Critical current densities of high- T c Bi(Pb)-2223 wire-in-tube, continuous-tube-forming/filling and silver-alloy double-pancake coils at 77 K
Critical currents of superconducting silver and silver-alloy composite double pancake coils of Bi 1.80Pb 0.33Sr 1.87Ca 2.00Cu 3.00O x have been measured at liquid nitrogen temperature. A critical current density of ~ 12.5 kA/cm 2 was measured for a coil fabricated from Bi(Pb)-2223/Ag composite tape...
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Published in | Applied superconductivity Vol. 4; no. 7; pp. 343 - 347 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
1996
|
Online Access | Get full text |
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Summary: | Critical currents of superconducting silver and silver-alloy composite double pancake coils of Bi
1.80Pb
0.33Sr
1.87Ca
2.00Cu
3.00O
x
have been measured at liquid nitrogen temperature. A critical current density of ~ 12.5 kA/cm
2 was measured for a coil fabricated from Bi(Pb)-2223/Ag composite tape of length ~2.2m (~342 Ampere-turns) using the wire-in-tube method. For coils made from alloys of silver (e.g. ~0.02% magnesium), higher critical currents (~ 17 A) have been achieved over those fabricated with tapes processed with pure silver matrix. Transport measurements of normalised
J
c vs
B in fields up to 1 T show encouraging results for wire-in-tube and continuous-tube-forming/filling composite tapes prepared with rolling as the intermediate deformation. These results indicate the feasibility of “high-
T
c
” superconducting magnets in some engineering applications. |
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ISSN: | 0964-1807 1879-1530 |
DOI: | 10.1016/S0964-1807(97)00007-0 |