2013•Progress of Theoretical and Experimental PhysicsOpen access
Accelerator design at SuperKEKB
Y. Ohnishi, K. Abe, Toshikazu Adachi, K. Akai, Yasushi Arimoto, Keikichi EBIHARA, K. Egawa, J. Flanagan, H. Fukuma, Y. Funakoshi, K. Furukawa, T. Furuya, N. Iida, H. Iinuma, H. Ikeda, Takuya Ishibashi, M. Iwasaki, T. Kageyama, S. Kamada, T. Kamitani, K. Kanazawa, M. Kikuchi, H. Koiso, M. Masuzawa, T. Mimashi, Takako Miura, T. Mori, A. Morita, T. Nakamura, Kouichiro Nakanishi, Hiroyuki Nakayama, Michiru Nishiwaki, Y. Ogawa, K. Ohmi, N. Ohuchi, K. Oide, T. Oki, Masaaki Ono, M. Satoh, Kaoru Shibata, M. Suetake, Yusuke SUETSUGU, R. Sugahara, Hiroki Sugimoto, T. Suwada, M. Tawada, M. Tobiyama, N. Tokuda, Kiyosumi Tsuchiya, H. Yamaoka, Y. Yano, M. Yoshida, S. Yoshimoto, Demin Zhou, Zhanguo Zong
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Abstract
The SuperKEKB project requires a positron and electron collider with a peak luminosity of 8 × 1035 cm−2 s−1. This luminosity is 40 times that of the KEKB B-factory, which operated for 11 years up to 2010. SuperKEKB is an asymmetry-energy and double-ring collider; the beam energy of the positron (LER) is 4 GeV and that of the electron (HER) is 7 GeV. An extremely small beta function at the interaction point (IP) and a low emittance are necessary. In addition, in order to achieve the target luminosity, a large horizontal crossing angle between two colliding beams is adopted, as is a bunch length much longer than the beta function at the IP. This method is called the “nano-beam scheme”. The beam–beam parameter is assumed to be similar to KEKB, the beta function at the IP is 1/20, and the beam currents are twice those of KEKB in the nano-beam scheme. Consequently, the luminosity gain of 40 with respect to KEKB can be obtained.
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