• T. Kamitani, M. Akemoto, D.A. Arakawa, A. Enomoto, S. Fukuda, K. Furukawa, T. Higo, H. Honma, K. Hosoyama, N. Iida, M. Ikeda, E. Kadokura, K. Kakihara, H. Katagiri, M. Kikuchi, Y. Kojima, M. Kurashina, S. Matsumoto, T. Matsumoto, H. Matsushita, S. Michizono, K. Mikawa, T. Mimashi, T. Miura, H. Nakajima, K. Nakanishi, K. Nakao, Y. Ogawa, S. Ohsawa, T. Sanami, M. Satoh, T. Shidara, A. Shirakawa, T. Sugimura, T. Suwada, T. Takenaka, M. Tawada, Y. Yano, K. Yokoyama, M. Yoshida
  KEK, Ibaraki

The KEKB-factory will be upgraded for 40 times higher lumnosity (SuperKEKB). The injector linac is required to increase the beam intensities (e-:1nC -> 5nC, e-:1nC -> 4nC) and reduce the emittances (e-:300 -> 20 um, e+: 2100 -> 10 um ) for the SuperKEKB. A photo-cathode RF gun will be introduced to generate the high-intensity and low-emittance electron beams. A positron damping ring will be constructed to reduce the emittance. A new matching device (a flux concentrator or a superconducing magnet) and an L-band capture section will be introduced to increase the positron intensity. Beam line layout down to the damping ring will be rearranged to have sufficient beam acceptance considering the positron emitttance. This paper describes details of the upgrade scheme of the injector linac.