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Niobium-titanium (Nb-Ti) superconducting joints for persistent-mode operation.

ABSTRACT: Superconducting joints are essential for persistent-mode operation in a superconducting magnet system to produce an ultra-stable magnetic field. Herein, we report rationally designed niobium-titanium (Nb-Ti) superconducting joints and their evaluation results in detail. For practical applications, superconducting joints were fabricated by using a solder matrix replacement method with two types of lead-bismuth (Pb-Bi) solder, including Pb42Bi58 as a new composition. All the joints attained a critical current of >200?A below 1.43?T at 4.2?K. Our optimized superconducting joining method was tested in a closed-loop coil, obtaining a total circuit resistance of 3.25?×?10-14 ? at 4.2?K in self-field. Finally, persistent-mode operation was demonstrated in an Nb-Ti solenoid coil with a persistent-current switch. This work will pave the way to developing high-performance Nb-Ti superconducting joints for practical applications.

SUBMITTER: Patel D

PROVIDER: S-EPMC6776530 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Niobium-titanium (Nb-Ti) superconducting joints for persistent-mode operation.

Patel Dipak D Kim Su-Hun SH Qiu Wenbin W Maeda Minoru M Matsumoto Akiyoshi A Nishijima Gen G Kumakura Hiroaki H Choi Seyong S Kim Jung Ho JH

Scientific reports 20191003 1

Superconducting joints are essential for persistent-mode operation in a superconducting magnet system to produce an ultra-stable magnetic field. Herein, we report rationally designed niobium-titanium (Nb-Ti) superconducting joints and their evaluation results in detail. For practical applications, superconducting joints were fabricated by using a solder matrix replacement method with two types of lead-bismuth (Pb-Bi) solder, including Pb42Bi58 as a new composition. All the ...[more]

PMID: 31582758

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