Excitation and control of large amplitude standing ion acoustic waves

被引：14
作者：
Friedland, L. [1 ]
Marcus, G. [1 ]
Wurtele, J. S. [2 ]
Michel, P. [3 ]
机构：
[1] Hebrew Univ Jerusalem, IL-91904 Jerusalem, Israel
[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA
来源：
PHYSICS OF PLASMAS | 2019年 / 26卷 / 09期
基金：
美国国家科学基金会;
关键词：
AUTORESONANT NONSTATIONARY EXCITATION; AMPLIFICATION; COMPRESSION; PLASMAS; PULSE;
D O I：
10.1063/1.5122300
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 study the formation of large-amplitude standing ion acoustic waves (SIAWs) by nonlinear phase-locking (autoresonance) with a weak, chirped frequency standing ponderomotive drive. These waves comprise a nonlinear two-phase solution, with each phase locked to one of the two traveling waves comprising the drive. The autoresonance in the system is guaranteed provided that the driving amplitude exceeds a threshold. The phenomenon is illustrated via water bag simulations within a nonlinear ion fluid model and analyzed using Whitham's averaged variational principle. The local ion and electron densities in the autoresonant SIAWs may significantly exceed the initial unperturbed plasma density and are only limited by kinetic wave-breaking.
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