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首页> 外文期刊>Plasma physics and controlled fusion >Transport and evolution of ion gyro-scale plasma blobs in perpendicular magnetic fields
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Transport and evolution of ion gyro-scale plasma blobs in perpendicular magnetic fields

机译：垂直磁场中离子陀螺尺度等离子体团的传输和演化

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摘要

Strongly localized concentrations or depressions of plasma density and magnetic field strength (blobs) are ubiquitous in the edge region of tokamak fusion experiments. The existing fusion plasma literature in this area focuses primarily on blobs sufficiently large that a fluid description is appropriate. However, the blob population may include some - not necessarily easily detectable - whose characteristic lengthscales are on the order of the ion gyro-scales. This implies that a description at the fluid level is unlikely to capture the full dynamics. Here, therefore, we report hybrid (particle ions, fluid electrons) simulations of ion gyro-scale blobs, which enable us to examine the effects of finite Larmor radius on their dynamics and evolution. We find that ion gyro-scale blobs are advected with the background flow, and develop a twin-celled vortex structure. Asymmetry then arises from finite ion Larmor radius kinetics, manifesting in the size of the internal vortices, the shape of tails forming from blob ejecta, and the growth of a KelvinHelmholtz instability.
机译：在托卡马克融合实验的边缘区域中，血浆浓度和磁场强度（斑点）的强烈局部集中或下降是普遍存在的。该领域中现有的融合等离子体文献主要集中于足够大的斑点，以至于流体描述是适当的。但是，斑点种群可能包括一些-不一定容易检测到-其特征长度尺度为离子陀螺尺度的数量级。这意味着在流体水平上的描述不可能捕获全部动态。因此，在这里，我们报告了离子陀螺刻度斑点的混合（粒子离子，流体电子）模拟，这使我们能够检查有限的拉莫半径对其动力学和演化的影响。我们发现离子陀螺规模的斑点平移与背景流，并发展出双细胞涡旋结构。然后，不对称性由有限离子拉莫尔半径动力学引起，表现为内部漩涡的大小，由斑点喷射形成的尾部形状以及KelvinHelmholtz不稳定性的增长。

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