Combined effects of trapped energetic ions and resistive layer damping on the stability of the resistive wall mode

Combined effects of trapped energetic ions and resistive layer damping on the stability of the resistive wall mode
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捕获的高能离子和电阻层阻尼对电阻壁模式稳定性的综合影响

DOI:
10.1063/1.4939806
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发表时间:
2016-01
期刊:
影响因子:
2.2
通讯作者:
Cui, Shaoyan
Cui, Shaoyan
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wang, Aike;Hao, Guangzhou;Li, Li;Cui, Shaoyan

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导出了托卡马克等离子体中电阻壁模(RWM)稳定性的色散关系,它既包括电阻层阻尼物理,又包括高能离子的环向进动漂移共振阻尼。数值求解模型等离子体的色散关系,在多维等离子体参数空间,包括等离子体的电阻率,电阻壁的径向位置,以及环向流速的RWM稳定性的系统调查的目的。研究发现,电阻层中的环形平均曲率对RWM的稳定性有重要作用。通过增加来自高能离子的漂移动力学贡献,进一步增强了这种稳定性。此外,两个传统假设的内层模型被认为是和比较的色散关系,导致不同的预测RWM的稳定性。
A dispersion relation is derived for the stability of the resistive wall mode (RWM), which includes both the resistive layer damping physics and the toroidal precession drift resonance damping from energetic ions in tokamak plasmas. The dispersion relation is numerically solved for a model plasma, for the purpose of systematic investigation of the RWM stability in multi-dimensional plasma parameter space including the plasma resistivity, the radial location of the resistive wall, as well as the toroidal flow velocity. It is found that the toroidal favorable average curvature in the resistive layer contributes a significant stabilization of the RWM. This stabilization is further enhanced by adding the drift kinetic contribution from energetic ions. Furthermore, two traditionally assumed inner layer models are considered and compared in the dispersion relation, resulting in different predictions for the stability of the RWM.
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