Proposed Microwave Systems for Superconducting Radiofrequency Beam Separators

In this paper various aspects of the microwave system for RF beam separators using superconducting iris-loaded deflectors are discussed. This microwave system differs significantly from a conventional design. The differences stem mainly from the very high Q, the mandatory standing wave operation, and the lack of frequency adjustments by temperature changes. Successful operation of the separator depends on keeping two narrow bandwidth resonators (Δf ≈ 20 Hz) at the same frequency, fo ≈ 1.3 GHz, and in rigid phase relationship. Mechanical tuning of the deflectors must be provided in the form of a variable path length for a resonant ring or in the form of an adjustable short for a resonant cavity. The resonant deflector can be powered either from a common source or by using the deflector as frequency determining element in an oscillatory system. Both microwave systems are described and their relative merits are compared.