Excitation of Flow-Stabilized Resistive Wall Mode by Coupling with Stable Eigenmodes in Tokamaks
Excitation of Flow-Stabilized Resistive Wall Mode by Coupling with Stable Eigenmodes in Tokamaks
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通过与托卡马克稳定本征模耦合激励流动稳定电阻壁模式
DOI：
10.1103/physrevlett.114.065001
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Makoto Hirota
中科院分区：
文献类型：
--
作者：
Nobuyuki Aiba;Makoto Hirota
在被电阻壁包围的旋转环形等离子体中，通过电阻壁模式（RWM）和稳定的理想MHD模式之间的耦合可以激发线性MHD不稳定性。特别地，证明了RWM不仅可以与稳定的外部扭结模式耦合，而且可以与通常在环形等离子体稳定连续体中的alfv<s:1>本征模式耦合。当由等离子体旋转引起的多普勒频移抵消理想MHD模式的频率时，RWM增长率达到峰值，因此该模式在实验室帧中似乎具有零频率。在这些旋转频率值下，RWM可以克服等离子体旋转、连续介质阻尼和离子朗道阻尼的稳定作用。
In a rotating toroidal plasma surrounded by a resistive wall, it is shown that linear MHD instabilities can be excited by couplings between the resistive wall mode (RWM) and stable ideal MHD modes. In particular, it is shown that the RWM can couple not only with stable external kink modes but also with Alfvén eigenmodes that are ordinarily in the stable continuum of a toroidal plasma. The RWM growth rate is shown to peak whenever the Doppler shift caused by the plasma rotation cancels the frequency of an ideal MHD mode, so that the mode appears to have zero frequency in the laboratory frame. At these values of the rotation frequency, the RWM can overcome the stabilizing effects of plasma rotation, continuum damping, and ion Landau damping.