Document Type

Conference Paper

Publication Date




Publication Title

Proceedings of the 19th International Conference on RF Superconductivity



Conference Name

19th International Conference on RF Superconductivity, June 30-July 5th, Dresden, Germany


Industrial application of SRF technology would favor the use of cryocoolers to conductively cool SRF cavities for particle accelerators, operating at or above 4.3 K. In order to achieve a lower surface resistance than Nb at 4.3 K, a superconductor with higher critical temperature should be used, whereas a metal with higher thermal conductivity than Nb should be used to conduct the heat to the cryocoolers. A standard 1.5 GHz bulk Nb single-cell cavity has been coated with a ~2 µm thick layer of Nb₃Sn on the inner surface and with a 5 mm thick Cu layer on the outer surface for conduction cooled applications. The cavity performance has been measured at 4.3 K and 2.0 K in liquid He. The cavity reached a peak surface magnetic field of ~40 mT with a quality factor of 6×10⁹ and 3.5×10⁹ at 4.3 K, before and after applying the thick Cu layer, respectively.


Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) license. Any further distribution of this work must maintain attribution to the authors, the published article's title, publisher, and DOI.

Original Publication Citation

Ciovati, G., Cheng, G., Daly, E., Eremeev, G., Henry, J., Rimmer, R., Parajuli, I., & Pudasaini, U. (2019). A multi-layered SRF cavity for conduction cooling applications. In P. Michel, A. Arnold, & V.R.W. Schaa (Eds.) Proceedings of the 19th International Conference on RF Superconductivity (pp. 538-542). Joint Accelerator Conferences Website.


0000-0002-0873-2068 (Parajuli)