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The effect of pressure anisotropy on ballooning modes in tokamak plasmas

机译：压力各向异性对托卡马克等离子体膨胀模式的影响

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摘要

Edge Localised Modes are thought to be caused by a spectrum of magnetohydrodynamic instabilities, including the ballooning mode. While ballooning modes have been studied extensively both theoretically and experimentally, the focus of the vast majority of this research has been on isotropic plasmas. The prevalence of pressure anisotropy in modern tokamaks thus motivates further study of these modes. This paper presents a numerical analysis of ballooning modes in anisotropic equilibria. The investigation was conducted using the newly-developed codes HELENA+ATF and MISHKA-A, which adds anisotropic physics to equilibria and stability analysis. We have examined the impact of anisotropy on the stability of an n = 30 ballooning mode, confirming results conform to previous calculations in the isotropic limit. Growth rates of ballooning modes in equilibria with different levels of anisotropy were then calculated using the stability code MISHKA-A. The key finding was that the level of anisotropy had a significant impact on ballooning mode growth rates. For T-perpendicular to T-parallel to, typical of ICRH heating, the growth rate increases, while for T-perpendicular to T-parallel to, typical of neutral beam heating, the growth rate decreases.
机译：认为边缘局部模式是由磁性流动动力学稳定性的频谱引起的，包括膨胀模式。虽然在理论上和实验上广泛地研究了气球模式，但绝大多数这项研究的重点是各向同性的等离子体。因此，现代Tokamaks中压力各向异性的患病率促进了对这些模式的进一步研究。本文介绍了各向异性均衡中的膨胀模式的数值分析。使用新开发的Codes Helena + ATF和Mishka-A进行了调查，这增加了各向异性物理学来平衡和稳定性分析。我们已经研究了各向异性对n = 30膨胀模式的稳定性的影响，确认结果符合先前在各向同性极限中的计算。然后使用稳定码Mishka-a计算具有不同各向异性水平的平衡率的膨胀模式的生长速率。关键发现是各向异性水平对膨胀模式增长率产生重大影响。对于T型垂直于＆ T平行于ICRH加热的典型，生长速率增加，而对于T型垂直于＆ T平行于中性光束加热典型，生长速率降低。

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