Linac upgrade for superkekb

Takuya Natsui,Mitsuo Akemoto, Yoshio Arakida,Dai Arakawa,Atsushi Enomoto,Shigeki Fukuda,Kazuro Furukawa,Hiroyuki Honma,Naoko Iida, Mitsuo Ikeda, Eiichi Kadokura, Kazuhisa Kakihara,Takuya Kamitani, Hiroaki Katagiri, Miho Kurashina,Hideki Matsushita,Shuji Matsumoto,Toshihiro Matsumoto,Shinichiro Michizono, Katsuhiko Mikawa,Takako Miura, Fusashi Miyahara, Katsumi Nakao,Satoshi Ohsawa,Yujiro Ogawa,Masanori Satoh,Tetsuo Shidara, Akihiro Shirakawa,Tsuyoshi Suwada,Hiroshi Sugimoto, Tateru Takenaka, Yoshiharu Yano, Kazue Yokoyama,Mitsuhiro Yoshida,Lei Zang,Xiangyu Zhou,Ryo Ichimiya,Daisuke SatohB

semanticscholar（2012）

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摘要

The injector linac of KEK is being upgraded for SuperKEKB. High-charge low-emittance electron and positron beams are required for SuperKEKB. The required injection electron beam parameters are 7.0 GeV at 5 nC 20 mm-mrad. A thermal cathode DC gun had been used for KEKB. However the DC gun could not make low-emittance beam. Thus lowemittance new RF gun is being developed. The positron beam will be injected to damping ring for emittance reduction. To obtain positron beam energy of 1.1 GeV at damping ring, primary electron beam energy will be reduced. In addition, charge of positron is 4 nC. Thus positron capture section is very important upgrade point. Some alignment technique has been studied since it is essential for emittance preservation.

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