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Title: Analysis of Nb 3Sn surface layers for superconducting radio frequency cavity applications

Abstract

Here, we present an analysis of Nb 3Sn surface layers grown on a bulk Nb coupon prepared at the same time and by the same vapor diffusion process used to make Nb 3Sn 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 (T c) up to 16.3K. Transmission electron microscopy (TEM) performed on cross sections of the sample's surface shows a ~ 2 microns thick Nb 3Sn 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 Nb 3Sn film and confirm the presence of Nb rich regions that occupies about a third of the coating volume. These low T c regions could play an important role in the dissipation mechanisms occurring during RF tests of Nb 3Sn -coated Nb cavities and open the way for further improving a very promising alternative to pure Nb cavities for particle accelerators.

Authors:
 [1]; ORCiD logo [2];  [3];  [3]; ORCiD logo [3];  [2]; ORCiD logo [4];  [3];  [5];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Illinois Inst. of Technology, Chicago, IL (United States)
  2. Cornell Lab. for Accelerator-Based Sciences and Education, Ithaca, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Cornell Lab. for Accelerator-Based Sciences and Education, Ithaca, NY (United States); Cornell Univ., Ithaca, NY (United States)
  5. Illinois Inst. of Technology, Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Materials Sciences and Engineering Division
OSTI Identifier:
1354828
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 8; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Becker, Chaoyue, Posen, Sam, Groll, Nickolas, Cook, Russell, Schlepütz, Christian M., Hall, Daniel Leslie, Liepe, Matthias, Pellin, Michael, Zasadzinski, John, and Proslier, Thomas. Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications. United States: N. p., 2015. Web. doi:10.1063/1.4913617.
Becker, Chaoyue, Posen, Sam, Groll, Nickolas, Cook, Russell, Schlepütz, Christian M., Hall, Daniel Leslie, Liepe, Matthias, Pellin, Michael, Zasadzinski, John, & Proslier, Thomas. Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications. United States. doi:10.1063/1.4913617.
Becker, Chaoyue, Posen, Sam, Groll, Nickolas, Cook, Russell, Schlepütz, Christian M., Hall, Daniel Leslie, Liepe, Matthias, Pellin, Michael, Zasadzinski, John, and Proslier, Thomas. Mon . "Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications". United States. doi:10.1063/1.4913617. https://www.osti.gov/servlets/purl/1354828.
@article{osti_1354828,
title = {Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications},
author = {Becker, Chaoyue and Posen, Sam and Groll, Nickolas and Cook, Russell and Schlepütz, Christian M. and Hall, Daniel Leslie and Liepe, Matthias and Pellin, Michael and Zasadzinski, John and Proslier, Thomas},
abstractNote = {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.},
doi = {10.1063/1.4913617},
journal = {Applied Physics Letters},
number = 8,
volume = 106,
place = {United States},
year = {Mon Feb 23 00:00:00 EST 2015},
month = {Mon Feb 23 00:00:00 EST 2015}
}

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