Numerical Analysis of Space Charge Effects in Electron Bunches at Laser-Driven Plasma Accelerators

TL;DR

This paper uses numerical simulations to analyze how space charge effects influence high-current electron bunches produced by laser-driven plasma accelerators, highlighting their impact on beam quality and application potential.

Contribution

It provides a detailed numerical analysis of space charge effects in LPA-generated electron bunches using parameters from previous experiments, identifying conditions where space charge dominates.

Findings

Space charge effects can significantly degrade beam quality in LPAs.

Numerical simulations help identify regimes where space charge effects are critical.

Results inform the optimal use of high-current electron beams from LPAs.

Abstract

Laser-driven Plasma Accelerators (LPA) have successfully generated high energy, high charge electron bunches which can reach many kA peak current, over short distances. Space charge issues, even in transport lines as simple as a drift section, have to be carefully taken into account since they can degrade the beam quality, preventing any further application of such electron beams. We analyse the space charge effects within an electron bunch with numerical simulations in order to assess their effect on the beam. We use LPA beam parameters published in previous experimental studies. These studies can give an indication of the working point where space charge can dominate the beam dynamics and has to be taken into account in the application of such beams.