Blob/hole formation and zonal-flow generation in the edge plasma of the JET tokamak

Blob/hole formation and zonal-flow generation in the edge plasma of the JET tokamak
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JET 托卡马克边缘等离子体中的斑点/孔洞形成和层流生成

DOI:
10.1088/0029-5515/49/9/092002
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发表时间:
2009-09
期刊:
影响因子:
3.3
通讯作者:
Carlos Hidalgo
Carlos Hidalgo
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Mike Stamp;Bruno Soares Goncalves;Carlos Silva;Volker Naulin;Jens Juul Rasmussen;Anders H. Nielsen;Wojtek Fundamenski;徐国盛;Sergei I. Krasheninnikov;J. Arturo Alonso;万宝年;Carlos Hidalgo

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在JET托卡马克的边缘等离子体中获得了第一个实验证据,显示了斑点/孔形成和带状流产生之间的联系。洞以及斑点被观察到出生在边缘剪切层,在那里的带状流剪切中尺度相干结构,导致断开的正,负压力扰动。新形成的斑点运输方位角动量的方位角流的梯度和驱动的带状流剪切,同时向外移动。在这个过程中,能量通过湍流雷诺应力从中尺度拟序结构转移到带状流,导致边缘湍流的非线性饱和和中尺度波动的抑制。这些发现对磁约束等离子体湍流中结构形成的机制具有重要意义。
The first experimental evidence showing the connection between blob/hole formation and zonal-flow generation was obtained in the edge plasma of the JET tokamak. Holes as well as blobs are observed to be born in the edge shear layer, where zonal-flows shear off meso-scale coherent structures, leading to disconnection of positive and negative pressure perturbations. The newly formed blobs transport azimuthal momentum up the gradient of the azimuthal flow and drive the zonal-flow shear while moving outwards. During this process energy is transferred from the meso-scale coherent structures to the zonal flows via the turbulent Reynolds stress, resulting in nonlinear saturation of edge turbulence and suppression of meso-scale fluctuations. These findings carry significant implications for the mechanism of structure formation in magnetically confined plasma turbulence.
DOI: 10.1017/s0022377807006940
发表时间: 2008-10
影响因子: 2.5
作者:
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