A New Injection and Acceleration Scheme of Positrons in the Laser-Plasma Bubble Regime

TL;DR

This paper proposes a novel laser-driven plasma wakefield method for positron injection and acceleration, utilizing specific beam configurations and forces to produce high-charge, quasi-monoenergetic positron beams, confirmed by theoretical and simulation results.

Contribution

It introduces a new scheme for positron injection and acceleration in laser plasma wakefields, combining theoretical modeling with PIC simulations.

Findings

High-charge positron beams achieved

Positrons can be trapped and accelerated effectively

Scheme confirmed by PIC simulation results

Abstract

A novel approach for positron injection and acceleration in laser driven plasma wakefield is proposed. A theoretical model is developed and confirmed through PIC simulation. One ring-shaped beam and one co-axially propagating Gaussian beam drive wakefields in a preformed plasma volume filled with both electrons and positrons. The laser's ponderomotive force as well as the charge separation force in the front bucket of the first bubble are utilized to provide the transverse momenta of injected positrons and those positrons can be trapped by the focusing field and then accelerated by the wakefield. The simulation shows that a relatively high-charge, quasi-monoenergetic positron beams can be obtained.