Kinetic simulations of the self-focusing and dissipation of finite-width electron plasma waves.
Phys Rev Lett
; 111(10): 105002, 2013 Sep 06.
Article
en En
| MEDLINE
| ID: mdl-25166675
ABSTRACT
Two-dimensional simulations, both Vlasov and particle-in-cell, are presented that show the evolution of the field and electron distribution of finite-width, nonlinear electron plasma waves. The intrinsically intertwined effects of self-focusing and dissipation of field energy caused by electron trapping are studied in simulated systems that are hundreds of wavelengths long in the transverse direction but only one wavelength long and periodic in the propagation direction. From various initial wave states, both the width at focus Δm relative to the initial width Δ0 and the maximum field amplitude at focus are shown to be a function of the growth rate of the transverse modulational instability γTPMI divided by the loss rate of field energy νE to electrons escaping the trapping region. With dissipation included, an amplitude threshold for self-focusing γTPMI/νEâ¼1 is found that supports the analysis of Rose [Phys. Plasmas 12, 012318 (2005)].
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Banco de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos