Zonal Flows Driven by Small-Scale Drift-Alfven Modes  

作　　者：李德徽 周登 

机构地区：[1]Institute of Plasma Physics,Chinese Academy of Sciences [2]Center for Magnetic Fusion Theory,Chinese Academy of Sciences

出　　处：《Plasma Science and Technology》2011年第5期523-527,共5页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (No. 10775137);by the Ministry of Science and Technology of China (No. 2009CB105001);partly by the JSPS-CAS Core-University Program in the field of Plasma and Nuclear Fusion

摘　　要：Generation of zonal flows by small-scale drift-Alfven modes is investigated by adopting the approach of parametric instability with the electron polarization drift included. The zonal mode can be excited by primary modes propagating at both electron and ion diamagnetic drift directions in contrast to the assertion in previous studies that only primary modes propagating in the ion diamagnetic drift directions can drive zonal instabilities. Generally, the growth rate of the driven zonal mode is in the same order as that in previous study. However, different from the previous work, the growth rate is no longer proportional to the difference between the diamagnetic drift frequencies of electrons and ions.Generation of zonal flows by small-scale drift-Alfven modes is investigated by adopting the approach of parametric instability with the electron polarization drift included. The zonal mode can be excited by primary modes propagating at both electron and ion diamagnetic drift directions in contrast to the assertion in previous studies that only primary modes propagating in the ion diamagnetic drift directions can drive zonal instabilities. Generally, the growth rate of the driven zonal mode is in the same order as that in previous study. However, different from the previous work, the growth rate is no longer proportional to the difference between the diamagnetic drift frequencies of electrons and ions.

关 键 词：zonal flow parametric instability drift-Alfven mode diamagnetic drift 

分 类 号：O562[理学—原子与分子物理]