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Title: Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4913617· OSTI ID:1354828
 [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)

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Materials Sciences and Engineering Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1354828
Journal Information:
Applied Physics Letters, Vol. 106, Issue 8; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (1)

Theory of RF superconductivity for resonant cavities journal January 2017