Finite element analysis of AC loss in non-twisted Bi-2223 tape carrying ACtransport current and/or exposed to DC or AC external magnetic field

AC losses in Bi-2223 superconducting tapes carrying AC transport current an d/or exposed to DC or AC magnetic field are calculated with a numerical mod el based on the finite element method. Superconducting property is given by the E-J characteristic represented by a power law using equivalent conduct ivity. First, transport loss and magnetization loss are calculated numerica lly and compared with measured values. The calculated losses almost agree w ith the measured losses. Frequency dependencies of calculated and measured transport losses are compared with each other. Next, the influence of DC ex ternal magnetic field on the transport loss is studied. DC external magneti c field reduces pI that is an exponent in the power law connecting resistiv ity and current density. Tne numerically calculated transport loss increase s with increasing DC magnetic field. Finally, the total loss of superconduc ting tape carrying AC transport current in AC magnetic field is calculated. in the perpendicular magnetic field, the calculated total loss is lager th an the sum of the transport loss and the magnetization loss, while they alm ost agree with each other in the parallel magnetic field. (C) 1998 Elsevier Science B.V. All rights reserved.