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X-Ray Free-Electron Laser Oscillator (XFELO) - The Concept and Recent R&D Advances

MetadataDetails
Publication Date2015-09-16
AuthorsKwang-Je Kim

An XFELO is a low-gain device making use of repeated low-gain amplification in an x-ray cavity. It will produce fully coherent, highly stable x-ray pulses with meV spectral resolution. With an enhancement of 100 fold in the spectral flux and more than 10,000 fold in the spectral brightness over the latest concepts in near diffraction limited storage rings, it is expected to have a dramatic scientific impact in areas such as elucidating the emergent properties of strongly correlated electrons systems, XPCS, Mossbauer spectroscopy, and experimental quantum optics. There have been significant advances in R&D towards realizing an XFELO: Experimental and theoretical indication that the diamond reflection crystals can endure the intense x-ray exposure inside the optical cavity, demonstration that Be compound refractive lenses can serve as a low-loss, compact focusing elements, and a 5th harmonic XFELO can be operated by 4 GeV superconducting linac to be constructed for the LCLS II project.