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Abstract

Single-pass free-electron lasers based on self-amplified spontaneous emission1,2,3,4 are enabling the generation of laser light at ever shorter wavelengths, including extreme ultraviolet5, soft X-rays and even hard X-rays6,7,8. A typical X-ray free-electron laser is a few kilometres in length and requires an electron-beam energy higher than 10 GeV (refs 6, 8). If such light sources are to become accessible to more researchers, a significant reduction in scale is desirable Here, we report observations of brilliant extreme-ultraviolet radiation from a 55-m-long compact self-amplified spontaneous-emission source, which combines short-period undulators with a high-quality electron source operating at a low acceleration energy of 250 MeV. The radiation power reaches saturation at wavelengths ranging from 51 to 61 nm with a maximum pulse energy of 30 µJ. The ultralow emittance (0.6π mm mrad) of the electron beam from a CeB6 thermionic cathode9 is barely degraded by a multiple-stage bunch compression system that dramatically enhances the beam current from 1 to 300 A. This achievement expands the potential for generating X-ray free-electron laser radiation with a compact 2-GeV machine.

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Acknowledgements

The authors express special thanks to the staff of SPring–8, in particular to T. Hasegawa and S. Tanaka for machine operation, S. Kojima, S. Indo and K. Nakashima for their technical support, H. Tomizawa for his outstanding insights, and H. Suematsu, N. Kumagai and H. Ohno for their continuous encouragement. We also thank H. Matsumoto and H. Baba for developing the C-band accelerator system.

Author information

Author notes

    • Yujong Kim
    • , Masanobu Kitamura
    • , Kazuyuki Onoe
    •  & Tetsuya Takagi

    Present address: Yujong Kim: Free Electron Laser Laboratory, LaSalle Street Extension, Duke University, Durham, North Carolina 27708-0319, USA; Masanobu Kitamura: Nichizou Electronics and Control Corporation, Electronics Systems Division, Nishikujyo 5-3-28, Konohana-ku, Osaka 554-0012, Japan; Kazuyuki Onoe: ULVAC, Head Office, Hagisono 2500, Chigasaki, Kanagawa 253-8543, Japan; Tetsuya Takagi: Takagi Accounting Firm, Minami-Karasuyama 4-28-7, Setagaya, Tokyo 157-0062, Japan

Affiliations

  1. RIKEN, XFEL Project Head Office, Kouto 1-1-1, Sayo, Hyogo 679-5148, Japan

    • Tsumoru Shintake
    • , Hitoshi Tanaka
    • , Toru Hara
    • , Takashi Tanaka
    • , Kazuaki Togawa
    • , Makina Yabashi
    • , Yuji Otake
    • , Yoshihiro Asano
    • , Toru Fukui
    • , Atsushi Higashiya
    • , Naoyasu Hosoda
    • , Takahiro Inagaki
    • , Shinobu Inoue
    • , Yujong Kim
    • , Masanobu Kitamura
    • , Hirokazu Maesaka
    • , Sakuo Matsui
    • , Mitsuru Nagasono
    • , Takashi Ohshima
    • , Kazuyuki Onoe
    • , Katsutoshi Shirasawa
    • , Kenji Tamasaku
    • , Ryotaro Tanaka
    • , Yoshihito Tanaka
    • , Takanori Tanikawa
    • , Tadashi Togashi
    • , Shukui Wu
    • , Hideo Kitamura
    •  & Tetsuya Ishikawa
  2. Japan Synchrotron Radiation Research Institute, Kouto 1-1-1, Sayo, Hyogo 679-5198, Japan

    • Toru Hara
    • , Takashi Tanaka
    • , Yoshihiro Asano
    • , Teruhiko Bizen
    • , Shunji Goto
    • , Toko Hirono
    • , Miho Ishii
    • , Hiroaki Kimura
    • , Toshiaki Kobayashi
    • , Takemasa Masuda
    • , Tomohiro Matsushita
    • , Xavier Maréchal
    • , Haruhiko Ohashi
    • , Toru Ohata
    • , Tetsuya Takagi
    • , Sunao Takahashi
    • , Masao Takeuchi
    • , Ryotaro Tanaka
    • , Akihiro Yamashita
    • , Kenichi Yanagida
    • , Chao Zhang
    •  & Hideo Kitamura

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Correspondence to Makina Yabashi or Yujong Kim or Masanobu Kitamura or Kazuyuki Onoe or Tetsuya Takagi.

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DOI

https://doi.org/10.1038/nphoton.2008.134

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