The design of a pill-box cavity with waveguide HOM suppressors

High suppression of the higher order mode (HOM) spectrum of an accelerating radio frequency cavity can be obtained with two waveguide suppressors coupled through a large aperture to the cavity. Intensive experimental work led us to choose a pill-box shape for the central body of the resonator. Along with a heavy damping of the whole HOM spectrum, the electromagnetic characteristics measured on a 'cold' prototype show that the accelerating performance of the fundamental resonator mode remains satisfactory. After having thoroughly tested the cold prototype, the design of a power resonator has begun. The more interesting aspects of this design, concerning mainly mechanical, thermal and vacuum topics are described. The choice of the microwave absorbing material is discussed as well.<>