逃逸电子和不稳定性波反常多普勒共振实验研究  

Experimental investigation of anomalous Doppler resonance of runaway electrons with instability waves

作　　者：竹锦霞[1] 

机构地区：[1]四川文理学院智能制造学院,达州635000

出　　处：《原子与分子物理学报》2017年第4期684-688,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11375004);四川省教育厅科研重点项目(15ZA0321;16ZA0355)

摘　　要：利用电子回旋辐射诊断系统并结合其他相关诊断研究了HL-2A托卡马克中逃逸电子与波间的反常多普勒共振作用.结果显示:欧姆放电下提高等离子密度能抑制逃逸电子束的不稳定性,但等离子密度的再次降低导致逃逸电子又会激发不稳定性波,并耦合不稳定性波发生二次反常多普勒共振作用.利用统计方法分析了HL-2A上不同放电阶段逃逸电子反常多普勒共振阈值(ωpe/ωce)区间大致都在0.17-0.54范围内.此共振机制导致逃逸电子在速度空间被波散射,平行能量转化到垂直能量,pitch角增加,同步辐射功率增强,逃逸电子能量限制在反常多普勒效应的阈值能量附近.基于反常多普勒共振的逃逸抑制能有效减轻逃逸电子对装置第一壁的损坏.In terms of electron cyclotron radiation and related diagnosis, the anomalous Doppler resonance of runaway electrons with instability waves has been investigated in the HL -2A tokamak. The results show that the runaway electron beam instability can be suppressed by increasing plasma density, but the second anomalous Doppler resonance can be excited when decreasing the plasma density. Through statistical methods, 0. 17 -0. 54 regions of anomalous Doppler resonance threshold are found. This resonance interaction causes scattering of the runaway electrons in velocity space and the energy transfer from parallel to perpendicular motion occurs. This reso- nance interaction creates an upper bound on the runaway energy and provides a runaway energy control scenario.

关 键 词：逃逸电子 反常多普勒共振 托卡马克 

分 类 号：O53[理学—等离子体物理]