利用粒子运动讨论等离子体电流片

本文我们利用了带电粒子在中性片磁场中的运动规律,讨论了一维等离子体电流片。我们引用了与阿尔芬的引导中心理论相类似的方法,将粒子在非小扰动区(在这个区内磁场很小或等于零)内的"8"字形运动分解成两个圆周运动。每一个圆周运动等效于一个小磁铁,因此"8"字形运动等效于两个极性相反的小磁铁。等离子体中的电流是根据j=en+c(这里有图片19820103-21-1.GIF)×M计算出来的,其中等离子体的分布函数是由粒子的运动常数给出的。计算结果表明电流片主要是由粒子在非小扰动区中的"反向漂移"产生的。与此同时我们还讨论了粒子运动与磁场之间的关系,并计算了其自洽场。

PLASMA CURRENT SHEET STUDIED BY MEANS OF PARTICLE MOTION

In this paper,we studied a one-dimensional plasma current sheet by means of the regular pattern of motion of charged particles moving in a neutral sheettmagnetic field.Aguiding centre theorem similar to that of Alfven's was used,the "8" shaped motion in non-perturbation region (where the magnetic field is small or equal to zero) is divided into two "circular" motions.Bach circular motion is equivalent to a magnet.So the "8" shaped motion is equivalent to two magnets in opposite directions.The electric current of plasma is derived from j=en+c(这里有图片19820103-21-1.GIF)×M where the distribution function of plasma is a function of constant motion.We found that the current sheet is mainly due to the "inverse drift" motion in the non-perturbation region.We have also studied the relation between charged particle motions and the magnetic field,and derived a self-consistent magnetic field.