Nonlinear evolution of resistive wall mode in a cylindrical tokamak with poloidal rotation
Nonlinear evolution of resistive wall mode in a cylindrical tokamak with poloidal rotation
复制标题
DOI：
10.1063/1.2358965
复制
发表时间：
2006-10
影响因子：
2.2
通讯作者：
M. Sato;N. Nakajima
中科院分区：
文献类型：
--
作者：
M. Sato;N. Nakajima
在低β圆柱托卡马克装置中，利用约化磁流体动力学方程组，对具有多普勒频移优势的平衡极向旋转的电阻壁模（RWM）进行了非线性模拟。当平衡极向旋转频率较小时，多普勒频移占主导地位时，壁模变得不稳定，这是几乎锁定在电阻壁上的RWM之一。由于慢化力矩随着平衡极向旋转频率的增加而增加，并且在饱和之前，极向旋转在等离子体表面附近减小到几乎为零，因此非线性饱和水平不依赖于平衡极向旋转频率或冷等离子体的密度。当平衡极向旋转频率大于某一临界值时，旋转到电阻壁的等离子体模变得不稳定。当冷等离子体密度与堆芯等离子体密度相同时，
Nonlinear simulations of resistive wall modes (RWMs) with a Doppler shift dominant equilibrium poloidal rotation have been carried out by using reduced magnetohydrodynamic equations in a low beta cylindrical tokamak, where the core plasma is surrounded by a cold plasma with a high resistivity. When the equilibrium poloidal rotation frequency is small and the Doppler shift is predominant, the wall mode becomes unstable, which is one of the RWMs nearly locked to the resistive wall. Since the slowing down torque increases with equilibrium poloidal rotation frequency and the poloidal rotation decreases to almost zero near the plasma surface before the saturation, the nonlinear saturation level does not depend on either the equilibrium poloidal rotation frequency or the density of the cold plasma. When the equilibrium poloidal rotation frequency becomes larger than a critical value, the plasma mode rotating to the resistive wall becomes unstable. When the cold plasma has the same density as that in the core pl...