Proposal for an X-Ray Free Electron Laser Oscillator with Intermediate Energy Electron Beam

TL;DR

This paper proposes a novel method for generating hard x-ray free electron laser radiation at reduced electron beam energies using harmonic lasing in a crystal-based cavity, achieving high power and coherence.

Contribution

It introduces a crystal-based cavity resonant at higher harmonics combined with phase shifting to enable harmonic lasing in x-ray FEL oscillators at lower electron energies.

Findings

Achieves fully coherent x-ray FEL radiation with megawatt peak power.

Operates in the 10-25 keV spectral region.

Uses a 3.5 GeV electron beam for generation.

Abstract

Harmonic lasing of low-gain free electron laser oscillators has been experimentally demonstrated in the terahertz and infrared regions. Recently, the low-gain oscillator has been reconsidered as a promising candidate for hard x-ray free electron lasers, through the use of high reflectivity, high resolution x-ray crystals. In this letter, it is proposed to utilize a crystal-based cavity resonant at a higher harmonic of the undulator radiation, together with phase shifting, to enable harmonic lasing of the x-ray free electron laser oscillator, and hence allow the generation of hard x-ray radiation at a reduced electron beam energy. Results show that fully coherent free electron laser radiation with megawatt peak power, in the spectral region of 10-25keV, can be generated with a 3.5GeV electron beam.