Persistent subplasma-frequency kinetic electrostatic electron nonlinear waves

被引:35
作者
Johnston, T. W. [1 ]
Tyshetskiy, Y. [1 ,2 ]
Ghizzo, A. [3 ]
Bertrand, P. [3 ]
机构
[1] INRS EMT, Varennes, PQ J3X 1S2, Canada
[2] Univ Sydney, Sch Phys, Sydney, NSW 2006, Australia
[3] Univ Henri Poincare, LPMIA, F-154506 Nancy, France
基金
加拿大自然科学与工程研究理事会;
关键词
NUMERICAL-SIMULATION; PLASMA; INSTABILITY; EQUILIBRIA; DYNAMICS; SYSTEMS; MODE; CODE;
D O I
10.1063/1.3094061
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
Driving a one-dimensional collisionless Maxwellian (Vlasov) plasma with a sufficiently strong longitudinal ponderomotive driver for a sufficiently long time results in a self-sustaining nonsinusoidal wave train with well-trapped electrons even for frequencies well below the plasma frequency, i.e., in the plasma wave spectral gap. Typical phase velocities of these waves are somewhat above the electron thermal velocity. This new nonlinear wave is being termed a kinetic electrostatic electron nonlinear (KEEN) wave. The drive duration must exceed the bounce period tau(B) of the trapped electrons subject to the drive, as calculated from the drive force and the linear plasma response to the drive. For a given wavenumber a wide range of KEEN wave frequencies can be readily excited. The basic KEEN structure is essentially kinetic, with the trapped electron density variation being almost completely shielded by the free electrons, leaving just enough net charge to support the wave. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3094061]
引用
收藏
页数:15
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