2017•Institutional Repositories DataBase (IRDB)Open access
Progress of 7-GeV SuperKEKB Injector Linac Upgrade and Commissioning
K. Furukawa, M. Akemoto, Dai Arakawa, Y. Arakida, H. Ego, Atsushi Enomoto, Y. Enomoto, Shigeki Fukuda, Y. Funahashi, T. Higo, Hiroyuki Honma, N. Iida, Mitsuo Ikeda, Hiroshi Kaji, K. Kakihara, T. Kamitani, Hiroaki Katagiri, Masato Kawamura, Kurashina, Miho, Shuji Matsumoto, T. Matsumoto, Hideki Matsushita, Shinichiro Michizono, K. Mikawa, Takako Miura, F. Miyahara, Hiromitsu Nakajima, Katsumi Nakao, Takuya Natsui, Maya Nishida, Yujiro Ogawa, Y. Ohnishi, A. Ohsawa, Feng Qiu, Itsuka Satake, Daisuke Satoh, Masanori Satoh, Yuji Seimiya, A. Shirakawa, Hiroshi Sugimoto, Hitoshi Sugimura, T. Suwada, Toshikazu Takatomi, T. Takenaka, Madoka Tanaka, N. Toge, Y. Yano, K. Yokoyama, Mitsuhiro Yoshida, Rui Zhang, Xiangyu Zhou
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Abstract
KEK injector linac has delivered electrons and positrons for particle physics and photon science experiments for more than 30 years. It is being upgraded for the SuperKEKB project, which aims at a 40-fold increase in luminosity over the previous project KEKB, in order to increase our understanding of new physics beyond the standard model of elementary particle physics. SuperKEKB asymmetric electron and positron collider with its extremely high luminosity requires a high current, low emittance and low energy spread injection beam from the injector. Electron beams will be generated by a new type of RF gun, that will provide a much higher beam current to correspond to a large stored beam current and a short lifetime in the ring. The positron source is another major challenge that enhances the positron bunch intensity from 1 to 4 nC by increasing the positron capture efficiency, and the positron beam emittance is reduced from 2000 micron to 20 micron in the vertical plane by introducing a damping ring, followed by the bunch compressor and energy compressor. The recent status of the upgrade and beam commissioning is reported.