Generation of Coherent X-Ray Radiation Through Modulation Compression

TL;DR

This paper presents a novel scheme for generating tunable coherent X-ray radiation using energy modulation and compression techniques on an electron beam, enabling high-power, ultra-short pulses at nanometer wavelengths.

Contribution

The paper introduces a new method combining laser modulation and bunch compression to produce tunable, high-power coherent X-ray pulses from a relatively low-current electron beam.

Findings

Generated over 400 MW X-ray pulses

Achieved 170 attoseconds pulse duration

Produced 1 nm wavelength coherent X-ray radiation

Abstract

In this paper, we propose a scheme to generate tunable coherent X-ray radiation for future light source applications. This scheme uses an energy chirped electron beam, a laser modulator, a laser chirper and two bunch compressors to generate a prebunched kilo-Ampere current electron beam from a few tens Ampere electron beam out of a linac. The initial modulation energy wavelength can be compressed by a factor of $1+h_b R_{56}^a$ in phase space, where $h_b$ is the energy bunch length chirp introduced by the laser chirper, $R_{56}^a$ is the momentum compaction factor of the first bunch compressor. As an illustration, we present an example to generate more than 400 MW, 170 attoseconds pulse, 1 nm coherent X-ray radiation using a 60 Ampere electron beam out of the linac and 200 nm laser seed. Both the final wavelength and the radiation pulse length in the proposed scheme are tunable by adjusting the compression factor and the laser parameters.