Modelling of pulse train generation for resonant laser wakefield acceleration using a delay mask

TL;DR

This paper introduces a novel method for generating pulse trains from a single laser pulse using a concentric zone mask, enabling resonant laser wakefield acceleration with potential for improved electron injection control.

Contribution

The paper presents a new numerical modeling approach for a pulse train generation technique using a delay mask with concentric zones, tailored for resonant multi-pulse ionization injection.

Findings

Modeling of pulse profiles based on mask geometry

Relationship between mask section parameters and pulse characteristics

Potential application in resonant laser wakefield acceleration

Abstract

A new method for the generation of a train of pulses from a single high-energy, ultra short pulse is presented, suited for Resonant Multi-Pulse Ionization injection. The method is based on different transverse portion of the pulse being delayed by a "mask" sectioned in concentric zones with different thicknesses, in order to deliver multiple laser pulses. The mask is placed right before the last focusing parabola. A hole in the middle of the mask lets part of the original pulse to pass through to drive electron injection. In this paper a full numerical modelling of this scheme is presented. In particular we discuss the spatial and temporal profile of the pulses emerging from the mask and how they are related to the radius and thickness of each section.