Fabrication and radio frequency test of large-area MgB2 films on niobium substrates
- Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics and Technology
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Peking Univ., Beijing (China). School of Physics and State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Applied Superconductivity Research Center
Magnesium diboride (MgB2) 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 MgB2 films on metal substrates is needed. Here, in this work, high quality MgB2 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 MgB2 films are presented.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE; National Science Foundation (NSF)
- Grant/Contract Number:
- AC02-76SF00515; 11575012; 51177160; 2011CB808303; 2011CBA00104; LQ13E070002
- OSTI ID:
- 1379941
- Journal Information:
- Superconductor Science and Technology, Vol. 30, Issue 4; ISSN 0953-2048
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Note: Design and resonant condition measurement of the mushroom-shaped Al test cavity for critical magnetic field evaluation of superconducting thin-film sample
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journal | July 2018 |
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