BEAM DIAGNOSTICS USING BUNCH-BY-BUNCH FEEDBACK SYSTEMS IN THE KEKB RINGS

摘要

Transverse bunch-by-bunch feedback systems for damping coupled-bunch instabilities in the KEKB rings have been working well since the early stages of the commissioning of the rings. Beam diagnostic systems that are the part of the bunch feedback systems, such as bunch current monitors, betatron-tune measurements systems, and bunch oscillation recorders, have been playing important roles in the tuning of the rings, enabling stable high-luminosity operation. The performance of these diagnostic systems and their control systems is reported.