Design Study of a Superconducting Radiofrequency Beam Separator

A design study of a superconducting RF beam separator suitable for counter beams is presented. A simple two-deflector separation scheme permits one-contaminant rejection in momentum ranges from 8.5 to 19 GeV/c for P and ¿ beams and from 4.5 to 10 GeV/c for K beams. The operating wavelength ¿ = 24 cm was obtained by optimizing the transmission of wanted particles. An interdeflector spacing of L = 33 m follows. The geometrical configuration of the lead-coated iris-loaded structure is selected for highest bandwidth which is obtained when the ratio of aperture radius and wavelength is close to 0.2. The maximum deflecting field in the 3 m long resonant ring deflector is limited to about 7 MV/m. The superconducting structure is expected to have a shunt impedance of R ¿ 1012 ¿/m and an unloaded quality factor of Qo ¿ 1.5 × 109. The ensuing RF power requirements are discussed.