LWFA as a Preinjector for XFEL Driver Linac

TL;DR

This paper proposes using laser wakefield acceleration (LWFA) as a preinjector for XFEL linacs, producing femtosecond electron beams with high peak current and ultra-short pulse lengths, potentially simplifying the bunch compression process.

Contribution

It introduces a novel approach of employing LWFA as a preinjector for XFEL, enabling high peak current and ultra-short electron pulses without traditional bunch compression.

Findings

Peak current reaches tens of kA.

Output pulse length as short as 1 fs.

Potential to replace bunch compression techniques.

Abstract

In this paper, we propose to use the LWFA as the preinjector for XFEL driver linac. We can use LWFA to produce the femtosecond electron beam. The peak current of the produced beam can reach tens of $kA$ and is high enough to drive XFEL so that the present bunch compressing technique can be deserted. The output optical pusle length can be as short as $ 1 fs $.