Trigger-timing signal distribution system for the KEK electron/positron injector linac

The KEK electron/positron injector linac provides a short-pulse electron beam with an energy of 2.5 GeV for the Photon Factory (PF) storage ring, that with an energy of 3 GeV for the Advanced Ring (PF–AR) for pulse X-rays, and single-bunch electron and positron beams with energies of 8 and 3.5 GeV respectively for the KEK B-Factory (KEKB) storage rings. A trigger-timing signal distribution system of the injector linac was newly developed and extended for stable injection to the KEKB rings with the required injection-timing accuracy highly stabilized to less than 30 ps in root mean square because the old trigger system distributed the trigger-timing signals for the injection to the PF ring and the PF–AR with an injection-timing accuracy of 300 ps. In this report the design and its performance of the new trigger-timing signal distribution system are described in detail.