Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators

Abstract Superconducting radio-frequency (SRF) resonator cavities provide extremely high quality factors > 1010 at 1–2 GHz and 2 K in large linear accelerators of high-energy particles. The maximum accelerating field of SRF cavities is limited by penetration of vortices into the superconductor. P...

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Autores principales:	Chris Sundahl, Junki Makita, Paul B. Welander, Yi-Feng Su, Fumitake Kametani, Lin Xie, Huimin Zhang, Lian Li, Alex Gurevich, Chang-Beom Eom
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/20157251216e4fa09c84677439219a3e
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spelling	oai:doaj.org-article:20157251216e4fa09c84677439219a3e2021-12-02T14:26:51ZDevelopment and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators10.1038/s41598-021-87119-92045-2322https://doaj.org/article/20157251216e4fa09c84677439219a3e2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87119-9https://doaj.org/toc/2045-2322Abstract Superconducting radio-frequency (SRF) resonator cavities provide extremely high quality factors > 1010 at 1–2 GHz and 2 K in large linear accelerators of high-energy particles. The maximum accelerating field of SRF cavities is limited by penetration of vortices into the superconductor. Present state-of-the-art Nb cavities can withstand up to 50 MV/m accelerating gradients and magnetic fields of 200–240 mT which destroy the low-dissipative Meissner state. Achieving higher accelerating gradients requires superconductors with higher thermodynamic critical fields, of which Nb3Sn has emerged as a leading material for the next generation accelerators. To overcome the problem of low vortex penetration field in Nb3Sn, it has been proposed to coat Nb cavities with thin film Nb3Sn multilayers with dielectric interlayers. Here, we report the growth and multi-technique characterization of stoichiometric Nb3Sn/Al2O3 multilayers with good superconducting and RF properties. We developed an adsorption-controlled growth process by co-sputtering Nb and Sn at high temperatures with a high overpressure of Sn. The cross-sectional scanning electron transmission microscope images show no interdiffusion between Al2O3 and Nb3Sn. Low-field RF measurements suggest that our multilayers have quality factor comparable with cavity-grade Nb at 4.2 K. These results provide a materials platform for the development and optimization of high-performance SIS multilayers which could overcome the intrinsic limits of the Nb cavity technology.Chris SundahlJunki MakitaPaul B. WelanderYi-Feng SuFumitake KametaniLin XieHuimin ZhangLian LiAlex GurevichChang-Beom EomNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chris Sundahl Junki Makita Paul B. Welander Yi-Feng Su Fumitake Kametani Lin Xie Huimin Zhang Lian Li Alex Gurevich Chang-Beom Eom Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
description	Abstract Superconducting radio-frequency (SRF) resonator cavities provide extremely high quality factors > 1010 at 1–2 GHz and 2 K in large linear accelerators of high-energy particles. The maximum accelerating field of SRF cavities is limited by penetration of vortices into the superconductor. Present state-of-the-art Nb cavities can withstand up to 50 MV/m accelerating gradients and magnetic fields of 200–240 mT which destroy the low-dissipative Meissner state. Achieving higher accelerating gradients requires superconductors with higher thermodynamic critical fields, of which Nb3Sn has emerged as a leading material for the next generation accelerators. To overcome the problem of low vortex penetration field in Nb3Sn, it has been proposed to coat Nb cavities with thin film Nb3Sn multilayers with dielectric interlayers. Here, we report the growth and multi-technique characterization of stoichiometric Nb3Sn/Al2O3 multilayers with good superconducting and RF properties. We developed an adsorption-controlled growth process by co-sputtering Nb and Sn at high temperatures with a high overpressure of Sn. The cross-sectional scanning electron transmission microscope images show no interdiffusion between Al2O3 and Nb3Sn. Low-field RF measurements suggest that our multilayers have quality factor comparable with cavity-grade Nb at 4.2 K. These results provide a materials platform for the development and optimization of high-performance SIS multilayers which could overcome the intrinsic limits of the Nb cavity technology.
format	article
author	Chris Sundahl Junki Makita Paul B. Welander Yi-Feng Su Fumitake Kametani Lin Xie Huimin Zhang Lian Li Alex Gurevich Chang-Beom Eom
author_facet	Chris Sundahl Junki Makita Paul B. Welander Yi-Feng Su Fumitake Kametani Lin Xie Huimin Zhang Lian Li Alex Gurevich Chang-Beom Eom
author_sort	Chris Sundahl
title	Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
title_short	Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
title_full	Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
title_fullStr	Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
title_full_unstemmed	Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
title_sort	development and characterization of nb3sn/al2o3 superconducting multilayers for particle accelerators
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/20157251216e4fa09c84677439219a3e
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_version_	1718391296557580288

Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators

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