Evolution of ultra-relativistic hollow-electron-beam wakefield drivers during their propagation in plasmas

Abstract

Ultra-relativistic hollow electron beams can drive plasma wakefields ($\sim$ GV/m) suitable for positron acceleration. Stable propagation of hollow electron beams for long distances in plasmas is required to accelerate positrons to high energies by these plasma wakefields. In this work, we show by quasi-static kinetic simulations using the code WAKE that an ultra-relativistic azimuthally-symmetric hollow electron beam propagates in a plasma by developing fish-bone like structure and shifting its bulk, differentially along its length (rear part fastest), towards its axis due to the decrease in the betatron time period of beam electrons from the beam-front to beam-rear. Hollow electron beams with small radius collapse into their axis due to the pull by the secondary wakefields generated by some of the beam electrons reaching the axis. Hollow beams with sufficiently large radius, however, can propagate stably in plasmas for several meters and be used for positron acceleration.

arXiv comment8 figures

References in corpus (5)

• Acceleration of electrons in the plasma wakefield of a proton bunch
• Nonlinear laser driven donut wakefields for positron and electron acceleration
• Positron acceleration by plasma wake fields driven by a hollow electron beam
• Measurement of transverse wakefields induced by a misaligned positron bunch in a hollow channel plasma accelerator
• Plasma wakefield acceleration studies using the quasi-static code WAKE

Cited by in corpus (1)

• Positron acceleration in plasma waves driven by non-neutral fireball beams