Title :
Local Current Transport and Current Sharing Between Filaments in Striated Coated Conductors With Artificial Defects
Author :
Kwon, C. ; Young, J.L. ; James, R.G. ; Levin, George A. ; Haugan, Timothy J. ; Barnes, Paul N.
Author_Institution :
California State Univ., Long Beach
fDate :
6/1/2007 12:00:00 AM
Abstract :
Multifilamentary YBCO coated conductor with fishnet striation pattern is investigated by transport measurements and scanning laser microscopy (SLM). Each filament is clearly visible in SLM images, and higher current flows along the edges of filaments. After initial measurements, an incision is made to disable two filaments and to investigate the changes in the current transport, the current sharing, and the dissipation patterns. Current sharing and redistribution are clearly observed among the filaments and at the weak links. We find that the dissipation is mainly caused by local current crowding. Since the current is to be shared among intact filaments, the most impacted area is the filaments closer to the disabled ones which have to carry higher current. The other susceptible area is the weak links where the current redistributes and the increased current density is expected.
Keywords :
barium compounds; critical currents; current distribution; high-temperature superconductors; multifilamentary superconductors; yttrium compounds; YBa2Cu3O7 - System; artificial defects; current density; current redistribution; current sharing; dissipation; fishnet striation pattern; local current transport; multifilamentary coated conductor; scanning laser microscopy; Conductors; Current density; Current measurement; Helium; Microscopy; Multifilamentary superconductors; Power generation; Proximity effect; Superconducting filaments and wires; Yttrium barium copper oxide; Dissipation pattern; filamentary coated conductor; scanning laser microscopy;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2007.897914