Single Spoke Resonators SSR2 (f = 325 MHz) are under development at Fermilab. These superconducting RF cavities can meet requirements of Project X (FNAL) and RISP (Korea). The initial design of SSR2 cavities has been modified and optimized in order to satisfy the necessities of both projects. This paper will discuss the RF optimization of a single spoke resonator with a 50 mm beam pipe aperture and an optimal β of 0.51. The mechanical design of the cavity and the Helium Vessel will also be presented. This is aimed to guarantee a low He pressure sensitivity df/dp of the entire system.
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