Magnetization loss of YBCO coated conductors and BSCCO multifilamentary tapes

Abstract

The determination of an analytical method for alternating current (ac) loss prediction is important for the design of electrical apparatus using high-Tc superconducting tapes. Brandt and Indenbom have analytically described the magnetization loss of infinitely thin strips in a perpendicular transverse magnetic field based on the Bean critical state model using their formula. Banno and co-workers have proposed an analytical formula for the magnetization loss of untwisted or twisted-but-coupled BSCCO multifilamentary tapes. The tapes have a relatively small aspect ratio in a transverse magnetic field with an arbitrary field orientation where the power law E-J characteristic and the strong magnetic field dependence of Jc and n value are taken into account. These authors applied these two analytical formulae to measurements of magnetization loss in a transverse external magnetic field in various directions without transport current in a YBCO coated conductor and a BSCCO untwisted multifilamentary tape. The analytical formula of Brandt and Indenbom, which uses a perpendicular transverse magnetic component, agrees well with the magnetization losses in the YBCO coated conductor in a transverse magnetic field with various orientations. The analytical formula of Banno and co-workers roughly agrees with the magnetization loss in the BSCCO untwisted multifilamentary tape above the penetration magnetic field.