Two novel nonlinear mode coupling processes for reversed shear Alfvn eigenmode (RSAE) nonlinear saturation are proposed and investigated. In the first process, the RSAE nonlinearly couples to a co-propagating toroidal Alfvn eigenmode (TAE) with the same toroidal and poloidal mode numbers, and generates a geodesic acoustic mode. In the second process, the RSAE couples to a counter-propagating TAE and generates an ion acoustic wave quasi-mode. The condition for the two processes to occur is favored during current ramp. Both the processes contribute to effectively saturate the Alfvnic instabilities, as well as nonlinearly transfer of energy from energetic fusion alpha particles to fuel ions in burning plasmas.

针对反向剪切Alfvn本征模(RSAE)非线性饱和，提出并研究了两种新颖的非线性模耦合过程。在第一个过程中，RSAE 非线性耦合到具有相同环形和极向模式数的共同传播环形 Alfvn 特征模式 (TAE)，并生成测地线声学模式。在第二个过程中，RSAE 耦合到反向传播的 TAE 并产生离子声波准模式。在电流斜坡期间，这两个过程发生的条件是有利的。这两个过程都有助于有效地使 Alfvnic 不稳定性饱和，以及能量从高能聚变 α 粒子非线性转移到燃烧等离子体中的燃料离子。