Investigation of the dynamics of ionization induced injected electrons under the influence of beam loading effects

TL;DR

This paper investigates how beam loading effects influence the dynamics of ionization-injected electrons in laser wakefield acceleration, highlighting the role of nitrogen impurity concentration in controlling energy spread and beam quality.

Contribution

It provides a detailed analysis of beam loading effects on ionization-injected electron beams and demonstrates how impurity concentration can optimize energy dispersion.

Findings

Optimal nitrogen concentration reduces energy dispersion.

Final beam emittance is primarily determined by injection process.

Beam energy becomes nearly independent of trapping position at specific impurity levels.

Abstract

In laser-driven wakefield, ionization induced injection is an efficient way to inject electrons in the plasma wave. A detailed study on the beam dynamics under the influence of beam loading effects, which can be controlled by the concentration of nitrogen impurity introduced in the hydrogen gas was conducted. For a specific value of this percentage, the final energy of the high-energy electron bunch becomes nearly independent of the trapped positions, thus leading to a small energy dispersion. We also show that the final beam emittance is mainly determined by the injection process.