Langmuir wave filamentation in the kinetic regime. II. Weak and Strong Pumping of Nonlinear Electron Plasma Waves as the Route to Filamentation

Abstract

We consider two kinds of pumped Langmuir waves (LWs) in the kinetic regime, $k{\lambda }_D\gtrsim 0.2,$ where $k$ is the LW wavenumber and ${\lambda }_D$ is the Debye length. They are driven to finite amplitude by a coherent external potential whose amplitude is either weak or strong. These dynamically prepared nonlinear LWs develop a transverse (filamentation) instability whose nonlinear evolution destroys the LW's transverse coherence. Instability growth rates in the weakly pumped regime are the same as those of BGK modes considered in Part I, while strongly pumped LWs have higher filamentation grow rates.

12 pages, 24 figures

References in corpus (3)

• Langmuir wave filamentation instability
• Nonlinear frequency shift of electrostatic waves in general collisionless plasma: unifying theory of fluid and kinetic nonlinearities
• Langmuir wave filamentation in the kinetic regime. I. Filamentation instability of Bernstein-Greene-Kruskal modes in multidimensional Vlasov simulations

Cited by in corpus (2)

• Langmuir wave filamentation in the kinetic regime. I. Filamentation instability of Bernstein-Greene-Kruskal modes in multidimensional Vlasov simulations
• Multi-dimensional Vlasov simulations on trapping-induced sidebands of Langmuir waves