HT-7托卡马克欧姆放电条件下逃逸电子不稳定性的实验研究  

Study of runaway instability in ohimc discharges on the HT-7 tokamak

作　　者：王少锋[1] HT-7核测量组 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031

出　　处：《核技术》2009年第8期588-591,共4页Nuclear Techniques

摘　　要：HT-7托卡马克等离子体在低密度逃逸放电条件下,等离子体电流负反馈控制和水平位移振荡成功实现了逃逸电子的反常多普勒共振,分析了共振效应的实现条件。结果显示:反常多普勒共振使逃逸电子的垂直能量增加,平行能量减小,螺旋角增大,从而逃逸电子的同步辐射功率增加,最终逃逸电子的能量降低。可通过此法抑制逃逸电子能量,从而减小逃逸电子对装置造成的损害。In tokamak plasmas, under the influence of longitudinal electric field the initial Maxwellian electron distribution function begins to grow a runaway tail. Above a certain threshold, instabilities can be excited. In this paper, we present the study of anomalous Doppler instability of runaway electrons in ohmic discharges on the HT-7 tokamak. The conditions of anomalous Doppler instability were analyzed. It was found that the instability is characterized by relaxations in the electron cyclotron emission due to relativistic anomalous Doppler instability which transfers energy from parallel to perpendicular motion. And the synchrotron radiation of the runaway electrons increased because of the increasing pitch angle. Therefore, energy of the runaway electrons was limited.

关 键 词：托卡马克 逃逸电子 回旋频率 反常多普勒共振 

分 类 号：O536[理学—等离子体物理] O532[理学—物理]