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Title: Fabrication and radio frequency test of large-area MgB 2 films on niobium substrates

Magnesium diboride (MgB 2) is a promising candidate material for superconducting radio frequency (RF) cavities because of its higher transition temperature and critical field compared with niobium. To meet the demand of RF test devices, the fabrication of large-area MgB 2 films on metal substrates is needed. Here, in this work, high quality MgB 2 films with 50 mm diameter were fabricated on niobium by using an improved HPCVD system at Peking University, and RF tests were carried out at SLAC National Accelerator Laboratory. The transition temperature is approximately 39.6 K and the RF surface resistance is about 120 μΩ at 4 K and 11.4 GHz. Finally, the fabrication processes, surface morphology, DC superconducting properties and RF tests of these large-area MgB 2 films are presented.
 [1] ;  [1] ;  [2] ;  [3] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics and Technology
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Peking Univ., Beijing (China). School of Physics and State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Applied Superconductivity Research Center
Publication Date:
Grant/Contract Number:
AC02-76SF00515; 11575012; 51177160; 2011CB808303; 2011CBA00104; LQ13E070002
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 30; Journal Issue: 4; Journal ID: ISSN 0953-2048
IOP Publishing
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
36 MATERIALS SCIENCE; large-area MgB2 flim; Nb substrate; HPCVD; cryogenic RF test; surface resistance
OSTI Identifier: