Origin and turbulence spreading of plasma blobs
Origin and turbulence spreading of plasma blobs
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DOI：
10.1063/1.4908272
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发表时间：
2015-02
影响因子：
2.2
通讯作者：
P. Manz;T. Ribeiro;B. Scott;G. Birkenmeier;D. Carralero;G. Fuchert;S. Müller;H. W. Müller;U. Stroth;E. Wolfrum
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文献类型：
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作者：
P. Manz;T. Ribeiro;B. Scott;G. Birkenmeier;D. Carralero;G. Fuchert;S. Müller;H. W. Müller;U. Stroth;E. Wolfrum
在分离矩阵附近的回旋流体模拟中，通过分析等离子体斑点的轨迹来研究它们的形成。大多数斑点出现在分离矩阵外的最大径向电场处。一般来说，斑点的产生并不局限于一个特定的径向位置或不稳定性。推导了刮擦层湍流扩散的简单模型。仿真结果表明，湍流扩散是远刮脱层湍流的重要能量驱动，是研究远刮脱层湍流产生的一个更合适的量。
The formation of plasma blobs is studied by analyzing their trajectories in a gyrofluid simulation in the vicinity of the separatrix. Most blobs arise at the maximum radial electric field outside the separatrix. In general, blob generation is not bound to one particular radial position or instability. A simple model of turbulence spreading for the scrape-off layer is derived. The simulations show that the blob dynamics can be represented by turbulence spreading, which constitutes a substantial energy drive for far scrape-off layer turbulence and is a more suitable quantity to study blob generation compared to the skewness.