摘要
用积分本征模方程研究了在托卡马克等离子体中包含全部动力学效应的动力剪切阿尔芬波模 (无论是否存在温度梯度 ) .引入了一个新的积分变量 ,将实平面的积分解析延拓到复平面 .这样可以同时研究增长模和阻尼模 .结果表明 ,在有离子温度梯度 (ITG)的情况下 ,激发动力剪切阿尔芬不稳定性所需的等离子体压强梯度比激发理想磁流体动力学气球模不稳定性的阈值低得多 ,没有ITG时两者相同 .与动力无碰撞气球模结果不同 ,当有限ITG存在时 ,剪切阿尔芬模存在第二稳定区 .
Kinetic shear Alfvn modes in tokamak plasmas (with or without temperature gradient) in the full gyrokinetic limit are numerically investigated by using the integral eigenvalue equations. A new integration transformation is introduced in this work. This allows the growing and damping modes to be investigated. It is shown that, in the presence of ion temperature gradient (ITG), the threshold value of plasma pressure gradient for the shear Alfvn modes is well below that for ideal magnetohydrodynamic ballooning instability. It is also demonstrated in a more general sense that, without ITG, the former is identical with the latter. The electromagnetic instability is also found to exist in the second stable region of the ideal modes when a finite ITG is present. The results are compared with previous results of similar analyses for kinetic collisionless ballooning modes.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第4期1641-1647,共7页
Acta Physica Sinica
基金
国家自然科学基金 (批准号 :10 13 5 0 2 0 )资助的课题~~
