Multi-layer structure formation of relativistic electron beams in plasmas

Abstract

A two-dimensional(2D) electromagnetic particle-in-cell(PIC) simulation model is proposed to study the density evolution and collective stopping of electron beams in background plasmas. We show here the formation of the multi-layer structure of the relativistic electron beam in the plasma due to the different betatron frequency from the beam front to the beam tail. Meanwhile, the nonuniformity of the longitudinal wakefield is the essential reason for the multilayer structure formation in beam phase space. The influences of beam parameters (beam radius and transverse density profile) on the formation of the multi-layer structure and collective stopping in background plasmas are also considered.

Local wavelength evolution and Landau damping of electrostatic plasma wave driven by an ultra-relativistic electron beam in dense inhomogeneous plasma

“…Interaction of relativistic electron beams (REBs) with dense plasma, including beam transport and dissipation, instabilities, plasma heating, etc [33][34][35][36][37][38][39][40][41][42][43][44], has been of much recent interest. However, most studies have been on REB transport in homogeneous plasmas, even though inhomogeneous plasmas are more common in nature and the laboratory.…”