Design of Transformation-Processed \hbox \hbox Conductors to Balance Drawability and Inter-Filament Decoupling

Transformation-processed Nb 3 Al superconductors should be used in conjunction with a high-melting-point matrix material such as Nb. However, Nb is superconductive below 9 K, which causes low-field instability due to magnetic interfilament coupling at liquid He temperature. One alternative matrix ma...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2013-06, Vol.23 (3), p.6001004-6001004
Main Authors: Banno, N., Takeuchi, T., Nakagawa, K., Sakurai, Y., Tsuchiya, K.
Format: Article
Language:English
Subjects:
Conductors
Couplings
Drawability
hbox{Nb}_{3}\hbox{Al}
interfilament coupling
low field instability
Magnetization
Niobium
Superconducting magnets
Wires
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Summary:Transformation-processed Nb 3 Al superconductors should be used in conjunction with a high-melting-point matrix material such as Nb. However, Nb is superconductive below 9 K, which causes low-field instability due to magnetic interfilament coupling at liquid He temperature. One alternative matrix material is Ta. However, the use of Ta sacrifices the drawability of the precursor wires, increasing the risk of wire breakage during drawing. In this work, a new layout intended to balance drawability and interfilament decoupling is proposed. In this new layout, Nb barrier filaments are concentrated around the central dummy core, and Ta barrier filaments are located so as to magnetically decouple the Nb barrier filaments in the outer filamentary region. The drawability and magnetization behavior of the newly designed Nb 3 Al wires are compared with those of conventional wires.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2012.2235519