Document Type

Conference Paper

Publication Date




Publication Title

Proceedings of the 21st International Conference on RF Superconductivity



Conference Name

21st International Conference on RF Superconductivity, June 25-30, 2023, Grand Rapids, Michigan


Nb₃Sn is a next-generation superconducting material that can be used for future superconducting radiofrequency (SRF) accelerator cavities, promising better performance, cost reduction, and higher operating temperature than Nb. The Sn vapor diffusion method is currently the most preferred and successful technique to coat niobium cavities with Nb₃Sn. Among post-coating treatments to optimize the coating quality, higher temperature annealing without Sn is known to degrade Nb₃Sn because of Sn loss. We have investigated Nb₃Sn/Nb samples briefly annealed at 800-1000 °C, for 10 and 20 minutes to potentially improve the surface to enhance the performance of Nb₃Sn-coated cavities. Following the sample studies, a coated single-cell cavity was sequentially annealed at 900 °C and tested its performance each time, improving the cavity’s quality factor relatively. This paper summarizes the sample studies and discusses the RF test results from sequentially annealed SRF Nb₃Sn/Nb cavity.


© 2023 The Authors.

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Original Publication Citation

Tiskumara, J. K., Delayen, J. R., Pudasaini, U., Eremeev, G. (2023). Surface properties and RF performance of vapor diffused Nb3Sn on NB after sequential anneals below 1000 °C. In K. Saito, T. Xu, N. Sakamoto, V. R. W. Schaa, & P. Thomas (Eds.), Proceedings of the 21st International Conference on RF Superconductivity (pp. 428-432). JACoW Publishing.


0000-0001-7212-3550 (Tiskumara)