Document Type

Article

Publication Date

2022

DOI

10.1063/5.0083309

Publication Title

Review of Scientific Instruments

Volume

93

Issue

5

Pages

055104 (1-10)

Abstract

Superconducting Radio Frequency (SRF) cavities used in particle accelerators are typically formed from or coated with superconducting materials. Currently, high purity niobium is the material of choice for SRF cavities that have been optimized to operate near their theoretical field limits. This brings about the need for significant R & D efforts to develop next generation superconducting materials that could outperform Nb and keep up with the demands of new accelerator facilities. To achieve high quality factors and accelerating gradients, the cavity material should be able to remain in the superconducting Meissner state under a high RF magnetic field without penetration of quantized magnetic vortices through the cavity wall. Therefore, the magnetic field at which vortices penetrate a superconductor is one of the key parameters of merit of SRF cavities. Techniques to measure the onset of magnetic field penetration on thin film samples need to be developed to mitigate the issues with the conventional magnetometry measurements that are strongly influenced by the film orientation and shape and edge effects. In this work, we report the development of an experimental setup to measure the field of full flux penetration through films and multi-layered superconductors. Our system combines a small superconducting solenoid that can generate a magnetic field of up to 500 mT at the sample surface and three Hall probes to detect the full flux penetration through the superconductor. This setup can be used to study alternative materials that could potentially outperform niobium, as well as superconductor-insulator-superconductor (SIS) multilayer coatings on niobium.

Comments

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in

Senevirathne, I. H., Gurevich, A., & Delayen, J. R. (2022). Direct current magnetic hall probe technique for measurement of field penetration in thin film superconductors for superconducting radio frequency resonators. Review of Scientific Instruments, 93(5), 1-10, Article 055104.

and may be found at https://doi.org/10.1063/5.0083309.

Original Publication Citation

Senevirathne, I. H., Gurevich, A., & Delayen, J. R. (2022). Direct current magnetic hall probe technique for measurement of field penetration in thin film superconductors for superconducting radio frequency resonators. Review of Scientific Instruments, 93(5), 1-10, Article 055104. https://doi.org/10.1063/5.0083309

ORCID

0000-0003-0126-8335 (Senevirathne), 0000-0003-0759-8941 (Gurevich)

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