Experimental observation of coupling between turbulence and sheared flows during L-H transitions in a toroidal plasma
Experimental observation of coupling between turbulence and sheared flows during L-H transitions in a toroidal plasma
复制标题
DOI：
10.1209/0295-5075/92/35001
复制
发表时间：
2010-11-01
期刊：
影响因子：
1.8
通讯作者：
Blanco, E.
中科院分区：
文献类型：
--
作者：
Estrada, T.;Happel, T.;Blanco, E.
本文用多普勒反射计对TJ-Ⅱ仿星器从低约束模到高约束模的过渡过程中湍流和等离子体流的动力学进行了实验研究。接近过渡阈值时，实现了逐渐过渡，显示出一个中间的，振荡的瞬态阶段，有利于研究过渡中所涉及的机制。剪切流和湍流水平之间的耦合的测量，揭示了一个特征的捕食者-猎物的行为与L-H转换模型的基础上的连续性驱动的流。版权所有（C）EPLA，2010
The dynamics of turbulence and plasma flows has been studied experimentally by means of Doppler reflectometry during the transition from low to high confinement mode in the stellarator TJ-II. Close to the transition threshold, gradual transitions are achieved showing an intermediate, oscillatory transient phase that facilitates the study of the mechanisms involved in the transition. A coupling between sheared flows and turbulence level is measured which reveals a characteristic predator-prey behavior consistent with the L-H transition models based on turbulence-driven flows. Copyright (C) EPLA, 2010