Stable operation of a self-amplified spontaneous-emission free-electron laser in the extremely ultraviolet region by 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, Takanori Tanikawa, Tadashi Togashi, Shukui Wu, Hideo Kitamura, Tetsuya Ishikawa, Takao Asaka, Teruhiko Bizen, Shunji Goto, Toko Hirono, Miho Ishii, Hiroaki Kimura, Toshiaki 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

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