Dependences of AC Loss in Stacked REBa2Cu3O y Superconducting Tapes on the Interval among Tapes under Perpendicular Magnetic Field

• Published in: Journal of physics. Conference series 2019-09, Vol.1293 (1)
• Main Authors: Sasa, H, Kawasaki, G, Miura, S, Iwakuma, I, Izumi, T, Machi, T, Ibi, A
• Format: Article
• Language: English
• Subjects: Coils; Gadolinium; Magnetic fields; Physics; Superconducting tapes; Superconductivity
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1293/1/012037

In this study, we focused on the dependence of the AC loss in REBa2Cu3O y (REBCO, RE = rare earth, Y, Eu, Gd) superconducting tapes stacked perpendicular to the tape face on the interval between the superconducting layers. The AC loss of the 2-layer stacked tapes with various interval in perpendicular field was investigated by pickup-coil method. The AC loss for external applied magnetic field, B m, below the penetration field, B p, increases with increasing the interval. In the case that the ratio of the distance between the neighboring superconducting layer, D, to the width of the tape, w, (D/w) is smaller than 0.1, the AC loss of 2-layer tapes decreased to 1/2 of that of 1-layer tape. On the other hand, in the case of D/w being larger than 0.1, the AC loss of 2-layer tapes was larger than 1/2 and it approached the AC loss of 1-layer tape with increasing D/w. From the result obtained in this study, it is predicted that, for B m below B p, the AC loss of stacked REBCO tapes with large D/w, such as multifilamentary tapes, is larger than the AC loss of stacked non-scribed REBCO tapes. However, for B m above B p: a large AC loss region, it is known that the AC loss of the multifilamentary tapes decreases compared with that of non-scribed tapes. Next step, AC loss of the multifilamentary tapes for B m below B p will be investigated experimentally and theoretically.