Effects of plasma nonuniformity on toroidal Alfvén eigenmode nonlinear decay
Nuclear Fusion(2024)
摘要
The parametric decay of toroidal Alfvén eigenmode (TAE) in nonuniform
plasmas is investigated using nonlinear gyrokinetic equation. It is found that,
the plasma nonuniformity not only significantly enhances the nonlinear coupling
cross-section, but also qualitatively modifies the decay process. Specifically,
the condition for spontaneous decay becomes the toroidal mode number of the
sideband TAE being higher than that of the pump TAE, instead of the frequency
of the sideband TAE being lower than the pump TAE in uniform plasmas. The
consequences on TAE saturation and energetic particle transport are also
discussed.
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