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While the linac based single-pass FEL has been successfully operated
in the EUV and x-ray regions for about two decades, the oscillator
FEL has been limited to operating in the longer wavelength region
due to the limitation of high-reflectivity, thermally stable, and
radiation-resistant short-wavelength mirrors. With Duke storage ring FEL,
we have recently extended the shortest lasing wavelength
of the oscillator FEL to 168.6 nm. We have demonstrated lasing wavelength
tuning from 168.6 to 179.7 nm with excellent beam stability.
This progress has been made possible by developing a new FEL configuration
with substantially reduced undulator harmonic radiation on the FEL mirror,
a thermally stable FEL optical cavity, and a new type of high-reflectivity
fluoride-based multilayer coating with a protective capping layer.
Employing this VUV FEL in Compton scattering, we have also produced the
first 120 MeV gamma rays at the High Intensity Gamma-ray Source (HIGS).
Ref: Y.K. Wu et al., J. Appl. Phys. 130, 183101 (2021); doi: 10.1063/5.0064942
This work is partially supported by DOE Grant No. DE-FG02-97ER41033.
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