Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 35, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6668/ac45a3
Keywords
HTS; Bi2223; superconducting joint; persistent current mode
Categories
Funding
- JST Mirai-Program [JPMJMI17A2]
- Special Postdoctoral Researcher Program at RIKEN, Japan
- Center for Instrumental Analysis, College of Science and Engineering, Aoyama Gakuin University
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By introducing a two-step sintering process, we have improved the critical current of the superconducting joint between Bi2223 tapes, and successfully demonstrated its in-field transport and ultra-low in-field resistance. This study provides an important technological foundation for the development of Bi2223 superconducting magnets.
We improved the critical current (I (c)) of the superconducting joint between the Bi2223 tapes by introducing the two-step sintering process. The in-field transport I (c) of similar to 300 A at 4.2 K and 1 T under a 10(-9) omega criterion was successfully demonstrated. The I (c) 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) omega at 4.2 K and 1 T was also demonstrated using current decay measurement. To the best of our knowledge, this study is the first to demonstrate a practical level of in-field transport I (c) 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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