Magnetically assisted self-injection and radiation generation for plasma based acceleration

TL;DR

This paper demonstrates that external magnetic fields can facilitate controlled self-injection and radiation emission in plasma-based accelerators, potentially improving the precision and efficiency of particle acceleration and radiation generation.

Contribution

It introduces a novel method of magnetic-field assisted self-injection that relaxes trapping thresholds and enables controlled betatron radiation emission in plasma accelerators.

Findings

Magnetic fields relax self-trapping thresholds in plasma accelerators.

Self-trapping location can be controlled by magnetic field profiles.

Magnetic-assisted injection produces well-defined betatron radiation frequencies.

Abstract

It is shown through analytical modeling and numerical simulations that external magnetic fields can relax the self-trapping thresholds in plasma based accelerators. In addition, the transverse location where self-trapping occurs can be selected by adequate choice of the spatial profile of the external magnetic field. We also find that magnetic-field assisted self-injection can lead to the emission of betatron radiation at well defined frequencies. This controlled injection technique could be explored using state-of-the-art magnetic fields in current/next generation plasma/laser wakefield accelerator experiments.