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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
Progress of theoretical and experimental physics, 03/2013, Letnik: 2013, Številka: 3Journal Article
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.
