JPH06309954A - Oxide type superconductor - Google Patents

Abstract

PURPOSE:To provide an oxide superconductor free from risk of the critical current density dropping to a large extent caused by parallel arranging of the magnetic field applied to wires relative to the tape surface when a plurality of tape wires are packaged. CONSTITUTION:A plurality of silver-alloy sheath oxide superconducting tape wires 2 are laminated through five longitudinal base boards 4a, 4b, 4c, 4d, and 4e made of stainless steel having a sector-shaped section. and a plurality of such packages 21 of tape wires 2 are accommodated in a reinforcing material 3 made of FRP, for example having a channel-shaped section, and thus a superconductive conductor 1 is formed. Therein the superconductive tape wires 2 are laminated in such arrangement that the tape surface becomes parallel with the surface of base board. The edge members AB, CD of a part of the base board 4c section are approx, parallel with the direction of leak magnetic field (shown by arrorw 8) applied to the conductor 1, and the base boards 4b, 4d have a section shape approx. similar to the base board 4c, while the base boards 4a, 4e have such a section shape that one surface of each becomes parallel with one-side surfaces of the base boards 4b, 4d when these 4a. 4e are installed inside of the reinforcing material 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor obtained by assembling oxide superconducting tape wire rods.

[0002]

2. Description of the Related Art As an oxide superconducting wire, a tape wire which is compounded with a metal such as silver is known. This tape wire is a conductor that uses silver as a composite material and covers an oxide superconductor to improve the critical current density and achieve thermal stability of the conductor.

Such superconducting wires are sometimes assembled in order to increase the current capacity, and the assembled wires are impregnated and fixed with an impregnating material such as resin before use.

[0004]

The critical current density that a tape-shaped superconducting wire can flow depends on the magnitude of the magnetic field and the direction of the magnetic field. When a magnetic field perpendicular to the tape surface of the wire is applied, the critical current density is increased. May significantly decrease. Therefore, when assembling the tape wire rods, a method of fixing the tape wire rods in a state where the magnetic field direction coincides with the tape surface is required.

An object of the present invention is, when assembling a plurality of tape wire rods, a magnetic field applied to each wire rod is arranged parallel to the tape surface, and an oxide superconducting conductor in which the critical current density is not significantly lowered. Is to get.

[0006]

In order to achieve the above object, in the present invention, a substrate having a plane substantially parallel to the direction of an external magnetic field applied to a superconducting conductor in a cross section is used, and each oxide superconducting tape wire is They are arranged and fixed along the surface of the substrate.

In this case, the substrate is epoxy resin,
Made of MgO, sapphire, boron nitride, LaAl, oxide, stainless steel, silver, silver alloy, copper, copper alloy, etc.
A long material having a square or fan-shaped cross section is used.

As the oxide superconducting tape wire arranged on the basis of this substrate, a tape-shaped metal composite superconducting wire having a core of yttrium, bismuth, thallium or other oxide superconductor is used. It

[0009]

The present invention will be described below with reference to the drawings.
FIG. 1 shows an example of a current reciprocating current lead conductor 1 for exciting a superconducting coil. As shown in FIG. 2, this current lead conductor 1 is arranged and used between a superconducting coil 10 cooled by liquid helium 9 and a connection lead 11 connected to a power supply unit such as a power supply. In addition, in FIG.
2 indicates a liquid nitrogen anchor.

As shown in FIG. 1, the conductor 1 constituting the current lead has a reinforcing member 3 made of, for example, an FRP having a U-shaped cross section.
With a fan-shaped cross section, for example made of stainless steel 5
A plurality of aggregates 21 each containing a plurality of silver alloy sheath oxide superconducting tape wire rods 2 stacked on each other via a plurality of long substrates 4a, 4b, 4c, 4d and 4e are stored.
In this case, each superconducting tape wire 2 is laminated and arranged so that its tape surface is parallel to the surface of the substrate.

Here, the substrate 4c has a side A which is a part of its cross section.
B and CD are substantially parallel to the direction of the stray magnetic field applied to the conductor 1 (shown by the arrow 8), and the substrates 4b and 4d are also the substrate 4
Although the cross-sectional shape is substantially similar to that of c, the substrates 4a and 4a
e has a cross-sectional shape such that one side thereof is parallel to one side of the substrates 4b and 4d when it is incorporated into the reinforcing material 3.

Each of the substrates 4a to 4e is formed with a hole 5 penetrating in the longitudinal direction thereof so that the gas can be cooled by utilizing the enthalpy of the vaporized liquid helium 9.

The substrate 4c is provided with an electrically insulating layer 6 made of an oxide film on the surface thereof, so that the conductor 1 has a current reciprocating structure. This electrically insulating layer 6 is
Although it can be easily formed by heat-treating the substrate 4c in an oxidizing atmosphere, another electric insulator layer may be formed. In the case of this example, the substrate 4
There is no electric insulating layer in a, 4b, 4d, and 4e, and they are the electric stabilizing material of the superconducting wire tape wire rod 2.

With such a conductor structure, since each superconducting tape wire 2 is arranged parallel to the surfaces of the substrates 4a to 4e, the magnetic field component applied to the vertical surface of each superconducting tape wire 2 is reduced, and the current density is reduced. It can be used in high environment.

The heat flux of the conductor can be increased by making the surface of the substrate 4c uneven as shown by 7.

[0016]

According to the conductor of the present invention, since the magnetic field applied to the conductor is substantially parallel to the surface of the superconducting tape wire,
The superconducting conductor can be used in a high current density environment.

Further, according to the present invention, there is an advantage that the superconducting tape wire can be easily assembled by utilizing the surface of the substrate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a conductor according to the present invention.

FIG. 2 is an explanatory diagram showing an application example of a conductor according to the present invention.

[Explanation of symbols]

 1 Oxide Superconducting Conductor 2 Superconducting Tape Wire 3 Reinforcing Material 4a-4e Substrate 5 Through Hole 6 Electrical Insulating Layer 8 Magnetic Field Direction 9 Liquid Helium 10 Superconducting Coil

Claims (3)

[Claims] 1. An oxide superconducting conductor obtained by assembling a plurality of oxide superconducting tape wire rods, wherein a plurality of substrates having planes substantially parallel to an external magnetic field applied to the conductors are incorporated, and each superconducting tape wire rod is attached to the substrate. An oxide superconducting conductor, characterized in that the oxide superconducting conductors are assembled and fixed substantially parallel to the plane. 2. The oxide according to claim 1, wherein the substrate is made of stainless steel, and some of the substrates have an electrically insulating layer on the surface thereof, and the superconducting tape wire is electrically divided. Superconducting conductor. 3. The oxide superconducting conductor according to claim 1 or 2, wherein the substrate is provided with a through hole for cooling.