The dynamics of turbulent filaments in L and ELM-free H-mode in the RFX-mod device operating as a tokamak is discussed in the present work. L-H transition and sustained H-mode have been achieved in the RFX-mod with the aid of an external electrode biasing (Spolaore et al 2017 Nucl. Fusion 57 116039). Through advanced statistical techniques, turbulent filaments are detected and tracked from the edge to the scrape-off layer (SOL) in a two-dimension floating potential map (measured with a 2D array of Langmuir probes) related with extreme events of a fixed ion saturation current signal in the SOL. While in L-mode filaments travel almost freely, their motion becomes restricted to the near SOL during the induced biasing H-mode. In this region, the background shear decorrelation time becomes shorter than the convective filament time, favouring its suppression. However, the experimental observation of a nearly ‘trapped’ monopole potential points out the possible role of th...

中文翻译：

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在作为托卡马克的RFX-mod中，L和H模式下的湍流灯丝特性

在本工作中讨论了在作为托卡马克运行的RFX-mod设备中，L和无ELM H模式下的湍流灯丝动力学。借助外部电极偏置，已在RFX-mod中实现了LH过渡和持续的H模式（Spolaore等人2017 Nucl.Fusion 57 116039）。通过先进的统计技术，在二维浮动电势图（使用Langmuir探头的二维阵列测量）中，检测并跟踪了从边缘到刮擦层（SOL）的湍流灯丝，这些图与固定离子饱和度的极端事件相关SOL中的当前信号。在L模式下，灯丝几乎自由行进，但在感应偏向H模式期间，它们的运动被限制在接近SOL的位置。在这个区域，背景剪切解相关时间变得比对流灯丝时间短，赞成压制。然而，对几乎“被困”的单极电势的实验观察指出，单极电势的可能作用是...