LAUSR

Eddy current loss in metal stabilized layers of a high-temperature superconducting coated conductor is affected by the superconducting layer. We present ac loss measurement results on a 10-mm-wide nonstabilized Fujikura tape, on 10-mm-wide, 0.1-mm-thick copper strips, and on the Fujikura tape stacked vertically with the copper strips in a perpendicular applied field at 77 K. The applied magnetic field amplitude was varied up to 100 mT at 67.9, 87.6, and 107 Hz. The eddy current loss in the copper strips was estimated by taking the difference between the loss in the stack and the isolated Fujikura tape. The results show approximately complete shielding of perpendicular magnetic fields in samples at low magnetic field amplitude, and there is little dependence of the eddy current loss on the copper strip thickness up to 300 μm. We also present the shielding of perpendicular magnetic fields by copper strips stacked with a 30-cm-long 15/4 (15 4-mm-wide strands) Roebel cable. The shielding of perpendicular magnetic fields in the Roebel samples was observed even at high field amplitudes.