Achievement of high current density in Nb  Ti superconducting multifilamentary wires by introducing designed artificial pins

✍ Scribed by K. Yamafuji; N. Harada; Y. Mawatari; K. Funaki; T. Matsushita; K. Matsumoto; O. Miura; Y. Tanaka

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 862 KB
• Volume: 31
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(91)90203-9

✦ Synopsis

It is shown theoretically that a further increase in the overall critical current density of Nb-Ti multifilamentary wire is possible by introducing artificial pinning centres into Nb-Ti filaments in a specified fashion. As the first step towards experimental confirmation of theoretical predictions of the summation of individual forces, Nb-Ti monofilamentary wires were fabricated, in each of which were embedded fine filamentary Nb rods with a given diameter and spacing, to act as artificial pinning centres. These wires show higher critical current densities than have been reported so far, at fields lower than = 2 T. Although the quantitative agreement between the theoretical and observed results is not yet very satisfactory, further investigation of the pinning characteristics using various artificial pins leads to a new stage where it is possible to design the wire parameters for obtaining the required characteristics of critical current density.