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Title: Growth of magnesium diboride films on 2 inch diameter copper discs by hybrid physical–chemical vapor deposition

Here, magnesium diboride (MgB 2) coating is a potential candidate to replace bulk niobium (Nb) for superconducting radio frequency cavities due to the appealing superconducting properties of MgB 2. MgB 2 coating on copper may allow cavity operation near 20–25 K as a result of the high transition temperature (T c) of MgB 2 and excellent thermal conductivity of Cu. We have grown MgB 2 films on 2 inch diameter Cu discs by hybrid physical–chemical vapor deposition for radio frequency characterization. Structural and elemental analyses showed a uniform MgB 2 coating on top of a Mg–Cu alloy layer with occasional intrusion of Mg–Cu alloy regions. High T c values of around 37 K and high critical current density (J c) on the order of 107 A cm –2 at zero field were observed. Radio frequency measurements at 11.4 GHz confirmed a high T c and showed a quality factor (Q 0) much higher than for Cu and close to that of Nb.
Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Grant/Contract Number:
AC02-06CH11357; AC02-76SF00515; SC0011616; N0014-12-1-0777
Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 30; Journal Issue: 4; Journal ID: ISSN 0953-2048
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnesium diboride; thin films; superconducting radio frequency cavity
OSTI Identifier:
1373281
Alternate Identifier(s):
OSTI ID: 1360953

Withanage, Wenura K., Xi, X. X., Nassiri, Alireza, Lee, Namhoon, Wolak, Matthäus A., Tan, Teng, Welander, Paul B., Franzi, Matthew, Tantawi, Sami, and Kustom, Robert L.. Growth of magnesium diboride films on 2 inch diameter copper discs by hybrid physical–chemical vapor deposition. United States: N. p., Web. doi:10.1088/1361-6668/aa5999.
Withanage, Wenura K., Xi, X. X., Nassiri, Alireza, Lee, Namhoon, Wolak, Matthäus A., Tan, Teng, Welander, Paul B., Franzi, Matthew, Tantawi, Sami, & Kustom, Robert L.. Growth of magnesium diboride films on 2 inch diameter copper discs by hybrid physical–chemical vapor deposition. United States. doi:10.1088/1361-6668/aa5999.
Withanage, Wenura K., Xi, X. X., Nassiri, Alireza, Lee, Namhoon, Wolak, Matthäus A., Tan, Teng, Welander, Paul B., Franzi, Matthew, Tantawi, Sami, and Kustom, Robert L.. 2017. "Growth of magnesium diboride films on 2 inch diameter copper discs by hybrid physical–chemical vapor deposition". United States. doi:10.1088/1361-6668/aa5999. https://www.osti.gov/servlets/purl/1373281.
@article{osti_1373281,
title = {Growth of magnesium diboride films on 2 inch diameter copper discs by hybrid physical–chemical vapor deposition},
author = {Withanage, Wenura K. and Xi, X. X. and Nassiri, Alireza and Lee, Namhoon and Wolak, Matthäus A. and Tan, Teng and Welander, Paul B. and Franzi, Matthew and Tantawi, Sami and Kustom, Robert L.},
abstractNote = {Here, magnesium diboride (MgB2) coating is a potential candidate to replace bulk niobium (Nb) for superconducting radio frequency cavities due to the appealing superconducting properties of MgB2. MgB2 coating on copper may allow cavity operation near 20–25 K as a result of the high transition temperature (T c) of MgB2 and excellent thermal conductivity of Cu. We have grown MgB2 films on 2 inch diameter Cu discs by hybrid physical–chemical vapor deposition for radio frequency characterization. Structural and elemental analyses showed a uniform MgB2 coating on top of a Mg–Cu alloy layer with occasional intrusion of Mg–Cu alloy regions. High T c values of around 37 K and high critical current density (J c) on the order of 107 A cm–2 at zero field were observed. Radio frequency measurements at 11.4 GHz confirmed a high T c and showed a quality factor (Q 0) much higher than for Cu and close to that of Nb.},
doi = {10.1088/1361-6668/aa5999},
journal = {Superconductor Science and Technology},
number = 4,
volume = 30,
place = {United States},
year = {2017},
month = {2}
}