• T. Honda, T. Aoto, S. Asaoka, K. Ebihara, K. Furukawa, K. Haga, K. Harada, Y. Honda, T. Ieiri, N. Iida, M. Izawa, T. Kageyama, M. Kikuchi, Y. Kobayashi, K. Marutsuka, A. Mishina, T. Miyajima, H. Miyauchi, S. Nagahashi, T.T. Nakamura, T. Nogami, T. Obina, K. Oide, M. Ono, T. Ozaki, C.O. Pak, H. Sakai, H. Sakai, Y. Sakamoto, S. Sakanaka, H. Sasaki, Y. Sato, K. Satoh, M. Shimada, T. Shioya, M. Tadano, T. Tahara, T. Takahashi, R. Takai, S. Takasaki, Y. Tanimoto, M. Tobiyama, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, M. Yamamoto, Ma. Yoshida, S.I. Yoshimoto
  KEK, Ibaraki

KEK man­ages two syn­chrotron ra­di­a­tion sources, Pho­ton Fac­to­ry stor­age ring (PF-ring) of 2.5 GeV and Pho­ton Fac­to­ry ad­vanced ring (PF-AR) of 6.5 GeV. These rings share an in­jec­tor linac with the two main rings of KEK B-fac­to­ry, 8-GeV HER and 3.5-GeV LER. Re­cent­ly, the linac has suc­ceed­ed in a pulse by pulse mul­ti-en­er­gy ac­cel­er­a­tion. A top-up op­er­a­tion of PF-ring has been re­al­ized as the si­mul­ta­ne­ous con­tin­u­ous in­jec­tion to the 3 rings, PF-ring, HER and LER. De­vel­op­ment of new in­jec­tion scheme using a pulsed sex­tupole mag­net con­tin­ues aim­ing at prac­ti­cal use in the top-up op­er­a­tion. A rapid-po­lar­iza­tion-switch­ing de­vice con­sist­ing of tan­dem two AP­PLE-II type un­du­la­tors has been de­vel­oped at PF-ring. The first un­du­la­tor was in­stalled in 2008, and the sec­ond one will be in­stalled in 2010 sum­mer. PF-AR, op­er­at­ed in a sin­gle-bunch mode at all times, has been suf­fered from sud­den life­time drop phe­nom­e­na at­tribut­ed to dust trap­ping for many years. Using the mov­able elec­trodes in­stalled for ex­per­i­ment, we con­firmed that the dis­charge cre­at­ed by the elec­trode was fol­lowed by the dust trap­ping, and suc­ceed­ed in a vi­su­al ob­ser­va­tion of lu­mi­nous dust streak­ing in front of CCD cam­eras.