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Impact of magnetic islands on turbulent transport in the WEGA stellarator

机译:磁岛对WEGA恒星器中湍流传输的影响

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摘要

The role of the magnetic field topology for the complex interplay between turbulence and zonal flows (ZFs) leading to the formation of transport barriers is a recent topic in fusion research. Gaining knowledge on their relation in experiments requires a flexible magnetic configuration and a good diagnostic access with high temporal and spatial resolution. WEGA as a small classical stellarator with moderate plasma parameters is well suited for such experiments. Stationary n = 1 islands can be modified in size by external error field compensation coils. Configurations with m = 5/1 islands at the plasma edge are compared with configurations showing no major resonances (i.e. no islands). The spatio-temporal structure of fluctuations was studied with Langmuir-probe arrays at different toroidal and poloidal positions. In low density discharges ZF-like patterns were observed in potential fluctuations. A characteristic feature of these oscillations is a long range correlation (LRC) with fluctuations being symmetric on a flux surface. It was shown for the first time that the presence of magnetic islands alters the structure of these low frequency fluctuations. At r
机译:磁场拓扑对湍流和纬向流(ZFs)之间复杂相互作用的作用,导致形成运输壁垒是融合研究中的一个新课题。要获得有关它们在实验中的关系的知识,需要灵活的磁性配置和良好的诊断途径,并具有较高的时空分辨率。 WEGA作为具有中等血浆参数的小型经典恒星发生器非常适合此类实验。固定的n = 1个岛可以通过外部误差场补偿线圈进行修改。将在等离子体边缘处具有m / n = 5/1岛的配置与未显示主要共振的配置(即没有岛)进行比较。使用Langmuir-probe阵列在不同的环形和极向位置研究了时空的涨落结构。在低密度放电中,在电位波动中观察到类似ZF的图案。这些振荡的特征是在磁通表面上对称波动的远距离相关性(LRC)。首次表明,磁岛的存在改变了这些低频波动的结构。在r

著录项

  • 来源
    《Nuclear fusion》 |2012年第5期|p.054014.1-054014.7|共7页
  • 作者

    S. Marsen; M. Otte; R. Wolf;

  • 作者单位

    Max-Planck-Institut fur Plasmaphysik, EURATOM Association, WendelsteinstraBe 1,17491 Greifswald, Germany;

    Max-Planck-Institut fur Plasmaphysik, EURATOM Association, WendelsteinstraBe 1,17491 Greifswald, Germany;

    Max-Planck-Institut fur Plasmaphysik, EURATOM Association, WendelsteinstraBe 1,17491 Greifswald, Germany;

  • 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
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