DocumentCode :
1441791
Title :
Superconducting Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ closed-loop coils carrying persistent current at temperatures above 77 K
Author :
Han, Z. ; Vase, P. ; Shen, Y.Q. ; Freltoft, T.
Author_Institution :
NKT Res. Center A/S, Brondby, Denmark
Volume :
7
Issue :
2
fYear :
1997
fDate :
6/1/1997 12:00:00 AM
Firstpage :
873
Lastpage :
876
Abstract :
We have succeeded in producing superconducting closed-loop coils from Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ tape. These coils can be operated in a persistent current mode even at temperatures above the boiling point of liquid nitrogen. The persistent current density value has been deduced to be 600 A/cm/sup 2/ at 77 K and the current has been estimated to run for 10/sup 16/ years. The persistent critical current density in our coils was about one order of magnitude smaller than the critical current density value determined by a 1 /spl mu/V/cm criterion. The decay behaviour of the current in the coils was clearly separated in two regimes, an initial fast decay of the order of minutes followed by a slow logarithmic-like decay. In this paper, experimental results of the persistent current density as a function of temperature and applied magnetic field are also presented.
Keywords :
bismuth compounds; calcium compounds; high-temperature superconductors; strontium compounds; superconducting coils; superconducting tapes; 77 K; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ tape; persistent current density; superconducting closed-loop coil; Bismuth; Critical current density; High temperature superconductors; Magnetic fields; Persistent currents; Silver; Strontium; Superconducting coils; Superconducting films; Superconducting magnetic energy storage;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.614642
Filename :
614642
Link To Document :
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