Abstract

Here we report the results of the turbulence study in the high-confinement mode (H-mode) with and without edge localized modes (ELMs). The study was performed by the Doppler backscattering (DBS) method on the Globus-M tokamak. Two types of ELMs were observed in the Globus-M tokamak during NBI heating and accordingly, two different transitions to transient ELM-free modes were discovered. It was demonstrated that the transition from the H-mode with ELMs accompanied by small sawtooth oscillations to the ELM-free H-mode is characterized by the drop of the turbulence amplitude near the periphery while the transition in the case of ELMs is accompanied by large sawtooth oscillations, which occur without suppression of peripheral turbulence.

中文翻译：

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向无ELM H模式过渡期间Globus-M托卡马克等离子体中的湍流研究

摘要

在这里，我们报告了在高约束模式（H模式）下和不存在边缘局部模式（ELM）的情况下湍流研究的结果。该研究是通过Globus-M托卡马克上的多普勒背散射（DBS）方法进行的。在NBI加热期间，在Globus-M托卡马克中观察到两种类型的ELM，因此，发现了向瞬态无ELM模式的两种不同过渡。结果表明，从ELM伴随着小的锯齿波振荡的H模式到无ELM的H模式的转变的特征在于，在周边附近湍流幅度下降，而在ELM的情况下伴随着大的湍流振幅下降。锯齿状振荡，在不抑制外围湍流的情况下发生。