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

Journal Article


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 Ω 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.

Authors


  •   Patel, Dipakkumar (external author)
  •   Kim, Su Hun (external author)
  •   Qiu, Wenbin (external author)
  •   Maeda, Minoru (external author)
  •   Matsumoto, Akiyoshi (external author)
  •   Nishijima, Gen (external author)
  •   Kumakura, Hiroaki (external author)
  •   Choi, Seyong (external author)
  •   Kim, Jung Ho

Publication Date


  • 2019

Citation


  • Patel, D., Kim, S., Qiu, W., Maeda, M., Matsumoto, A., Nishijima, G., Kumakura, H., Choi, S. & Kim, J. Ho. (2019). Niobium-titanium (Nb-Ti) superconducting joints for persistent-mode operation. Scientific Reports, 9 (1), 14287-1-14287-7.

Scopus Eid


  • 2-s2.0-85072911459

Start Page


  • 14287-1

End Page


  • 14287-7

Volume


  • 9

Issue


  • 1

Place Of Publication


  • United Kingdom

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 Ω 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.

Authors


  •   Patel, Dipakkumar (external author)
  •   Kim, Su Hun (external author)
  •   Qiu, Wenbin (external author)
  •   Maeda, Minoru (external author)
  •   Matsumoto, Akiyoshi (external author)
  •   Nishijima, Gen (external author)
  •   Kumakura, Hiroaki (external author)
  •   Choi, Seyong (external author)
  •   Kim, Jung Ho

Publication Date


  • 2019

Citation


  • Patel, D., Kim, S., Qiu, W., Maeda, M., Matsumoto, A., Nishijima, G., Kumakura, H., Choi, S. & Kim, J. Ho. (2019). Niobium-titanium (Nb-Ti) superconducting joints for persistent-mode operation. Scientific Reports, 9 (1), 14287-1-14287-7.

Scopus Eid


  • 2-s2.0-85072911459

Start Page


  • 14287-1

End Page


  • 14287-7

Volume


  • 9

Issue


  • 1

Place Of Publication


  • United Kingdom