Bandwidth broadening of X-ray free electron laser pulses with the natural gradient of planar undulator

TL;DR

This paper explores how the natural gradient of planar undulators can be utilized to significantly broaden the bandwidth of X-ray free-electron laser pulses, enhancing their versatility for scientific applications.

Contribution

It introduces a novel method using transversely tilted beams and the natural gradient effect to achieve large bandwidth in X-ray FELs, confirmed by simulations.

Findings

Bandwidth increased by an order of magnitude with optimized parameters.

Simulation results confirm theoretical predictions.

Potential for wider scientific application of FELs.

Abstract

Besides the target to pursue the narrow bandwidth X-ray pulses, the large bandwidth free-electron laser pulses are also strongly demanded to satisfy a wide range of scientific user experiments. In this paper, using the transversely tilt beam enabled by deflecting cavity and/or corrugated structure, the potential of large bandwidth X-ray free-electron lasers generation with the natural gradient of the planar undulator are discussed. Simulations confirm the theoretical prediction, and X-ray free-electron laser bandwidth indicates an increase of one order of magnitude with the optimized parameters.