A method to reduce magnetization losses in assembled conductors made of YBCO coated conductors

A method is proposed to reduce AC magnetization losses in YBCO tape-shaped coated conductors subject to external AC magnetic fields. To reduce the magnetization losses, it is well known that the YBCO film should be subdivided into multiple filaments. In this multifilamentary conductor, the electromagnetic coupling between the filaments should be suppressed to reduce the AC losses by twisting the conductor somehow. The proposed method is that a YBCO layer on a substrate of a coated conductor is subdivided into multiple filaments by slanted striations and that a quasi-twisted assembled conductor is composed by soldering a pair of those striated tapes. The effect of the twisting is obtained by this composition without twisting the conductor itself. A numerical simulation showed that magnetization losses in a quasi-twisted conductor were greatly reduced at a sacrifice of a slight increase of the transport current losses.