Abstract
Oxidized Hastelloy X (Hx) fiber braid has been demonstrated to work well as a good electric insulation of Ag‐sheathed Bi2Sr2CaCu2O8 (Ag/Bi2212) wires. In order to develop a wind‐and‐react processed Ag/Bi2212 superconducting magnet with a high coil current density, we fabricated a test coil employing 45 m long Ag/Bi2212 square shape wire with 50 μm Hx fiber braid. A test coil, whose size is 73 mm outer diameter, 64.5 mm inner diameter, and 74 mm coil winding height, consisted of 4 layers and 210 turns, and was heat‐treated at around 890 °C in oxygen gas. The critical current Ic of the test coil was 245 A at 4.2 K in a self‐field, corresponding to a 67% value of the short sample Ic heat‐treated at the same time for comparison. Coil inductance was calculated to be 1.9 mH, and as a result, the same inductance value was obtained in the test coil. It was found that a Hx cloth knitting method enables us to insulate sufficiently between wires in Ag/Bi2212 square shape wire.
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