Alternative Cavity for H E Part of the Project X linac

A new superconducting elliptical cavity is suggested for the High Energy (HE) part of the Project X linac. The cavity is suitable to operate in CW regime with high beam current (10 mA), which makes the synergy possible with proposed Accelerator Driven Subcritical systems (ADS) [1]. We present the algorithm of the cavity shape optimization, comprehensive tolerances analysis and the solution for monopole High Order Modes (HOM) damping. Based on these results we estimated the probabilities of cryogenic losses per cryomodule and spread of the longitudinal emittance due to the resonance excitation of monopole HOMs in the HE linac for Project X.