DOE OSTI · 2998980
Co-Sputtering of Nb3Sn into SRF Cavity Using Composite Target and Optimizing Surface Homogeneity
Abstract
Nb₃Sn coating method for superconducting radiofrequency (SRF) cavity has been developed following co-sputtering of Nb-Sn composite target using a DC cylindrical sputter coater. Deposition parameters and annealing strategies were optimized for uniform Nb₃Sn coating. 1.5 m Nb-Sn film was deposited onto 2.6 GHz Nb SRF cavity and annealed at 600 C for 6 h, followed by 950 C for 1 h. Cryogenic RF testing confirmed Nb₃Sn formation with Tc = 17.8 K. A post-annealing light Sn recoating process improved the cavity s performance, achieving Q₀ = 8.5 10⁸ at 2.0 K.
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Shakel, M. S. [Old Dominion U.], Elsayed-Ali, H. E. [Old Dominion U.], Eremeev, G. [Fermilab], Pudasaini, U. [Jefferson Lab], Valente-Feliciano, A. M. [Jefferson Lab]. 2025-08-21. Co-Sputtering of Nb3Sn into SRF Cavity Using Composite Target and Optimizing Surface Homogeneity. https://doi.org/10.2172/2998980
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