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Title: Fabrication and radio frequency test of large-area MgB2 films on niobium substrates

Journal Article · · Superconductor Science and Technology
 [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

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
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (27)

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Magnesium diboride superconducting RF resonant cavities for high energy particle acceleration journal August 2004
${\hbox{MgB}}_{2}$ for Application to RF Cavities for Accelerators journal June 2007
MgB 2 thin films journal March 2009
Microwave measurements of MgB 2 : implications for applications and order-parameter symmetry journal February 2010
Superconducting RF materials other than bulk niobium: a review journal September 2016
Temperature dependence of the superheating field for superconductors in the high- κ London limit journal December 2008
MgB 2 films fabricated on molybdenum substrate by hybrid physical–chemical vapor deposition for superconducting RF cavity applications journal March 2012
MgB2 Thin Films on Metal Substrates for Superconducting RF Cavity Applications journal January 2013
Using helium as background gas to avoid hydrogen brittleness for MgB2 film fabrication on niobium substrate by HPCVD journal May 2016
Interfacial structure of epitaxial MgB2 thin films grown on (0001) sapphire journal July 2002
Microstructure of MgB2 thin film deposited on r-plane sapphire substrate by co-evaporation method journal October 2009
Study of micron-thick MgB 2 films on niobium substrates journal February 2007
Thick polycrystalline MgB 2 film on Cu substrate by hybrid physical–chemical vapour deposition journal October 2006
Fabrication of superconducting MgB 2 thin films on textured Cu(100) tape by hybrid physical–chemical vapor deposition journal January 2009
Progress in depositing MgB2 films on stainless steel substrate journal February 2007
Note: Radio frequency surface impedance characterization system for superconducting samples at 7.5 GHz journal May 2011
Growth of high-quality large-area MgB 2 thin films by reactive evaporation journal March 2006
High quality MgB 2 thick films and large-area films fabricated by hybrid physical–chemical vapor deposition with a pocket heater journal June 2008
Large-Area \hbox {MgB}_{2} Films Fabricated by Scaled-Up Hybrid Physical–Chemical Vapor Deposition journal January 2013
In situ epitaxial MgB2 thin films for superconducting electronics journal September 2002
Properties of MgB 2 thick film on silicon carbide substrate journal September 2006
Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors journal May 2003
Surface impedance measurements of single crystal MgB 2 films for radiofrequency superconductivity applications journal July 2012
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