粘滞性产生的极化电流对微岛的作用  

Role of viscosity induced polarization current in micro-island evolution

作　　者：曹锦佳[1] 王爱科[1] 孙爱萍[1] 

机构地区：[1]核工业西南物理研究院,成都610041

出　　处：《核聚变与等离子体物理》2010年第1期17-20,共4页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金资助课题(10775040;10875037)

摘　　要：导出了微岛(w/ρi→0)的垂直粘滞性,运用该粘滞性获得了微岛的静电势函数和岛宽随时间演化的动力学方程。理论分析表明,该粘滞性引起的极化电流对微岛起不稳定作用。进一步的数值分析显示当离子温度较小或离子温度突然下降时,极化电流使微岛快速增长,与实验观测到的结果定性一致。The perpendicular viscosity for the micro-island （w/ρ→0 ） has been derived. Based on the viscosity, the electrostatic potential function and the dynamic equation of magnetic island evolution have been obtained. The dynamic equation indicates that the viscosity-induced polarization current plays an unstable role in micro-island evolution. Furthermore, numerical analyses show that when ion temperature is small or decreases suddenly, the polarization current makes micro-islands grow rapidly, which are roughly in agreement with the exoerimental observation.

关 键 词：粘滞性 微岛 静电势函数 极化电流 离子温度 

分 类 号：O534[理学—等离子体物理]