Identification of zonal flows in a toroidal plasma
Identification of zonal flows in a toroidal plasma
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DOI：
10.1103/physrevlett.93.165002
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发表时间：
2004-10-15
影响因子：
8.6
通讯作者：
Diamond, PH
中科院分区：
文献类型：
--
作者：
Fujisawa, A;Itoh, K;Diamond, PH
本文利用一种先进的诊断系统--双重离子束探头，从实验上证实了磁约束环形等离子体中存在带状流。在高温(类似于1keV)等离子体中，同时观测两个相距较远的环形位置(类似于1.5m)上的电场，给出了电场(或流动)的涨落谱、纬向流的时空结构(特征径向长度类似于1.5 cm，寿命类似于1.5ms)、它们与环对称的长程关联(n=0)以及有无输运势垒时纬向流振幅的差异。它们构成了湍流-纬向流系统的基本要素，并阐明了自然界中结构形成的基本过程之一。
This Letter presents experimental confirmation of the presence of zonal flows in magnetically confined toroidal plasma using an advanced diagnostic system-dual heavy ion beam probes. The simultaneous observation of an electric field at two distant toroidal locations (similar to1.5 m apart) in the high temperature (similar to1 keV) plasma provides a fluctuation spectrum of electric field (or flow), a spatiotemporal structure of the zonal flows (characteristic radial length of similar to1.5 cm and lifetime of similar to1.5 ms), their long-range correlation with toroidal symmetry (n=0), and the difference in the zonal flow amplitude with and without a transport barrier. These constitute essential elements of turbulence-zonal flow systems, and illustrate one of the fundamental processes of structure formation in nature.