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MgB2 superconducting joints for persistent current operation

Journal Article


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Abstract


  • High-performance superconducting joints are essential for realizing persistent-mode magnets.

    Herein, we propose a concept and fabrication of such superconducting joints, which yielded

    reliable performance in the operating temperature range of 4.2–25 K. MgB2–MgB2 joints in

    magnets are known to result in deterioration of localized electrical, thermal, and mechanical

    properties. To overcome these problems, the ends of the two wires are inserted into a pellet press,

    which is then filled with a mixture of unreacted magnesium and boron powders, followed by heat

    treatment. The critical current capacity and joint resistance were precisely evaluated by the

    standard four-probe method in open-circuit and by field-decay measurements in a closed-loop,

    respectively. These joints demonstrated up to 66% of the current-carrying capacity of unjoined

    wire at 20 K, 2 T and joint resistance of 1.4 × 10−12 Ω at 4.2 K in self-field.

Publication Date


  • 2015

Citation


  • Patel, D., Al Hossain, M. Shahriar., See, K. Wai., Xu, X., Barua, S., Ma, Z., Choi, S., Tomsic, M. & Kim, J. (2015). MgB2 superconducting joints for persistent current operation. Superconductor Science and Technology, 28 (6), 065017-1-065017-6.

Scopus Eid


  • 2-s2.0-84929492886

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2402&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1400

Has Global Citation Frequency


Start Page


  • 065017-1

End Page


  • 065017-6

Volume


  • 28

Issue


  • 6

Place Of Publication


  • United Kingdom

Abstract


  • High-performance superconducting joints are essential for realizing persistent-mode magnets.

    Herein, we propose a concept and fabrication of such superconducting joints, which yielded

    reliable performance in the operating temperature range of 4.2–25 K. MgB2–MgB2 joints in

    magnets are known to result in deterioration of localized electrical, thermal, and mechanical

    properties. To overcome these problems, the ends of the two wires are inserted into a pellet press,

    which is then filled with a mixture of unreacted magnesium and boron powders, followed by heat

    treatment. The critical current capacity and joint resistance were precisely evaluated by the

    standard four-probe method in open-circuit and by field-decay measurements in a closed-loop,

    respectively. These joints demonstrated up to 66% of the current-carrying capacity of unjoined

    wire at 20 K, 2 T and joint resistance of 1.4 × 10−12 Ω at 4.2 K in self-field.

Publication Date


  • 2015

Citation


  • Patel, D., Al Hossain, M. Shahriar., See, K. Wai., Xu, X., Barua, S., Ma, Z., Choi, S., Tomsic, M. & Kim, J. (2015). MgB2 superconducting joints for persistent current operation. Superconductor Science and Technology, 28 (6), 065017-1-065017-6.

Scopus Eid


  • 2-s2.0-84929492886

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2402&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1400

Has Global Citation Frequency


Start Page


  • 065017-1

End Page


  • 065017-6

Volume


  • 28

Issue


  • 6

Place Of Publication


  • United Kingdom