Decay of poloidal rotation in a tokamak plasma
Decay of poloidal rotation in a tokamak plasma
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DOI：
10.1063/1.1694506
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发表时间：
1973-08
影响因子：
4.6
通讯作者：
T. H. Stix
中科院分区：
文献类型：
--
作者：
T. H. Stix
径向电场可以通过几种机制在托卡马克中建立，例如非双极粒子输运或损失，或者由于注入快中性原子而发生的电荷的不均匀沉积。径向场的初始效应是产生等离子体的极向旋转。然而，这种旋转使等离子体的运动元素受到磁泵的能量耗散，这在离子-离子碰撞时间的数量级的周期内阻尼旋转。通过将漂移动力学方程和简单的弛豫碰撞项应用于平板模型低β等离子体，分析了“平台”和“香蕉”区域的问题。该计算可以更普遍地应用于周期或随机磁场中任何低β长平均自由程等离子体的动量耗散问题。
Radial electric fields may be built up in a tokamak by several mechanisms such as nonambipolar particle transport or loss, or the inhomogeneous deposition of electric charge which occurs as a result of the injection of fast neutral atoms. The initial effect of the radial fields is to produce a poloidal rotation of the plasma. Such rotation, however, subjects the moving elements of the plasma to energy dissipation by magnetic pumping, which damps the rotation in a period of the order of the ion‐ion collision time. The problem is analyzed for the “plateau” and “banana” regimes by applying the drift kinetic equation, with a simple relaxation collision term, to a slab‐model low‐β plasma. The calculation may be more generally applied to the problem of momentum dissipation for any low‐β long‐mean‐free‐path plasma in a periodic or stochastic magnetic field.