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Experimental evidence of turbulence regulation by time-varying E × B flows

机译：E×B随时间变化的湍流调节的实验证据

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摘要

The interaction between zonal flows and turbulence is a self-regulating mechanism. Understanding this interaction is crucial to control plasma confinement. Results presented in this paper aim at understanding the conditions under which geodesic acoustic modes (GAMs) influence turbulent transport. This is achieved by performing perturbative experiments where GAMs are stimulated and externally controlled. Experiments on ISTTOK revealed that increasing the GAM shear rate over its natural value leads to a reduction of the turbulent transport and to an enhancement in particle confinement. Taking advantage of our unique experimental tools, it is shown that GAMs play an important role in the regulation of the fluctuations, constituting further evidence that the GAM shear rate is enough to regulate the ambient fluctuations without totally suppressing the turbulence.
机译：纬向流与湍流之间的相互作用是一种自我调节机制。了解这种相互作用对控制血浆限制至关重要。本文提出的结果旨在了解测地声模（GAM）影响湍流传输的条件。这是通过在GAM受刺激和外部控制的情况下进行微扰实验来实现的。 ISTTOK上的实验表明，将GAM剪切速率提高至超过其自然值，会导致湍流传输减少并提高颗粒限制。利用我们独特的实验工具，表明GAM在调节波动中起着重要作用，进一步证明了GAM的剪切速率足以调节环境波动而不会完全抑制湍流。

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  • 来源
    《Nuclear fusion》 |2018年第2期|026017.1-026017.6|共6页
  • 作者

    C. Silva; R. Henriques; C. Hidalgo; H. Fernandes;

  • 作者单位

    Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;

    Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;

    Fusion National Laboratory, CIEMAT, 28040, Madrid, Spain;

    Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;

  • 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

    zonal flows; GAMs; turbulence; confinement;

    机译：地带流量GAM;湍流禁闭;

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