The ARES cavity for KEKB

The ARES (Accelerator Resonantly coupled with Energy Storage) structure is a normal conducting coupled cavity system operated in the π/2 mode designed for use under heavy beam loading environment of the KEK B meson factory (KEKB). Its accelerating cavity is coupled with an energy storage cavity via a resonant coupling cavity. The coupling cavity is equipped with a coaxial antenna damper in order to reduce the impedances of the parasitic 0 and π modes. The ARES structure has been demonstrated through a series of high-power RF tests and high-current beam experiments carried out with two prototype cavities named ARES95 and ARES96, where the former with Quadrupole Counter Mixing (QCM) choke method and the latter with Grooved Beam Pipe (GBP) one for Higher Order Mode (HOM) damping. This paper reports on the production model whose RF design is based on ARES96.