Co-Sputtering of Nb3Sn into SRF Cavity Using Composite Target and Optimizing Surface Homogeneity

Conference · Thu Aug 21 04:00:00 EDT 2025 · No journal information

DOI:https://doi.org/10.2172/2998980· OSTI ID:2998980

Shakel, M. S. ^[1]; Elsayed-Ali, H. E. ^[1]; Eremeev, G. ^[2]; Pudasaini, U. ^[3]; Valente-Feliciano, A. M. ^[3]

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1. Old Dominion U.
2. Fermilab
3. Jefferson Lab

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.

• Research Organization: Old Dominion U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: 89243024CSC000002
• OSTI ID: 2998980
• Report Number(s): FERMILAB-POSTER-25-0107-TD; JLAB-ACC-25-4474; oai:inspirehep.net:2963469
• Conference Information: Journal Name: No journal information
• Country of Publication: United States
• Language: English