THE KEKB TIMING SYSTEM

摘要

The KEKB control system required a new timing system to match low longitudinal acceptance due to low alpha machine. This timing system is based on frequency divider/multiply technique and digital delay technique. The KEKB timing system is a little complicated, because KEKB ring RF frequency (508.887MHz) is not a divisor of Linac RF frequency (2856MHz). The KEKB ring frequency and the Linac frequency is locked with a common divisor frequency (10.385MHz). The common divisor frequency determines injection timing. This paper describes the overview of KEKB timing system and RF bucket selection system.