In this article, we report the latest results for the impacts of the isotope mass and the plasma heating scenario on the spatiotemporal characteristics of the low-frequency zonal flow (ZF)-like electrostatic oscillation found in the plasma edge of the TJ-II stellarator. The radial profile of the toroidal cross-coherence in low-frequency floating potential fluctuations (1 < f < 25 kHz), known as long-range correlations (LRCs), was explored along the plasma boundary region by a dual Langmuir probe system. The study was performed using electron cyclotron resonance heating (ECRH)- and neutral beam injection (NBI)-heated plasmas with two different isotope concentrations: pure hydrogen plasmas and plasmas dominated by deuterium (). The highest toroidal coherence levels are detected for floating potential oscillations at less than 10 kHz in hydrogen and deuterium plasmas, in both the ECRH and NBI heating schemes. The radial extent of the LRC profile is clearly larger in the ECRH than in the NBI-heated plasma scenarios. While the maximum amplitude of the LRC does not show a significant dependence on isotope mass, the relation between the LRCs’ radial sizes in plasmas and different isotope masses increases with the isotope mass in NBI-heated scenarios. These results provide the first experimental observation of ZFs with a larger radial size in deuterium than in hydrogen plasmas.

在本文中，我们报告了有关同位素质量和等离子体加热情景对在TJ-II恒星发生器的等离子体边缘发现的低频纬向流（ZF）状静电振荡的时空特征的影响的最新结果。 。通过双Langmuir探针系统沿等离子体边界区域探索了低频浮动电势波动（1 < f <25 kHz）中的环形交叉相干的径向轮廓，称为长程相关性（LRC）。这项研究是使用电子回旋共振加热（ECRH）和中性束注入（NBI）加热的具有两种不同同位素浓度的等离子体进行的：纯氢等离子体和氘为主的等离子体（）。在ECRH和NBI加热方案中，对于氢和氘等离子体中小于10 kHz的浮动电势振荡，检测到最高的环形相干性。在ECRH中，LRC轮廓的径向范围明显大于在NBI加热的等离子体方案中。虽然LRC的最大振幅对同位素质量没有显着影响，但在NBI加热的情况下，等离子体中LRC的径向尺寸与不同同位素质量之间的关系会随着同位素质量的增加而增加。这些结果首次提供了氘在氢中比氢等离子体中的径向尺寸更大的ZF的实验观察结果。