Design and testing of current leads made from AgAu sheathed Bi-2223 superconducting wires

✍ Scribed by T. Sasaoka; J. Sato; K. Fukushima; M. Okada; M. Endo; Y. Yaegashi; M. Nagano

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 826 KB
• Volume: 37
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(97)00038-6

✦ Synopsis

A pair of current leads consisting of spirally assembled AS-Au sheathed Bi-2223 superconducting wires was fabricated. The heat leak into liquid helium (LHe) was measured in a vapour cooler under a self-cooling condition. The heat cycle of the fabricated superconducting current lead had no influence on the characteristics of both superconducting and joint parts. The measured heat leaks were 0.06 W per lead at OA and 0.13 W per lead at 1000 A; these are about one-tenth those of conventional copper lead. About half of the heat leak at 1000 A involved resistive heat load caused by the joint resistance of the terminal connected to the short lead for short-circuit use when immersed in LHe.