| 摘要 |
<p>A superconductor constructed through the steps of embedding a plurality of Nb wires (22) into a Cu-Sn alloy region (26), inserting the mass into a vanadium cylindrical wall (28), placing said latter mass into a copper pipe (32), and applying heat treatment to produce a Nb3Sn compound superconductor (24) around the Nb wire (22). A V3Sn compound is formed inside the vanadium barrier wall (28) of the said superconductor. Since, however, the V3Sn compound (30) does not indicate superconductivity at the liquefied helium temperature, A.C. loss is reduced to a negligible extent, even when impressed with pulse current or A.C. current.</p> |
