NIFS-563

FULL TEXT (PDF, 316 KB)


Author(s):

Y. Todo and T. Sato

Title:

Kinetic-Magnetohydrodynamic Simulation Study of Fast Ions and Toroidal Alfven Eigenmodes

Date of publication:

Oct. 1998

Key words:

IAEA, fusion energy conference, Yokohama

Abstract:

Particle-magnetohydrodynamic and Fokker-Planck-magnetohydrodynamic simulations of fast ions and toroidicity-induced Alfven eigenmodes (TAE modes) have been carried out. Alpha particle losses induced by TAE mode are investigated with particle-magnetohydrodynamic simulatlons. 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.

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