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  • Title: Focusing mirror for x-ray free-electron lasers.
    Author: Mimura H, Morita S, Kimura T, Yamakawa D, Lin W, Uehara Y, Matsuyama S, Yumoto H, Ohashi H, Tamasaku K, Nishino Y, Yabashi M, Ishikawa T, Ohmori H, Yamauchi K.
    Journal: Rev Sci Instrum; 2008 Aug; 79(8):083104. PubMed ID: 19044333.
    Abstract:
    We present the design, fabrication, and evaluation of a large total-reflection mirror for focusing x-ray free-electron laser beams to nanometer dimensions. We used an elliptical focusing mirror made of silicon that was 400 mm long and had a focal length of 550 mm. Electrolytic in-process dressing grinding was used for initial-step figuring and elastic emission machining was employed for final figuring and surface smoothing. A figure accuracy with a peak-to-valley height of 2 nm was achieved across the entire area. Characterization of the focused beam was performed at BL29XUL of SPring-8. The focused beam size was 75 nm at 15 keV, which is almost equal to the theoretical size.
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