Conductor design issues for oxide superconductors Part 2: exemplification of stable conductors

✍ Scribed by T Ogasawara

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 305 KB
• Volume: 29
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(89)90003-9

✦ Synopsis

In Part 1 of this Paper, the critical size of Y1Ba2Cu3OT-x (YBCO) has been determined from the magnetic stability criterion. Based on the result, composite conductors of YBCO and copper are designed assuming critical current densities of 1.0 x 109 Am -z at 77 K and 1.0 x 10 l° A m-2at 20 K. A multifilamentary composite of 4 mm in diameter can be operated up to the critical current at 77 K but, at lower temperatures, the self-field instability limits the maximum current. A composite tape conductor is also designed: the thickness of YBCO is 25 /zm and the total thickness of copper is 100 #m. The analysis shows that the tape conductor is quite stable when the wide face is exposed to the coolant. A tape of 20 mm width can attain its critical currents of 500 A at 77 K and 5000 A at 20 K without suffering from magnetic instability.