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首页> 外文期刊>Plasma physics and controlled fusion >Simulation of the eigenmode spectrum below the Toroidicity-induced Alfven eigenmode gap generated by the coupling of Alfven and slow-magnetosonic waves in tokamaks
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Simulation of the eigenmode spectrum below the Toroidicity-induced Alfven eigenmode gap generated by the coupling of Alfven and slow-magnetosonic waves in tokamaks

机译：由托克马克斯耦合和慢磁音波耦合产生的环形诱导的Alfven eIgenmode间隙的模拟。

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The discrete Alfven Eigenmode spectrum below the TAE frequency is studied for hybrid and sawtooth scenarios in tokamaks whereby the full coupling between the Alfven 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 Alfven-Slow Eigenmodes (ASE). For the hybrid scenarios (central q approximate to 2 up to rho approximate to 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 scenarios with central q < 1 (sawtoothing plasmas) modes were found outside the q= 1 surface that are consistent with observations in contrast to the conventional BAE which is located at the q= 1 surface. The frequency behaviour of the modes below the TAE gap was studied for a reversed shear q-profile in which q(min) was varied and it was found that ASEs frequencies increase and/or decrease as a function of q(min) thereby emerging from and/or disappearing into the continuum.
机译：在Tokamak中研究了TAE频率以下的离散Alfven特征模型谱，从而考虑了Alfven和慢磁性波之间的完全耦合。在这种频率方案中，上施加的慢速声逼近是无效的，并且最近称该频率制度中的模式称为Alfven-Slow EigenModes（ASE）。对于混合场景（近2至rhO近似的Central Q近似为0.6），发现了依赖于等离子体压力和磁性剪切的丰富的特征模点。结果发现，TAE间隙以下的模式数是弱逆转的Q型材的最高，而模式的数量随压力而增加。对于零中央剪切Q-剖面，模式的数量低于反转剪切壳体，而对于正常的剪切混合Q-剖面，eIgenMode的数量首先增加，随着越来越大的压力，随后是尖端的数量下降。对于具有中央Q <1（锯齿化等离子体）的等离子体场景，在Q = 1表面之外发现与与位于Q = 1表面的常规BAE相反的观察结果一致。研究了TAE间隙以下模式的频率特性，用于反转的剪切Q-曲线，其中Q（min）变化，发现ASE频率随着Q（min）的函数而增加和/或减少和/或消失进入连续体。

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