Nonlinear Decay and Plasma Heating by a Toroidal Alfven Eigenmode
Nonlinear Decay and Plasma Heating by a Toroidal Alfven Eigenmode
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环形阿尔文本征模的非线性衰变和等离子体加热
DOI：
10.1103/physrevlett.120.135001
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发表时间：
2018
影响因子：
8.6
通讯作者：
Chen W.
中科院分区：
文献类型：
--
作者：
Qiu Z.;Chen L.;Zonca F.;Chen W.
我们从理论上证明了环面alfv<s:1>本征模（TAE）可以在环面等离子体中参数衰减为测地线声学模和动力学TAE。估计TAE振幅对应的阈值条件为。其中，和分别为泵TAE的摄动磁场和平衡磁场。这种新颖的衰变过程，除了有助于能量粒子或粒子驱动的TAE不稳定性的非线性饱和外，还可能有助于加热以及调节热等离子体的传输。
We demonstrate theoretically that a toroidal Alfvén eigenmode (TAE) can parametrically decay into a geodesic acoustic mode and kinetic TAE in a toroidal plasma. The corresponding threshold condition for the TAE amplitude is estimated to be. Here,andare, respectively, the perturbed magnetic field of the pump TAE and the equilibrium magnetic field. This novel decay process, in addition to contributing to the nonlinear saturation of energetic-particle or-particle driven TAE instability, could also contribute to the heating as well as regulating the transports of thermal plasmas.