逃逸电子不稳定性

本文分析了逃逸电子的加速运动对微观不稳定性的影响,并指出,加速效应改变了波与粒子之间的动力学耦合关系,不稳定机制不能再归结为简单的共振粒子与波的耦合效应。本文在动力学方程和特征线方程中同时引入零级电场,以这种自洽的方式讨论不稳定性问题,并与不考虑加速效应的情形作了比较。结果表明,当共振速度远离逃逸区的边界时,加速效应不导致增长率的显著改变,但当共振速度落在逃逸区的边界附近时,加速效应可能对增长率发生重要影响。关键词：

INSTABILITIES DUE TO RUNAWAY ELECTRONS

In this paper, the effect of acceleration of runaway electrons on the microscopic instabilities is discussed. The result shows that the mechanism of instabilities is no longer a simple wave-particle resonant effect. When the resonant velocity is far away from the boundaries of the velocity region of runaway electrons, the growth rate is not considerably different from that in the no acceleration case. However, if it is close to the boundaries, the effect of acceleration on the growth rate will be important.