Nonlinear excitations of zonal structures by toroidal Alfvén eigenmodes.
Nonlinear excitations of zonal structures by toroidal Alfvén eigenmodes.
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DOI：
10.1103/physrevlett.109.145002
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发表时间：
2012-10
影响因子：
8.6
通讯作者：
Liu Chen;F. Zonca
中科院分区：
文献类型：
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作者：
Liu Chen;F. Zonca
众所周知，带状流，更一般地说，带状结构在微观漂移波型湍流的动力学中发挥着重要的自我调节作用。由于环形阿尔文本征模 (TAE) 在燃烧聚变等离子体的阿尔文波不稳定性中起着至关重要的作用，因此了解和评估层流和结构对 TAE 非线性动力学的可能作用非常重要。结果表明，有限振幅TAE（包括适当的俘获离子响应）更容易引起带状流或结构自发激发，从而导致带状结构由带状电流而不是通常的带状流主导。这项工作表明，正确考虑等离子体平衡几何形状以及在阿尔夫尼模式的非线性模拟中包括动力学热离子处理是与实验测量进行实际比较的重要组成部分，其中已经清楚地观察到了带状场的存在。
Zonal flows and, more generally, zonal structures are known to play important self-regulatory roles in the dynamics of microscopic drift-wave-type turbulences. Since toroidal Alfvén eigenmode (TAE) plays crucial roles in the Alfvén wave instabilities in burning fusion plasmas, it is, thus, important to understand and assess the possible roles of zonal flow and structures on the nonlinear dynamics of TAE. It is shown that zonal flow or structure spontaneous excitation is more easily induced by finite amplitude TAEs including the proper trapped-ion responses, causing the zonal structure to be dominated by the zonal current instead of the usual zonal flow. This work shows that proper accounting for plasma equilibrium geometry as well as including kinetic thermal ion treatment in the nonlinear simulations of Alfvénic modes are important ingredients for realistic comparisons with experimental measurements, where the existence of zonal fields has been clearly observed.