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Characteristics of a new class of transport-related MHD modes in JET H-mode plasmas

机译：JET H型等离子体中新型与运输有关的MHD模式的特征

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摘要

A new type of magnetohydrodynamic (MHD) mode, provisionally termed the wash board (WB) mode, has been observed during II-mode plasmas in JET. It occurs in all types of H-mode discharges, but is not seen during L-mode even at high values of beta. The WB mode appears to be linked with saturation in the plasma confinement and central plasma temperatures. These modes have high m and n numbers and are localized in the outer part of the plasma, typically from the q = 2 surface to the plasma edge. They rotate with the electron diamagnetic frequency and have a strong ballooning character. There is a good correlation between increasing plasma pressure and the growth of both the spectral extent and amplitude of the WB modes. Changes in the electron temperature profile also correlate well with changes in the amplitude of these modes. They are, therefore, regarded as a possible candidate to play a role in the confinement degradation of ii-mode plasmas. Although these modes appear in all types of H-modes in JET, most of the analysis has been carried out during the hot-ion H-mode period of the 100% T discharges, since these modes are practically the only MHD activity left and the small-scale density fluctuations can, therefore, be analysed. [References: 22]
机译：在JET的II模式等离子体期间，已经观察到一种新型的磁流体动力学（MHD）模式，临时称为“洗衣板（WB）模式”。它在所有类型的H模式放电中均会发生，但即使在β值较高时，在L模式下也不会出现。 WB模式似乎与等离子体限制和中央等离子体温度的饱和有关。这些模式具有较高的m和n数，并位于等离子体的外部，通常从q = 2表面到等离子体边缘。它们以电子反磁性频率旋转，并具有很强的膨胀特性。血浆压力的增加与WB模式的光谱范围和幅度的增长之间存在良好的相关性。电子温度曲线的变化也与这些模式的振幅变化很好地相关。因此，它们被认为可能在ii型等离子体的局限降解中发挥作用。尽管这些模式出现在JET的所有类型的H模式中，但大多数分析是在100％T放电的热离子H模式期间进行的，因为这些模式实际上是唯一留下的MHD活性，因此，可以分析小规模的密度波动。 [参考：22]

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