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Title: Magnesium diboride coated bulk niobium: a new approach to higher acceleration gradient

Bulk niobium Superconducting Radio-Frequency cavities are a leading accelerator technology. Their performance is limited by the cavity loss and maximum acceleration gradient, which are negatively affected by vortex penetration into the superconductor when the peak magnetic field at the cavity wall surface exceeds the vortex penetration field (H vp). It has been proposed that coating the inner wall of an SRF cavity with superconducting thin films increases H vp. In this work, we utilized Nb ellipsoid to simulate an inverse SRF cavity and investigate the effect of coating it with magnesium diboride layer on the vortex penetration field. A significant enhancement of H vp was observed. At 2.8 K, H vp increased from 2100 Oe for an uncoated Nb ellipsoid to 2700 Oe for a Nb ellipsoid coated with ~200 nm thick MgB 2 thin film. In conclusion, this finding creates a new route towards achieving higher acceleration gradient in SRF cavity accelerator beyond the theoretical limit of bulk Nb.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Temple University, Philadelphia, PA (United States). Department of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-29490
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396; SC0011616
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; superconducting cavities; MgB(2); Nb; vortex penetration field
OSTI Identifier:
1337099

Tan, Teng, Wolak, M. A., Xi, X. X., Tajima, Tsuyoshi, and Civale, Leonardo. Magnesium diboride coated bulk niobium: a new approach to higher acceleration gradient. United States: N. p., Web. doi:10.1038/srep35879.
Tan, Teng, Wolak, M. A., Xi, X. X., Tajima, Tsuyoshi, & Civale, Leonardo. Magnesium diboride coated bulk niobium: a new approach to higher acceleration gradient. United States. doi:10.1038/srep35879.
Tan, Teng, Wolak, M. A., Xi, X. X., Tajima, Tsuyoshi, and Civale, Leonardo. 2016. "Magnesium diboride coated bulk niobium: a new approach to higher acceleration gradient". United States. doi:10.1038/srep35879. https://www.osti.gov/servlets/purl/1337099.
@article{osti_1337099,
title = {Magnesium diboride coated bulk niobium: a new approach to higher acceleration gradient},
author = {Tan, Teng and Wolak, M. A. and Xi, X. X. and Tajima, Tsuyoshi and Civale, Leonardo},
abstractNote = {Bulk niobium Superconducting Radio-Frequency cavities are a leading accelerator technology. Their performance is limited by the cavity loss and maximum acceleration gradient, which are negatively affected by vortex penetration into the superconductor when the peak magnetic field at the cavity wall surface exceeds the vortex penetration field (Hvp). It has been proposed that coating the inner wall of an SRF cavity with superconducting thin films increases Hvp. In this work, we utilized Nb ellipsoid to simulate an inverse SRF cavity and investigate the effect of coating it with magnesium diboride layer on the vortex penetration field. A significant enhancement of Hvp was observed. At 2.8 K, Hvp increased from 2100 Oe for an uncoated Nb ellipsoid to 2700 Oe for a Nb ellipsoid coated with ~200 nm thick MgB2 thin film. In conclusion, this finding creates a new route towards achieving higher acceleration gradient in SRF cavity accelerator beyond the theoretical limit of bulk Nb.},
doi = {10.1038/srep35879},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {10}
}