WO2013172261A1 - 超電導マグネット - Google Patents
超電導マグネット Download PDFInfo
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- WO2013172261A1 WO2013172261A1 PCT/JP2013/063141 JP2013063141W WO2013172261A1 WO 2013172261 A1 WO2013172261 A1 WO 2013172261A1 JP 2013063141 W JP2013063141 W JP 2013063141W WO 2013172261 A1 WO2013172261 A1 WO 2013172261A1
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- WIPO (PCT)
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- coil
- magnetic field
- residual magnetic
- superconducting magnet
- axial direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N60/00—Superconducting devices
- H10N60/80—Constructional details
- H10N60/81—Containers; Mountings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F2006/001—Constructive details of inductive current limiters
Definitions
- the present invention relates to a superconducting magnet, and more particularly, to a superconducting magnet having a coil portion formed by winding an oxide superconducting wire having a band-like surface.
- the superconducting magnet has a residual magnetic field due to the influence of the shielding current.
- an object of the present invention is to provide a superconducting magnet capable of suppressing a residual magnetic field.
- the superconducting magnet of the present invention has a coil part and a residual magnetic field suppressing part.
- the coil portion is formed by winding an oxide superconducting wire having a belt-like surface.
- the residual magnetic field suppression unit is disposed in the coil unit, has a through hole along the axial direction of the coil unit, and is made of a magnetic material.
- this superconducting magnet by providing the residual magnetic field suppressing part, it is possible to suppress the magnitude of the magnetic field in a state where the current application to the coil part is stopped, that is, the residual magnetic field.
- the magnetic material has a maximum magnetic permeability of 100 or more.
- the residual magnetic field suppressing unit can more sufficiently have the magnetic characteristics necessary for suppressing the residual magnetic field.
- the “maximum magnetic permeability” refers to the maximum value of the relative magnetic permeability of the magnetic material near room temperature.
- the length of the residual magnetic field suppressing portion in the axial direction is equal to or greater than the width of the strip surface of the oxide superconducting wire.
- the residual magnetic field suppression part can be arranged over the unit width of the oxide superconducting wire in the coil part.
- the length of the residual magnetic field suppressing portion in the axial direction may be half or more of the length of the coil portion in the axial direction. Thereby, a residual magnetic field suppression part can be arrange
- the length of the residual magnetic field suppressing portion in the axial direction may be equal to or longer than the length of the coil portion in the axial direction. Thereby, the residual magnetic field suppression part can be arrange
- the length of the residual magnetic field suppressing portion in the axial direction may be larger than the length of the coil portion in the axial direction.
- the residual magnetic field suppression unit may include a pipe having a thickness of 1 mm or more. By setting the thickness to 1 mm or more, the residual magnetic field can be more sufficiently suppressed.
- the residual magnetic field suppressing unit may include a first part having a through hole and a second part surrounding the first part away from the first part. Thereby, when a higher magnetic field is handled, the residual magnetic field can be suppressed more effectively.
- the residual magnetic field suppressing part may constitute a part of a container that houses the coil part.
- the residual magnetic field suppression unit does not constitute a part of the container, it is necessary to provide both the residual magnetic field suppression unit and the container that can maintain the function independently of the residual magnetic field suppression unit inside the coil unit. . Therefore, the ratio occupied by the residual magnetic field suppression unit and the container in the volume inside the coil unit increases. As a result, the space in which the magnetic field can actually be used becomes small inside the coil portion, or the coil portion needs to be enlarged in order to maintain the size of this space.
- the residual magnetic field suppression part comprises a part of container, the residual magnetic field suppression part also has a function as a part of container within a coil part.
- the ratio occupied by the residual magnetic field suppression unit and the container in the volume inside the coil unit is suppressed.
- the space in which the magnetic field can actually be used can be increased inside the coil portion, or the coil portion can be reduced while maintaining the size of this space.
- the phrase “residual magnetic field suppression unit constitutes a part of the container” means that it constitutes an indispensable part for maintaining the function of the container to achieve the purpose of the container.
- the purpose of the container is to keep the temperature of the coil part low so that the coil part is kept in a superconducting state.
- room temperature for example, liquid nitrogen or liquid helium
- the function of the container is to hold the liquid in a liquid state for a practically sufficient time. It is.
- the function as the container is to hold the coil part in the vacuum.
- the container does not lose its function even if the residual magnetic field suppression unit is removed, it cannot be said that the residual magnetic field constitutes a part of the container.
- the residual magnetic field suppression unit when a residual magnetic field suppression unit is added to a container that already has the above function, it cannot be said that the residual magnetic field constitutes a part of the container.
- the coil portion and the residual magnetic field suppressing portion have a common center position in at least one radial direction of the coil portion.
- produces a magnetic field
- the coil part and the residual magnetic field suppressing part have a common center position in the axial direction of the coil part.
- produces a magnetic field
- the superconducting magnet further includes a shield having a hollow portion for accommodating the coil portion and made of a magnetic material, and the coil portion and the shield have a common center position in at least one radial direction of the coil portion.
- produces a magnetic field, it can avoid generating the force which produces a relative displacement between a coil part and a shield in radial direction between both.
- the superconducting magnet further includes a shield having a hollow portion for accommodating the coil portion and made of a magnetic material, and the coil portion and the shield have a common center position in the axial direction of the coil portion.
- produces a magnetic field
- the residual magnetic field can be suppressed.
- FIG. 4 is a partially enlarged view of FIG. 1, and is a schematic cross-sectional view taken along line II-II of FIG.
- FIG. 3 is a schematic plan view of FIG. 2.
- FIG. 5 is a schematic sectional view taken along line VV in FIG. 4.
- FIG. 10 is a schematic sectional view taken along line XX in FIG. 9. It is a graph which shows roughly the relationship between each of the thickness and the number of a residual magnetic field suppression part, and a residual magnetic field.
- 6 is a diagram illustrating a magnetic field distribution of a comparative example with respect to Example 1.
- FIG. It is a figure which shows magnetic field distribution in case the thickness of the residual magnetic field suppression part in Example 1 is 0.5 mm.
- FIG. 6 is a diagram showing a magnetic field distribution of a comparative example with respect to Example 2.
- FIG. It is a figure which shows magnetic field distribution in case the thickness of the residual magnetic field suppression part in Example 2 is 1 mm. It is a figure which shows magnetic field distribution in case the thickness of the residual magnetic field suppression part in Example 2 is 10 mm.
- FIG. 22 is a schematic plan view of FIG. 21. It is sectional drawing which shows schematically the structure of the superconducting coil which the superconducting magnet in Embodiment 7 of this invention has.
- FIG. 24 is a schematic plan view of FIG. 23. It is a schematic sectional drawing which shows the modification of FIG.
- superconducting magnet 100 of the present embodiment includes a superconducting coil 91, a heat insulating container 111, a cooling device 121, a hose 122, a compressor 123, a cable 131, and a power supply 132.
- the heat insulating container 111 contains the superconducting coil 91.
- a magnetic field application region SC for accommodating a sample (not shown) to which a magnetic field is applied is provided in the heat insulating container 111 so as to penetrate the heat insulating container 111.
- the cooling device 121 has a cooling head 20.
- the superconducting coil 91 has a coil portion 10, a pipe portion 81 (residual magnetic field suppressing portion), and an attachment portion 71.
- the coil unit 10 includes a double pancake coil 11 and a heat transfer plate 31.
- the double pancake coil 11 is laminated along the axial direction Aa of the coil portion 10.
- the radial direction Ar corresponds to a direction perpendicular to the axial direction Aa.
- the cooling head 20 of the cooling device 121 is connected to the double pancake coil 11 by the heat transfer plate 31 so that the double pancake coil 11 can be cooled.
- the material of the heat transfer plate 31 is a non-magnetic material, and specifically has a maximum magnetic permeability of less than 100.
- the material of the heat transfer plate 31 is preferably a material having high thermal conductivity and flexibility.
- the material of the heat transfer plate 31 is, for example, aluminum (Al) or copper (Cu).
- the purity of Al or Cu is preferably 99.9% or more.
- a magnetic flux MF is generated when a superconducting current flows through the cooled double pancake coil 11.
- the pipe part 81 has a through hole HL along the axial direction Aa of the coil part 10.
- the pipe part 81 includes a pipe having a wall thickness of 1 mm or more.
- the pipe portion 81 is disposed in the coil portion 10.
- the pipe part 81 is disposed so that the center of the pipe part 81 coincides with the center CP of the coil part 10.
- the pipe part 81 is made of a magnetic material, and specifically has a maximum magnetic permeability of 100 or more.
- the magnetic body forming the pipe portion 81 is, for example, iron, electromagnetic soft iron, electromagnetic steel, permalloy alloy, or amorphous magnetic alloy.
- the maximum magnetic permeability of iron is generally about 5000.
- the length of the pipe portion 81 in the axial direction Aa is equal to or greater than the width of the strip surface SF of the oxide superconducting wire 14 (half the height of each double pancake coil 11 in FIG. 2).
- the length of the pipe portion 81 in the axial direction Aa is not less than the height of each double pancake coil 11.
- the length of the pipe part 81 in the axial direction Aa may be half or more of the length of the coil part 10 in the axial direction Aa. More preferably, the length of the pipe part 81 in the axial direction Aa is not less than the length of the coil part 10 in the axial direction Aa. More preferably, as shown in FIG. 2, the length of the pipe portion 81 in the axial direction Aa is larger than the length of the coil portion 10 in the axial direction Aa.
- the pipe part 81 is attached to the coil part 10 by the attachment part 71.
- a portion of the pipe portion 81 that protrudes from the coil portion 10 is fixed to the coil portion 10 by the attachment portion 71.
- the material of the attachment portion 71 is a non-magnetic material, and specifically has a maximum magnetic permeability of less than 100.
- each of the double pancake coils 11 constituting the coil portion 10 has pancake coils 12a and 12b.
- the pancake coils 12a and 12b are stacked on each other.
- Each of pancake coils 12 a and 12 b is formed by winding oxide superconducting wire 14.
- oxide superconducting wire 14 has a tape-like shape, in other words, a belt-like shape, and thus has a belt-like surface SF.
- the band-shaped surface SF has a width Dw along the axial direction Aa and a thickness Dt smaller than the width Dw.
- the thickness Dt is about 0.2 mm and the width Dw is about 4 mm.
- the oxide superconducting wire 14 has a Bi-based superconductor extending in the extending direction, and a sheath covering the superconductor.
- the sheath is made of, for example, silver or a silver alloy.
- the oxide superconducting wire 14 has such characteristics that the AC loss increases as a magnetic field (vertical magnetic field) perpendicular to the band-shaped surface SF is applied.
- the winding direction Wa of the oxide superconducting wire 14 in the pancake coil 12a is opposite to the winding direction Wb of the oxide superconducting wire 14 in the pancake coil 12b.
- the end portion ECi of the oxide superconducting wire 14 located on the inner peripheral side of the pancake coil 12a and the end portion ECi of the oxide superconducting wire located on the inner peripheral side of the pancake coil 12b are electrically connected to each other. ing.
- the coils 12a and 12b are connected in series with each other.
- the ends ECo of the double pancake coils 11 that are adjacent to each other (the one that is adjacent in the vertical direction in FIG. 2) are electrically connected to each other. Thereby, the double pancake coils 11 are connected in series with each other.
- the pipe portion 81 (FIG. 2), the magnitude of the magnetic field in a state where the current application to the coil portion 10 is stopped, that is, the residual magnetic field can be suppressed.
- the magnetic body has a maximum magnetic permeability of 100 or more.
- the pipe part 81 can have more sufficient magnetic characteristics required for suppression of a residual magnetic field. An example of suppressing the residual magnetic field will be described later.
- the length of the pipe portion 81 in the axial direction Aa (the length in the vertical direction in FIG. 2) is equal to or greater than the width Dw (FIG. 5) of the strip surface SF of the oxide superconducting wire 14.
- the pipe part 81 can be arranged in the coil part 10 over the width Dw of the oxide superconducting wire 14.
- the length of the pipe part 81 in the axial direction Aa may be half or more of the length of the coil part 10 in the axial direction Aa.
- the pipe part 81 can be arranged over half or more of the coil part 10.
- the length of the pipe part 81 in the axial direction Aa may be equal to or longer than the length of the coil part 10 in the axial direction Aa.
- the pipe part 81 can be arrange
- the length of the pipe part 81 in the axial direction Aa may be larger than the length of the coil part 10 in the axial direction Aa. Accordingly, the pipe portion 81 can be protruded from the coil portion 10 while being arranged over the entire coil portion 10. Since the pipe part 81 protrudes, the pipe part 81 can be more easily fixed using the attachment part 71 (FIG. 2).
- the pipe portion 81 may include a pipe having a wall thickness TS (FIG. 3) of 1 mm or more. By setting the thickness TS to 1 mm or more, the residual magnetic field can be more sufficiently suppressed.
- superconducting magnet 100 ⁇ / b> A of the present embodiment has a superconducting coil 91 ⁇ / b> A and a pipe portion 81.
- Superconducting coil 91A has a configuration in which pipe portion 81 of superconducting coil 91 (FIG. 2) is omitted.
- the pipe portion 81 is disposed along the side wall of the magnetic field application region SC outside the heat insulating container 111. In the present embodiment, the end of the pipe portion 81 protrudes from the magnetic field application region SC. The end of the pipe portion 81 is attached to the heat insulating container 111 by the attachment portion 71.
- superconducting magnet 100D of the present embodiment has a superconducting coil 91D and a heat insulating container 111D.
- the superconducting coil 91D has a configuration in which the heat transfer plate 31 of the superconducting coil 91 is omitted.
- the heat insulating container 111D is configured so that a refrigerant such as liquid nitrogen can be injected.
- the superconducting coil 91D is cooled by this refrigerant. That is, in the present embodiment, the coil unit 10 can be directly cooled not by the cooling device 121 (FIG. 2) but by the refrigerant. Since the configuration other than the above is substantially the same as the configuration of the first embodiment described above, the same or corresponding elements are denoted by the same reference numerals, and description thereof is not repeated.
- the superconducting magnet of the present embodiment has a pipe portion 81M instead of the pipe portion 81 described above.
- the pipe portion 81M has an inner peripheral pipe 81a (first portion) and an outer peripheral pipe 81b (second portion).
- the inner peripheral pipe 81a has a through hole HL.
- the outer peripheral pipe 81b is separated from the inner peripheral pipe 81a and surrounds the inner peripheral pipe 81a.
- a gap GP is provided between the outer surface of the inner peripheral pipe 81a and the inner surface of the outer peripheral pipe 81b.
- the pipe portion 81M has a thickness TH (FIG.
- the reduction rate RT of the residual magnetic field due to the provision of the pipe portion is shown for each of the case where the gap GP is provided (solid line) and the case where the gap GP is not provided (broken line).
- the thickness TH is sufficiently large, the effect of reducing the residual magnetic field can be further increased when the gap GP is provided as in the present embodiment.
- the gap GP is provided as in the present embodiment. Is preferred. Thereby, when a higher magnetic field is handled, the residual magnetic field can be suppressed more effectively.
- the pipe portion 81M having a double structure including the inner peripheral pipe 81a and the outer peripheral pipe 81b has been described.
- a multiple structure including three or more pipes may be used. In this case, the residual magnetic field can be more effectively suppressed when a higher magnetic field is handled.
- a filling portion made of a non-magnetic material that fills the gap GP may be provided.
- the inner peripheral pipe 81a and the outer peripheral pipe 81b can be fixed to each other. Moreover, it can prevent that both contact by the displacement of the inner peripheral pipe 81a and the outer peripheral pipe 81b under a strong magnetic field.
- Each of the inner peripheral pipe 81a and the outer peripheral pipe 81b may be fixed by a member that is substantially the same as the attachment portion 71 (FIG. 2 or FIG. 7). In this case, the filling portion may not be provided.
- superconducting magnet 100B of the present embodiment has a heat insulating container 111B (container) that houses coil portion 10 of superconducting coil 91A.
- the heat insulating container 111 ⁇ / b> B includes a container main body 111 ⁇ / b> A and a pipe portion 81. Therefore, the pipe part 81 comprises a part of heat insulation container 111B.
- the pipe part 81 constitutes a part of the heat insulating container 111B
- the pipe part 81 constitutes an indispensable part for maintaining the function of the heat insulating container 111B for achieving the purpose of the heat insulating container 111B.
- the purpose of the heat insulating container 111B is to keep the temperature of the coil part 10 low so that the coil part 10 is kept in a superconducting state. In order to achieve this purpose, it is a function of the heat insulating container 111B to hold the coil part 10 in a vacuum so that a vacuum for heat insulation between the outside world and the coil part 10 is maintained.
- the magnetic field application region SC that communicates with the outside world and the inside of the heat insulating container 111 ⁇ / b> B are at least partially separated by the pipe portion 81 alone. Therefore, if the pipe part 81 is removed, the vacuum of the heat insulating container 111B is broken, so that the function of the heat insulating container 111B as a vacuum container is lost.
- the function of the pipe part 81 and the pipe part 81 is maintained independently of the inside of the coil part 10. It is necessary to provide both the heat insulating container 111 which can do. Therefore, the ratio occupied by the pipe portion 81 and the heat insulating container 111 in the volume inside the superconducting coil 91A increases. As a result, the space (corresponding to the magnetic field application region SC) in which the magnetic field can be actually used is reduced in the superconducting coil 91A, or the superconducting coil 91A needs to be enlarged in order to maintain the size of this space. There is.
- the pipe portion 81 also has a function as a part of the heat insulating container 111B inside the superconducting coil 91A. Therefore, the ratio occupied by the heat insulating container 111B in the volume inside the superconducting coil 91A is suppressed. As a result, the magnetic field application region SC can be increased, or the superconducting coil 91A can be reduced while maintaining the size of the magnetic field application region SC.
- the heat insulating container 111B may have an attachment part 72 for attaching the pipe part 81 to the container main body part 111A.
- the attachment portion 72 may have an O-ring that comes into contact with the container main body 111A in order to maintain the confidentiality of the heat insulating container 111B.
- the heat insulating container 111B having a function as a vacuum container is used.
- the container is not limited to the vacuum container, and the coil part 10 is held so that the coil part 10 is maintained in a superconducting state. Any material can be used as long as it achieves the purpose of keeping the temperature at a low level.
- a container that holds a liquid having a temperature below room temperature eg, liquid nitrogen or liquid helium
- Such a container only needs to hold this liquid in a liquid state for a practically sufficient time.
- the superconducting magnet of the present embodiment has substantially the same configuration as the superconducting magnet 100 (FIG. 1) of the first embodiment, and the coil portion 10 and the pipe portion 81 are relatively in a specific positional relationship. Hereinafter, this positional relationship will be described.
- the coil portion 10 and the pipe portion 81 have a common center position Ca in the axial direction Aa of the coil portion 10.
- the coil portion 10 and the pipe portion 81 have a common center position Cr. Have one .
- a virtual axis (indicated by a broken line in FIG. 22) passing through the center position Cr 1 along the radial direction Ar 1 is a symmetry axis of each of the coil portion 10 and the pipe portion 81.
- the coil portion 10 and the pipe portion 81 have a common center position Cr 2 .
- a virtual axis (indicated by a broken line in FIG. 22) passing through the center position Cr 2 along the radial direction Ar 2 is a symmetry axis of each of the coil portion 10 and the pipe portion 81.
- the position where the two symmetry axes (two broken lines in FIG. 22) intersect is the center point Cr.
- the coil portion 10 and the pipe portion 81 have a common center point Cr in plan view.
- coil portion 10 and the pipe section 81, the center position Ca, not all of Cr 1 and Cr 2 a structure may be employed to share only one or two of these.
- the dimensional error of the coil portion in that direction is preferably about 10% or less, more preferably about 5% or less.
- superconducting magnet 100C of the present embodiment further includes passive shield 99 (shield) in addition to the configuration of superconducting magnet 100A (FIG. 7).
- the passive shield 99 is for preventing unnecessary leakage of the magnetic field to the outside of the superconducting magnet 100C.
- the passive shield 99 has a hollow portion that houses the coil portion 10 and has, for example, a cylindrical shape.
- the passive shield 99 is made of a magnetic material.
- the magnetic body preferably has a maximum magnetic permeability of 100 or more.
- the passive shield 99 is fixed to the heat insulating container 111. This fixing can be performed by, for example, the mounting portion 73.
- the coil part 10 and the passive shield 99 have a common center position Ca. Thereby, when the coil part 10 generate
- the coil portion 10 and the passive shield 99 have a common center position Cr. Have one .
- An imaginary axis (indicated by a broken line in FIG. 24) passing through the center position Cr 1 along the radial direction Ar 1 is a symmetry axis of each of the coil portion 10 and the passive shield 99.
- the coil portion 10 and the passive shield 99 have a common center position Cr 2 .
- An imaginary axis (indicated by a broken line in FIG. 24) passing through the center position Cr 2 along the radial direction Ar 2 is a symmetry axis of each of the coil portion 10 and the passive shield 99.
- the position where the two symmetry axes (two broken lines in FIG. 24) intersect is the center point Cr.
- the coil unit 10 and the passive shield 99 have a common center point Cr in plan view. Thereby, when the coil part 10 generate
- a configuration may be used in which the coil unit 10 and the passive shield 99 share only one or two of the center positions Ca, Cr 1 and Cr 2 instead of all of them.
- the passive shield 99 is arranged as described above with respect to the superconducting magnet of the sixth embodiment, the symmetry as a magnetic circuit is further improved. Thereby, it is possible to further avoid the generation of a force that causes a relative displacement among the coil part 10, the pipe part 81, and the passive shield 99.
- the dimensional error of the coil portion in that direction is preferably about 10% or less, more preferably about 5% or less.
- the attachment part for fixing the passive shield 99 is limited to what is arrange
- a mounting portion 74 disposed between the heat insulating container 111B and the passive shield 99 may be used like the mounting portion 74 in the superconducting magnet 100E (FIG. 25).
- FIGS. 12 to 14 is a comparative example (in which the pipe is omitted), an example in which the thickness of the pipe part 81 is 0.5 mm, and the example in which the thickness of the pipe part is Shows the distribution of the residual magnetic field (T) corresponding to a thickness of 1 mm. From this result, it was found that the residual magnetic field was reduced in the example as compared with the comparative example. It has also been found that the effect is obtained when the thickness of the pipe portion 81 is 0.5 mm, and that a greater effect is obtained when the thickness is 1 mm.
- the inner diameter of the double pancake coil 11 (FIG. 4) was 200 mm, the outer diameter was 280 mm, the height was 10 mm, and the number of turns was 290.
- the number of stacked double pancake coils 11 in the coil portion 10 (FIG. 2) was 20.
- the thickness of the heat transfer plate 31 was 1 mm.
- SS400 JIS standard
- the outer diameter of the pipe part 81 was 150 mm, and length was 480 mm.
- the coil unit 10 is cooled to a temperature of 20K by the cooling device 121 (FIG. 1), and the current in the on state is assumed to be 225A.
- the magnetic field in the on state was 5T.
- FIGS. 15 to 17 is a comparative example (in which the pipe is omitted), an example in which the thickness of the pipe portion 81 is 1 mm, and the embodiment in which the thickness of the pipe portion is 10 mm.
- the distribution of the residual magnetic field (T) corresponding to that of FIG. From this result, it was found that the residual magnetic field was reduced in the example as compared with the comparative example. It was also found that the effect was obtained when the thickness of the pipe portion 81 was 1 mm, and that a greater effect was obtained when the thickness was 10 mm.
- the embodiment corresponds to the second embodiment and is suitable for generating a relatively low magnetic field at a coil operating temperature of 77 K by the cooling device 121 and the cooling device.
- 121 shows the respective simulation results with the example when the coil operating temperature is suitable for generating a relatively high magnetic field at a coil operating temperature of 20K.
- the “comparative example” in the table indicates the result when the pipe portion 81 is not provided.
- the thickness of the pipe portion 81 necessary to remove most of the residual magnetic field depends remarkably on the magnitude of the magnetic field (ON magnetic field) generated by the superconducting magnet 100A (FIG. 7) in the ON state. I understood it. Specifically, it was found that the thickness was about 1 mm below the ON magnetic field of 1T, and most of the residual magnetic field was removed at about 10 mm above the ON magnetic field of 5T.
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Abstract
Description
図1を参照して、本実施の形態の超電導マグネット100は、超電導コイル91と、断熱容器111と、冷却装置121と、ホース122と、コンプレッサ123と、ケーブル131と、電源132とを有する。断熱容器111は超電導コイル91を収めている。本実施の形態においては、磁場が印加される試料(図示せず)を収めるための磁場印加領域SCが、断熱容器111を貫くように断熱容器111に設けられている。冷却装置121は冷却ヘッド20を有する。
図7を参照して、本実施の形態の超電導マグネット100Aは超電導コイル91Aおよびパイプ部81を有する。超電導コイル91Aは、超電導コイル91(図2)のパイプ部81が省略された構成を有する。パイプ部81は、断熱容器111の外部において磁場印加領域SCの側壁に沿って配置されている。本実施の形態においては、パイプ部81の端が磁場印加領域SCから突出している。またパイプ部81の端は取付部71によって断熱容器111に取り付けられている。
図8を参照して、本実施の形態の超電導マグネット100Dは超電導コイル91Dおよび断熱容器111Dを有する。超電導コイル91Dは、超電導コイル91の伝熱板31が省略された構成を有する。断熱容器111Dは、液体窒素などの冷媒が注入され得るように構成されている。この冷媒により超電導コイル91Dが冷却される。すなわち本実施の形態においてはコイル部10が冷却装置121(図2)によってではなく冷媒によって直接冷却され得る。なお、上記以外の構成については、上述した実施の形態1の構成とほぼ同じであるため、同一または対応する要素について同一の符号を付し、その説明を繰り返さない。
図9および図10を参照して、本実施の形態の超電導マグネットは、前述したパイプ部81の代わりにパイプ部81Mを有する。パイプ部81Mは内周パイプ81a(第1の部分)および外周パイプ81b(第2の部分)を有する。内周パイプ81aは貫通孔HLを有する。外周パイプ81bは内周パイプ81aから離れて内周パイプ81aを囲んでいる。内周パイプ81aの外面と外周パイプ81bの内面との間には隙間GPが設けられている。言い換えれば、パイプ部81Mは、最外面と最内面との間において厚さTH(図10)を有し、かつこの厚さTHの部分の内部に隙間GPが設けられている。なお、上記以外の構成については、上述した実施の形態1~3のいずれかの構成とほぼ同じであるため、同一または対応する要素について同一の符号を付し、その説明を繰り返さない。
図20を参照して、本実施の形態の超電導マグネット100Bは、超電導コイル91Aのコイル部10を収める断熱容器111B(容器)を有する。断熱容器111Bは、容器本体部111Aおよびパイプ部81によって構成されている。よってパイプ部81が断熱容器111Bの一部を構成している。
本実施の形態の超電導マグネットは、実施の形態1の超電導マグネット100(図1)とほぼ同様の構成を有し、さらにコイル部10とパイプ部81とが相対的に特定の位置関係にある。以下、この位置関係について説明する。
図23を参照して、本実施の形態の超電導マグネット100Cは、超電導マグネット100A(図7)の構成に加えてさらに、パッシブシールド99(シールド)を有する。パッシブシールド99は、超電導マグネット100Cの外部への不必要な磁場の漏洩を防止するためのものである。パッシブシールド99はコイル部10を収める空洞部を有し、たとえば筒状の形状を有する。パッシブシールド99は磁性体から作られている。磁性体は100以上の最大透磁率を有することが好ましい。パッシブシールド99は断熱容器111に固定されている。この固定は、たとえば取付部73によって行い得る。
Claims (13)
- 帯状面を有する酸化物超電導線が巻き回されることによって形成されたコイル部と、
前記コイル部の中に配置され、前記コイル部の軸方向に沿った貫通孔を有し、磁性体から作られた残留磁場抑制部とを備える、超電導マグネット。 - 前記磁性体は100以上の最大透磁率を有する、請求項1に記載の超電導マグネット。
- 前記軸方向における前記残留磁場抑制部の長さは、前記酸化物超電導線の前記帯状面の幅以上である、請求項1または2に記載の超電導マグネット。
- 前記軸方向における前記残留磁場抑制部の長さは、前記軸方向における前記コイル部の長さの半分以上である、請求項1または2に記載の超電導マグネット。
- 前記軸方向における前記残留磁場抑制部の長さは、前記軸方向における前記コイル部の長さ以上である、請求項1または2に記載の超電導マグネット。
- 前記軸方向における前記残留磁場抑制部の長さは、前記軸方向における前記コイル部の長さよりも大きい、請求項1または2に記載の超電導マグネット。
- 前記残留磁場抑制部は、1mm以上の肉厚を有するパイプを含む、請求項1~6のいずれか1項に記載の超電導マグネット。
- 前記残留磁場抑制部は、前記貫通孔を有する第1の部分と、前記第1の部分から離れて前記第1の部分を囲む第2の部分とを有する、請求項1~7のいずれか1項に記載の超電導マグネット。
- 前記残留磁場抑制部は、前記コイル部を収める容器の一部を構成している、請求項1~8のいずれか1項に記載の超電導マグネット。
- 前記コイル部の少なくとも1つの径方向において前記コイル部および前記残留磁場抑制部は共通の中心位置を有する、請求項1~9のいずれか1項に記載の超電導マグネット。
- 前記コイル部の軸方向において前記コイル部および前記残留磁場抑制部は共通の中心位置を有する、請求項1~10のいずれか1項に記載の超電導マグネット。
- 前記コイル部を収める空洞部を有し磁性体から作られたシールドをさらに備え、
前記コイル部の少なくとも1つの径方向において前記コイル部および前記シールドは共通の中心位置を有する、請求項1~11のいずれか1項に記載の超電導マグネット。 - 前記コイル部を収める空洞部を有し磁性体から作られたシールドをさらに備え、
前記コイル部の軸方向において前記コイル部および前記シールドは共通の中心位置を有する、請求項1~11のいずれか1項に記載の超電導マグネット。
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KR1020147034774A KR102059704B1 (ko) | 2012-05-14 | 2013-05-10 | 초전도 마그넷 |
US14/390,158 US20150080224A1 (en) | 2012-05-14 | 2013-05-10 | Superconducting magnet |
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WO2019229947A1 (ja) * | 2018-05-31 | 2019-12-05 | 三菱電機株式会社 | 超電導マグネット |
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US20150080224A1 (en) | 2015-03-19 |
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JP2013258390A (ja) | 2013-12-26 |
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US20160365183A1 (en) | 2016-12-15 |
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