Controllable high-quality electron beam generation by phase slippage effect in layered targets

TL;DR

This paper proposes a method to generate high-quality, controllable electron beams using layered plasma targets with increasing density, enhancing energy and beam quality through tailored plasma density profiles.

Contribution

It introduces a novel regime utilizing layered plasmas to improve electron beam energy and quality by controlling wakefield dynamics and electron injection.

Findings

Achieved 0.5 GeV electron beams with less than 0.01 energy spread.

Significant contraction of wakefield size and electron bunch duration.

Enhanced electron acceleration in layered plasma regimes.

Abstract

The bubble structure generated by laser and plasma interactions changes in size depending on the local plasma density. The self injection electrons position with respect to wakefield can be controlled by tailoring the longitudinal plasma density. A regime to enhance the energy of the wakefield accelerated electrons and improve the beam quality is proposed and achieved using layered plasmas with increasing densities. Both the wakefield size and the electron bunch duration are significantly contracted in this regime. The electrons remain in the strong acceleration phase of the wakefield while their energy spread decreases because of their tight spatial distribution. An electron beam of 0.5GeV with less than 0.01 energy spread is obtained through 2.5D PIC simulations.