Magnetic Field Penetration Technique to Study Field Shielding of Multilayered Superconductors

Authors

Iresha Harshani Senevirathne, Old Dominion UniversityFollow
Alex Gurevich, Old Dominion UniversityFollow
Jean R. Delayen, Old Dominion UniversityFollow
A-M Valente-Feliciano

Document Type

Conference Paper

Publication Date

2022

DOI

10.18429/JACoW-SRF2021-SUPTEV001

Publication Title

Proceedings of the 20th International Conference on RF Superconductivity

Pages

112-115

Conference Name

20th International Conference on RF Superconductivity, 27 June- 02 July, 2021, East Lansing, Michigan

Abstract

The SIS structure which consists of alternative thin layers of superconductors and insulators on a bulk niobium has been proposed to shield niobium cavity surface from high magnetic field and hence increase the accelerating gradient. The study of the behavior of multilayer superconductors in an external magnetic field is essential to optimize their SRF performance. In this work we report the development of a simple and efficient technique to measure penetration of magnetic field into bulk, thin film and multilayer superconductors. Experimental setup contains a small superconducting solenoid which can produce a parallel surface magnetic field up to 0.5 T and Hall probes to detect penetrated magnetic field across the superconduct- ing sample. This system was calibrated and used to study the effect of niobium sample thickness on the field of full magnetic flux penetration. We determined the optimum thickness of the niobium substrate to fabricate the multi-layer structure for the measurements in our setup. This technique was used to measure penetration fields of Nb₃Sn thin films and Nb₃Sn/Al₂O₃ multilayers deposited on Al₂O₃ wafers. The system was optimized to mitigate thermo- magnetic flux jumps at low temperatures.

Comments

Published under an Attribution 3.0 Unported (CC BY 3.0) license. Any distribution of this work must maintain attribution to the authors, title of the work, publisher, and DOI.

Publisher landing page available at: https://srf2021.vrws.de

Original Publication Citation

Senevirathne, I.H., Gurevich, A., Delayen, J.R., Valente-Feliciano, A.M. (2022) Magnetic field penetration technique to study field shielding of multilayered superconductors. In K. Saito, T. Xu, N. Sakamoto, Y. Lesage, V.R.W. Schaa (Eds.), Proceedings of the 20th International Conference on RF Superconductivity (pp. 112-115) Joint Accelerator Conferences Website. https://srf2021.vrws.de/papers/suptev001.pdf

ORCID

0000-0003-0759-8941 (Gurevich)

Repository Citation

Senevirathne, Iresha Harshani; Gurevich, Alex; Delayen, Jean R.; and Valente-Feliciano, A-M, "Magnetic Field Penetration Technique to Study Field Shielding of Multilayered Superconductors" (2022). Physics Faculty Publications. 659.
https://digitalcommons.odu.edu/physics_fac_pubs/659