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On the scaling of avaloids and turbulence with the average density approaching the density limit

机译：在平均密度接近密度极限的情况下，类风化和湍流的定标

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This article is dedicated to the characterization of turbulent transport in the scrape-off layer of the Mega Ampere Spherical Tokamak [A. Sykes , Phys. Plasmas 8, 2101 (2001)] as a function of the average density (n(L)). The aim is to answer a renewed interest in this subject since the bursty character of turbulence in the scrape-off layer was shown to be caused by large-scale events with high radial velocity reaching about 1/10th of the sound speed called avaloids [G. Antar , Phys. Rev. Lett 87, 065001 (2001)]. With increasing density, turbulence and transport increase nonlinearly at the midplane while remaining almost unchanged in the target region. Using various and complementary statistical analyses, the existence of a "critical" density, at n(L)(G)similar or equal to 0.35 is emphasized; n(G) is the Greenwald density. Both above and below this density, intermittency decreases and avaloids play a decreasing role in the particle radial transport. This is interpreted as caused by the interplay between avaloids and the surrounding turbulent structures which mix them more efficiently with increasing density as the level of the background turbulence increases. The scaling of the different quantities with respect to the normalized density is obtained. It reveals that not only the level of turbulence and transport increase, but also the radial velocity and length scales. This increases the coupling between the hot plasma edge and the cold scrape-off layer that may explain the disruptive instability occurring at high densities. (c) 2005 American Institute of Physics.
机译：本文致力于表征兆安培球形托卡马克[A.赛克斯，物理学。 Plasmas 8，2101（2001）]作为平均密度（n（L））的函数。目的是要回应对此主题的新兴趣，因为显示出刮除层中湍流的爆发性特性是由大规模事件引起的，该事件具有高径向速度，达到声速的大约1/10，即所谓的“ Avaloids [G]”。 。安塔尔Rev.Lett 87，065001（2001）]。随着密度的增加，湍流和传输在中平面处非线性增加，而在目标区域中几乎保持不变。使用各种补充统计分析，强调存在“临界”密度（n（L）/ n（G）相似或等于0.35）。 n（G）是格林瓦尔德密度。高于和低于此密度，间歇性都会降低，而类胡萝卜素在粒子径向传输中的作用会降低。这被解释为是由于阿凡特尔与周围湍流结构之间的相互作用所致，随着背景湍流水平的提高，它们与密度增加而更有效地混合在一起。获得相对于归一化密度的不同量的缩放比例。它表明，不仅湍流和输运水平增加，而且径向速度和长度尺度也增加。这增加了热等离子体边缘和冷刮除层之间的耦合，这可以解释高密度下发生的破坏性不稳定性。 （c）2005年美国物理研究所。

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