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Theory and Computer Simulation Center, National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
Abstract. Particle-magnetohydrodynamic and Fokker-Planck-magnetohydrodynamic
simulations of fast ions and toroidicity-induced Alfvén eigenmodes (TAE
modes) have been carried out. Alpha particle losses induced by TAE mode are
investigated with particle-magnetohydrodynamic simulations. Trapped particles
near the passing-trapped boundary in the phase space are also lost appreciably
in addition to the counter-passing particles. In
Fokker-Planck-magnetohydrodynamic simulation source and slowing-down of fast
ions are considered. A coherent pulsating behavior of multiple TAE modes,
which occurs in neutral beam injection experiments, is observed when the
slowing-down time is much longer than the damping time of the TAE modes and
the fast-ion pressure is sufficiently high. For a slowing-down time comparable
to the damping time, the TAE modes reach steady saturation levels.
IAEA 2001
