JPH097820A - Toroidal superconductive magnet device - Google Patents

Abstract

PURPOSE: To cut down the thermal loss by a method wherein a helium vessel is provided inside a center pole so as to feed and recover the helium between a herium cooling system and respective cyrostats by relaying the helium vessel provided inside the central pole. CONSTITUTION: The liquid helium liquefied by a helium cooking system 4 is fed to a helium vessel 15 inside a center pole 11 through a helium feeding line 16. Next, the liquid helium is fed to respective cryostats 12 through a liquid helium connecting line 18 communicating with the lower parts of respective cyrostats 12 so as to cool down the superconductive coils 2 inside respective cyrostats 12. Finally, the gaseous helium inside respective cyrostats 12 are collected in the vessel 15 inside the center pole 11 through a cyrostat 12 and a gaseous helium connecting line 19 communicating with the upper part to be recovered into the cooling system 4 through one helium recovery line 17 for liquefaction again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroid type superconducting magnet device.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional toroid type superconducting magnet apparatus is provided with a center pole 1 standing upright in the central portion of the apparatus and a toroid type outside the center pole 1. Multiple superconducting coils 2,
2, ..., These superconducting coils 2 are housed and radially supported on the outer periphery of the center pole 1,
A cryostat 3 for maintaining the liquid helium temperature at
It is composed of a helium cooling device 4.

The cryostat 3 includes a vacuum container 5
And a helium container 6, of which the superconducting coil 2 is housed in the inner helium container 6. Generally, a small toroid type superconducting magnet device has a plurality of superconducting coils 2 housed in one cryostat 3. However, in the case of a large toroid type superconducting magnet device, the amount of expensive liquid helium must be reduced. In order to prevent induction of quenching of another healthy superconducting coil during quenching of one superconducting coil 2 (transfer of normal conduction), the superconducting coils 2 are individually housed in each cryostat 3.

Liquid helium 7 for cooling the coil from the helium cooling device 4 is sent to each helium container 6 through a helium supply line 8 and cools the superconducting coil 2. At this time, the liquid helium 7 in the helium container 6 is vaporized by the heat generation of the superconducting coil 2 and becomes helium gas. This helium gas is recovered again by the helium cooling device 6 through the helium recovery line 9, and is liquefied by cooling here.

Further, in the toroidal superconducting magnet device, electromagnetic forces such as centripetal force, hoop force, and tipping force act, so from the viewpoint of avoiding various problems due to this electromagnetic force, each cryostat 3 is installed in the center hall 1 or the like. It is supported.

Incidentally, FIG. 5 shows a buckling cylinder system for radially supporting the cryostats 3 in the center hole 1, and FIG. 6 shows a wedge system for connecting the cryostats 3 to each other. Support structure for supporting centripetal force and supporting between superconducting coils 1
It is configured to support the fall force by 0.

[0007]

By the way, in the above-described toroid type superconducting magnet device, the helium cooling device 4 individually supplies the helium supply line 8 and the helium recovery line 9 to the respective cryostats 2 ,.
Is provided, the heat loss is large and the piping has a complicated configuration. Further, since the liquid helium 7 is supplied to each cryostat 3 through the individual helium supply line 8, it is necessary to control the liquid level for each cryostat 3, which also complicates the liquid level control configuration of the entire apparatus. There is a problem.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a more reliable toroid type superconducting magnet device with a reduced thermal loss, a compact and simple structure. And Another object of the present invention is to provide a toroid type superconducting magnet device that can easily uniformize the liquid level of all cryostats.

[0009]

In order to solve the above-mentioned problems, the inventions corresponding to claims 1, 2 and 4 support a cryostat for individually accommodating a plurality of toroidal superconducting coils on a center pole. With the above, in a toroid type superconducting magnet device that supplies liquid helium from the helium cooling device to each of the cryostats to cool the superconducting coil, a helium container is provided inside the center pole, and the helium cooling device and each of the cryostats This is a toroidal superconducting magnet device for supplying and recovering helium between them by relaying a helium container provided inside the center pole.

The helium container inside the center pole and the respective cryostats connect the lower and upper parts of the helium container and the respective cryostats, and the center pole and the respective cryostats are connected by a key structure. To do.

Next, in claims 3 and 4, a cryostat for individually accommodating a plurality of toroidal-shaped superconducting coils is supported on the center pole, and
In a toroidal superconducting magnet device that cools the superconducting coil using helium, a call box provided inside a center pole, a helium compressor that delivers compressed helium and supplies the call box inside the center pole, and A toroid type superconducting magnet device provided with coil cooling means for directly cooling the superconducting coil by guiding cold heat generated by a call box to each of the cryostats. In addition, the center pole and each cryostat are connected by a key structure.

[0012]

Therefore, the inventions corresponding to claims 1, 2 and 4 are
By taking the above measures, the supply and recovery of helium between the helium cooling device and many cryostats is performed by relaying the helium container in the center pole. One helium supply line and one helium recovery line with the helium container can reduce thermal loss, and the supply / recovery line has a very simple structure.

Further, since the helium container and each cryostat inside the center pole connect the lower and upper parts of the helium container and the respective cryostats, liquid helium from the helium container is supplied to each cryostat through the lower part. Then, the liquid level of each cryostat is automatically made uniform.

Further, by connecting the center pole and each cryostat in a key structure form, the overturning force due to the electromagnetic force of each superconducting coil can be reliably prevented. next,
The invention corresponding to claims and 4 is the same as the invention corresponding to claim 1, because the compressed helium from the helium compressor is cooled in the call box in the center pole to directly cool the superconducting coils of each cryostat. In addition, thermal loss can be reduced, and the supply / recovery line can have a simple structure. Moreover, the center pole and each cryostat can be securely connected to each other by a key structure to prevent the overturning force due to the electromagnetic force of each superconducting coil.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing an embodiment of a toroid type superconducting magnet device. In the figure, the same parts as those in FIGS.

This superconducting magnet device is provided with a center pole 11 erected in the central portion of the device and a plurality of superconducting coils 2 arranged outside the center pole 11.
2, ..., Each superconducting coil 2 is individually housed and radially supported on the outer periphery of the center pole 11, and the cryostat 1 holds the superconducting coil 2 at the liquid helium temperature.
2 and a helium cooling device 4.

This cryostat 12 is a vacuum container 1.
3 and a helium container 14 of which the superconducting coil 2 is housed in the helium container 14. As the center pole 11, a cylindrical portion is formed in the inner vertical direction, and a helium container 15 is installed inside the cylindrical portion. Further, one helium supply line 16 is connected to the helium cooling device 4, and the tip end of this supply line 16 extends to the vicinity of the bottom inside the helium container 15. Further, one helium recovery line 17 is connected to the helium cooling device 4 from the upper part inside the helium container 15.

Further, the lower part of the helium container 15 inside the center pole and the lower part of each cryostat 12, ... Are connected by a liquid helium connecting line 18, and the liquid helium 7 in the helium container 15 is transferred to the helium container 14 of each cryostat 12. It is configured to supply.

Further, a gas helium connecting line 19 for taking in gas helium vaporized by each cryostat 12 is connected between the upper part of the helium container 15 inside the center pole and the upper part of each cryostat 12.

Therefore, according to the configuration of the above embodiment, the liquid helium 7 liquefied and cooled by the helium cooling device 4 passes through one helium supply line 16 and enters the helium container 15 inside the center pole 11. Supplied. The liquid helium 7 in the helium container 15 is sent to each cryostat 12, ... Through a liquid helium connection line 18 that communicates with the lower part of each helium container 15 to the lower part of each cryostat 12 ,. Cool 2.

Inside each of these cryostats 12, ..., Liquid helium 7 is vaporized by the heat generation of each superconducting coil 2 to become gas helium. The gas helium in each of the cryostats 12, ... Is the gas helium connection line 1 communicating with the upper portion of the cryostats 12 ,.
After being collected in the helium container 15 in the center pole through 9, ..., It is recovered in the helium cooling device 4 through one helium recovery line 17, and is liquefied again here.

In this device, the helium cooling device 4
The helium container 15 is provided in the center pole located between the cryostat 12 and each cryostat 12, and the helium container 15 is relayed to connect the helium cooling device 4 to each cryostat 12 ,. The liquid helium 7 can be supplied and the gas helium can be recovered by using the helium supply line 16 and the helium recovery line 17 of the above, and a very simple supply line and recovery line can be constructed. It can be significantly reduced.

Further, since the lower part and the upper part of the helium container 15 inside the center pole 11 and the helium container 143 accommodating the individual superconducting coils 2 are connected by the liquid helium connection line 18 and the gas helium connection line 19, respectively. The liquid level of liquid helium in each cryostat 12, ... Can be made the same without performing special control. (Second Embodiment) FIG. 2 is a structural diagram showing another embodiment of the toroid type superconducting magnet device. In FIG.
The same parts as those in FIGS. 4 to 6 are designated by the same reference numerals for description.

This device accommodates a center pole 11 which is erected in the central part of the device, a plurality of superconducting coils 2, 2 arranged outside the center pole 11, and each superconducting coil 2 individually. And a helium compressor 2, which is radially supported on the outer circumference of the center pole 11 and holds the superconducting coil 2 at a helium temperature.
1 and are provided.

A cold box 22 is provided inside the center pole 11.
A transfer tube 23 is connected between the helium compressor 21 and the helium compressor 21. Further, a cold heat supply line 24 is individually connected from the cold box 22 to each of the cryostats 12 ,.

Therefore, according to the configuration of this embodiment, the compressed helium from the helium compressor 21 is guided to the cold box 22 through the transfer tube 23.
The cold heat generated in the cold box 22 is sent to each of the cryostats 12, ... And directly cools each of the superconducting coils 2.

Therefore, even in the configuration of this embodiment, 1
The superconducting coils 2, ... Of the respective cryostats 12, ... Can be cooled by using the transfer tube 23 of the book, the thermal loss can be considerably reduced as in the above-mentioned embodiment, and the line can be simplified as is clear from the figure. it can.

Next, FIG. 3 is a view showing an example of a supporting structure of the cryostat 12 for accommodating the superconducting coil 2 with respect to the center pole 11. This support structure is provided, for example, on the outer circumferential portion of the center pole 11 at the convex portions 11a at predetermined intervals.
On the other hand, on the other hand, the recess 12a is formed on the side of the cryostat 12 facing the center pole.
If the convex portion 11a is connected to the concave portion 12a of the cryostat 12 by a key structure, the falling force due to the electromagnetic force of the superconducting coil 2 can be reliably prevented.

In particular, SMES (superconducting energy storage)
In the toroidal type superconducting magnet device used in the device, if the superconducting coil 2 is arranged so as to have symmetry with respect to the electromagnetic force, the key structure support supports the falling force unless a large falling force basically works. it can.

The shape of the key structure may be reversed. In other words, the recess on the center pole 11 side, the cryostat 1
A convex portion may be formed on the second side, or a key structure type having a wedge shape may be used.

[0031]

As described above, according to the present invention, the following various effects are exhibited. In the invention of claim 1, since one helium supply line and one recovery line are connected between the helium cooling device and the multiple cryostats that house the superconducting coils, respectively, the helium is supplied and recovered. The reliability can be further improved by using a simple line configuration that can be significantly reduced.

According to the second aspect of the invention, the liquid level of helium in each cryostat can be made uniform without performing complicated control. Next, in the invention of claim 3, since the compressed helium from the helium compressor is cold-heated in the cold box in the center pole, and then helium is supplied to each cryostat, thermal loss is further increased as compared with claim 1. It is possible to reduce the number, simplify the line configuration, and improve the reliability.

Further, in the invention of claim 4, the center pole and the respective cryostats are connected by the key structure, whereby the overturning force due to the electromagnetic force of the superconducting coil can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a toroid type superconducting magnet device according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the toroidal superconducting magnet device according to the present invention.

FIG. 3 is a view showing an example of a support structure of each cryostat with respect to a center pole.

FIG. 4 is a cross-sectional view showing a configuration of a conventional toroid type superconducting magnet device.

FIG. 5 is a view showing a conventional support structure for each cryostat with respect to a center pole.

FIG. 6 is a view showing a conventional support structure of each cryostat for a center pole.

[Explanation of symbols]

2 ... Superconducting coil, 7 ... Liquid helium, 4 ... Helium cooling device, 11 ... Center pole, 12 ... Cryostat, 15 ... Helium container, 16 ... Helium supply line,
17 ... Helium recovery line, 18 ... Liquid helium connection line, 19 ... Gas helium connection line, 21 ... Helium compressor, 22 ... Cold box, 24 ... Cold heat supply line.

Claims (4)

[Claims] 1. A toroidal superconducting system in which a cryostat for individually housing a plurality of superconducting coils arranged in a toroidal type is supported on a center pole, and liquid helium is supplied from a helium cooling device to each of the cryostats to cool the superconducting coils. In the magnet device, a helium container is provided inside the center pole, and supply and recovery of helium between the helium cooling device and each of the cryostats are performed by relaying the helium container provided inside the center pole. Characterized toroid type superconducting magnet device. 2. The toroidal superconducting magnet device according to claim 1, wherein the helium container and the respective cryostats inside the center pole connect the lower and upper parts of the helium container and the respective cryostats. 3. A toroid type superconducting magnet device for supporting a cryostat for individually accommodating a plurality of superconducting coils arranged in a toroid type on a center pole, and cooling the superconducting coil using helium, wherein: A provided call box, a helium compressor that sends out compressed helium and supplies it to the call box inside the center pole, and guides the cold heat generated by the call box to each of the cryostats to directly cool the superconducting coil. A toroidal type superconducting magnet device comprising a coil cooling means. 4. The toroidal superconducting magnet device according to claim 1, wherein the center pole and each cryostat are connected by a key structure.