title: Proposal for an x-ray free electron laser oscillator with intermediate energy electron beam.
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 10-25 keV, can be generated with a 3.5 GeV electron beam.
authors.affiliation: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Dai
authors.forename: Haixiao
authors.initials: H
authors.lastname: Deng
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Dai
mesh_terms: D003460:Crystallization; D004583:Electrons; D007834:Lasers; D055620:Optical Phenomena; D009991:Oscillometry / Q000295:instrumentation*; D013057:Spectrum Analysis; D013816:Thermodynamics; D013997:Time Factors; D014965:X-Rays