随机磁场对漂移波本征模的影响

本文分析随机磁场对低频漂移波本征模的影响。计算表明,存在随机磁场可影响电子对波的响应,改变电子色散函数,在有理磁面附近(k_‖≈0处),这种变化尤大,随机场可使电子色散函数变得相当平缓,这对漂移波本征模的稳定性有很大影响。本文证明了,在足够强的(但仍是实验允许范围内的)随机磁场下,漂移波普适模可成为绝对不稳定的。

THE EFFECT OF STOCHASTIC MAGNETIC FIELD ON THE EIGEN-MODES OF DRIFT WAVE

In this paper, the effect of stochastic magnetic field (s. m. f.) on the eigen-modes of low frequency drift wave is analysed. We show that the existence of s. m. f. can affect the response of electrons to the wave, so that the electron dispersion function varies. In the vicinity of the rational magnetic surface (where k_‖≈0), the variation is particularly significant. The s. m. f. can make the electron dispersion function considerably smoother, and the change in electron dispersion function may greatly affect the stability of the eigen-modes of drift wave. It is shown that if the s. m. f. is strong enough (but still within the region achievable experimentally), the so-called universal modes of drift wave may become absolutly unstable.