Title :
AC losses in multifilamentary Bi-2223/Ag superconducting tapes
Author :
Paasi, J. ; Lahtinen, M. ; Aized, D. ; Fleshler, S. ; Snitchler, G. ; Malozemoff, A.P.
Author_Institution :
Lab. of Electr. & Magnetism, Tampere Univ. of Technol., Finland
fDate :
7/1/1996 12:00:00 AM
Abstract :
In this study we examined AC losses in a multifilamentary Bi-2223/Ag superconducting tape carrying AC transport current. The tape consisting of 85 filaments was helically wound to a single-layer coil. The losses were measured at 77 K in the frequency range from 1 Hz up to 250 Hz. Current amplitudes Ip were ranging from l=Ip /Ic=0.6 to 1.5, critical current Ic=15.4 A determined by the standard 1 μV/cm static electric field criterion. The roles of special loss components were considered: hysteresis, flux-creep, coupling and eddy current losses. Hysteresis losses due to the self-field of the AC transport current were found to dominate when l⩽1.1. Resistive losses dominated when l>1.2. In the hysteretic regime, the higher the frequency, the smaller the losses per cycle
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); eddy current losses; eddy currents; high-temperature superconductors; losses; multifilamentary superconductors; silver; strontium compounds; 1 to 250 Hz; 15.4 A; 77 K; AC losses; Bi2Sr2Ca2Cu3O10 -Ag; coupling losses; eddy current losses; flux-creep; high temperature superconductor; hysteresis; multifilamentary Bi-2223/Ag superconducting tapes; single-layer coil; Critical current; Current measurement; Electric variables measurement; Frequency measurement; Hysteresis; Loss measurement; Measurement standards; Superconducting coils; Superconducting films; Wounds;
Journal_Title :
Magnetics, IEEE Transactions on
