Nonlinear Waves and Coherent Structures in Quasi-neutral Plasmas Excited by External Electromagnetic Radiation

TL;DR

This paper derives a relativistic hydrodynamic model from Vlasov-Maxwell equations for quasi-neutral plasmas, and develops coupled nonlinear Schrödinger equations to describe nonlinear wave structures excited by electromagnetic radiation.

Contribution

It introduces an exact hydrodynamic closure for water-bag distributions and formulates coupled nonlinear Schrödinger equations for plasma wakefields and electron current velocity.

Findings

Derived a relativistic hydrodynamic model from Vlasov-Maxwell equations.

Formulated coupled nonlinear Schrödinger equations for plasma waves.

Obtained explicit traveling wave solutions as formal Volterra series.

Abstract

Starting from the Vlasov-Maxwell equations describing the dynamics of various species in a quasi-neutral plasma, an exact relativistic hydrodynamic closure for a special type of water-bag distributions satisfying the Vlasov equation has been derived. It has been shown that the set of equations for the macroscopic hydrodynamic variables coupled to the wave equations for the self-consistent electromagnetic field is fully equivalent to the Vlasov-Maxwell system. Based on the method of multiple scales, a system comprising a vector nonlinear Schrodinger equation for the transverse envelopes of the self-consistent plasma wakefield, coupled to a scalar nonlinear Schrodinger equation for the electron current velocity envelope, has been derived. Using the method of formal series of Dubois-Violette, a traveling wave solution of the derived set of coupled nonlinear Schrodinger equations in the case of circular wave polarization has been obtained. This solution is represented as a ratio of two formal Volterra series. The terms of these series can be calculated explicitly to every desired order.