JPS5840803A - Superconductive device - Google Patents

Abstract

PURPOSE:To obtain a superconductive device firmly supporting superconductive wires in spool grooves and sufficiently enduring powerful electromagnetic force by a method wherein continuous grooves are provided in the circumference direction of round spools and superconductive wires surrounded by refrigerant paths through a plurality of spacers are wound in the circumference direction. CONSTITUTION:A plurality of continuous endless-shaped grooves 1a having predetermined intervals in the diameter direction are provided in the circumference direction of each spool 1 and a plurality of superconductive wires 2 are wound in the grooves 1a while supporting the superconductive wires 2 by penetrating spacers 4 provided with predetermined intervals in the circumference direction. Refrigerant paths 7 surrounding the superconductive wires 2 and flowing superconductive heliun are provided at the outside circumference of the superconductive wires 2 and stack bolts 6 are provided at the outside circumference end sections of the spools 1. In this composition, covers 3 are arranged on the upper and lower plane sections of the spools 1 and the covers 3 are fixed by welding sections 5 by an electron beam. This transfers electromagnetic force generated on the superconductive wires 2 to the spools 1 through spacers 4 and prevents the deformation of the superconductive wires 2 with the aid of the spools 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a superconducting device, and particularly to a superconducting device that is large in size and receives a large electromagnetic force, and is suitable for use as a superconducting coil employed in, for example, a nuclear fusion device.

Nuclear fusion energy is said to be an alternative energy source to coal, oil, and nuclear power, but in the I-Kamak type fusion reactor, which has a high possibility of being realized as a fusion reactor in recent years, a vacuum that confines annular plasma using a magnetic field is used. It is roughly constructed by a toroidal coil wound around a container, multiple poloidal coils that preheat the plasma in the vacuum container and control the position of the plasma, and a heating device that implants neutral particles into the plasma and heats it. ing.

In order to cause a nuclear fusion reaction, it is necessary to keep the temperature and density of plasma high. Toroidal coils that confine high-temperature, high-density plasma require a high magnetic field and large size, and superconductivity is inevitable in terms of electrical loss.

However, conventional superconducting coils generally use an immersion cooling method in which the entire coil is immersed in liquid helium, but as coils have recently become larger, forced circulation of supercritical helium or superfluid helium has been developed to cool the coil. Forced circulation methods that effectively remove heat loads are showing promise. In this case, the superconductor is generally formed by arranging handles and stranded wires of superconducting wires in a conduit made of SUS, and supercritical heliuno is completely flowed and cooled in the space between the superconducting wires in the conduit. However, when used in high-current, high-field superconducting coils, as the cross-section of the conductor becomes larger, there are problems such as bending of the conduit during winding and deterioration of distortion of the superconducting wire. There were some disadvantages that made it unsuitable for use in superconducting coils.

The present invention has been made in view of the above-mentioned points, and its purpose is to be able to firmly support superconducting wires even when using a forced circulation cooling method, and to provide a powerful It is an object of the present invention to provide a superconducting device that can not only withstand electromagnetic force but also provide a stable superconducting coil.

The present invention provides a substantially circular winding frame having a groove continuously provided in the circumferential direction, a superconducting wire wound in the groove of the winding frame, and the superconducting wire as described above. A plurality of spacers are supported at predetermined intervals in the circumferential direction in St, and a lid is provided to cover the open side of the groove in order to support and fix the spacers to the winding frame. By forming a refrigerant passage through which a refrigerant for line cooling passes, the object is achieved.

Hereinafter, the present invention will be described in detail based on embodiments of the drawings.

FIG. 1 shows an embodiment of the present invention. This figure (d) is a schematic diagram of a superconducting device called a double pancake.

In the figure, 1 is continuous in the circumferential direction and is endless, and
A plurality of winding frames are provided at predetermined intervals in the radial direction and have grooves 1a formed in parallel with each other, and a superconducting wire 2 is wound inside each winding frame 1. The superconducting wire 2 is supported in each groove la by a plurality of spacers IW arranged at predetermined intervals in the circumferential direction. Thereafter, a lid 3 is provided to cover the open side of the matching groove 1a, and this lid 3 is fixed to the winding frame 1 by welding 5 continuously applied in the circumferential direction, thereby keeping each groove 1a6 airtight. A coolant flow path 7 through which superconducting helium for cooling the superconducting wire 2 flows is formed in the groove la. When welding the lid 3 to the winding frame 1, electron beam welding (EBW) is used to keep the joint groove 1a airtight, and the spacer 4 is preferably made of ceramic or the like in consideration of thermal effects and electromagnetic force during welding. Yes. Further, the distance between the spacers 4 is determined by considering the displacement of the electromagnetic force of the superconducting wire 2 and the stability of the superconducting wire 2. Note that 6 is a stack bolt hole.

By constructing the superconducting device of this embodiment as described above, the superconducting wire 2 is wound and embedded in the groove of the winding frame 1, so that the electromagnetic force generated in the conductor is transmitted to the winding frame 1 via the spacer 4. If the winding frame 1 is designed to have sufficient strength, deformation of the coil due to excitation can be suppressed to a greater extent than in conventional coils.

The generation of frictional heat due to the movement of the conductor is still cited as a cause of quenching, but since the superconducting coil of this example does not use adhesives such as resin, the generation of frictional heat due to the movement of the conductor is small. It is thermally stable. Furthermore, 10
The superconducting coil, which has an empirical magnetic field greater than Tesla, is made of a compound-based superconducting material Nb3 with good high magnetic field characteristics as the superconducting wire 2.
Sn is used, but Nb3Sn pure yield has poor strain characteristics, and the bending strain must be kept below 1%.As the conductor becomes larger, this restriction becomes stricter, and the size of the coil,
Although manufacturing may not be possible depending on the shape, according to this embodiment, the superconducting wire 2 can be wound around the winding frame 1.

After embedding, if heat treatment is performed, coils of all shapes can be manufactured. In addition, in a coil using four forced circulation frozen superconductors, it is extremely difficult to create an economical coil by changing the size of the superconducting wire according to the strength distribution of the magnetic field, that is, by grating. However, according to this embodiment, when the superconducting wire 2 is wound around the winding frame 1 and embedded, it is possible to easily perform grading by attaching... It is possible to produce a more economical coil compared to the conventional method.

In the device shown in FIG. 2, a plurality of double pancake superconducting devices as shown in FIG.

FIG. 3 shows another embodiment of the invention. A) Noshi 1 shown in the figure: Regarding a solenoid coil as a superconducting device, grooves 1a continuously provided in the circumferential direction of the winding frame 1 are provided at predetermined intervals in the axial direction. The superconducting wire 2 is wound.

The rest of the structure is exactly the same as that in FIG.

Even with this configuration, the effect is exactly the same as that shown in FIG. 1 described above.

What is shown in FIG. 4 is a solenoid-wound forced circulation refrigeration superconducting coil by arranging a plurality of the single-layer t1i lunoid coils shown in FIG. 3 in a concentric manner.

According to the superconducting device of the present invention described below-1-, a substantially circular winding frame having a groove continuously provided in the circumferential direction, a superconducting wire wound in the groove of the winding frame, and A plurality of spacers supported at a predetermined interval of one space in the circumferential direction in the superconducting wire front groove, and a lid provided to cover the open side of the groove in order to support and fix the spacers to the winding frame. In addition, a refrigerant passage is formed in the groove through which a refrigerant for cooling the superconducting wire passes. Therefore, the superconducting wire can be firmly supported within the groove of the winding frame, and it can withstand strong electromagnetic force. It is extremely effective when used in large-sized superconducting coils because it can withstand high temperatures.

[Brief explanation of drawings]

FIG. 1 is a partially cross-sectional perspective view of a double pancake as an embodiment of the superconducting device of the present invention, and FIG. 2 is a partially cross-sectional perspective view of a superconducting coil formed by laminating a plurality of double pancakes. , Fig. 3 is a perspective view showing another embodiment of the present invention, with a part of the solenoid coil cut away, and Fig. 4 shows a part of a solenoid-wound superconducting coil formed by laminating a plurality of solenoid coils concentrically. It is a perspective view cut away and shown.

Claims (1)

[Claims] 1. A substantially circular winding frame having a groove continuously provided in the circumferential direction, a superconducting wire wound within the groove of the winding frame, and a superconducting wire wound within the groove. A plurality of spacers are supported at predetermined intervals in the circumferential direction, and a lid is provided to cover the open side of the groove in order to support and fix the spacers to the winding frame. A superconducting device characterized in that a refrigerant passage is formed through which a refrigerant for use passes. 2. A patent claim characterized in that a plurality of grooves in the circumferential direction of the winding frame are provided at predetermined intervals in the radial direction, and a plurality of winding frames each having a superconducting wire wound in each of these grooves are laminated in the uniaxial direction. The superconducting device according to item 1. 3. A patent claim characterized in that a plurality of grooves in the circumferential direction of the winding frame are provided at predetermined intervals in the axial direction, and a superconducting wire is wound in each of these grooves, and a plurality of winding frames are arranged concentrically and rigidly. The superconducting device according to item 1.