Accelerator design at SuperKEKB

• Published in: Progress of theoretical and experimental physics Vol. 2013; no. 3; p. 3
• Main Authors: Ohnishi, Yukiyoshi, Abe, Tetsuo, Adachi, Toshikazu, Akai, Kazunori, Arimoto, Yasushi, Ebihara, Kiyokazu, Egawa, Kazumi, Flanagan, John, Fukuma, Hitoshi, Funakoshi, Yoshihiro, Furukawa, Kazuro, Furuya, Takaaki, Iida, Naoko, Iinuma, Hiromi, Ikeda, Hoitomi, Ishibashi, Takuya, Iwasaki, Masako, Kageyama, Tatsuya, Kamada, Susumu, Kamitani, Takuya, Kanazawa, Ken-ichi, Kikuchi, Mitsuo, Koiso, Haruyo, Masuzawa, Mika, Mimashi, Toshihiro, Miura, Takako, Mori, Takashi, Morita, Akio, Nakamura, Tatsuro, Nakanishi, Kota, Nakayama, Hiroyuki, Nishiwaki, Michiru, Ogawa, Yujiro, Ohmi, Kazuhito, Ohuchi, Norihito, Oide, Katsunobu, Oki, Toshiyuki, Ono, Masaaki, Satoh, Masanori, Shibata, Kyo, Suetake, Masaaki, Suetsugu, Yusuke, Sugahara, Ryuhei, Sugimoto, Hiroshi, Suwada, Tsuyoshi, Tawada, Masafumi, Tobiyama, Makoto, Tokuda, Noboru, Tsuchiya, Kiyosumi, Yamaoka, Hiroshi, Yano, Yoshiharu, Yoshida, Mitsuhiro, Yoshimoto, Shin-ichi, Zhou, Demin, Zong, Zhanguo
• Format: Journal Article
• Language: English
• Published: Oxford University Press 01.03.2013
• ISSN: 2050-3911; 2050-3911
• DOI: 10.1093/ptep/pts083

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.