RT Journal Article
T1 Relativistic quasi-solitons and embedded solitons with circular polarization in cold plasmas
A1 Sánchez Arriaga, Gonzalo
A1 Siminos, E.
AB The existence of localized electromagnetic structures is discussed in the framework of the 1-dimensional relativistic Maxwell-fluid model for a cold plasma with immobile ions. New partially localized solutions are found with a finite-difference algorithm designed to locate numerically exact solutions of the Maxwell-fluid system. These solutions are called quasi-solitons and consist of a localized electromagnetic wave trapped in a self-generated plasma density cavity with oscillations at its tails. They are organized in families characterized by the number of nodes p of the vector potential and exist in a continuous range of parameters in the omega -V plane, where V is the velocity of propagation and. is the vector potential angular frequency. A parametric study shows that the familiar fully localized relativistic solitons are special members of the families of partially localized quasi-solitons. Soliton solution branches with p > 0 are therefore parametrically embedded in the continuum of quasi-solitons. On the other hand, geometric arguments and numerical simulations indicate that p = 0 solitons exist only in the limit of either small amplitude or vanishing velocity. Direct numerical simulations of the Maxwell-fluid model indicate that the p > 0 quasi-solitons ( and embedded solitons) are unstable and lead to wake excitation, while p = 0 quasi-solitons appear stable. This helps explain the ubiquitous observation of structures that resemble p = 0 solitons in numerical simulations of laser-plasma interaction.
PB IOP Publishing
SN 1751-8113
YR 2017
FD 2017-03-31
LK https://hdl.handle.net/10016/32193
UL https://hdl.handle.net/10016/32193
LA eng
NO E. S. is supported by Knut and Alice Wallenberg Foundation (pliona project) and G. S. A. is supported by the Ministerio de Economía y Competitividad of Spain under the Grant No RYC-2014-15357) and the project ENE2014-54960R.
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RD 19 jun. 2024