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Noritaka Kumagai
Researcher at Okinawa Institute of Science and Technology
Publications - 20
Citations - 1688
Noritaka Kumagai is an academic researcher from Okinawa Institute of Science and Technology. The author has contributed to research in topics: Storage ring & Laser. The author has an hindex of 8, co-authored 20 publications receiving 1522 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
Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser
Tadashi Togashi,Eiji J. Takahashi,Katsumi Midorikawa,Makoto Aoyama,Koichi Yamakawa,Takahiro Sato,Atsushi Iwasaki,Shigeki Owada,Tomoya Okino,Kaoru Yamanouchi,Fumihiko Kannari,Akira Yagishita,Hidetoshi Nakano,M.E. Couprie,Kenji Fukami,Takaki Hatsui,Toru Hara,Takashi Kameshima,Hideo Kitamura,Noritaka Kumagai,Shinichi Matsubara,Mitsuru Nagasono,Haruhiko Ohashi,Takashi Ohshima,Yuji Otake,Tsumoru Shintake,Kenji Tamasaku,Hitoshi Tanaka,Takashi Tanaka,Kazuaki Togawa,Hiromitsu Tomizawa,Takahiro Watanabe,Makina Yabashi,Tetsuya Ishikawa +33 more
TL;DR: The random and uncontrollable spikes, which appeared in the spectra of the Self-Amplified Spontaneous Emission (SASE) based FEL radiation without the seeding source, were found to be suppressed drastically to form to a narrow-band, single peak profile at 61.2 nm.
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
Ten-tesla superconducting wiggler at SPring-8 as a photon source for nuclear astrophysics
TL;DR: The 10-T superconducting wiggler at SPring-8 is an ideal photon source for nuclear astrophysics experiments because it produces high-energy synchrotron radiations with equivalent blackbody temperatures being billions of Kelvin this article.
Journal ArticleDOI
Beam commissioning and achieved performance of SPring-8 storage ring phase-2 lattice with four magnet-free long straight sections
Hitoshi Tanaka,Kouichi Soutome,Masaru Takao,M. Masaki,Haruo Ohkuma,Noritaka Kumagai,Jun Schimizu +6 more
TL;DR: In this article, a quasi-transparent matching of sextupole fields was proposed to solve the problem of the lattice modification in the SPring-8 storage ring.