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Advancedacceleration mode switching for simultaneous top-up injectionat kek electron/positron injector linac

Kazuro Furukawa,Mitsuo Akemoto,Dai Arakawa,Yoshio Arakida,Naoko Iida,Mitsuo Ikeda, Hiroshi, Iwase,Hiroyasu Ego,Atsushi Enomoto,Yoshinori Enomoto,Takao Oogoe,Satoshi Ohsawa, Yukiyoshi, Ohnishi,Yuichi Okayasu,Yujiro Ogawa,Kazuhisa Kakihara,Hiroshi Kaji,Hiroaki Katagiri, Takuya, Kamitani, Masato Kawamura,Mitsuo Kikuchi,Itsuka Satake,Masanori Satoh,Xiangyu Zhou, Akihiro, Shirakawa,Hitoshi Sugimura,Tsuyoshi Suwada,Yuji Seimiya,Hirohiko Someya,Tateru Takenaka,Madoka Tanaka,Rui Zhang,Feng Qiu,Nobukazu Toge,Hiromitsu Nakajima,Takuya Natsui, Yasuo, Higashi,Toshiyasu Higo,Yoshihiro Funakoshi,Hiroyuki Honma,Hideki Matsushita,Shuji Matsumoto,Toshihiro Matsumoto,Takako Miura,Katsuhiko Mikawa,Toshihiro Mimashi,Fusashi Miyahara,Yoshiharu Yano,Kazue Yokoyama,Mitsuhiro Yoshida

semanticscholar（2020）

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Abstract
The electron positron injector linac at KEK continues to deliver electrons up to 7 GeV and positrons up to 4 GeV into four storage rings and a positron damping ring for elementary particle physics and photon science. It started the simultaneous top-up injections in May 2019 into those four rings of SuperKEKB HER/LER, PF and PF-AR at various beam properties. This injection scheme requires high-speed switching to match the complex parameters of these rings, and all top-up injections have been successfully achieved for the first time. As the beam lifetime of the SuperKEKB rings are less than ten minutes, this scheme is indispensable for the higher integrated luminosity. It also contributes to those experiments with stable stored beams.
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