JP2009188064A - Superconductive magnet device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently exhibit characteristics of a superconductive coil by preventing a critical current from being decreased by reducing a vertical component to the tape surface of a superconducting wire in magnetic fields applied to the superconducting wire at both end positions in the axial direction of the superconductive coil when a magnetic field is generated among a plurality of superconductive coils. <P>SOLUTION: In the superconductive magnet device 10, the superconductive coil 30 around which the superconducting wire 30a formed of a tape is wound is disposed oppositely with a space 50 in a vertical direction X with respect to a tape surface, and magnetic flux is generated between ends in an axial direction Y of the superconducting coil 30. In the superconductive magnet device, a magnetic field shielding plate for preventing the magnetic flux from being short-circuited is arranged between the tape surfaces by magnetic field components generated in the vertical direction X with respect to the tape surfaces at the space 50 between the tape surfaces that oppose the superconductive coil 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a superconducting magnet device, and more specifically, in a superconducting magnet device in which a superconducting coil wound with a superconducting wire made of a tape is disposed opposite to each other with a space therebetween, the superconducting magnet device is generated in a direction perpendicular to the tape surface in the space. This prevents a short circuit from occurring due to a leakage magnetic field.

Conventionally, various superconducting coils formed by winding a tape-shaped superconducting wire have been provided.
For example, as shown in FIG. 6, the superconducting coil 1 provided in Japanese Patent Laid-Open No. 2002-110416 (Patent Document 1) has a coil portion 1a obtained by winding a so-called flatwise winding of a tape-shaped superconducting wire 2 in the axial direction. Laminated to form a cylindrical shape. In the superconducting coil 1, the tape surface 2 a of the superconducting coil 2 surrounding the hollow portion 1 b is arranged in parallel with the central axis 0 therebetween.
(Please add 1b to the drawing.) → Added.

In recent years, a superconducting magnet device has been provided as an application example of such a superconducting coil. For example, the superconducting magnet apparatus shown in FIG. 7 has superconducting coils 1A and 1B wound around both side portions 8a-A and 8a-B of a C-type iron core 8, respectively.
In this case, a magnetic field 6 is generated from the tip 8b-A of one iron core around which the superconducting coil 1A is wound toward the tip 8b-B of the other iron core. At the same time, a magnetic field having a component in the vertical direction on the tape surfaces of the superconducting coils 1A and 1B on both sides facing each other across the space, so-called leakage magnetic field 7, is generated.

When a leakage magnetic field, which is a magnetic field component perpendicular to the tape surface, is generated in the superconducting wire of the superconducting coil, the critical current of the superconducting coil is lowered.
FIG. 8A shows the critical current when a magnetic field perpendicular to the tape surface of the superconducting wire is applied, and FIG. 8B shows the case where the tape surface of the superconducting wire and the magnetic field direction are parallel. Indicates critical current. As can be seen from this graph, the superconducting wire with a magnetic field perpendicular to the tape surface in any case is a superconducting wire with the tape surface parallel to the direction of the magnetic field, regardless of the magnitude of the magnetic field and the cooling temperature conditions. The critical current is smaller than that. The numerical value on the vertical axis of the graph of FIG. 8 indicates the magnitude of the critical current when the critical current is 1 when the superconducting wire is energized in a state where the magnetic flux density is 0 stella (T) and the temperature is 77 Kelvin (K). Indicates.

  As described above, when a magnetic field is generated between a plurality of superconducting coils, there is a problem that the critical current is lowered and the performance of the superconducting coil is lowered due to the leakage magnetic field of the component perpendicular to the tape surface of the superconducting coil.

JP 2002-110416 A

  The present invention has been made in view of the above problems, and in the case where a magnetic field is generated between a plurality of superconducting coils, the magnetic field applied to the superconducting wires at both end positions in the axial direction of the superconducting coils with respect to the tape surface of the superconducting wires. Therefore, it is an object to suppress the vertical component to prevent the critical current from being lowered and to efficiently exhibit the characteristics of the superconducting coil.

In order to solve the above-mentioned problems, the present invention provides a superconducting coil in which a superconducting wire made of a tape is wound so as to be opposed to each other with a space in a direction perpendicular to the tape surface, and between the ends in the axial direction of these superconducting coils. A superconducting magnet device that generates magnetic flux at
A magnetic field shielding material for preventing a short circuit of magnetic flux between the tape surfaces by a magnetic field component generated in a direction perpendicular to the tape surface is disposed in a space between the opposing tape surfaces of the superconducting coil. A superconducting magnet device is provided.

When current is passed through multiple superconducting coils to generate magnetic flux between the axial ends of each superconducting coil, at the same time, the space between the opposing tape surfaces of the superconducting coils is perpendicular to the tape surface of the superconducting coils. Directional leakage magnetic field is generated.
For this reason, a magnetic field shielding material is arranged in the space between the opposing tape surfaces of the superconducting coil, and a canceling magnetic field is generated in the direction to cancel the leakage magnetic field in the magnetic field shielding material, thereby making the direction perpendicular to the tape surface of the superconducting wire. Thus, the critical current can be prevented from being lowered and the characteristics of the superconducting coil can be improved.

  The superconducting coil is preferably composed of a pair of superconducting coils wound around both sides of the C-type iron core, and the magnetic field shielding material is disposed in the space on the opening side of the C-type iron core.

Even when a pair of superconducting coils are wound around a C-type iron core and a current flows, the magnetic field from the tip in the axial direction of one superconducting coil to the tip of the other superconducting coil through the space on the opening side of the C-type iron core At the same time, a leakage magnetic field having a component perpendicular to the tape surface of the superconducting wire is generated in the space on the opening side of the C-type iron core.
For this reason, by arranging the magnetic field shielding material in the space on the opening side of the C-type iron core, the component in the direction perpendicular to the tape surface of the superconducting wire is reduced, and the reduction of the critical current is prevented to prevent the superconducting coil. The characteristics can be improved.

  In this case, a magnetic field directed toward the other superconducting coil is generated from the end in the axial direction opposite to the opening side of the C-type core of one superconducting coil through the base connecting both sides of the C-type core. However, since it passes through the iron core, there is little leakage magnetic field. For this reason, it is not necessary to arrange a magnetic shielding material in the space opposite to the opening side of the C-type iron core.

  The superconducting coil is composed of a superconducting coil wound around a pair of linear iron cores arranged parallel to each other with a space therebetween, and the magnetic field shielding material is arranged in the space at both ends in the length direction of the pair of iron cores. It may be.

According to the said structure, the magnetic field which goes around through a pair of iron core arranged in parallel and the opening side of the both ends of the length direction of this iron core generate | occur | produces. That is, a magnetic field is generated from one end in the length direction of a pair of iron cores to one end of the other iron core through the opening side of the iron core, and from the other end in the length direction of the other iron core to the other end of one iron core, A magnetic field opposite to the magnetic field is generated.
At the same time, a leakage magnetic field having a component perpendicular to the tape surface of the superconducting wire is generated in the space at one end in the length direction of the pair of iron cores, and the leakage in the space at one end in the length direction of the iron core. A leakage magnetic field opposite to the magnetic field is generated.
For this reason, by arranging the magnetic field shielding material in the space at both ends of the iron core, a cancellation magnetic field is generated in the direction to cancel the leakage magnetic field in the magnetic field shielding material, and the component in the direction perpendicular to the tape surface of the superconducting wire is generated. As a result, the characteristics of the superconducting coil can be improved by preventing the critical current from decreasing.

  The magnetic field shielding material is a short-circuited superconducting coil or a superconducting coil connected to a power source, and the axial direction of the superconducting coil is arranged in a direction perpendicular to the tape surface, and a vertical direction generated on the tape surface. It is preferable to generate a magnetic field that attenuates the magnetic field component.

  When a superconducting coil in which the magnetic field shielding material is short-circuited, the magnetic field shielding material generates a canceling magnetic field in a direction that cancels out the leakage magnetic field perpendicular to the tape surface generated by the superconducting coil by electromagnetic induction. For this reason, the perpendicular magnetic field component generated on the tape surface of the superconducting coil is attenuated, and the reduction of the critical current can be prevented.

  When the magnetic field shielding material is a superconducting coil connected to a power source, a current is passed through the magnetic field shielding material to generate a canceling magnetic field in a direction that cancels out the leakage magnetic field perpendicular to the tape surface of the superconducting coil. For this reason, the leakage magnetic field component in the vertical direction generated on the tape surface of the superconducting coil is attenuated, and a reduction in critical current can be prevented.

  The magnetic field shielding material is made of a bulk superconductor, and the bulk superconductor is disposed so as to protrude from the space between the tape surfaces to the magnetic flux path side, and a vertical magnetic field component generated on the tape surface is arranged on the magnetic flux path side. You may be guided to.

A bulk superconductor is a lump (bulk) oxide superconductor. The bulk superconductor protrudes from the space between the tape surfaces of the superconducting coil to the magnetic flux path side, and the magnetic field does not enter the bulk superconductor due to the Meissner effect, so it occurs on the tape surface of the superconducting coil. The leakage magnetic field component in the vertical direction is induced to the magnetic flux path side without passing through the bulk superconductor.
For this reason, the leakage magnetic field component in the vertical direction generated on the tape surface of the superconducting coil is attenuated, and a reduction in critical current can be prevented.

  As described above, according to the superconducting magnet device of the present invention, when a current is passed through a plurality of superconducting coils to generate magnetic flux between the end portions in the axial direction of each superconducting coil, the tapes facing the superconducting coils are simultaneously used. A leakage magnetic field perpendicular to the tape surface of the superconducting coil is generated in the space between the surfaces, but a magnetic shielding material is disposed in the space between the opposing tape surfaces of the superconducting coil, and the leakage magnetic field is applied to the magnetic shielding material. By generating a canceling magnetic field in the direction of cancellation, the critical current can be prevented from being lowered and the characteristics of the superconducting coil can be improved.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention.
As shown in FIG. 1, a superconducting magnet device 10 of the present invention includes a C-type iron core 20, a pair of superconducting coils 30 wound around the C-type iron core 20 by winding a superconducting wire 30a made of a tape, and a magnetic shielding material. It consists of the magnetic shielding coil 40 which comprises.

The C-type iron core 20 is formed of a base portion 20a having a rectangular cross section and a pair of straight side portions 20b-A and 20b-B protruding in the same direction from both ends of the base portion 20a. A pair of superconducting coils 30A and 30B are wound around the both side portions 20b-A and 20b-B so that the opening-side tip 20c of both side portions 20b protrudes from the opening-side end portion 30b in the axial direction Y of the superconducting coil 30. I have to.
A space 50 is formed in the direction X perpendicular to the tape surface 30d of the superconducting wire 30a between the pair of opposed superconducting coils 30A and 30B.
The base 20a and the side portions 20b-A and 20b-B are not limited to a rectangular cross section, and may be a circular cross section.

The magnetic shielding coil 40 is a space 50 between the opposing tape surfaces 30d of the superconducting coils 30A and 30B on the opening side of the C-type iron core 20, and is an intermediate position between both side portions 20b of the C-type iron core 20, and The C-type iron core 20 is disposed so as not to protrude from the opening-side tip 20c of the both side portions 20b or slightly protruded.
The magnetic shielding coil 40 is composed of a superconducting coil. A superconducting wire 40a made of tape is wound flatwise on a cylindrical winding frame, and both ends of the superconducting wire 40a are short-circuited by welding, soldering or silver brazing.
The magnetic shield coil 40 is arranged so that the axial direction Z of the superconducting coil is perpendicular to the tape surface 30 d of the superconducting coil 30 wound around the C-type iron core 20. The inner diameter of the magnetic shielding coil 40 is preferably 5% to 50% of the length in the axial direction Y of the superconducting coil wound around the C-type iron core 20, and is set to 20% in this embodiment. The number of turns is determined in consideration of the amount of magnetic field to be shielded.

  The superconducting coil 30 wound around the C-type iron core 20 is formed by laminating a plurality of single pancake coils 30c in the axial direction Y. The single pancake coil 30c has a superconducting wire 30a made of tape formed in a cylindrical winding frame. It is rolled flatwise. The end faces in the axial direction Y of the plurality of single pancake coils 30c are overlapped, and superconducting wires 30a of adjacent pancake coils are welded and connected to form one superconducting coil 30. End faces of the superconducting wires 30a of the pancake coils at both ends are connected to a power source (not shown) through lead wires (not shown).

Note that a double pancake coil may be used as the superconducting coil 30.
Also, the magnetic shielding coil 40 may be formed by laminating a plurality of single pancake coils in the axial direction Y, similarly to the superconducting coil 30 wound around the C-type iron core 20.
In FIG. 1, the illustration of the insulating material interposed between the superconducting wires 30a and 40a of the superconducting coil 30 and the magnetic shielding coil 40 is omitted. However, when the superconducting wires 30a and 40a are wound, the superconducting wire 30a is not shown. , 40a is overlapped with a tape-like insulating material, and the insulating material is wound together with the superconducting wires 30a, 40a so that the adjacent superconducting wires 30a, 40a do not come into contact with each other.

  The superconducting coil 30 and the magnetic shielding coil 40 are respectively accommodated in a cooling container (not shown) and cooled with liquid nitrogen to be in a superconducting state. The magnetic shielding coil 40 is supported and fixed in the space 50 on the opening side of the C-type iron core 20 by fixing the cooling container of the magnetic shielding coil 40 to a housing case (not shown) of the superconducting magnet device 10.

Next, a method of attenuating the leakage magnetic field φ2 that is the magnetic field component in the vertical direction X generated on the tape surface 30d of the superconducting coil 30 by the magnetic shielding coil 40 will be described.
When a current is passed through the superconducting coil 30, as shown in FIG. 1, the magnetic field φ1 extends in the direction from the tip 20c-A of one side 20b-A to the tip 20c-B of the other side 20b-B. Will occur. At the same time, the tape of the superconducting coil 30 extends from the tape surface 30d-A of the superconducting coil 30A wound around the side portion 20b-A to the tape surface 30d-B of the superconducting coil 30B wound around the side portion 20b-B. A leakage magnetic field φ2 in the direction X perpendicular to the surface 30d is generated.

  When the leakage magnetic field φ2 passes through the magnetic shielding coil 40, a current flows through the magnetic shielding coil 40 by electromagnetic induction, and is generated in a direction opposite to the leakage magnetic field φ2 and in a direction X perpendicular to the tape surface 30d. A cancel magnetic field φ3 is generated. For this reason, the leakage magnetic field φ2 generated on the tape surface 30d of the superconducting coil 30 is canceled and reduced.

  The magnetic field φ1 generated from the tip 20c-A of the side 20b-A of the C-type iron core 20 toward the tip 20c-B of the side 20b-B passes through the side 20b-B and the base 20a of the C-type iron core 20. Return to the side 20b-A. For this reason, there is little generation | occurrence | production of the leakage magnetic field (phi) 2 in the edge part by the side of the base 20a of both sides 20b-A and 20b-B, and the magnetic shielding coil 40 is unnecessary.

In the present embodiment, the current flowing through the superconducting coil 30 is an alternating current. In the case of an alternating current, since the magnitude and direction of the leakage magnetic field φ2 change with time, the magnetic shielding coil 40 also generates a canceling magnetic field φ3 in accordance with the leakage magnetic field φ2.
Note that the current flowing through the superconducting coil 30 may be a direct current. In this case, once a current flows through the magnetic shielding coil 40, the current continues to flow and continues to generate the canceling magnetic field φ3. The current attenuates little by little due to the resistance of the contact portion between the superconducting coil 30 and the lead wire, etc. In particular, in the case of the superconducting coil 30 and the magnetic shielding coil 40 where the flowing current is relatively large, the current is attenuated. It takes several days to do so, and the current flowing through the superconducting coil 30 is often turned on and off faster than the current flowing through the magnetic shielding coil 40 attenuates. Unless the coil is a superconducting coil, the current attenuation is not a problem.

  According to the present invention, by arranging the magnetic shielding coil 40 made of the superconducting coil 30 in the space 50 between the opposing tape surfaces 30d of the superconducting coil 30, the perpendicular direction X with respect to the tape surface 30d of the superconducting wire 30a. The leakage magnetic field φ2 component is reduced, the critical current is prevented from being lowered, and the characteristics of the superconducting coil 30 can be improved.

FIG. 2 shows a second embodiment of the present invention.
In 2nd Embodiment, the both ends of the superconducting wire 40a of the magnetic shielding coil 40 which consists of a superconducting coil are connected to the power supply device 60, without short-circuiting.
The power supply device 60 is connected to a coil power supply device 61 that excites the superconducting coils 30A and 30B wound around the C-type iron core 20. The coil power supply device 61 detects the direction of the current flowing through the superconducting coil 30. Yes. Since the direction of the leakage magnetic field φ2 is determined by the direction of the current, the power supply device 60 supplies a current to the magnetic shielding coil 40 so that the magnetic shielding coil 40 generates a canceling magnetic field φ3 that is a magnetic field φ1 opposite to the leakage magnetic field φ2. It is flowing.

Even in the present invention, the leakage magnetic flux φ2 component in the vertical direction X with respect to the tape surface 30d of the superconducting wire 30a of the superconducting coil 30 is reduced, so that the characteristic of the superconducting coil 30 is improved by preventing the reduction of the critical current. Can do.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 3 shows a third embodiment of the present invention.
In this embodiment, a pair of linear iron cores 21 having a rectangular cross section are used instead of the C-type iron core 20. Superconducting coils 30A and 30B are wound around iron cores 21A and 21B arranged in parallel with a space 50 therebetween.
The magnetic shielding coils 40 </ b> A and 40 </ b> B are respectively disposed in the spaces 50 </ b> A and 50 </ b> B on both ends 21 c side in the length direction of the pair of iron cores 21.

When a current is passed through the superconducting coils 30A and 30B, a magnetic field φ1A is generated in the direction from the tip 20c-AA of the iron core 21A to the tip 20c-BA of the iron core 21B as shown in FIG. Further, a magnetic field φ1B is generated in the direction from the tip 20c-BB of the iron core 21B to the tip 20c-AB of the iron core 21A.
Since both ends 21c of the pair of iron cores 21 are open, when a current flows through the superconducting coil 30, the superconducting coil 30A wound around the iron core 21A is placed in the space 50A on one opening side in the length direction of the iron core 21. The leakage magnetic field φ2A in the direction X perpendicular to the tape surface 30d of the superconducting coil 30 is generated in the direction of the tape surface 30d-B of the superconducting coil 30B wound around the iron core 21B from the tape surface 30d-A. Further, in the space 50B on the other opening side in the length direction of the iron core 21, a leakage magnetic field φ2B is generated in the direction opposite to the one space 50.

Therefore, by arranging the magnetic shielding coil 40 in each of the spaces 50A and 50B, a canceling magnetic field φ3 opposite to each leakage magnetic field φ2 is generated, and the vertical direction X generated on the tape surfaces 30d at both ends of the superconducting coil 30 is generated. Can be reduced.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 4 shows a fourth embodiment of the present invention.
In this embodiment, the magnetic field shielding material is composed of a rectangular parallelepiped bulk superconductor 41. The bulk superconductor 41 means an oxide superconductor in a lump (bulk shape), and RE-123 (RE: rare earth) represented by Y-123 (yttrium 123) made by a melting method is used as a material. Yes.
As shown in FIG. 4, the end portion 41 a of the bulk superconductor 41 is arranged so as to be closer to the opening side of the C-type iron core 20 than the end portion 30 b of the superconducting coil 30. That is, the end 41a of the bulk superconductor 41 protrudes from the space 50 between the opposing tape surfaces 30d of the superconducting coil 30 toward the magnetic flux path by the magnetic field φ1.

  When a leakage magnetic field φ4 perpendicular to the tape surface 30d of the superconducting coil 30 is generated in the space 50 between the opposing tape surfaces 30d of the superconducting coil 30, the bulk superconductor 41 does not pass the leakage magnetic field φ4 due to the Meissner effect. The magnetic field φ4 is guided to the magnetic flux path side by the magnetic field φ1. Due to the induction, the leakage magnetic field φ4 does not go from the tape surface 30d-A of the superconducting coil 30 in the vertical direction X to the tape surface 30d-B, but passes through the magnetic flux path side of the magnetic field φ1 and the side portion 20b of the C-type iron core 20. -B heads toward the tip 20c-B. Further, the leakage magnetic field φ4 may be directed to the tape surface 30d-B, but is directed to the tape surface 30d-B at an angle in which the component in the vertical direction X is suppressed.

Thus, by using the bulk superconductor 41 as the magnetic field shielding material, the direction of the leakage magnetic field φ4 that is the magnetic field component in the vertical direction X generated on the tape surface 30d is changed, and the tape surfaces 30d at both ends of the superconducting coil 30 are changed. The leakage magnetic field φ4 generated in the vertical direction X can be reduced.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 5 shows a fifth embodiment of the present invention.
When the superconducting coils 30A and 30B are wound around the pair of linear iron cores 21A and 21B of the third embodiment, the magnetic field shielding material is the rectangular parallelepiped bulk superconductors 41A and 41B similar to the fourth embodiment. . Further, the end 41c of the bulk superconductor 41 is disposed so as to protrude from the space 50A, 50B at both ends in the length direction of the pair of iron cores 21 to the path of the magnetic flux by the magnetic fields φ1A, φ1B.
Even in the above configuration, the leakage magnetic field φ4 in the vertical direction X generated on the tape surfaces 30d at both ends of the superconducting coil 30 can be reduced by changing the direction of the leakage magnetic field φ4.
In addition, since another structure and an effect are the same as that of 3rd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In addition, this invention is not limited to the said embodiment, The various form within the claim of this invention is included.

  The superconducting device provided with the superconducting magnet device of the present invention is used for controlling a fluid having conductivity or magnetism, and is used for, for example, electromagnetic stirring for steel.

It is a block diagram which shows 1st Embodiment of the superconducting magnet apparatus which is this invention. It is a block diagram which shows 2nd Embodiment. It is a block diagram which shows 3rd Embodiment. It is a block diagram which shows 4th Embodiment. It is a block diagram which shows 5th Embodiment. It is a figure which shows the superconducting coil of a prior art example. It is a figure which shows a magnetic field when a superconducting coil is wound around a C-type iron core. (A) (B) is a figure which shows the relationship between the direction of the magnetic field added to a superconducting wire, and a critical current.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superconducting magnet apparatus 20 C type iron core 20a Base part 20b-A, 20b-B Both sides 20c Opening side front end 21 Linear iron core 30 (30A, 30B) Superconducting coil 30a Superconducting wire 30b Opening side end 30d Tape surface 40 Magnetic shielding Coil 40a Superconducting wire 41 Bulk superconductor 50 Space 60 perpendicular to tape surface Power supply device φ1 Magnetic field φ2, φ4 Leakage magnetic field φ3 Canceling magnetic field

Claims (5)

A superconducting magnet device in which a superconducting coil wound with a superconducting wire made of a tape is arranged to face the tape surface with a space in a direction perpendicular to the tape surface, and generates a magnetic flux between axial ends of these superconducting coils. ,
A magnetic field shielding material for preventing a short circuit of magnetic flux between the tape surfaces by a magnetic field component generated in a direction perpendicular to the tape surface is disposed in a space between the opposing tape surfaces of the superconducting coil. Superconducting magnet device.   2. The superconducting magnet device according to claim 1, wherein the superconducting coil includes a pair of superconducting coils wound around both sides of a C-type iron core, and the magnetic field shielding material is disposed in the space on the opening side of the C-type iron core. .   The superconducting coil is composed of a superconducting coil wound around a pair of linear iron cores arranged in parallel with a space therebetween, and the magnetic field shielding materials are arranged in spaces at both ends in the length direction of the pair of iron cores. Item 2. The superconducting magnet device according to Item 1.   The magnetic field shielding material is a short-circuited superconducting coil or a superconducting coil connected to a power source, and the axial direction of the superconducting coil is arranged in a direction perpendicular to the tape surface, and a vertical direction generated on the tape surface. The superconducting magnet device according to any one of claims 1 to 3, wherein a magnetic field that attenuates a magnetic field component is generated.   The magnetic field shielding material is made of a bulk superconductor, and the bulk superconductor is disposed so as to protrude from the space between the tape surfaces to the magnetic flux path side, and a vertical magnetic field component generated on the tape surface is arranged on the magnetic flux path side. The superconducting magnet device according to any one of claims 1 to 3, wherein the superconducting magnet device is guided to a point.

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