NbSn multicell cavity coating system at Jefferson Lab.

Superconducting radio frequency niobium cavities are the building blocks of modern accelerators for scientific applications. Lower surface resistance, higher fields, and high operating temperatures advance the reach of the future accelerators for scientific discovery as well as potentially enabling cost-effective industrial solutions. We describe the design and performance of an NbSn coating system that converts the inner surface of niobium cavities to an NbSn film.