Multi-metallic conduction cooled superconducting radio-frequency cavity with high thermal stability

摘要

Superconducting radio-frequency cavities are commonly used in modern particle accelerators for applied and fundamental research. Such cavities are typically made of high-purity, bulk Nb and with cooling by a liquid helium bath at a temperature of similar to 2 K. The size, cost and complexity of operating a particle accelerator with a liquid helium refrigerator make the current cavity technology not favorable for use in industrial-type accelerators. We have developed a multi-metallic 1.495 GHz elliptical cavity conductively cooled by a cryocooler. The cavity has a similar to 2 mu m thick layer of Nb3Sn on the inner surface, exposed to the rf field, deposited on a similar to 3 mm thick bulk Nb shell and a bulk Cu shell, of thickness > 5