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

Sundahl，Chris1; Makita，Junki2; Welander，Paul B.3; Su，Yi Feng4; Kametani，Fumitake4,5; Xie，Lin6; Zhang，Huimin7; Li，Lian7; Gurevich，Alex2; Eom，Chang Beom1

2021-12-01

10.1038/s41598-021-87119-9

Scientific Reports   影响因子和分区

2045-2322

Superconducting radio-frequency (SRF) resonator cavities provide extremely high quality factors > 10 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 NbSn has emerged as a leading material for the next generation accelerators. To overcome the problem of low vortex penetration field in NbSn, it has been proposed to coat Nb cavities with thin film NbSn multilayers with dielectric interlayers. Here, we report the growth and multi-technique characterization of stoichiometric NbSn/AlO 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 AlO and NbSn. 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.

SCI

英语

其他

WOS:000639562100090

2-s2.0-85104068930

Scopus

1.Department of Materials Science and Engineering,University of Wisconsin-Madison,Madison,53706,United States
2.Physics Department and Center for Accelerator Science,Old Dominion University,Norfolk,23529,United States
3.SLAC National Accelerator Laboratory,Menlo Park,94025,United States
4.Applied Superconductivity Center,National High Magnetic Field Laboratory,Florida State University,Tallahassee,32310,United States
5.Department of Mechanical Engineering,FAMU-FSU College of Engineering,Tallahassee,32310,United States
6.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
7.Department of Physics and Astronomy,West Virginia University,Morgantown,26506,United States

Sundahl，Chris,Makita，Junki,Welander，Paul B.,et al. Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators[J]. Scientific Reports,2021,11(1).

Sundahl，Chris.,Makita，Junki.,Welander，Paul B..,Su，Yi Feng.,Kametani，Fumitake.,...&Eom，Chang Beom.(2021).Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators.Scientific Reports,11(1).

Sundahl，Chris,et al."Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators".Scientific Reports 11.1(2021).