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Critical current improvement and resistance evaluation of superconducting joint between Bi2223 tapes
We improved the critical current (Ic) of the superconducting joint between the Bi2223 tapes by introducing the two-step sintering process. The in-field transport Ic of ~ 300 A at 4.2 K and 1 T under a 10−9 Ω criterion was successfully demonstrated. The Ic improvement can probably be attributed to the enhancement of the intergrain critical current density for a Bi2223 intermediate layer. Ultra-low in-field joint resistance below 10−14 Ω at 4.2 K and 1 T was also demonstrated using current decay measurement. To our best knowledge, this study is the first to demonstrate a practical level of in-field transport Ic and ultra-low in-field joint resistance for the superconducting joint between Bi2223 tapes. We believe that this superconducting joint technology will facilitate development of persistent current mode Bi2223 superconducting magnets.
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- 22/12/2021
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- © 2022 IOP Publishing Ltd
This is an author-created, un-copyedited version of an article accepted for publication/published in Superconductor Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6668/ac45a3.
- © 2022 IOP Publishing Ltd
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