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In recent years, Jelly-rolled Nb/Al composite monofilament Nb3Al superconducting wires with an outer diameter of 30 μm, and multi-stranded Nb3Al wires were successfully fabricated by NIMS in Japan. So, it is necessary to measure the temperature dependence of the critical current of Nb3Al wires in the cryocooler system for the development of superconducting applications cooled by the conduction cooling method. The single and multi-stranded ultrafine Nb3Al superconducting sample wires with different outer diameters were prepared to evaluate the critical current properties. The critical currents of sample wires were evaluated by the current sweep method and constant current method. In this study, the sample wires were soldered to the copper wire to prevent burnout of the sample wire during critical current measurements. Therefore, the amount of current shunted to the copper wire was estimated to accurately evaluate the critical current of the superconducting wire. Also, the critical current of Nb3Al wires due to bending strain (bending radius of 5 to 15 mm) was experimentally investigated. From the critical current measurement results of Nb3Al wires with different cross-sectional structures, it was confirmed that the superconducting properties of the wires were improved by reducing the wire diameter. It was shown that the critical current density of the developed Nb3Al wire is lower than that of REBCO wire but higher than that of commercial NbTi and Nb3Sn wires.

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  © 2023 IEEE. Personal use of this material is permitted.  Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

Keyword: Nb3Al, Superconducting wire, Cryocooler

Date published: 2023-03-20

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY (ISSN: 10518223) vol. 33 issue. 5 p. 1-4

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI: https://doi.org/10.48505/nims.4368

First published URL: https://doi.org/10.1109/TASC.2023.3258911

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Updated at: 2024-01-30 09:30:14 +0900

Published on MDR: 2024-01-25 16:30:21 +0900