Injection induced by coaxial laser interference in laser wakefield accelerators

TL;DR

This paper introduces a novel injection method in laser wakefield accelerators using interference of coaxial laser pulses, enabling high-quality electron beam generation with low energy spread and high charge.

Contribution

It proposes a new injection scheme utilizing coaxial laser interference to produce high-quality electron beams in laser wakefield accelerators.

Findings

High-quality electron beams with low energy spread achieved.

Efficient injection triggered by interference ring patterns.

Simulations confirm effectiveness with moderate laser parameters.

Abstract

A new injection scheme using the interference of two coaxial laser pulses is proposed for generating high quality beams in laser wakefield accelerators. In this scheme, a relatively loosely focused laser pulse drives the plasma wakefield, and a tightly focused laser pulse with similar intensity triggers interference ring pattern which creates onion-like multi sheaths in the plasma wakefield. Due to the wavefront curvature change after the focal position of the tightly focused laser, the innermost sheath of the wakefield expands, which slows down the effective phase velocity of the wakefield and triggers injection of plasma electrons. Particle-in-cell simulations show that high quality electron beams with low energy spread (a few per mill), high charge (hundred picocoulomb) and small emittance (sub millimeter milliradian) at the same time can be generated using moderate laser parameters for properly chosen phase differences between the two lasers.