Document Type

Conference Paper

Publication Date

2023

DOI

10.18429/JACoW-SRF2023-MOPMB019

Publication Title

Proceedings of the 21st International Conference on RF Superconductivity

Pages

114-118

Conference Name

21st International Conference on RF Superconductivity, 25-30 June 2023, East Lansing, Michigan

Abstract

We re­port cal­cu­la­tions of a dc su­per­heat­ing field Hs in su­per­con­duc­tors with nanos­truc­tured sur­faces. Par­tic­u­larly, we per­formed nu­mer­i­cal sim­u­la­tions of the Ginzburg-Lan­dau (GL) equa­tions for a su­per­con­duc­tor with an in­ho­mo­ge­neous pro­file of im­pu­rity con­cen­tra­tion, a thin su­per­con­duct­ing layer on top of an­other su­per­con­duc­tor, and S-I-S mul­ti­lay­ers. The su­per­heat­ing field was cal­cu­lated tak­ing into ac­count the in­sta­bil­ity of the Meiss­ner state at a fi­nite wave­length along the sur­face de­pend­ing on the value of the GL pa­ra­me­ter. Sim­u­la­tions were done for the ma­te­ri­als pa­ra­me­ters of Nb and Nb₃Sn at dif­fer­ent val­ues of the GL pa­ra­me­ter and the mean free paths. We show that the im­pu­rity con­cen­tra­tion pro­file at the sur­face and thick­nesses of su­per­con­duct­ing lay­ers in S-I-S struc­tures can be op­ti­mized to reach the max­i­mum Hs, which ex­ceeds the bulk su­per­heat­ing fields of both Nb and Nb₃Sn. For ex­am­ple, a S-I-S struc­ture with 90 nm thick Nb₃Sn layer on Nb can boost the su­per­heat­ing field up to ~ 500 mT, while pro­tect­ing the SRF cav­ity from den­dritic ther­mo­mag­netic avalanches caused by local pen­e­tra­tion of vor­tices.

Rights

Copyright © 2023 by JACoW.

Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International License. Any further distribution of this work must maintain attribution to the authors, the published article's title, publisher, and DOI.

Original Publication Citation

Walive Pathirange, M. R. P., & Gurevich, A. (2023). Numerical calculations of superheating field in superconductors with nanostructured surfaces. In K. Saito, T. Xu, N. Sakamoto, V.R.W. Schaa, & P. Thomas (Eds.), Proceedings of the 21st International Conference on RF Superconductivity (pp. 114-118). JACoW Publishing. https://doi.org/10.18429/JACoW-SRF2023-MOPMB019

ORCID

0000-0003-0759-8941 (Gurevich)

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