The input coupler for The KEKB ARES cavity

An input coupler with a disk-type coaxial ceramic window has been constructed for the KEKB ARES cavity system. A power test of the coupler has been carried out with the high-power model of the accelerating cavity of the ARES up to about 110kW rfpower. The coupling constant between the coupler and an energy storage cavity of the ARES has been measured. A test bench of the coupler is being constructed in order to carry out a test with a much higher rf-power.