| 摘要 |
<p>A superconductive joint 2 comprising elongate superconductive filaments 6 and a metal matrix surrounding the superconductive filaments 5. The matrix comprises a resistive matrix (10) in a first section (11 figure 3) and a copper matrix 8 in a second section. Preferably when arranged as a switch with a superconductive coil (see figure 2) the two sections are part of a shunt 7 with current preferentially passing though the copper section allow a higher current and dI/dT than if the shunt were to substantially comprise the resistive matrix only (figure 4) A method of construction is shown in figures 6 to 9 where a resistive matrix is formed with the superconductor filament, and portions are removed to be replaced by a copper matrix. Preferably the resistive matrix is copper nickel CuNi which may be removed by nitric acid etching and dissolving in molten tin.</p> |
