Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japanand the 29th Linear Accelerator Meeting in Japan (August 4 - 6, 2004, Funabashi Japan)

PRESENT STATUS OF
THE KEK ELECTRON/POSITRON INJECTOR LINAC
Y. Ogawa1 for the electron/positron injector group
KEK, High Energy Accelerator Research Organization, Accelerator Laboratory
1-1 Oho, Tsukuba, Ibaraki 305-0801
Abstract
The KEK electron/positron injector linac has been continuously operating for about ten months a year without any
long shutdown, repeating frequent injections into four different rings (KEKB-LER/HER, Photon Factory-PF/AR). In
January 2003, KEKB has started a continuous injection mode (CIM), in which keeping stored currents almost constantin both rings, the integrated luminosity of KEKB has been considerably improved by nearly 30 %. The CIM, however,imposes severe conditions on the injector linac concerning time for beam tuning and hardware maintenance to assure thehigh beam quality. Issues on linac operation and statistics in these situations are reported as well as various
improvements carried out over a year. R&D activities including a future upgrade for SuperKEKB are also presented.

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