JP2001126916A - High-temperature superconducting coil and high- temperature superconducting magnet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-temperature superconducting coil where performance of high temperature superconducting wire having magnetic field direction dependency of critical current density is fully exhibited, current density is high, loss of flux flow is small, and a magnetic field which can be used is large. SOLUTION: In this high-temperature superconducting coil, pure silver matrix wire is used at a part position where a magnetic field vertical to the tape surface of a high-temperature superconduting wire 2 is large, and a silver alloy matrix wire is used at a part position where a magnetic field component parallel to the tape surface is the main component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-temperature superconducting coil used for superconducting equipment and a high-temperature superconducting magnet using the same.

[0002]

2. Description of the Related Art Superconducting coils are SMES (Super
conducting MagnetEnergy S
storage, a superconducting transformer, a current limiter, an NMR (nuclear magnetic resonance) analyzer, a single crystal pulling device, a linear motor car, a magnetic separation device, and other superconducting devices.

[0003] The high temperature superconducting coil has a higher critical temperature than the superconducting coil used at the conventional liquid helium temperature (4K). For example, bismuth-based wires can be used at liquid hydrogen temperature (20K), and yttrium-based wires can be used at liquid nitrogen temperature (77K). In addition, when cooling with a refrigerator, it has become possible to operate at a predetermined temperature below the critical temperature.

As described above, research and development of recent high-temperature superconducting coils has been remarkable, and application to practical equipment is expected.

[0005]

By the way, in a conventional superconducting coil, as shown in FIG.
The single high-temperature superconducting coil 15 is formed of a tape-shaped high-temperature superconducting wire 40 having the same superconducting characteristics.

Further, the tape-shaped high-temperature superconducting wire 40, which is widely used at present, has a strong magnetic field anisotropy with respect to the tape surface, and a critical current density with respect to stress acting on the wire 40 is greatly deteriorated. There is a need for a design method different from that of the superconducting coil.

On the other hand, in the low-temperature superconducting coil, when the liquid helium temperature (4K) is maintained, the efficiency of the refrigerator is low,
A heat radiation shield that suppresses the heat of penetration by radiation was indispensable. On the other hand, in the case of the high-temperature superconducting coil, the operating temperature of the coil is high, so that the efficiency of the refrigerator is improved. For this reason, it is possible to design to increase the utilized magnetic field even at the expense of a slight increase in heat of penetration.

In a conduction cooling type high-temperature superconducting coil cooled by a refrigerator via a heat transfer path, when the refrigerator is stopped due to a power failure or a failure, excitation can be continued for a certain period of time. In some cases, a heat reservoir is provided in a high-temperature superconducting coil. Although the temperature rise of the high-temperature superconducting coil can be suppressed low by the heat capacity of the heat reservoir, it is still higher than the normal operating temperature of the refrigerator.
For this reason, in the high-temperature superconducting coil, the flux flow loss increases, and the loss causes the temperature rise to be further accelerated, making it difficult to continuously operate for a long time.

[0009] As described above, even a high-temperature superconducting coil, which has recently attracted attention and is expected to be put to practical use, cannot sufficiently exhibit its performance as compared with a low-temperature superconducting coil. Improvements in design techniques, coil configurations, and the like are required.

The present invention has been made in view of such circumstances, and has a high current density, a small loss of flux flow, a large available magnetic field, and a long continuous operation even when the refrigerator is stopped. An object of the present invention is to provide a high-temperature superconducting coil that can be operated and a high-temperature superconducting magnet using the same.

[0011]

According to a first aspect of the present invention, there is provided a high-temperature superconducting coil according to the present invention, wherein a high-temperature superconducting wire is wound flat-wise in a plurality of coils. A high-temperature superconducting coil having a unit coil layer formed by coaxially arranging a second unit coil and a third unit coil on both sides of the first unit coil, wherein the first unit coil includes silver containing a silver alloy as a base material; And a high-temperature superconducting wire made of pure silver as a base material for the second unit coil and the third unit coil.

Further, the high-temperature superconducting coil according to the present invention comprises:
In order to achieve the above object, as described in claim 2, a second unit coil and a third unit coil are provided on both sides of the first unit coil among a plurality of coils in which a high-temperature superconducting wire is wound flatwise. In the high-temperature superconducting coil which is arranged coaxially to form a unit coil layer,
A donut-shaped spacer is inserted between the first unit coil, the second unit coil, and the third unit coil coaxially with these coils.

Further, the high-temperature superconducting coil according to the present invention comprises:
In order to achieve the above object, as described in claim 3, a second unit coil and a third unit coil are provided on both sides of the first unit coil among a plurality of coils in which a high-temperature superconducting wire is wound flatwise. In the high-temperature superconducting coil which is arranged coaxially to form a unit coil layer,
On the inner diameter side of the first unit coil, a cylindrical electromagnetic force reinforcing member is provided coaxially with the coil.

Further, the high-temperature superconducting coil according to the present invention comprises:
In order to achieve the above object, as described in claim 4, among a plurality of coils in which a high-temperature superconducting wire is wound flatwise, a second unit coil and a third unit coil are provided on both sides of the first unit coil. In the high-temperature superconducting coil which is arranged coaxially to form a unit coil layer,
The first unit coil is divided into an inner diameter side and an outer diameter side, and an intermediate portion thereof is a current density reduction portion.

Further, the high-temperature superconducting coil according to the present invention comprises:
In order to achieve the above object, as described in claim 5, a fourth unit coil and a fifth unit coil are provided on both sides of the first unit coil among a plurality of coils in which a high-temperature superconducting wire is wound flatwise. A high-temperature superconducting coil, which is coaxially arranged and has a second unit coil and a third unit coil coaxially arranged on one side of a fourth unit coil and a fifth unit coil and formed in a unit coil layer, wherein the first unit coil is Out of the fifth unit coils, at least one coil and the remaining coils are formed so that current flows in opposite directions.

Further, the high-temperature superconducting coil according to the present invention comprises:
In order to achieve the above object, as described in claim 6, a second unit coil and a third unit coil are provided on both sides of the first unit coil among a plurality of coils in which a high-temperature superconducting wire is wound flatwise. In the high-temperature superconducting coil which is arranged coaxially to form a unit coil layer,
The second unit coil and the third unit coil are divided into an inner diameter side and an outer diameter side, and an intermediate portion between them is a space current density reduction portion.

According to a seventh aspect of the present invention, there is provided a high-temperature superconducting magnet according to the present invention, wherein a heat radiation shield formed by being surrounded by a vacuum vessel provided with a refrigerator is provided. A high-temperature superconducting coil housed in a radiation shield and housed in a coil container, a heat conductor for connecting the refrigerator and the coil container to each other, and an opening formed on the magnetic field utilization side of the heat radiation shield. It is a thing.

According to another aspect of the present invention, there is provided a high-temperature superconducting magnet according to the present invention, comprising: a heat radiation shield surrounded by a vacuum vessel having a refrigerator; A high-temperature superconducting coil housed in a radiation shield and enclosed and housed in a coil container, a heat transfer body that connects the refrigerator and the coil container to each other, and an electromagnetic shield provided in the coil container on the vacuum container side It is a thing.

Further, in order to achieve the above object, a high-temperature superconducting magnet according to the present invention has a heat radiation shield surrounded by a vacuum vessel equipped with a refrigerator and a heat radiation shield formed by the vacuum vessel. The high-temperature superconducting coil housed in the radiation shield and enclosed and housed in the coil container, a heat conductor for connecting the refrigerator and the coil container to each other, and an electromagnetic shield provided in the coil container on the vacuum container side, An electromagnetic shield and a heat transfer body for an electromagnetic shield for connecting the refrigerator to each other are provided.

According to a tenth aspect of the present invention, there is provided a high-temperature superconducting magnet according to the present invention, comprising: a heat radiation shield formed by being surrounded by a vacuum vessel provided with a refrigerator; A high-temperature superconducting coil housed in a radiation shield and surrounded by a coil container, a heat transfer member that connects the refrigerator and the coil container to each other, and an electromagnetic shield provided in the coil container on the vacuum container side, The electromagnetic shield comprises a heat conductor for electromagnetic shield for connecting the electromagnetic shield and the refrigerator to each other, and a heat insulating material interposed between the electromagnetic shield and the coil container.

In order to achieve the above object, a high-temperature superconducting magnet according to the present invention is a refrigerator for cooling a high-temperature superconducting coil provided in a vacuum vessel surrounding a heat radiation shield. And a heat reservoir cooling refrigerator, a high-temperature superconducting coil housed in the heat radiation shield and surrounded by a coil container, a heat reservoir equipped with the heat reservoir cooling refrigerator, and the high temperature superconducting coil cooling refrigerator. A single-point heat switch interposed in a heat transfer body that connects the coil container and the heat reservoir to each other.

According to a twelfth aspect of the present invention, there is provided a high-temperature superconducting magnet cooling refrigerator provided in a vacuum vessel surrounding a heat radiation shield. And a heat reservoir cooling refrigerator, a high-temperature superconducting coil housed in the heat radiation shield and surrounded by a coil container, a heat reservoir equipped with the heat reservoir cooling refrigerator, and the high temperature superconducting coil cooling refrigerator. A two-point heat switch interposed in a heat transfer body that connects the coil container and the heat reservoir to each other.

In order to achieve the above object, a high-temperature superconducting magnet according to the present invention has a refrigerator for cooling a high-temperature superconducting coil provided in a vacuum vessel surrounding a heat radiation shield. And a liquefied gas storage tank cooling refrigerator, a high-temperature superconducting coil housed in the heat radiation shield and surrounded by a coil container, and a liquefied gas storage tank mounted with the liquefied gas storage tank cooling refrigerator, A liquefied gas circulation path that circulates the medium of the liquefied gas storage tank through a control valve, a chiller for cooling the high-temperature superconducting coil, and a heat transfer body that connects the liquefied gas circulation path and the high-temperature superconducting coil to each other; It is provided with.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a high-temperature superconducting coil and a high-temperature superconducting magnet using the same according to the present invention will be described below with reference to the drawings and reference numerals attached to the drawings.
The high-temperature superconducting coil and the high-temperature superconducting magnet using the same according to the present invention are not limited to the following embodiments, but can be modified as appropriate without departing from the scope of the invention.

(First Embodiment of High Temperature Superconducting Coil) FIG.
FIG. 1 is a conceptual diagram showing a first embodiment of a high-temperature superconducting coil according to the present invention.

The high-temperature superconducting coil denoted by reference numeral 1 is a unit in which a first unit coil A, a second unit coil B ₁ , and a third unit coil B ₂ which are formed by winding a tape-shaped high-temperature superconducting wire 2 flatwise are coaxially arranged. It is the coil layer 3. The unit coil layer 3 to be used hereinafter
Indicates that one of a solenoid coil, a single pancake coil, and a double pancake coil, in which the tape-shaped high-temperature superconducting wire 2 is wound flatwise, is coaxially arranged. Further, the first unit coil A second unit coil _{B 1} and the third unit coil _{B 2}
And the second unit coil B
₁ and the third unit coil B ₂ of either the or homogeneous differing superconductivity, are so-called grading.

The high-temperature superconducting wire 2 is made of a bismuth-based, yttrium-based or thallium-based copper oxide high-temperature superconducting material formed into a tape by a silver sheath method, a silver coating method, or the like. Since the oxide high-temperature superconductor has a structure in which the crystal has a strong two-dimensional anisotropy, the high-temperature superconducting wire 2 is also made into a tape having a strong two-dimensional property so that high critical current characteristics can be obtained. That is, the critical current density for a magnetic field parallel to the tape surface is larger than the critical current density for a magnetic field perpendicular to the tape surface. The reason why the critical current characteristic of the high-temperature superconducting wire 2 is increased is that even if the coil operating current value is equal to or less than the critical current, if the difference is small, a flux flow loss occurs,
This is based on the fact that the heat load of the high-temperature superconducting coil 1 increases with this.

In the coil winding portion, the direction of the magnetic field acting on the high-temperature superconducting wire 2 and the strength of the electromagnetic force are not constant. In the vicinity of the center of the unit coil layer layer 3 of the coil axis CL, the magnetic field is strong, but the direction of the magnetic field is almost parallel to the tape surface, so that the critical current density of the high-temperature superconducting wire 2 increases. Coil axis C
In the vicinity of the end of the unit coil layer layer 3 of L, the magnetic field gradually becomes weaker, but the direction of the magnetic field becomes larger perpendicular to the tape surface, so the critical current density of the high-temperature superconducting wire 2 becomes lower. The electromagnetic force acting on the high-temperature superconducting wire 2 is larger at the center of the coil axis CL where the magnetic field is strong.

On the other hand, the superconducting properties of the high-temperature superconducting wire 2 manufactured by the silver sheathing method, the silver coating method or the like differ depending on the type of the base material. For example, when the base material is pure silver, a high critical current density can be obtained, but the mechanical strength is weak,
The critical current density is greatly deteriorated by the stress acting on the high-temperature superconducting wire 2.

On the other hand, when the base material is a silver alloy, the mechanical strength is high, and the critical current density is less deteriorated by stress, but the critical current density itself is small.

Therefore, in the high-temperature superconducting coil 1 shown in FIG. 1, the first unit coil A at the center of the coil axis CL is provided.
-Temperature superconducting wire 2 composed of silver as a base material and silver containing a silver alloy
Is used. Further, both sides of the second unit coil B ₁ and the third unit coil B of the first unit coil A
₂ uses a high-temperature superconducting wire ₂ made of pure silver as a base material.

Therefore, in the first unit coil A,
Since the magnetic field component perpendicular to the tape surface (wide side) of the high-temperature superconducting wire 2 is small, the critical current density can be increased. In the second unit coil B ₁ and the third unit coil B ₂ , a high stress acts on the high-temperature superconducting wire 2 due to a low electromagnetic force, and the deterioration of the critical current density is reduced. The current density is secured.

As described above, in the present embodiment, the high-temperature superconducting wire 2 having a different superconducting characteristic is selectively used depending on the portion in the coil cross section, so that the high-temperature superconducting coil 1 having a high critical current density and a small flux flow loss is used. Can be realized. In this embodiment, the high-temperature superconducting coil 1
The first unit coil A, the second unit and a coil B ₁ and the third unit Unit coil layer 3 of the coil B _2, using two kinds of high-temperature superconducting wire 2 with pure silver matrix and the silver alloy matrix However, the present invention is not limited to this. For example, by changing the ratio of the additive of the silver alloy of the wire 2, three or more kinds of the high-temperature superconducting wires 2 may be used to constitute the unit coil layer 3 with a larger number.

(Second Embodiment of High Temperature Superconducting Coil) FIG.
FIG. 4 is a conceptual diagram showing a second embodiment of the high-temperature superconducting coil according to the present invention. High temperature superconducting coil 1 according to the present embodiment
, Of the unit coil layer 3, the first unit coil A, the second unit coil B ₁ and the third unit the first unit coil A and the second unit coil B ₁ and the third unit with placing the coil B ₂ coaxially Coil B ₂
A donut-shaped spacer 4 is inserted coaxially with these coils.

In general, the magnetic field acting on the high-temperature superconducting wire ₂ in the second unit coil B ₁ and the third unit coil B ₂ at the ends remote from the coil axis CL is a magnetic field component perpendicular to the tape surface of the high-temperature superconducting wire 2. Becomes larger. This is due to the influence of the magnetic field generated by the first unit coil A at the center of the coil axis CL. Therefore, it is possible to be caused to decrease the influence of the magnetic field of the first unit coil A, increasing the second unit the critical current density of the coil B ₁ and the third unit coil B _2.

The present embodiment focuses on such a point, and the first unit coil A and the second unit coil B ₁
And in which the spacer 4 was inserted between the third unit coil B _2.

[0037] Thus, according to this embodiment, the first unit coil A and inserting the spacer 4 between the second unit coil B ₁ and the third unit coil B _2, the second from the first unit coil A Unit coil B ₁ and 3
Since then reduce the influence of the magnetic field applied to the unit coil B _2, it is possible to reduce the magnetic field component perpendicular to the tape surface of the high-temperature superconducting wire 2 of the second unit coil B ₁ and the third unit coil B _2, critical current The high-temperature superconducting coil 1 having a high density and a small flux flow loss can be realized. Incidentally, the high temperature superconducting coil 1 according to the present embodiment, among the unit coil layer 3, the first unit coil A, the second unit coil B ₁ and the third unit coil B ₂ and arranged coaxially, between two positions of the coil Spacer 4
However, more unit coil layers 3 may be arranged coaxially, and the number of spacers 4 may be increased accordingly.

(Third Embodiment of High Temperature Superconducting Coil) FIG. 3
FIG. 5 is a conceptual diagram showing a third embodiment of the high-temperature superconducting coil according to the present invention. High temperature superconducting coil 1 according to the present embodiment
It is (to the coil axis CL, transverse diameter of the side) inner diameter of the first unit coil A with larger than that of the second unit the coils B ₁ and the third unit coil B _2, the first unit coil A For example, a cylindrical electromagnetic force reinforcing member 5 such as reinforced fiber plastic (FRP) is provided on the inner diameter side.

As described above, in the present embodiment, the unit coil
Of the first unit coil A in the coil layer 3
There is no electromagnetic force reinforcing material 5 for the second unit coil
Le B ₁And the third unit coil B₂Especially on the inner diameter side
The effect of magnetism generated from the first unit coil A
The second unit coil B is kept low by the reinforcement 5₁And the first
3 unit coil B₂Of the high temperature superconducting wire 2
Critical current density is high due to reduced vertical magnetic field component
High temperature superconducting coil 1 with low flux flow loss
Can be realized. In this embodiment, the unit
Of the first unit coils of the
A and the second unit coil B₁And second unit carp
Le B₂However, this is not limited to this example.
Or a unit coil layer 3 with different inner and outer diameters
No. The high-temperature superconducting coil 1 according to the present embodiment is
The first unit coil A, the second unit coil
Carp B ₁And the third unit coil B₂Are arranged coaxially
However, by arranging more unit coil layers 3 coaxially
Is also good.

(Fourth Embodiment of High Temperature Superconducting Coil) FIG.
FIG. 7 is a conceptual diagram showing a fourth embodiment of the high-temperature superconducting coil according to the present invention. High temperature superconducting coil 1 according to the present embodiment
In the first embodiment, a current density decreasing portion 6 is provided coaxially with the coil 1 at a radially intermediate portion thereof in order to weaken the magnetic field of the first unit coil A.

The current density reduction section 6 may increase the thickness of the inter-turn insulator to reduce the space current density.
The non-winding portion may be embedded by embedding the electromagnetic force reinforcing member.

[0042] Thus, the present embodiment, among the unit coil layer 3, the current density reduction part 6 provided in an intermediate portion of the first unit coil A, the second unit coil B ₁ and the third unit coil B ₂ In particular, the influence of the magnetic field generated from the first unit coil A in the central portion on the inner diameter side is reduced, and the magnetic field component perpendicular to the tape surface of the high-temperature superconducting wire ₂ of the second unit coil B ₁ and the third unit coil B ₂ is reduced. Therefore, the high-temperature superconducting coil 1 having a high critical current density and a small flux flow loss can be realized. The high-temperature superconducting coil 1 according to the present embodiment includes the first unit coil A and the second unit coil A in the unit coil layer 3.
Was arranged unit coils B ₁ and the third unit coil B ₂ coaxially, it may be arranged more units coil layer 3 coaxially.

(Fifth Embodiment of High Temperature Superconducting Coil) FIG.
Shows a fifth embodiment of the high-temperature superconducting coil according to the present invention.
FIG. High temperature superconducting coil 1 according to the present embodiment
Represents the first unit coil A in the unit coil layer 3
Fourth unit with different or same superconductivity on both sides of
Coil C ₁And the fifth unit coil C₂Each of
Coaxially arranged, and the fourth unit coil C₁And the first
5 unit coil C₂A second unit on each side of the
Coil B₁And the third unit coil B₂Each of
While being coaxially arranged, the fourth unit coil C₁And
And the fifth unit coil C₂The excitation direction of each
1 unit coil A, 2nd unit coil B₁And the first
3 unit coil B ₂In the direction opposite to the excitation direction of
It was done.

[0044] Thus, the present embodiment, the fourth unit coil excitation direction _{C 1} and the fifth unit coil _{C 2,} the first unit coil A, the second unit coil _{B 1} and the third unit coil _{B 2} In the direction opposite to the excitation direction,
Second unit coil _{B 1} and the third unit coil _{B 2}
The high-temperature superconducting coil 1 having a high critical current density and a small flux flow loss can be realized because the magnetic field acting on the superconducting wire is canceled and the magnetic field component perpendicular to the tape surface of the high-temperature superconducting wire 2 is reduced. In the high-temperature superconducting coil 1 according to the present embodiment, the first unit coil A, the second unit coil B ₁ , the third unit coil B ₂ , the fourth unit coil C ₁ , and the fifth unit coil are provided after the unit coil layer 3. It was arranged C ₂ coaxially, may be arranged more units coil layer 3 coaxially.

(Sixth Embodiment of High Temperature Superconducting Coil) FIG.
FIG. 9 is a conceptual diagram showing a sixth embodiment of the high-temperature superconducting coil according to the present invention. High temperature superconducting coil 1 according to the present embodiment
Represents the second unit coil B in the unit coil layer 3
The spatial current density reduction part 7 to ₁ and the third unit radially intermediate portion of the coil B ₂ are those provided coaxially to the coil.

The space current density reduction portion 7 may reduce the space current density by increasing the thickness of the inter-turn insulator.
Further, the non-winding portion may be formed by burying the electromagnetic force reinforcing member.

As described above, in the present embodiment, the space current density reducing portion 7 is provided in the unit coil layer 3 at the intermediate portion between each of the second unit coil B ₁ and the third unit coil B ₂ , and the coil winding is formed. The magnetic field component perpendicular to the tape surface, which causes the critical current to decrease in the part, becomes particularly large.
Since was reduced unit coils B ₁ and the third unit coil B ₂ of the inner diameter side central portion of the high-temperature superconducting wire 2, it is possible to realize a small high-temperature superconducting coil 1 of the flux flow losses. Incidentally, the high temperature superconducting coil 1 according to the present embodiment, among the unit coil layer 3, the first unit coil A, but the second unit coil B ₁ and the third unit coil B ₂ disposed coaxially more unit coils Layer 3 may be arranged coaxially.

(First Embodiment of High Temperature Superconducting Magnet)
7 and 8 are conceptual diagrams showing a first embodiment of the high-temperature superconducting magnet according to the present invention.

The high-temperature superconducting magnet 8 according to this embodiment
Has an opening 10 provided in the heat radiation shield 9 so that a magnetic field can be used effectively.

In the conventional high-temperature superconducting magnet 11, as shown in FIGS. 16 and 17, since the efficiency of the refrigerator maintaining the temperature at 4K is low, it is necessary to suppress the heat of penetration due to heat radiation. And a heat radiation shield 12.

The refrigerator 13 is connected to the high-temperature superconducting coil 1 through a belt-like heat transfer member 14 made of, for example, aluminum or copper.
5 to cool the high-temperature superconducting coil 15.
Further, the high-temperature superconducting coil 15 is housed in a coil container 16 in order to suppress deformation due to electromagnetic force. However, when the high-temperature superconducting coil 15 is a solenoid, the coil container 16 may not be provided in some cases.

On the other hand, when a high magnetic field strength is required outside the vacuum vessel 17, the same magnetic field can be generated with a small operating current.
It is better to get closer to the side.

However, actually, the high-temperature superconducting coil 15
The gap between the heat radiation shield 12 and the heat radiation shield 12 and the vacuum vessel 17 is difficult to approach due to structural restrictions.

In this embodiment, such a point is taken into consideration. As shown in FIGS. 7 and 8, in order to secure a high magnetic field strength outside the vacuum vessel 18, the side using the magnetic field is used. An opening 10 is provided in the heat radiation shield 9.

In the present embodiment, the high-temperature superconducting coil 1 can be brought closer to the vacuum vessel 18 side by the thickness of the heat radiation shield 9 and the single layer of the two heat insulating spaces, thereby ensuring a high magnetic field strength. it can. In addition, if the opening 10 of the heat radiation shield 9 is provided, heat entering by radiation increases, but since the opening 10 is a part of the whole, the increase of heat entering is minimized. Further, if the operating temperature of the high-temperature superconducting coil 1 is set to about 20K, a refrigerating capacity about 10 times that of the refrigerator 19 at a temperature of 4K can be obtained, which is sufficient as a high-temperature superconducting magnet.

The other structure is the same as the structure shown in FIG. 15, and therefore, the same reference numerals are given and the description is omitted.

According to the present embodiment, the opening 10 is provided in the heat radiation shield 9 on the side using the magnetic field, and the distance between the position using the magnetic field and the high-temperature superconducting coil 1 is reduced. The superconducting magnet 8 can be realized.

(Second Embodiment of High Temperature Superconducting Magnet)
FIG. 9 is a conceptual diagram showing a second embodiment of the high-temperature superconducting magnet according to the present invention.

High temperature superconducting magnet 8 according to this embodiment
The electromagnetic shield 20 is provided on the side of the coil container 21 containing the high-temperature superconducting coil 1 that utilizes the magnetic field. The electromagnetic shield 20 is made of a low-resistance metal or a high-temperature superconductor.

Conventionally, in the high-temperature superconducting magnet 11, a fluctuating magnetic field may be applied from the side using the magnetic field when the generated magnetic field is effectively used. Due to the fluctuating magnetic field, a loss occurs in the high-temperature superconducting coil 1, the coil container 21 made of stainless steel, or the like, which results in a large heat load.

In the present embodiment, in consideration of such a point, the electromagnetic shield 20 is provided on the side of the coil container 21 using the magnetic field.

Therefore, according to the present embodiment, the electromagnetic shield 20 is provided on the coil container 21 to block the fluctuating magnetic field applied from the side that uses the magnetic field, and the AC loss generated in the coil container 21 and the high-temperature superconducting coil 1 is reduced. Was suppressed,
The high-temperature superconducting magnet 8 with a small heat load can be realized.

(Third Embodiment of High Temperature Superconducting Magnet)
FIG. 10 is a conceptual diagram showing a third embodiment of the high-temperature superconducting magnet according to the present invention.

The high-temperature superconducting magnet 8 according to the present embodiment
The electromagnetic shield 20 is provided on the side of the coil container 21 that houses the high-temperature superconducting coil 1 on the side that utilizes the magnetic field, and the electromagnetic shield 20 is provided with an aluminum or copper strip-shaped electromagnetic shield heat conductor 22. And connected to the refrigerator 19.

The electromagnetic shield 20 suppresses the occurrence of AC loss in the coil container 21 and the high-temperature superconducting coil 1 due to the fluctuating magnetic field applied from the side using the magnetic field.
At that time, a loss occurs in the electromagnetic shield 20 itself. In addition, since there is no heat radiation shield between the side using the magnetic field and the vacuum 18, the radiation heat is large. When such heat is conducted to the high-temperature superconducting coil 1 via the coil container 21, the temperature of the high-temperature superconducting coil 1 rises, which causes an increase in flux flow loss.

According to the present embodiment, the AC loss generated in the electromagnetic shield 20 by the radiant heat and the fluctuating magnetic field is efficiently cooled by the refrigerator 19 via the electromagnetic shield heat transfer member 22, so that the stability is improved. High temperature superconducting magnet 8
Can be realized.

(Fourth Embodiment of High Temperature Superconducting Magnet)
FIG. 11 is a conceptual diagram showing a fourth embodiment of the high-temperature superconducting magnet according to the present invention.

The high-temperature superconducting magnet 8 according to the present embodiment
Is provided with an electromagnetic shield 20 on the side of the coil container 21 that houses the high-temperature superconducting coil 1 on the side that utilizes the magnetic field, and the electromagnetic shield 20 is provided with an aluminum or copper band-shaped electromagnetic shield heat transfer body 22 interposed therebetween. In addition to being connected to the refrigerator 19, a heat insulating member 23 is interposed between the electromagnetic shield 22 and the coil container 21.

The heat entering the electromagnetic shield 20, such as radiant heat from the vacuum vessel 18 and heat generated by a fluctuating magnetic field, covers a wide area of the coil vessel 21. A temperature difference occurs, and the coil container 21 and, consequently, the high-temperature superconducting coil 1
The heat of infiltration into the air may increase. Even if a temperature difference occurs in the electromagnetic shield 20, the electromagnetic shield 20
If the heat insulating member 23 is provided between the coil container 21 and the coil container 21, heat entering the coil container 21 can be reduced.

According to the present embodiment, since the heat insulating member 23 is interposed between the electromagnetic shield 20 and the coil container 21, the loss generated in the electromagnetic shield 20 due to radiant heat or a fluctuating magnetic field can be prevented from being transmitted to the electromagnetic shield. Since the refrigerator 19 is cooled more efficiently through the heat body 22, the high-temperature superconducting magnet 8 with high stability can be realized.

(Fifth Embodiment of High Temperature Superconducting Magnet)
FIG. 12 is a conceptual diagram showing a fifth embodiment of the high-temperature superconducting magnet according to the present invention.

The high-temperature superconducting magnet 8 according to the present embodiment
Is a vacuum vessel 18 surrounding the heat radiation shield 9 containing the high-temperature superconducting coil 1 surrounded by the coil vessel 21.
High-temperature superconducting coil cooling refrigerator 24 for cooling high-temperature superconducting coil 1 and heat reservoir cooling refrigerator 2 for cooling heat reservoir 25
6 is provided.

The heat reservoir cooling refrigerator 26 is provided with a heat reservoir 25. The heat reservoir 25 is thermally heated by a strip-shaped heat transfer member 28 made of aluminum or copper, which connects the high-temperature superconducting coil 1 and the high-temperature superconducting coil cooling refrigerator 24 via a mechanical or gas type one-point heat switch 27. Connected to

The heat reservoir 25 is made of a solid material such as lead, epoxy, or magnetic regenerator, or a liquefied gas such as liquid hydrogen, liquid helium, liquid neon, or liquid helium.

As shown in FIG. 18, the conventional high-temperature superconducting magnet 11 equipped with the heat reservoir 25 thermally connects the high-temperature superconducting coil 15, the refrigerator 13 and the heat reservoir 29 with the heat transfer member 14. I was letting it. Further, since the heat reservoir 29 was connected to the refrigerator 13, the temperature of the heat reservoir 29 was almost the same as the coil operating temperature.

For this reason, if there is a power failure or a failure of the refrigerator 13, the temperature rise of the high-temperature superconducting coil 15 is suppressed,
It becomes higher than the normal operating temperature. When the operating temperature rises, the flux flow loss of the high-temperature superconducting coil 15 increases, and the temperature rise accelerates. In order to continue the operation time for a long time, it is necessary to previously set the operation temperature to a low value, but the efficiency of the refrigerator 14 is deteriorated accordingly.

On the other hand, from the viewpoint of the weight and volume required for continuing the operation time, it is very promising to use liquid helium as the material of the heat reservoir 29. However, since the boiling point is about 4 K, which is lower than the operating temperature of the high-temperature superconducting coil 15, when the high-temperature superconducting coil 15 is brought into direct contact with the high-temperature superconducting coil 15, the heat load on the liquid helium increases, and the heat load on the liquid helium increases. Was difficult to use.

However, in the present embodiment shown in FIG.
Since the one-point heat switch 27 is provided between the high-temperature superconducting coil 1 surrounded by the coil container 21 and the heat reservoir 25 in the high-temperature superconducting magnet 8, the temperatures of the high-temperature superconducting coil 1 and the heat reservoir 25 are set independently. be able to. Also,
The heat reservoir 25 is separated from the high-temperature superconducting coil 1 by another cooling means.
It can be cooled to a lower temperature. Liquid helium can also be used as the heat reservoir 25.

As described above, in this embodiment, since the one-point type thermal switch 27 is provided between the high-temperature superconducting coil 1 and the heat reservoir 25, the heat reservoir 25 is maintained at a temperature lower than the operating temperature of the high-temperature superconducting coil 1. Thus, the high-temperature superconducting magnet 8 can be operated for a long time after the high-temperature superconducting coil cooling refrigerator 24 is stopped.

(Sixth Embodiment of High Temperature Superconducting Magnet)
FIG. 13 is a conceptual diagram showing a sixth embodiment of the high-temperature superconducting magnet according to the present invention.

The high-temperature superconducting magnet 8 according to the present embodiment
Is a heat reservoir 25 provided with a high-temperature superconducting coil cooling refrigerator 24, a heat reservoir cooling refrigerator 26, and an aluminum or copper strip-shaped heat conductor for connecting the high-temperature superconducting coil 1 surrounded by the coil container 21 to each other. 28, a two-point heat switch 30 is provided.

The two-point heat switch 30 is configured to conduct any two of the high-temperature superconducting coil cooling refrigerator 24, the heat reservoir 25, and the high-temperature superconducting coil 1.

As described above, in the present embodiment, the high-temperature superconducting coil cooling refrigerator 24, the heat reservoir 25 provided with the heat reservoir cooling refrigerator 26, and the high-temperature superconducting coil 1 surrounded by the coil container 21 are connected to each other. A two-point heat switch 30 is provided on the heat transfer body 28, and the two-point heat switch 30 is used to cool the high-temperature superconducting coil cooling refrigerator 24, the heat reservoir 25 having the heat reservoir cooling refrigerator 26, and the high-temperature superconducting coil 1. Since any two of them were made conductive, even if one of the refrigerators 24, 26 failed, the remaining one could be operated in the freezing operation, and the heat from the failed one could be operated. And the high-temperature superconducting magnet 8 that can be operated continuously for a long time can be realized.

(Seventh Embodiment of High Temperature Superconducting Magnet)
FIG. 14 is a conceptual diagram showing a seventh embodiment of the high-temperature superconducting magnet according to the present invention.

The high-temperature superconducting magnet 8 according to the present embodiment
Is composed of a high-temperature superconducting coil cooling refrigerator 24 for cooling the high-temperature superconducting coil 1 surrounded by the coil container 21 in the vacuum container 18 and a liquefied gas storage tank cooling refrigerator 37 for cooling the liquefied gas storage tank 36. It is provided.

The high-temperature superconducting magnet 8 according to the present embodiment comprises a heat radiation shield 9 surrounded by a vacuum vessel 18.
The liquefied gas storage tank 36 contains a high-temperature superconducting coil 1 surrounded by a coil container 21 and a liquefied gas storage tank 36 equipped with a liquefied gas storage tank cooling refrigerator 37. A liquefied gas circulation path 39 with an interposed 38 is provided, and the high-temperature superconducting coil cooling refrigerator 24, the high-temperature superconducting coil 1, and the liquefied gas circulation path 39 are connected to each other by an aluminum or copper strip-shaped heat conductor 28. It is.

In the high temperature superconducting magnet 8 having such a configuration, when the high temperature superconducting coil cooling refrigerator 24 is operating normally, the control valves 38 and 3 of the liquefied gas circulation path 39 are controlled.
8, the liquefied gas storage tank 36 and the high-temperature superconducting coil 1 are thermally shut off, and a liquefied gas having a boiling point lower than the operating temperature of the high-temperature superconducting coil 1 such as liquid helium is used as a heat reservoir. Then, the high temperature superconducting coil 1 is cooled by the high temperature superconducting coil cooling refrigerator 24.

On the other hand, when the refrigerator 24 for cooling the high-temperature superconducting coil is stopped due to a power failure or failure, the control valves 38 and 38 are opened, and the liquefied gas in the liquefied gas circulation path 39 is circulated.
The high-temperature superconducting coil 1 is cooled.

As described above, in the present embodiment, the control valves 38 and 3 are connected to the liquefied gas storage tank 36 housed in the heat radiation shield 9.
8 is provided, and the boiling point is lower than the operating temperature of the high-temperature superconducting coil 1 even if the high-temperature superconducting coil cooling refrigerator 24 is stopped due to an accident or the like. The liquefied gas storage tank 36 for cooling the high-temperature superconducting coil 1 by circulating is used as a heat reservoir, so that a high-temperature superconducting magnet that can be operated continuously for a long time can be realized.

[0090]

As described above, the high-temperature superconducting coil according to the present invention increases the critical current density by reducing the magnetic field component in the direction perpendicular to the tape surface of the high-temperature superconducting wire that reduces the critical current density. As a result, the flux flow loss can be reduced, and efficient operation can be performed.

In the high-temperature superconducting magnet according to the present invention, an opening is provided in the heat radiation shield, so that a high magnetic field can be effectively used. In addition, a liquefied gas circulation path with a heat switch and a control valve interposed in the heat reservoir is provided, so that even if the high-temperature superconducting coil cooling refrigerator that cools the high-temperature superconducting coil fails, sufficient measures can be taken. Continuous operation can be performed.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of a high-temperature superconducting coil according to the present invention.

FIG. 2 is a conceptual diagram showing a second embodiment of the high-temperature superconducting coil according to the present invention.

FIG. 3 is a conceptual diagram showing a third embodiment of the high-temperature superconducting coil according to the present invention.

FIG. 4 is a conceptual diagram showing a fourth embodiment of the high-temperature superconducting coil according to the present invention.

FIG. 5 is a conceptual diagram showing a fifth embodiment of the high-temperature superconducting coil according to the present invention.

FIG. 6 is a conceptual diagram showing a sixth embodiment of the high-temperature superconducting coil according to the present invention.

FIG. 7 is a conceptual diagram showing a first embodiment of a high-temperature superconducting magnet according to the present invention.

FIG. 8 is a cutaway view as seen from the direction of arrows XX in FIG. 7;

FIG. 9 is a conceptual diagram showing a second embodiment of the high-temperature superconducting magnet according to the present invention.

FIG. 10 is a conceptual diagram showing a third embodiment of the high-temperature superconducting magnet according to the present invention.

FIG. 11 is a conceptual diagram showing a fourth embodiment of the high-temperature superconducting magnet according to the present invention.

FIG. 12 is a conceptual diagram showing a fifth embodiment of the high-temperature superconducting magnet according to the present invention.

FIG. 13 is a conceptual diagram showing a sixth embodiment of the high-temperature superconducting magnet according to the present invention.

FIG. 14 is a conceptual diagram showing a seventh embodiment of the high-temperature superconducting magnet according to the present invention.

FIG. 15 is a conceptual diagram showing a conventional high-temperature superconducting coil.

FIG. 16 is a conceptual diagram showing a conventional high-temperature superconducting magnet.

FIG. 17 is a cutaway view as seen from the direction of arrows YY in FIG. 16;

FIG. 18 is a conceptual diagram showing another conventional high-temperature superconducting magnet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High temperature superconducting coil 2 High temperature superconducting wire 3 Unit coil layer 4 Spacer 5 Electromagnetic force reinforcement 6 Current density reduction part 7 Space current density reduction part 8 High temperature superconducting magnet 9 Heat radiation shield 10 Opening 11 High temperature superconducting magnet 12 Heat radiation shield 13 Refrigerator 14 Heat transfer member 15 High temperature superconducting coil 16 Coil container 17, 18 Vacuum container 19 Refrigerator 20 Electromagnetic shield 21 Coil container 22 Electromagnetic shield heat transfer member 23 Insulation material 24 High temperature superconducting coil cooling refrigerator 25 Heat reservoir 26 Heat Storage cooling refrigerator 27 Single-point heat switch 28 Heat transfer body 29 Heat storage 30 Two-point heat switch 36 Liquefied gas storage tank 37 Liquefied gas storage tank cooling refrigerator 38 Control valve 39 Liquefied gas circulation path 40 High temperature superconducting wire

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eriko Yoneda 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Keihin Works Co., Ltd. (72) Yukihiro Sumiyoshi 2-chome, Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Street address Toshiba Keihin Works

Claims (13)

[Claims] 1. A high-temperature coil in which a unit coil layer is formed by coaxially arranging a second unit coil and a third unit coil on both sides of a first unit coil among a plurality of coils obtained by winding a high-temperature superconducting wire in a flat width. In the superconducting coil, a high-temperature superconducting wire made of silver containing a silver alloy is used as a base material for the first unit coil, and a high-temperature superconducting wire made of pure silver is used for the second unit coil and the third unit coil. A high-temperature superconducting coil characterized by the fact that 2. A high-temperature coil in which a unit coil layer is formed by coaxially arranging a second unit coil and a third unit coil on both sides of a first unit coil among a plurality of coils obtained by winding a high-temperature superconducting wire in a flat-wise manner. A high-temperature superconducting coil in which a donut-shaped spacer is inserted between the first unit coil, the second unit coil, and the third unit coil coaxially with the first and second unit coils. 3. A high-temperature coil in which a unit coil layer is formed by coaxially arranging a second unit coil and a third unit coil on both sides of a first unit coil among a plurality of coils obtained by winding a high-temperature superconducting wire in a flat-wise manner. A high-temperature superconducting coil, wherein a cylindrical electromagnetic force reinforcing member is provided coaxially with the first unit coil on the inner diameter side of the first unit coil. 4. A high-temperature coil in which a unit coil layer is formed by coaxially arranging a second unit coil and a third unit coil on both sides of a first unit coil among a plurality of coils formed by winding a high-temperature superconducting wire in a flat-wise manner. A high-temperature superconducting coil, wherein the first unit coil is divided into an inner diameter side and an outer diameter side, and an intermediate portion thereof is a current density reduction portion. 5. A plurality of coils formed by winding a high-temperature superconducting wire in a flat-wise manner, wherein a fourth unit coil and a fifth unit coil are coaxially arranged on both sides of the first unit coil, and the fourth unit coil and the fifth unit coil are arranged coaxially. In a high-temperature superconducting coil in which a second unit coil and a third unit coil are coaxially arranged on one side of a unit coil and formed on a unit coil layer, at least one or more of the first unit coil to the fifth unit coil are used. A high-temperature superconducting coil characterized in that the current flow directions of the coil and the remaining coils are formed in opposite directions. 6. A high-temperature coil having a unit coil layer formed by coaxially arranging a second unit coil and a third unit coil on both sides of a first unit coil among a plurality of coils obtained by winding a high-temperature superconducting wire in a flat width. A high-temperature superconducting coil, wherein the second unit coil and the third unit coil are divided into an inner diameter side and an outer diameter side, and an intermediate part thereof is a space current density reduction part. 7. A heat radiation shield surrounded by a vacuum vessel provided with a refrigerator, a high-temperature superconducting coil housed in the heat radiation shield and surrounded by a coil vessel, and the refrigerator and the coil vessel. A high-temperature superconducting magnet, comprising: a heat conductor to be connected to each other; and an opening formed on the magnetic radiation utilization side of the heat radiation shield. 8. A heat radiation shield surrounded by a vacuum vessel provided with a refrigerator, a high-temperature superconducting coil housed in the heat radiation shield and surrounded by a coil vessel, and the refrigerator and the coil vessel. A high-temperature superconducting magnet, comprising: a heat conductor connected to each other; and an electromagnetic shield provided on the coil container on the vacuum container side. 9. A heat radiation shield surrounded and formed by a vacuum vessel provided with a refrigerator, a high-temperature superconducting coil housed in the heat radiation shield and surrounded and housed by a coil vessel, and the refrigerator and the coil vessel. A heat transfer body to be connected to each other, an electromagnetic shield provided in the coil container on the vacuum vessel side, and a heat transfer body for an electromagnetic shield to connect the electromagnetic shield and the refrigerator to each other are provided. High temperature superconducting magnet. 10. A heat radiation shield surrounded by a vacuum vessel equipped with a refrigerator, and housed in the heat radiation shield.
A high-temperature superconducting coil enclosed and housed in a coil container, and a heat transfer body that connects the refrigerator and the coil container to each other,
An electromagnetic shield provided on the coil container on the vacuum container side, a heat transfer member for electromagnetic shield for connecting the electromagnetic shield and the refrigerator to each other, and heat insulation interposed between the electromagnetic shield and the coil container. A high-temperature superconducting magnet, comprising: 11. A refrigerator for cooling a high-temperature superconducting coil and a refrigerator for cooling a heat reservoir provided in a vacuum vessel surrounding and forming a heat radiation shield, and a high-temperature superconducting coil housed in the heat radiation shield and surrounded by the coil vessel. A heat reservoir equipped with the heat reservoir cooling refrigerator, and a single-point heat switch interposed in a heat transfer body that connects the high-temperature superconducting coil cooling refrigerator, the coil container, and the heat reservoir to each other. A high-temperature superconducting magnet, characterized in that: 12. A high-temperature superconducting coil cooling refrigerator and a heat reservoir cooling refrigerator provided in a vacuum vessel surrounding and forming a heat radiation shield, and a high-temperature superconducting coil housed in the heat radiation shield and surrounded by the coil vessel. A heat reservoir equipped with the heat reservoir cooling refrigerator, and a two-point heat switch interposed in a heat transfer body that connects the high-temperature superconducting coil cooling refrigerator, the coil container and the heat reservoir to each other. A high-temperature superconducting magnet, characterized in that: 13. A refrigerator for cooling a high-temperature superconducting coil and a refrigerator for cooling a liquefied gas storage tank provided in a vacuum vessel surrounding and forming a heat radiation shield, and a high-temperature superheater housed in the heat radiation shield and surrounded by the coil vessel. A superconducting coil, a liquefied gas storage tank equipped with the liquefied gas storage tank cooling refrigerator, a liquefied gas circulation path for circulating the medium of the liquefied gas storage tank through a control valve, A high-temperature superconducting magnet, comprising: a coil cooling refrigerator; and a heat conductor that connects the liquefied gas circulation path and the high-temperature superconducting coil to each other.