JPS6239802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting coil, and particularly to a superconducting coil formed by winding a compound superconducting wire and an alloy superconducting wire.

As an application of superconductivity, superconducting coils for generating high magnetic fields for physical experiments, etc. are well known and are in practical use, but in recent years the strength of the generated magnetic field required of these superconducting coils has been increasing, and the magnetic field Those with a strength of more than 10 terraces are increasing. The superconducting materials used in this superconducting coil include general alloys such as Nb, Zr, and Ti, and intermetallic compounds such as Nb ₃ Sn. Among these materials, intermetallic compound materials have higher critical temperature, critical magnetic field, and critical current density, which are the basic properties of superconducting materials, than alloy materials, but they are difficult to process compared to alloy materials. and the price is high.
Therefore, alloy materials are advantageous for superconducting coils where the generated magnetic field strength is 7 terraces or less, and intermetallic compound materials are advantageous when the generated magnetic field strength is 10 terraces.

By the way, the strength of the magnetic field generated by the superconducting coil for generating a high magnetic field becomes larger toward the inner diameter side compared to the outer diameter side of the superconducting coil. On the other hand, the value of critical current density, which is one of the characteristics of superconducting materials, depends on the strength of the magnetic field. For this reason, conventionally, as shown in Fig. 1, a compound-based superconducting coil 2 in which a compound-based superconducting wire, which is an intermetallic compound-based superconducting material, is wound around a bobbin 1 on the inner diameter side, and a compound-based superconducting coil 2, A superconducting coil 4 was formed by an alloy-based superconducting coil 3 in which an alloy-based superconducting wire, which is an alloy-based superconducting material, was wound around the outer diameter side of the superconducting coil 2. However, in such a superconducting coil 4, the tension of the alloy superconducting wire wound on the outer diameter side depends on the tension of the compound superconducting wire wound on the inner diameter side, so the overall It was not tightly wound but loosely wound. Therefore, during energization, a portion of these wound superconducting wires moves locally, causing local heating and eliminating the predetermined superconducting state. In other words, there was a concern that superconducting destruction would occur.

The present invention has been made in view of the above points,
The purpose is to provide a superconducting coil that is less prone to superconducting breakdown.

That is, the present invention provides a compound-based superconducting coil in which a compound-based superconducting wire is wound around a first bobbin, and an alloy-based superconducting wire arranged in combination on the outer diameter side of the first bobbin, and an alloy-based superconducting wire in a second bobbin. and an alloy-based superconducting coil formed by winding the coil.

The present invention will be explained below based on the illustrated embodiments. FIG. 2 shows an embodiment of the invention. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the first bobbin 5
A compound superconducting coil 6 formed by winding a compound superconducting wire on the first bobbin 5 is combined and arranged on the outer diameter side of the compound superconducting coil 6 formed by winding the compound superconducting wire on the second bobbin 7. A superconducting coil 9 was constructed with an alloy superconducting coil 8 formed by winding an alloy superconducting wire. That is, the compound-based superconducting wire and the alloy-based superconducting wire are respectively placed in the first bobbin 5,
The wire wound on the second bobbin 7 was combined with the wire wound on the alloy superconducting wire on the outer diameter side.
In this way, the first bobbin 5 and the second bobbin 7 are
As a result, each superconducting wire can be wound tightly with the maximum allowable tension, and the superconducting wire can be wound on the inner diameter side as before. No longer affected by compound superconducting wires. Therefore, a tightly wound superconducting coil 9 is obtained, and the wound superconducting wire does not become loose even during energization, making it difficult for superconductor breakdown to occur.

As described above, in the present invention, the compound-based superconducting wire and the alloy-based superconducting wire are wound around the first and second bobbins, respectively, and the wound alloy-based superconducting wire is placed on the outer diameter side. Since the coil is wound tightly, no loosening occurs even during energization, and superconducting breakdown is less likely to occur, making it possible to obtain a superconducting coil in which superconducting breakdown is less likely to occur.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional superconducting coil, Figure 2
The figure is a longitudinal cross-sectional view of one embodiment of the superconducting coil of the present invention. 5... First bobbin, 6... Compound superconducting coil, 7... Second bobbin, 8... Alloy superconducting coil.

Claims (1)

[Claims] 1 A compound-based superconducting coil formed by winding a compound-based superconducting wire around a first bobbin, and a compound-based superconducting coil arranged in combination on the outer diameter side of this first bobbin, and forming an alloy-based superconducting wire wound around a second bobbin. A superconducting coil comprising: a superconducting alloy-based superconducting coil;