Study on the metallic coating of the ceramic chamber for the ATF damping ring kicker magnets

A ceramic chamber in the kicker magnet is used to penetrate the fast-changing magnetic field into the beam pipe. On the other hand, the metallic coating inside the ceramic chamber is important to pass the image currents of the beam. For the ATF Damping Ring, it is planned to study the multibunch-beam operation. The requested rise time of the kicker field is less than 60 nsec. Studies to get a suitable metallic coatings inside a long-and-narrow ceramic chamber have been performed and continued. Tests of the sub-micron-thickness coating were carried out as the first stage of our studies