Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 28, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/28/6/065017
Keywords
MgB2 wire; superconducting joints; peristent-mode magnets; MRI application; field-decay measurement
Categories
Funding
- Australian Research Council [FT110100170]
- KBSI (Korea Basic Science Institute) Grant [T35519]
- Hyper Tech Research, Inc., USA
- National Research Council of Science & Technology (NST), Republic of Korea [T35500] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Australian Research Council [FT110100170] Funding Source: Australian Research Council
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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 x 10(-12) O at 4.2 K in self-field.
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