BARC is developing a technology for the accelerator driven subcritical system (ADSS) that will be mainly utilized for the transmutation of nuclear waste and enrichment of U233. Design and prototyping of a superconducting medium velocity cavity has been taken up as a part of the ADSS project. The cavity design for β = 0:49, f = 1050 MHz has been optimized to minimize the peak electric and magnetic fields, with a goal of 5 MV/m of accelerating gradient at a Q>5x10⁹ at 2 K. After the design optimization, two single cell cavities were fabricated from polycrystalline (RRR>200) and large grain (RRR>96) Niobium material. The cavities have been tested at 2K in a vertical cryostat at Jefferson Lab and both achieved the performance specifications.