Demonstration of Two-Color X-ray Free-Electron Laser Pulses with a Sextupole Magnet

TL;DR

This paper demonstrates a novel, cost-effective method using a sextupole magnet to generate two-color X-ray FEL pulses, enabling tunable, simultaneous multi-energy radiation for advanced scientific applications.

Contribution

Introduces a simple, practical scheme employing a sextupole magnet to produce two-color FEL pulses, expanding capabilities for X-ray experiments.

Findings

Successful generation of two-color FEL pulses with tunable photon energies.

The method effectively suppresses radiation from the bunch core.

Applicable at any repetition rate, with practical advantages discussed.

Abstract

We present measurements of two-color X-ray free electron laser (FEL) pulses generated with a novel scheme utilizing a sextupole magnet. The sextupole, in combination with a standard orbit control tool, is used to suppress the radiation from the bunch core, while keeping the head and the tail of the beam lasing, each at a different photon energy. The method is simple, cost-effective and applicable at any repetition rate. We demonstrate the tunability of the scheme and discuss its advantages and practical limitations.