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Synergistic effects of turbulence induced viscosity and plasma flow on resistive wall mode instability
Plasma Physics and Controlled Fusion ( IF 2.2 ) Pub Date : 2020-04-28 , DOI: 10.1088/1361-6587/ab8e18
G Z Hao 1 , Y Q Liu 2 , A K Wang 1 , H T Chen 1 , Y T Miao 3 , S Wang 1 , N Zhang 1 , G Q Dong 1 , M Xu 1
Affiliation  

A new damping model on the resistive wall mode (RWM) instability is studied, via the turbulence induced plasma viscosity (in short, turbulent viscosity). \bl{In a cylindrical plasma}, the synergistic effect on suppressing the RWM is investigated between this new damping mechanism and the plasma flow. An eigenmode formulation is derived based on magneto-hydrodynamic (MHD) theory, where the momentum equation is extended by including the turbulent viscosity term with a proportionality coefficient $\chi$. Numerical results show that, in the absence of plasma flow, increasing $\chi$ decreases the RWM growth rate but does not fully stabilize the mode. However, in the presence of sufficiently fast plasma flow, turbulent viscosity can lead to full suppression of the RWM, when $\chi$ exceeds a critical value. Similarly, at a given $\chi$ value, the plasma flow can fully suppress the mode when the flow velocity exceeds a threshold value. In particular, turbulent viscosity significantly reduces the threshold value of the flow velocity required for full stabilization of the RWM.

中文翻译:

湍流诱导粘度和等离子体流对电阻壁模式不稳定性的协同作用

通过湍流引起的等离子体粘度(简称为湍流粘度),研究了关于阻力壁模式 (RWM) 不稳定性的新阻尼模型。\bl{在圆柱形等离子体中},研究了这种新的阻尼机制和等离子体流之间对抑制 RWM 的协同作用。基于磁流体动力学 (MHD) 理论推导出本征模式公式,其中通过包含具有比例系数 $\chi$ 的湍流粘度项来扩展动量方程。数值结果表明,在没有等离子体流的情况下,增加 $\chi$ 会降低 RWM 的增长率,但不能完全稳定模式。然而,当存在足够快的等离子体流时,湍流粘度会导致 RWM 的完全抑制,当 $\chi$ 超过临界值时。类似地,在给定的 $\chi$ 值下,当流速超过阈值时,等离子体流可以完全抑制模态。特别是,湍流粘度显着降低了 RWM 完全稳定所需的流速阈值。
更新日期:2020-04-28
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