60 Hz losses, measured at 4.2 K, are reported for a number of VjGa tapes reacted between 625°C and 775°C for various lengths of time. The losses are shown to depend mainly on the bulk critical current density Jc, except at low fields (~ 500 Oe) where surface currents, and hence surface roughness, pl
AC losses in multilayer superconducting tapes
✍ Scribed by L. Cesnak; F. Gömöry; J. Kokavec; S. Takàcs
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 896 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
ac losses have been investigated experimentally as we# as theoretically in tapes having on the surface several normal conducting and/or superconducting layers. The superconducting layers under investigation have been Nb3Sn on a niobium substrate and Nb3Ge on a stainless steel substrate. It has been proved that the layered structure of the tapes is well reflected by the stepwise character of the ac losses dependence on the amplitude of the surface magnetic field. The magnetic flux passing through a surperconducdng layer or surface barrier into the inside of the tape enhances the losses in the passed barrier or layer.
📜 SIMILAR VOLUMES
Ac-loss and time constant measurements were performed with Bi-2223 tape conductors in Ag matrix at 4.2 K and at 77 K. The frequency dependence of the loss curve shows the expected maximum at xs ¼ 1. In some cases the loss curve goes through a minimum in the higher frequency range and then increases
The critical current density (J c ) in the YBCO superconducting layer in the typical coated conductor is known to be not uniform along a lateral direction of its cross section. Non-uniformity of J c values in a superconducting layer is the dominant factors of the AC loss characteristics together wit