Title :
AC Losses of Copper Stabilized Multifilament YBCO Coated Conductors
Author :
Levin, George A. ; Murphy, John ; Haugan, Timothy J. ; Scouc, J. ; Kovac, J. ; Kovac, Pavol
Author_Institution :
UES, Inc., Dayton, OH, USA
Abstract :
We report the data on magnetization losses and critical current of multifilament copper stabilized coated conductors. Eight centimeters long samples of copper-stabilized YBa2Cu3O7-x (YBCO) coated conductors manufactured commercially were subdivided into superconducting filaments by near-IR laser micromachining. The width of the superconducting stripes was varied from 0.2 to 0.04 mm. Some of the samples were striated leaving superconducting bridges for current sharing between the filaments. The ac losses were measured at different sweep rates of the magnetic field up to 14 T/s. We will present the results for the hysteresis and coupling losses and discuss the means to reduce the coupling loss by changing the processing parameters of micromachining and by post-ablation treatment.
Keywords :
barium compounds; critical currents; eddy current losses; high-temperature superconductors; laser ablation; laser beam machining; magnetic hysteresis; magnetic leakage; micromachining; multifilamentary superconductors; yttrium compounds; AC losses; YBa2Cu3O7-x; copper stabilized multifilament YBCO coated conductors; coupling loss; critical current; current sharing; hysteresis loss; magnetic field; magnetization losses; micromachining processing parameters; near-IR laser micromachining; post-ablation treatment; size 0.04 mm to 0.2 mm; size 8 cm; superconducting bridges; superconducting filaments; superconducting stripe width; sweep rates; Conductors; Copper; Couplings; Critical current; Current measurement; Loss measurement; Yttrium barium copper oxide; AC loss; coated conductors; striated stabilizer;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2012.2232337
