Modification of favorable average curvature effect by changing parallel sound wave behavior in tokamak plasmas
Modification of favorable average curvature effect by changing parallel sound wave behavior in tokamak plasmas
复制标题
通过改变托卡马克等离子体中的平行声波行为来修改有利的平均曲率效应
DOI：
10.1088/1741-4326/abf2e3
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发表时间：
2021-03
期刊：
影响因子：
3.3
通讯作者：
Guangzhou Hao
中科院分区：
文献类型：
--
作者：
Xue Bai;Yueqiang Liu;Guangzhou Hao
有利的平均曲率效应，也称为GGJ效应（Glasser等1975 Phys.Fluids 18 875），本质上与托卡马克等离子体中的平行声波传播有关。这项工作研究如何GGJ效果修改通过改变平行声波的行为。采用两个超越标准单流体理论的物理模型，即各向异性热输运模型和平行声波阻尼模型，改变环形等离子体中的平行声波，并针对两类重要问题，即电阻等离子体对外加共振磁扰动的响应和撕裂模的稳定性，证明了GGJ效应的结果.环形建模揭示了GGJ效应被上述两种物理效应显著改变。与完全消除GGJ效应的热传输物理学相比，声波阻尼效应仅提供部分缓解。从屏蔽电流的径向结构和撕裂不稳定性的本征函数两个方面进一步说明了这两种模型之间的差异。特别是，热传输完全抑制GGJ效应的根本原因被确定为极向谐波的额外环形耦合。
The favorable average curvature effect, also known as the GGJ effect (Glasser et al 1975 Phys. Fluids 18 875), is intrinsically associated with parallel sound wave propagation in a tokamak plasma. This work investigates how the GGJ effect is modified by changing the parallel sound wave behavior. Two physics models beyond the standard single fluid theory, i.e. an anisotropic thermal transport model and a parallel sound wave damping model, are employed to change parallel sound waves in a toroidal plasma, and the consequence on the GGJ effect is demonstrated for two important classes of problems, i.e. the resistive plasma response to the applied resonant magnetic perturbation and the stability of the tearing mode. Toroidal modeling reveals that the GGJ effect is significantly altered by both of the aforementioned physics effects. Compared to the thermal transport physics, which completely removes the GGJ effect, the sound wave damping effect only offers partial mitigation. The differences between these two models are further illustrated in terms of the radial structure of the shielding current and the eigenfunction of the tearing instability. In particular, a fundamental reason for complete suppression of the GGJ effect by the thermal transport is identified as an extra toroidal coupling of the poloidal harmonics.
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