Title :
Superconducting current leads of Bi-based oxide
Author :
Yamada, Y. ; Yanagiya, T. ; Hasebe, T. ; Jikihara, K. ; Ishizuka, M. ; Yasuhara, S. ; Ishihara, M.
Author_Institution :
Sumitomo Heavy Ind. Ltd., Hiratsuka, Japan
fDate :
3/1/1993 12:00:00 AM
Abstract :
The application of Bi-based oxide bulk superconductors to current leads for various types of superconducting devices was investigated. The bulk was manufactured in the form of a cylindrical tube (inner diameter: 10 to 30 mm; wall thickness: 1.2 to 1.4 mm; length: 200 mm) and had the composition (Bi+Pb):Sr:Ca:Cu=2:2:2:3. Values greater than 1000 A/cm/sup 2/ were obtained for critical current density at 77 K under self-magnetic field. The maximum critical current was 1600 A. Heat leakage was measured between 77 K and 4.2 K while a DC current was passed through the conductor. The heat leakage of a bulk lead pair was 0.16 W, less than one-tenth of that of conventional gas-cooled Cu leads.<>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); heat losses; high-temperature superconductors; lead compounds; strontium compounds; 1.2 to 1.4 mm; 10 to 30 mm; 200 mm; 4.2 to 77 K; Bi/sub 2-x/Pb/sub x/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/; critical current density; current leads; heat leakage; high temperature superconductivity; self-magnetic field; superconducting devices; Current measurement; Heat transfer; High temperature superconductors; Lead compounds; Magnetic field measurement; Plasma measurements; Plasma temperature; Powders; Superconducting devices; Superconductivity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
