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Synergistic effect of Coriolis and centrifugal forces from poloidal flow on internal kink and fishbone modes in tokamak plasmas
Physics of Plasmas ( IF 2.2 ) Pub Date : 2020-09-01 , DOI: 10.1063/5.0010406
Weichao Xie 1
Affiliation  

The synergy of Coriolis force and centrifugal force is proposed to study the influence of poloidal plasma rotation on internal kink and fishbone modes. A new dispersion relation is established by making use of energy principle when Coriolis and centrifugal forces are taken into account in the momentum equation. The significant discovery is that the destabilizing (stabilizing) effect of poloidal flow on internal kink (fishbone) mode is greatly increased due to the synergy of Coriolis and centrifugal forces. Poloidal flow can neither effectively destabilize internal kink mode nor stabilize fishbone mode with any one of both centrifugal force and Coriolis force being excluded. It is most interesting that the internal kink mode, being stable with positive δWc (perturbed potential energy of bulk plasma), is unstable when poloidal rotation frequency exceeds a threshold. It is difficult for poloidal flow without shear to destabilize the internal kink mode with δWc > 0. The physical mechanism of poloidal flow destabilization of internal kink mode mainly comes from the modification of plasma inertial due to Coriolis and centrifugal forces.

中文翻译:

科里奥利和极向流动的离心力对托卡马克血浆中内部扭结和鱼骨模式的协同作用

提出了科里奥利力和离心力的协同作用,以研究多倍体等离子体旋转对内部扭结和鱼骨模式的影响。当动量方程中考虑了科里奥利力和离心力时,利用能量原理建立了一个新的色散关系。重大发现是由于科里奥利力和离心力的协同作用,极大地增加了极向流动对内部扭结(鱼骨)模式的去稳定作用。极向流动既不能有效地破坏内部扭结模式,也不能稳定鱼骨模式,而离心力和科里奥利力都不能排除。这是最有趣的是,内扭曲模式,是与积极的稳定δW Ç(体等离子体的扰动势能)在极向旋转频率超过阈值时不稳定。是很困难的极向流动而不剪切破坏该内扭曲模式δW Ç > 0的内扭曲模式的极向流动不稳定的物理机制主要来源于血浆惯性由于科里奥利和离心力的修改。
更新日期:2020-09-30
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