The Choke Mode Cavity

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Abstract
A new simple RF structure is proposed for damped accelerating cavities in linear and circular particle accelerators. Almost all of the beam-induced higher-order modes are heavily damped through a radial transmission line terminated with a matched load. The accelerating mode is established by means of an imaginary short due to a choke structure. Preliminary measurements showed good damping properties, while a high Q accelerating mode was maintained. Because the structure has axial-symmetry, it is easy to fabricate, and is especially suitable for mass production of the disk-loaded accelerating structures for future e+e- linear colliders.

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