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Normalized critical current versus applied magnetic field for the tapes with non-magnetic substrate (tape S) and with magnetic substrate (tape A). Perpendicular means that the magnetic field direction is perpendicular to the tape surface. Parallel means that the magnetic field direction is parallel to the tape surface.
AC loss measurements of coil M and coil N at 77 K in liquid nitrogen bath. Estimated hysteresis loss of magnetic substrate is indicated by the straight line. Measured loss of coil M consists of HTS loss and hysteresis loss of substrate; Measured loss of coil N is solely HTS loss.
The comparison of HTS loss between measurements and calculations. On the left is coil M with magnetic substrate; the measurements are deduced by getting rid of hysteresis loss component from the measurements. On the right is coil N with non-magnetic substrate. Only HTS and substrate layers are included in the calculation by their real thickness: for HTS layer; for non-magnetic substrate; and for magnetic substrate.
Current density distribution () over a cycle: (a) a non-magnetic substrate layer and a HTS layer; (b) a magnetic substrate layer and a HTS layer; (c) two non-magnetic substrate layers sandwich a HTS layer; (d) two magnetic substrate layers sandwich a HTS layer. Critical current is set to be a constant 100 A, and applied transport current is 50 A rms and 50 Hz. The current distributions are at a quarter cycle, half cycle, three-quarter cycle, and a cycle, respectively.
Comparison of measured and calculated HTS loss when the critical currents of both coils are assumed to be 110 A constant. Hysteresis loss of substrate has been taken out from the measurement of coil M.
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