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Unstable ion-temperature-gradient modes in an advanced tokamak plasma

机译：先进的托卡马克等离子体中不稳定的离子温度梯度模式

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摘要

The linear stability of the ion-temperature-gradient (ITG) driven drift modes is investigated in an International Thermonuclear Experimental Reactor-like geometry using an advanced reactive fluid model and the ballooning mode formalism. The spectrum of stable and unstable modes and their real frequencies, growth rates and eigenfunctions are calculated for two specific magnetic flux surfaces. The effects of density and temperature gradients, temperature ratios, wave vector and geometrical quantities such as local magnetic shear (LMS), normal curvature, geodesic curvature and magnetic field on the ITG mode are discussed. It is found that the most unstable eigenfunction is extended and less unstable at the magnetic surface where global magnetic shear is reversed. Moreover, the role of positive LMS is found to be destabilizing at the reverse shear magnetic surface. However, at a positive global shear magnetic surface, the eigenmode is found to be more localized and more unstable, and its structure and stability are affected by the local behaviour of the geometrical quantities.
机译：离子温度梯度（ITG）驱动的漂移模式的线性稳定性在国际热核实验反应堆样几何结构中使用先进的反应流体模型和膨胀模式形式进行了研究。对于两个特定的磁通量表面，计算了稳定模式和不稳定模式的频谱及其实际频率，增长率和本征函数。讨论了密度和温度梯度，温度比，波矢和几何量（例如局部磁剪切（LMS），法向曲率，测地曲率和磁场）对ITG模式的影响。发现最不稳定的本征函数在整体磁剪切反转的磁性表面上扩展而不稳定。此外，发现正LMS的作用在反向剪切磁性表面上不稳定。但是，在正的全局剪切磁表面上，本征模被发现更局限且更不稳定，并且其结构和稳定性受几何量的局部行为影响。

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