Instability limits for spontaneous double layer formation

被引：5

作者：

Carr, J., Jr. ^{[1
,2
]}

Galante, M. E. ^{[1
]}

Magee, R. M. ^{[1
,3
]}

McCarren, D. ^{[1
]}

Reynolds, E. ^{[4
]}

Scime, E. E. ^{[1
]}

Sears, S. ^{[1
]}

VanDervort, R. W. ^{[1
]}

机构：

[1] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA

[2] Texas Lutheran Univ, Dept Phys, Seguin, TX 78155 USA

[3] TriAlpha Energy Inc, Foothill Ranch, CA 92610 USA

[4] West Virginia Wesleyan, Dept Phys & Engn, Buckhannon, WV 26201 USA

来源：

PHYSICS OF PLASMAS | 2013年 / 20卷 / 11期

基金：

美国国家科学基金会;

关键词：

PLASMA; EVOLUTION; PARALLEL;

D O I：

10.1063/1.4828360

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：

We present time-resolved measurements that demonstrate that large amplitude electrostatic instabilities appear in pulsed, expanding helicon plasmas at the same time as particularly strong double layers appear in the expansion region. A significant cross-correlation between the electrostatic fluctuations and fluctuations in the number of ions accelerated by the double layer electric field is observed. No correlation is observed between the electrostatic fluctuations and ions that have not passed through the double layer. These measurements confirm that the simultaneous appearance of the electrostatic fluctuations and the double layer is not simple coincidence. In fact, the accelerated ion population is responsible for the growth of the instability. The double layer strength, and therefore, the velocity of the accelerated ions, is limited by the appearance of the electrostatic instability. (C) 2013 AIP Publishing LLC.

引用

页数：7

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