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Description
Nb₃Sn thin films on copper represent one of the most promising routes for superconducting radio-frequency accelerating cavities for future colliders. At INFN – Legnaro National Laboratories, Nb₃Sn thin films have been successfully deposited on a QPR sample via DC magnetron sputtering, achieving a surface resistance Rs < 9 nΩ. This work presents the design and development of a dedicated system to scale this deposition recipe from small samples to a full-size 1.3 GHz copper cavity. First results on a mock-up cavity are presented, together with the ongoing adaptation of the established recipe to the new experimental configuration through dedicated sample studies. The samples have been characterized by SEM, EDS and XRD, and their critical temperature has been measured.