1992 年 27 巻 1 号 p. 70-76
The authors have been studying the fabrication conditions of long silver-sheathed Tl-series oxide superconducting wires. A multi-layered pancake coil was fabricated by piling 12 single pancake coils wound with the 17.5m long tape shaped wires. It was confirmed by the criterion of 10-13Ωm that the multi-layered pancake coil was superconducting on the whole length. This multi-layered coil generated a maximum magnetic field of 510G at 77K and 1, 410G at 4.2K, respectively. The Jc of this coil was restricted by the local Jc properties of the tape where the maximum self-magnetic field of the coil was induced.