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Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
Article numbers 082,602 : digital, PDF file
Additional Creators
Argonne National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Here, we present an analysis of Nb3Sn surface layers grown on a bulk Nb coupon prepared at the same time and by the same vapor diffusion process used to make Nb3Sn coatings on 1.3 GHz Nb cavities. Tunneling spectroscopy reveal a well developed, homogeneous superconducting density of states at the surface with a gap value distribution centered around 2.7 ± 0.4 meV and superconducting critical temperature's (Tc) up to 16.3K. Transmission electron microscopy (TEM) performed on cross sections of the sample's surface shows a ~ 2 microns thick Nb3Sn surface layer. The elemental composition map exhibits a Nb:Sn ratio of 3:1 with buried substoichiometric regions with a ratio of 5:1. Synchrotron diffraction experiments indicate a polycrystalline Nb3Sn film and confirm the presence of Nb rich regions that occupies about a third of the coating volume. These low Tc regions could play an important role in the dissipation mechanisms occurring during RF tests of Nb3Sn -coated Nb cavities and open the way for further improving a very promising alternative to pure Nb cavities for particle accelerators.
Report Numbers
E 1.99:1354828
Subject(s)
Note
Published through SciTech Connect.
02/23/2015.
"111180"
Applied Physics Letters 106 8 ISSN 0003-6951 AM
Chaoyue Becker; Sam Posen; Nickolas Groll; Russell Cook; Christian M. Schlepütz; Daniel Leslie Hall; Matthias Liepe; Michael Pellin; John Zasadzinski; Thomas Proslier.
Materials Sciences and Engineering Division
Funding Information
AC02-06CH11357
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