ELECTROSTATIC ION-CYCLOTRON WAVE EXPERIMENTS IN THE WVU Q-MACHINE

被引:29
作者
KOEPKE, ME
AMATUCCI, WE
机构
[1] Department ofPhysics, West VirginiaUniversity, Morgantown, WV
基金
美国国家科学基金会;
关键词
D O I
10.1109/27.199504
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The influence of transverse, localized, dc electric fields (TLE) on the current-driven electrostatic ion-cyclotron (CDEIC) instability is being investigated in a Q machine. A small (diameter approximately 10 ion gyroradii) segmented disk electrode is being used to excite the mode in a narrow electron-current channel along which exists a radial electric field between regions that magnetically map to the different circular segments (separated by a radial gap approximately 3 ion gyroradii). Experiments aimed at demonstrating a TLE dependence in the threshold current for mode excitation are described. A comparison of observed and predicted mode frequencies over a range of magnetic field strengths is presented for the benchmark case of no applied transverse electric field. When the electric field is present, ion-cyclotron fluctuations are observed for cases in which the current is below the CDEIC instability threshold.
引用
收藏
页码:631 / 635
页数:5
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