Commissioning of a compact multibend achromat lattice NanoTerasu: A new 3 GeV synchrotron radiation facility
S. Obara, Kota Ueshima, T. Asaka, Yuji Hosaka, Koichi Kan, N. Nishimori, Toshitaka Aoki, Hiroyuki Asano, Koichi Haga, Y. Iba, Akira Ihara, Katsumasa Ito, Taiki Iwashita, Masaya Kadowaki, Rento Kanahama, H. Kobayashi, Hideki Kobayashi, Hideo Nishihara, Masaaki NISHIKAWA, Haruhiko Oikawa, Ryota Saida, K. Sakuraba, Kento Sugimoto, Masahiro Suzuki, K Takahashi, Shunya Takahashi, Tatsuki Tanaka, Tsubasa Tsuchiyama, R. Yoshioka, Tsuyoshi Aoki, Hideki Dewa, Takahiro Fujita, M. Kawase, A. Kiyomichi, Takashi Hamano, Mitsuhiro Masaki, Takemasa Masuda, Shinichi Matsubara, Kensuke Okada, C. Saji, T. Taniuchi, Yukiko Taniuchi, Yosuke Ueda, Hiroshi Yamaguchi, Kenichi Yanagida, Kenji Fukami, Naoyasu Hosoda, Miho Ishii, Toshiro Itoga, Eito Iwai, Tamotsu Magome, Masaya Oishi, Takashi Ohshima, Chikara Kondo, Tatsuyuki Sakurai, M. Shoji, Takashi Sugimoto, S. Takano, Kazuhiro Tamura, Takahiro Watanabe, T. Tomai, Noriyoshi Azumi, T. Inagaki, Hirokazu Maesaka, Sunao Takahashi, T. Tanaka, S. Inoue, H. Kumazawa, Kazuki Moriya, Kohei Sakai, Toshio Seno, Hiroshi Sumitomo, Ryoichi Takesako, Shinichiro Tanaka, Ryo Yamamoto, Kazutoshi Yokomachi, Masamichi Yoshioka, Toru Hara, Sakuo Matsui, T. Hiraiwa, Hitoshi Tanaka, H. Ego
Abstract
NanoTerasu, a new 3 GeV synchrotron light source in Japan, began user operation in April 2024. It provides high-brilliance soft to tender x-rays and covers a wide spectral range from ultraviolet to tender x-rays. Its compact storage ring with a circumference of 349 m is based on a four-bend achromat lattice to provide two straight sections in each cell for insertion devices with a natural horizontal emittance of 1.14 nm rad, which is small enough for soft x-rays users. The NanoTerasu accelerator incorporates several innovative technologies, including a full-energy injector C-band linear accelerator with a length of 110 m, an in-vacuum off-axis injection system, a four-bend achromat with B-Q combined bending magnets, and a TM020-mode accelerating cavity with built-in higher-order-mode dampers in the storage ring. This paper presents the accelerator machine commissioning over a half-year period and our model-consistent ring optics correction. The first user operation with a stored beam current of 160 mA is also reported. We summarize the storage ring parameters obtained from the commissioning. This is helpful for estimating the effective optical properties of synchrotron radiation at NanoTerasu.