Document Type
Conference Paper
Publication Date
2022
DOI
10.18429/JACoW-NAPAC2022-WEPA30
Publication Title
Proceedings of the 5th North American Particle Accelerator Conference
Pages
691-694
Conference Name
NAPAC 2022, 7-12 August, 2022, Albuquerque, New Mexico
Abstract
Nb₃Sn is of interest as a coating for SRF cavities due to its higher transition temperature Tc ~18.3 K and superheating field Hsh ~400 mT, both are twice that of Nb. Nb₃Sn coated cavities can achieve high-quality factors at 4 K and can replace the bulk Nb cavities operated at 2 K. A cylindrical magnetron sputtering system was built, commissioned, and used to deposit Nb₃Sn on the inner surface of a 2.6 GHz single-cell Nb cavity. With two identical cylindrical magnetrons, this system can coat a cavity with high symmetry and uniform thickness. Using Nb-Sn multilayer sequential sputtering followed by annealing at 950°C for 3 hours, polycrystalline Nb₃Sn films were first deposited at the equivalent positions of the cavity’s beam tubes and equator. The film’s composition, crystal structure, and morphology were characterized by energy dispersive spectroscopy, X-ray diffraction, and atomic force microscopy. The Tc of the films was measured by the four-point probe method and was 17.61 to 17.76 K. Based on these studies, ~1.2 micron thick Nb₃Sn was deposited inside a 2.6 GHz Nb cavity. We will discuss first results from samples and cavity coatings, and the status of the coating system.
Rights
© 2022 The Authors.
Published under the terms of the Creative Commons Attribution 4.0 International License. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.
Original Publication Citation
Shakel, M. S., Cao, W., Elsayed-Ali, H., Ermeev, G. V., Pudasaini, U., Sayeed, M. N., & Valente-Feliciano, A.-M. (2022). Nb3Sn coating of a 2.6 GHz SRF Cavity by Sputter Deposition Technique. In S. Biedron, E. Simakov, S. Milton, P. Anisimov, & V.R.W. Schaa (Eds.), Proceedings of the 5th North American Particle Accelerator Conference. https://doi.org/10.18429/JACoW-NAPAC2022-WEPA30
Repository Citation
Shakel, M. S.; Cao, Wei; Elsayed-Ali, H.; Eremeev, G. V.; Pudasaini, U.; and Valente-Feliciano, A. M., "Nb₃Sn Coating of a 2.6 GHz SRF Cavity by Sputter Deposition Technique" (2022). Electrical & Computer Engineering Faculty Publications. 434.
https://digitalcommons.odu.edu/ece_fac_pubs/434