Velocity-shear-driven drift waves with simultaneous azimuthal modes in a barium-ion Q-machine plasma

被引：12

作者：

Kaneko, T ^{[1
]}

Reynolds, EW

Hatakeyama, R

Koepke, ME

机构：

[1] Tohoku Univ, Dept Elect Engn, Sendai, Miyagi 9808579, Japan

[2] W Virginia Univ, Dept Phys, Morgantown, WV 26505 USA

来源：

PHYSICS OF PLASMAS | 2005年 / 12卷 / 10期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

D O I：

10.1063/1.2102747

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：

Low-frequency instabilities modified by a field-aligned flow velocity shear are investigated, where the shear is controlled using a concentrically three-segmented ion emitter in a modified double-ended Q-machine [T. Kaneko , Rev. Sci. Instrum. 73, 4218 (2002)]. When the barium-ion flow velocity shear is produced by applying different bias voltages to two of the three segments of the ion source, drift waves having azimuthal mode number m=1, 2, and 3 are observed to be excited simultaneously. It is found that the excitation-threshold value of the shear strength depends on the azimuthal mode number, as expected from a model based on kinetic theory, suggesting that the observations are explained by the competition between inverse electron Landau damping and shear-modified ion Landau damping.

引用

页码：1 / 6

页数：6

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