Plasma filaments have been observed by reciprocating electric probes in the Scrape-Off Layer (SOL) of the Wendelstein 7-X stellarator. Comparison with target probes indicates that a filament observed in the W7-X SOL extends to the sheath. Two-dimensional simulations of seeded filaments exhibit good quantitative agreement with experimental measurements in filament velocity scalings, despite an assumption of constant field line curvature. Both experiment and simulation show a slow radial propagation of filaments, indicating that filaments are essentially bound to their flux surface and do not perform ballistic radial motion. In contrast, the poloidal propagation along flux surfaces is much faster than the radial motion.

中文翻译：

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Wendelstein 7-X 刮削层中的等离子细丝

已通过在 Wendelstein 7-X 仿星器的刮削层 (SOL) 中的往复电探针观察到等离子体细丝。与目标探针的比较表明，在 W7-X SOL 中观察到的细丝延伸到护套。尽管假设场线曲率恒定，但种子细丝的二维模拟与细丝速度标度的实验测量显示出良好的定量一致性。实验和模拟均显示细丝的缓慢径向传播，表明细丝基本上与其通量表面结合并且不进行弹道径向运动。相比之下，沿通量表面的极向传播比径向运动快得多。