线性磁化等离子体装置中平均流、带状流与湍流的相互作用

项目名称： 线性磁化等离子体装置中平均流、带状流与湍流的相互作用

项目编号： No.11275200

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 谢锦林

作者单位： 中国科学技术大学

项目金额： 80万元

中文摘要： 等离子体湍流及其引起的反常输运一直是等离子体物理学界的重要难题之一。近二十年来，人们幸运地发现湍流本身提供了可能的自调节机制，如湍流雷诺协强驱动的极向流、调制不稳定性产生的带状流等，这些机制为等离子体约束性能的进一步改善提供了可能的手段。极向流、带状流均可从湍流背景中提取能量，而且极向流剪切及带状流对湍流的剪切可以抑制湍流所驱动的输运。平均极向流-带状流-湍流共同组成一个自调节的非线性动力学系统，它们之间的相互耦合决定了湍流的饱和幅度和输运水平。因此对这一系统自调节行为的理论、模拟和实验研究已成为磁约束等离子体研究中的重要的前沿课题。本项目的研究目标是给出在线性磁化等离子体中存在低频带状流以及湍流驱动的极向流共存的实验证据，探索平均流-带状流-湍流的自调节动力学行为，并研究这些流的产生和饱和机制。

中文关键词： 等离子体湍流；带状流；平均流；剪切流；粒子输运

英文摘要： The plasma turbulence and its related anomalous transport have attracted much attention for many years. Recently researchers are glad to find that there have some self-regulated mechanisms in plasma turbulence, for instance, the Reynolds Stress driven shear flow and the ZF-DW system.Generated by the nonlinear energy transfer from drift wave turbulence (DW), ZFs in magnetically confined plasmas contribute no cross field transport due to their azimuthal symmetry. Therefore the formation of ZFs will naturally reduce the level of trans- port caused by DW. The transport is further suppressed by the shearing effect of ZF on DW, as the back reaction of ZF to DW. Thus ZFs and DW constitute a self regulated energy conservation system, which is commonly referred to as DW-ZF turbulence. The related research about the ZF-DW system will provide possible future method to improve the plasma confinement in the coming ITER era. In this project, we will seek in linear plasma device for the possible experimental evidence of the co-existence of Zonal flow and shear flow, both driven by the ambient plasma turbulence. Also we will investigate the generation and saturation mechanisms for these flows, so that we know better about the self-modulated dynamics of the complex plasma system with mean flow, zonal flow and turbulence.

英文关键词： ambient turbulence；zonal flow；mean flow；shear flow；plasma particle transport