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8 figs., 26 refs.
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Journal Article
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Nuclear Fusion and Plasma Physics; ISSN 0254-6086; ; v. 33(2); p. 113-120
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