T
Takao Asaka
Publications - 70
Citations - 1770
Takao Asaka is an academic researcher. The author has contributed to research in topics: Electron gun & Beam (structure). The author has an hindex of 9, co-authored 70 publications receiving 1597 citations.
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Journal ArticleDOI
A compact X-ray free-electron laser emitting in the sub-ångström region
Tetsuya Ishikawa,Hideki Aoyagi,Takao Asaka,Yoshihiro Asano,Noriyoshi Azumi,T. Bizen,H. Ego,Kenji Fukami,Toru Fukui,Yukito Furukawa,Shunji Goto,Hirofumi Hanaki,Toru Hara,Teruaki Hasegawa,Takaki Hatsui,Atsushi Higashiya,T. Hirono,Naoyasu Hosoda,Miho Ishii,Takahiro Inagaki,Yuichi Inubushi,Toshiro Itoga,Yasumasa Joti,Masahiro Kago,Takashi Kameshima,Hiroaki Kimura,Yoichi Kirihara,Akio Kiyomichi,T. Kobayashi,Chikara Kondo,Togo Kudo,Hirokazu Maesaka,Xavier Maréchal,Takemasa Masuda,Shinichi Matsubara,Takahiro Matsumoto,Tomohiro Matsushita,Sakuo Matsui,Mitsuru Nagasono,Nobuteru Nariyama,Haruhiko Ohashi,Toru Ohata,Takashi Ohshima,Shun Ono,Yuji Otake,Choji Saji,Tatsuyuki Sakurai,Takahiro Sato,Kei Sawada,T. Seike,Katsutoshi Shirasawa,Takashi Sugimoto,Shinsuke Suzuki,Sunao Takahashi,Hideki Takebe,Kunikazu Takeshita,Kenji Tamasaku,Hitoshi Tanaka,Ryotaro Tanaka,Takashi Tanaka,Tadashi Togashi,Kazuaki Togawa,Atsushi Tokuhisa,Hiromitsu Tomizawa,Kensuke Tono,Shukui Wu,Makina Yabashi,Mitsuhiro Yamaga,Akihiro Yamashita,Kenichi Yanagida,Chao Zhang,Tsumoru Shintake,Hideo Kitamura,Noritaka Kumagai +73 more
TL;DR: In this paper, the SPring-8 Angstrom Compact Free-Electron Laser (CFEL) was used for sub-angstrom fundamental-wavelength lasing at the Tokyo National Museum.
Journal ArticleDOI
Stable operation of a self-amplified spontaneous-emission free-electron laser in the extremely ultraviolet region
Tsumoru Shintake,Hitoshi Tanaka,Toru Hara,Takashi Tanaka,Kazuaki Togawa,Makina Yabashi,Yuji Otake,Yoshihiro Asano,Toru Fukui,Teruaki Hasegawa,Atsushi Higashiya,Naoyasu Hosoda,Takahiro Inagaki,Shinobu Inoue,Yujong Kim,Masanobu Kitamura,Noritaka Kumagai,Hirokazu Maesaka,Sakuo Matsui,Mitsuru Nagasono,Takashi Ohshima,Tatsuyuki Sakurai,Kenji Tamasaku,Yoshihito Tanaka,T. Tanikawa,Tadashi Togashi,Shukui Wu,Hideo Kitamura,Tetsuya Ishikawa,Takao Asaka,T. Bizen,Shunji Goto,T. Hirono,Miho Ishii,Hiroaki Kimura,T. Kobayashi,Takemasa Masuda,Tomohiro Matsushita,Xavier Maréchal,Haruhiko Ohashi,Toru Ohata,Katsutoshi Shirasawa,Tetsuya Takagi,Sunao Takahashi,Masao Takeuchi,Ryotaro Tanaka,Akihiro Yamashita,Kenichi Yanagida,Chao Zhang +48 more
TL;DR: In this paper, the authors achieved stable operation of a free-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) scheme at the SPring-8 Compact SASE Source (SCSS) test accelerator in the extremely ultraviolet region.
Journal ArticleDOI
Stable top-up operation at SPring-8
Hitoshi Tanaka,Masatoshi Adachi,Tsuyoshi Aoki,Takao Asaka,Alfred Q. R. Baron,Shin Daté,Kenji Fukami,Yukito Furukawa,Hirofumi Hanaki,Naoyasu Hosoda,Tetsuya Ishikawa,Hiroaki Kimura,Kazuo Kobayashi,T. Kobayashi,Shinji Kohara,Noritaka Kumagai,Mitsuhiro Masaki,Takemasa Masuda,Sakuo Matsui,Akihiko Mizuno,Takeshi Nakamura,Takeshi Nakatani,Takashi Noda,Toru Ohata,Haruo Ohkuma,Takashi Ohshima,Masaya Oishi,Sigeki Sasaki,Jun Schimizu,Masazumi Shoji,Kouichi Soutome,Motohiro Suzuki,Shinsuke Suzuki,Yoshio Suzuki,Shirou Takano,Masaru Takao,Takeo Takashima,Hideki Takebe,Akihisa Takeuchi,Kazuhiro Tamura,Ryotaro Tanaka,Yoshihito Tanaka,Tsutomu Taniuchi,Yukiko Taniuchi,Kouji Tsumaki,Akihiro Yamashita,Kenichi Yanagida,Y. Yoda,Hiroto Yonehara,Tetsuhiko Yorita,Masamichi Yoshioka,Masaki Takata +51 more
TL;DR: The implementation of top-up operation at SPring-8 is described, with a focus on the simultaneous achievement of stability of stored current, beam orbit, purity of an isolated single bunch, and beam injection efficiency.
Journal ArticleDOI
Time-interleaved multienergy acceleration for an x-ray free-electron laser facility
Toru Hara,Kenji Tamasaku,Takao Asaka,Takahiro Inagaki,Yuichi Inubushi,Tetsuo Katayama,Chikara Kondo,Hirokazu Maesaka,Shinichi Matsubara,Takashi Ohshima,Yuji Otake,Tatsuyuki Sakurai,Takahiro Sato,Hitoshi Tanaka,Tadashi Togashi,Kazuaki Togawa,Kensuke Tono,Makina Yabashi,Tetsuya Ishikawa +18 more
TL;DR: In this paper, the authors proposed to deliver bunch-to-bunch energy changed electron beams at the end of the accelerator, which enables quasisimultaneous operation of multi-beam-line in the same undulator hall without degrading the stability and performance of the electron beam.
Journal ArticleDOI
Absolute calibration of imaging plate for GeV electrons
Nobuhiko Nakanii,Kiminori Kondo,T. Yabuuchi,K. Tsuji,K. A. Tanaka,S. Suzuki,Takao Asaka,Kenichi Yanagida,H. Hanaki,T. Kobayashi,K. Makino,T. Yamane,Shuji Miyamoto,Ken Horikawa +13 more
TL;DR: The absolute sensitivity of an imaging plate was calibrated at 1 GeV electron energy using the injector Linac of SPring-8 to extend the sensitivity curve obtained up to 100 MeV in a previous study to GeV range.