Magnesium Diboride Thin Film Cavity Fabricated by Hybrid Physical Chemical Vapor Deposition

Magnesium diboride (MgB₂) is considered as a potential material for superconducting radio frequency cavities. MgB₂ thin film fabricated on an inner surface of the Cu cavity will allow for a higher operational temperature because of the higher transition temperature of MgB₂ and the high thermal conductivity of Cu. Using the hybrid physical chemical vapor deposition (HPCVD) technique, a uniform MgB₂ coatings were achieved on the inner wall of the 3 GHz Cu cavity. The quality of the films were characterized on small Cu samples which were mounted at different selected locations of the cavity. Preliminary RF result for the MgB₂ thin film cavity will be presented.