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Experimental investigation of the parallel structure of fluctuations in the scrape-off layer of Alcator C-Mod

机译:Alcator C-Mod刮除层中波动的并行结构的实验研究

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摘要

The parallel structure of blob filaments in the scrape-off layer of Alcator C-Mod is investigated by combining electrostatic probe measurements with localized measurements of D_a or He i line emission. The spatially resolved emission measurements were made in the outboard midplane region, while probes sampled fluctuations both close to the magnetic X-point and at the outer divertor target. Time-delay correlation analysis reveals that blobs form highly elongated filaments along the ambient magnetic field from the midplane to the divertor target. Those filaments appear to be fairly unaffected by the strong magnetic shear region close to the X-point with maximum correlation amplitudes of approximately 75% between near-midplane and near-X-point fluctuations, as well as between near-midplane and divertor-target fluctuations. However, the filaments do not form at the same time everywhere within a flux tube, but appear, on average, first nearer the midplane and show diffusion along the magnetic field. This parallel propagation occurs on a time-scale that is much faster than expected from particle diffusion, but agrees with fundamental dispersion estimates.
机译:通过将静电探针测量值与D_a或He i线发射的局部测量值相结合,研究了Alcator C-Mod刮除层中的斑点细丝的平行结构。在外侧中平面区域进行了空间分辨的发射测量,同时对靠近磁X点和外部偏滤器目标的波动进行了采样采样。时滞相关分析表明,斑点沿着从中平面到偏滤器目标的环境磁场形成高度细长的细丝。这些细丝似乎不受X点附近的强磁剪切区域的影响,在近中平面和近X点波动之间以及近中平面和偏斜目标之间的最大相关幅度约为75%。波动。但是,灯丝不会在通量管内的任何地方同时形成,而是平均出现在首先靠近中平面的位置,并沿磁场扩散。这种并行传播发生的时间尺度比粒子扩散所期望的要快得多,但与基本色散估计相符。

著录项

  • 来源
    《Nuclear fusion》 |2014年第4期|043012.1-043012.12|共12页
  • 作者单位

    Max-Planck-Institute for Plasma Physics, Greifswald Branch, Greifswald, Germany;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, USA;

    Center for Momentum Transport and How Organization, University of California, San Diego, La Jolla, USA;

    Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA, USA;

    Department of Physics and Technology, University of Tromso, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    drift waves; turbulence; magnetic confinement fusion; plasma diagnostics; plasma instabilities; plasma physics; plasma waves;

    机译:漂波湍流磁约束聚变血浆诊断;等离子体不稳定性等离子体物理学等离子波;

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