Superconducting wire joint

Abstract

The invention provides a superconducting wire joint which comprises a support tube, a superconductive filament cluster of a superconducting wire to be connected, a copper pipe and superconductive solder. An external cylindrical surface of the support tube is provided with a spiral groove, and both the external cylindrical surface and the groove are provided with through holes along a radial direction. After the superconductive filament cluster of the superconducting wire to be connected is twisted round the spiral groove of the support tube, the support tube which is twisted with the superconductive filament cluster is integrally inserted into the copper pipe with a segment of the superconducting wire, and other space in the copper pipe is filled with the superconductive solder. Material purity of the copper pipe is 99.999%, and in an annealing state, the support tube is NbTi superconductive alloy material. Components of the superconductive solder are Bi, Pb and Sn with the following mass ratio by weight: 53%-55% of Bi, 36% of Pb and allowance of Sn. The superconducting wire joint prepared by the invention has the advantages of low resistivity, simple preparation process, small damage and threat to superconducting wire performance and suitability for project field practical operation.

Description

Technical field

[0001] The invention relates to a superconducting wire joint, in particular to a superconducting wire joint prepared by using superconducting solder. Background technique

[0002] In the development of superconducting magnets with complex electromagnetic structures and high-precision characteristics, due to the limitation of the length of a single superconducting wire supplied by commercial or the need of the magnet winding process, superconductivity is often carried out between the superconducting wires of each coil in the magnet. The quality of the joints between these superconducting wires will directly affect the stable operation of the superconducting magnet system. Similarly, when manufacturing a superconducting magnet system composed of multiple superconducting magnets, if it is required to connect each magnet in series and be powered by a single power source, it is also necessary to connect the ends of each magnet in series. Compared with the independent ...

Examples

Embodiment 1

[0037] Prepare NbTi / Cu superconducting wire joints. The superconducting wires to be connected are two NbTi / Cu superconducting wires of the same specification, the cross-section of the superconducting wire is round, the wire diameter is 0.65mm, the copper superconductivity is 2, the average wire diameter of the superconducting wire is 13μm, the number of wires is 830, and the minimum residual resistivity 100. The preparation method of the superconducting wire joint adopting the present invention is as follows: firstly, the insulating layer outside the superconducting wire to be connected is removed; the superconducting wire is immersed in the precursor solder melt until the pure copper or copper at the end of the superconducting wire is removed. The alloy matrix materials are all corroded, exposing scattered superconducting wire clusters; the components of the precursor solder are Sn and Pb, and the mass ratio of each component is Sn: 85%, and the balance is Pb; The guide wire ...

Embodiment 2

[0041] In the preparation of Nb 3 In the process of Sn superconducting coil, NbTi / CuNi superconducting wire and Nb 3 Sn / Cu superconducting wire connector. Among them, NbTi / CuNi superconducting wire is used for superconducting switch, and Nb 3 Sn / Cu superconducting wire is Nb 3 Wire for Sn superconducting coil. Nb 3 The Sn superconducting magnet is connected to the superconducting switch through a superconducting wire connector to realize closed-loop operation.

[0042] During the preparation of the superconducting wire joint, the superconducting wires to be connected are two superconducting wires of different specifications. Among them, the cross-section of the NbTi / CuNi superconducting wire is circular, the wire diameter is 0.50mm, the copper ratio is 1.35, the number of superconducting wires is 54, the minimum residual resistivity is 70, and the base material is CuNi alloy. Nb 3 The specifications of Sn / Cu superconducting wire are: circular cross section, wire diameter 0.90mm,...

Embodiment 3

[0045] The joint of NbTi / CuNi superconducting wire and NbTi / Cu superconducting wire is prepared, and the superconducting wires to be connected are two superconducting wires of different specifications. Among them, the cross-section of the NbTi / CuNi superconducting wire is circular, the wire diameter is 0.50mm, the copper ratio is 1.35, the number of superconducting wires is 54, the minimum residual resistivity is 70, and the base material is CuNi alloy. The cross-section of the NbTi / Cu superconducting wire is circular, the wire diameter is 0.85mm, the copper ratio is 1.3, the number of superconducting wires is 54, the minimum residual resistivity is 70, and the base material is pure Cu. The preparation method of the superconducting wire joint adopting the present invention is as follows: first remove the formvar material insulating layer outside the NbTi / CuNi superconducting wire and the NbTi / Cu superconducting wire; then immerse the superconducting wire to be connected into the...

Technical field

[0001] The invention relates to a superconducting wire joint, in particular to a superconducting wire joint prepared by using superconducting solder. Background technique

[0002] In the development of superconducting magnets with complex electromagnetic structures and high-precision characteristics, due to the limitation of the length of a single superconducting wire supplied by commercial or the need of the magnet winding process, superconductivity is often carried out between the superconducting wires of each coil in the magnet. The quality of the joints between these superconducting wires will directly affect the stable operation of the superconducting magnet system. Similarly, when manufacturing a superconducting magnet system composed of multiple superconducting magnets, if it is required to connect each magnet in series and be powered by a single power source, it is also necessary to connect the ends of each magnet in series. Compared with the independent ...

Examples

Embodiment 1

[0037] Prepare NbTi / Cu superconducting wire joints. The superconducting wires to be connected are two NbTi / Cu superconducting wires of the same specification, the cross-section of the superconducting wire is round, the wire diameter is 0.65mm, the copper superconductivity is 2, the average wire diameter of the superconducting wire is 13μm, the number of wires is 830, and the minimum residual resistivity 100. The preparation method of the superconducting wire joint adopting the present invention is as follows: firstly, the insulating layer outside the superconducting wire to be connected is removed; the superconducting wire is immersed in the precursor solder melt until the pure copper or copper at the end of the superconducting wire is removed. The alloy matrix materials are all corroded, exposing scattered superconducting wire clusters; the components of the precursor solder are Sn and Pb, and the mass ratio of each component is Sn: 85%, and the balance is Pb; The guide wire ...

Embodiment 2

[0041] In the preparation of Nb 3 In the process of Sn superconducting coil, NbTi / CuNi superconducting wire and Nb 3 Sn / Cu superconducting wire connector. Among them, NbTi / CuNi superconducting wire is used for superconducting switch, and Nb 3 Sn / Cu superconducting wire is Nb 3 Wire for Sn superconducting coil. Nb 3 The Sn superconducting magnet is connected to the superconducting switch through a superconducting wire connector to realize closed-loop operation.

[0042] During the preparation of the superconducting wire joint, the superconducting wires to be connected are two superconducting wires of different specifications. Among them, the cross-section of the NbTi / CuNi superconducting wire is circular, the wire diameter is 0.50mm, the copper ratio is 1.35, the number of superconducting wires is 54, the minimum residual resistivity is 70, and the base material is CuNi alloy. Nb 3 The specifications of Sn / Cu superconducting wire are: circular cross section, wire diameter 0.90mm,...

Embodiment 3

[0045] The joint of NbTi / CuNi superconducting wire and NbTi / Cu superconducting wire is prepared, and the superconducting wires to be connected are two superconducting wires of different specifications. Among them, the cross-section of the NbTi / CuNi superconducting wire is circular, the wire diameter is 0.50mm, the copper ratio is 1.35, the number of superconducting wires is 54, the minimum residual resistivity is 70, and the base material is CuNi alloy. The cross-section of the NbTi / Cu superconducting wire is circular, the wire diameter is 0.85mm, the copper ratio is 1.3, the number of superconducting wires is 54, the minimum residual resistivity is 70, and the base material is pure Cu. The preparation method of the superconducting wire joint adopting the present invention is as follows: first remove the formvar material insulating layer outside the NbTi / CuNi superconducting wire and the NbTi / Cu superconducting wire; then immerse the superconducting wire to be connected into the...

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