| 摘要 |
A combined superconducting coil comprising a coil winding formed by an alloy type composite superconducting wire for generating a strong magnetic field exceeding a critical value in at least one part of the respective turns of the coil winding when an exciting current is applied to the coil winding, a plurality of partial by-pass wires formed by a compound type composite superconducting wire and arranged along and in contact with the coil winding so that the partial by-pass wires form by-passes for the exciting current along portions of the coil winding where the strong magnetic field exceeds the critical value, and a plurality of flow passages for circulating extremely low temperature helium between the respective turns of the coil winding so that the helium is in direct contact with at least one of the coil winding and the partial by-pass wires. The length of each partial by-pass wire is so selected that both ends thereof extend beyond said portion of the coil winding. The superconducting material of the partial by-pass wire has such a high critical magnetic field as maintaining superconductivity even in the excessively strong magnetic field. The combined superconducting coil according to this invention has a high effective working magnetic field and can be easily manufactured by combining alloy type composite superconducting wire with compound type composite superconducting wire.
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