The discrete Alfvén Eigenmode spectrum below the TAE frequency is studied for hybrid and sawtooth scenarios in tokamaks whereby the full coupling between the Alfvén and slow magnetosonic waves are taken into account. In this frequency regime the usally applied slow-sound approximation is not valid and modes in this frequency regime were recently called Alfvén-Slow Eigenmodes (ASE). For the hybrid scenarios (central q ≈ 2 up to ρ ≈ 0.6) a rich spectrum of eigenmodes was found that depend on the plasma pressure and magnetic shear. It was found that the number of modes below the TAE gap is the highest for weakly reversed q profiles while the number of modes increases with pressure. For zero central shear q -profiles the number of modes is lower than in the reversed shear case while for the normal shear hybrid q -profiles the number of eigenmode first increased with increasing pressure followed by a decrease in the number of eigenmodes. For plasma sc...

中文翻译：

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托卡马克中Alfvén与慢磁声波耦合产生的环形性Alfvén本征模隙以下的本征模谱的模拟

针对托卡马克中的混合和锯齿情形，研究了TAE频率以下的离散Alfvén本征模谱，其中考虑了Alfvén与慢磁声波之间的完全耦合。在这种频率范围内，通常应用的慢音近似无效，并且该频率范围内的模式最近被称为Alfvén-慢本征模式（ASE）。对于混合场景（中心q≈2直至ρ≈0.6），发现了取决于等离子体压力和磁切变的丰富的本征模谱。已经发现，对于弱反转的q分布，TAE间隙以下的模式数量最高，而模式数量则随压力而增加。对于零中心剪切q轮廓，模态数量比反向剪切情况下的模态数量少，而对于普通剪切混合q轮廓，特征模态的数量首先随着压力的增加而增加，其次是特征模态的数量减少。用于等离子切割