Nonlinear Excitation of Acoustic Modes by Large-Amplitude Alfven Waves in a Laboratory Plasma

被引：18

作者：

Dorfman, S. ^{[1
]}

Carter, T. A. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 19期

基金：

美国国家科学基金会;

关键词：

PARAMETRIC DECAY; INSTABILITIES;

D O I：

10.1103/PhysRevLett.110.195001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The nonlinear three-wave interaction process at the heart of the parametric decay process is studied by launching counterpropagating Alfven waves from antennas placed at either end of the Large Plasma Device. A resonance in the beat wave response produced by the two launched Alfven waves is observed and is identified as a damped ion acoustic mode based on the measured dispersion relation. Other properties of the interaction including the spatial profile of the beat mode and response amplitude are also consistent with theoretical predictions for a three-wave interaction driven by a nonlinear ponderomotive force.

引用

页数：5

共 24 条

[1] Existence of electromagnetic-hydrodynamic waves [J].