Novel open cavity design for rotating mode rf pulse compressors

A new X-band high-power rotating mode SLAC Energy Doubler (SLED)-type rf pulse compressor is proposed. It is based on a novel cavity type, a single open bowl-shaped energy storage cavity with high quality factor and compact size, which is coupled to the waveguide using a compact rotating mode launcher. The novel cavity type is applied to the rf pulse compression system of the main linac rf module of the klystron-based option of the Compact Linear Collider (CLIC). Quasi-spherical rotating modes of TE_{1,2,4} and TE_{1,2,13} are proposed for the correction cavity and storage cavity of the rf pulse compression system respectively. The storage cavity working at TE_{1,2,13} has a quality factor of 240000 and a diameter less than 33 cm. The design of the pulse compressor and in particular of the high-Q cavity will be presented in detail.