反剪切等离子体中的湍流输运TURBULENTTRANSPORTIN.PDFVIP

CNIC-01537 SIP-0132 反剪切等离子体中的湍流输运 TURBULENT TRANSPORT IN REVERSED MAGNETIC SHEAR PLASMA 中 国 核 情 报 中 心 China Nuclear Information Centre CNIC-01537 SIP-0132 反剪切等离子体中的湍流输运 王爱科 邱孝明 （核工业西南物理研究院，成都，610041 ） 摘 要 研究了反剪切等离子体中的粒子和离子热湍流输运。采用两流 体理论和剪切坐标系统，导出了温度梯度、磁场梯度、捕获电子驱 动的漂移波的色散关系。在准线性近似下，还导出了粒子和离子热 的湍流扩散率。给出的模型自恰地包含了五个因子：磁剪切和剪切 速度以及它们耦合的三种方式。这五个因子，不仅存在于色散关系 也存在于湍流输运系数中，在负磁剪切区域产生湍流粒子和离子热 箍缩效应。结果，总的粒子和离子热扩散率在负磁剪切区域显著减 速少。得出的粒子和离子热扩散率的数值结果与实验结果趋势一致 1 Turbulent Transport in Reversed Magnetic Shear Plasma WANG Aike QIU Xiaoming (Southwestern Institute of Physics, Chengdu, 610041) ABSTRACT The turbulent transport of particles and ion heat in reversed magnetic shear plasma are investigated. A dispersion relation for the electrostatic drift wave driven by ion temperature gradient, electron temperature gradient, magnetic field gradient, and trapped electrons is derived within the framework of two-fluid theory and in sheared coordinate system. Correspondingly the turbulent particle and ion thermal diffusivities in quasi-linear approximation are obtained. The present model self- consistently includes five factors: the magnetic shear and the sheared velocity, and the three ways of coupling between them. It is found that the five factors presented in the turbulent transport coefficients as well as the dispersion relation can produce turbulent particle- and heat-pinch, i.e., turbulent diffusivity of particles and that of ion heat in the negative magnetic shear region are