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Front end of a CW linac of the Project X contains an H source, an RFQ, amedium energy transport line with the beam chopper, and a SC low-beta linacthat accelerates H- from 2.5 MeV to 160 MeV. SC Single Spoke Resonators (SSR)will be used in the linac, because Fermilab already successfully developed andtested a SSR for beta=0.21. Two manufactured cavities achieve 2.5 times morethan design accelerating gradients. One of these cavities completely dressed,e.g. welded to helium vessel with integrated slow and fast tuners, and testedin CW regime. Successful tests of beta=0.21 SSR give us a confidence to usethis type of cavity for low beta (0.117) and for high-beta (0.4) as well. Bothtypes of these cavities are under development. In present report the basicconstrains, parameters, electromagnetic and mechanical design for all the threeSSR cavities, and first test results of beta=0.21 SSR are presented.

CW RF system of the Project-X accelerator front end