WO1997011472A1 - Aimant supraconducteur - Google Patents

Aimant supraconducteur Download PDF

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Publication number
WO1997011472A1
WO1997011472A1 PCT/JP1995/001876 JP9501876W WO9711472A1 WO 1997011472 A1 WO1997011472 A1 WO 1997011472A1 JP 9501876 W JP9501876 W JP 9501876W WO 9711472 A1 WO9711472 A1 WO 9711472A1
Authority
WO
WIPO (PCT)
Prior art keywords
superconducting
cooling
temperature
superconducting magnet
switch
Prior art date
Application number
PCT/JP1995/001876
Other languages
English (en)
Japanese (ja)
Inventor
Norihide Saho
Takeo Nemoto
Hisashi Isogami
Teruhiro Takizawa
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to PCT/JP1995/001876 priority Critical patent/WO1997011472A1/fr
Priority to JP09512564A priority patent/JP3107228B2/ja
Publication of WO1997011472A1 publication Critical patent/WO1997011472A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/04—Cooling

Definitions

  • the present invention relates to a superconducting magnet system, and more particularly, to a superconducting switch for generating a permanent current for use in a conduction-cooled superconducting magnet operated in a permanent current maintaining mode.
  • the conventional superconducting magnet system disclosed in Japanese Patent Publication No. Hei 6—7 3 3 3 4 discloses a superconducting coil that constitutes a superconducting magnet (hereinafter, referred to as a superconducting magnet unless otherwise specified).
  • An external power supply and a superconducting coil are electrically connected to allow a permanent current to flow through the superconducting coil, and a superconductor connected in parallel to the superconducting coil and a heater for cutting off the superconducting state of the superconductor are provided.
  • a superconducting switch is composed of a conductor and a heater.When current is supplied from an external power supply to the superconducting coil, the superconductor is heated by a heater and the resistance is increased to increase the resistance. It describes a technique in which a coil is electrically connected, and then a heater is turned off to restore the superconducting state of the superconductor and a permanent current is applied to both ends of the superconducting coil and the superconducting switch winding.
  • the superconducting switch when the superconducting magnet is cooled below the superconducting generation temperature by the refrigerator, current is supplied from the external power supply to the superconducting coil via the bus, but at this time, the superconducting switch is set to ⁇ 0FF ''
  • the heater of the superconducting switch is heating the superconductor, the temperature of the superconductor rises above the temperature at which superconductivity occurs, and the superconductor is in normal conduction and has an electrical resistance. Therefore, current hardly flows to the superconductor side, but flows to the superconducting magnet having zero electrical resistance, and is supplied at a predetermined current rising speed to a desired current value.
  • the heater of the superconducting switch is turned off, the superconductor is cooled by the cold heat of the refrigerator, the temperature of the superconductor is cooled below the superconducting generation temperature, the superconducting state is established, and the electric resistance is reduced to zero.
  • the current flowing through the superconducting magnet is maintained as a permanent current in a closed circuit that connects the superconductors that are also in the superconducting state and the superconductor with zero electrical resistance between the buses.
  • a quench occurs where the superconductor switches to the normal conduction state for some reason from the permanent current holding operation state where the superconducting switch is ⁇ 0N '', and Joule heat generated by the operating current in the superconductor causes heat damage. Provide sufficient heat capacity to the switch to prevent bleeding.
  • a part of the superconducting magnet is thermally coupled to a cooling station having the lowest temperature of the refrigerator. Then, the superconductor is attached to the inside of the superconducting magnet through a spacer having a small thermal conductivity such as epoxy resin at the same temperature location where the superconducting magnet is cooled, and each cooling station of the expander that cools the superconducting magnet is mounted. It describes cooling the superconductor through a copper bus bar that is thermally connected to the conductor.
  • the heater of the superconducting switch When the superconducting switch is in the “0FF” state, the heater of the superconducting switch is heating the superconductor, and the temperature of the superconductor rises above the superconducting generation temperature. For this reason, the heat energy of this heater acts as an extra heat load on the refrigerator that cools the superconducting magnet through the leading bus, and when this exceeds the refrigerating capacity of the refrigerator, the temperature at which the refrigerator can cool increases and the superconducting temperature rises. The superconducting state is destroyed when the temperature of the magnet exceeds the superconducting temperature.
  • An object of the present invention is to provide a superconducting magnet system equipped with a superconducting switch that does not impose heat load on a cooling refrigerator as much as possible.
  • the object is to provide a superconducting magnet, a power supply connected to the superconducting magnet and supplying a current, a superconducting switch connected in parallel to the superconducting magnet,
  • the cooling means is achieved by means for individually cooling the superconducting magnet and the superconducting switch.
  • a refrigerator having a cooling station at a plurality of temperatures such as a mechanical expander, for example, two temperature levels of 50 K and 5 K.
  • a mechanical expander for example, two temperature levels of 50 K and 5 K.
  • the heat load of the cooling station is small, and even when the superconducting switch is turned off, the temperature of the superconducting magnet cooled by the low-temperature cooling station does not increase, and the superconducting state of the superconducting magnet is maintained stably. Can be.
  • the superconducting switch can be turned off by generating a magnetic field that breaks the superconducting state of the superconductor with the superconducting magnet for the switch.
  • the heat load of the superconducting magnet for the switch can be cooled by the cooling station higher than the superconducting temperature of the superconducting magnet, and the heat load of the cooling station having a lower temperature coupled to the superconducting magnet becomes smaller, and the superconducting magnet becomes smaller.
  • the switch is turned off, the temperature of the superconducting magnet does not rise and the superconducting state of the superconducting magnet can be maintained.
  • FIG. 1 is a cross-sectional view illustrating the structure of a superconducting magnet system according to one embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a refrigerator applied to one embodiment of the present invention.
  • FIG. 4 is a cross-sectional view illustrating the structure of a superconducting magnet system according to another embodiment of the present invention, and FIG. 4 is a superconducting magnet system according to another embodiment of the present invention.
  • FIG. 5 is a cross-sectional view illustrating the structure of a superconducting magnet system according to another embodiment of the present invention.
  • FIG. 6 is a cross-sectional view illustrating the structure of a superconducting magnet system according to another embodiment of the present invention.
  • FIG. 7 is a cross-sectional view illustrating the structure of a superconducting magnet system, and FIG. 7 is a cross-sectional view illustrating the structure of a superconducting magnet system according to another embodiment of the present invention.
  • FIG. 1 is a vertical cross-sectional view of a vacuum insulation tube in a direction perpendicular to the longitudinal direction.
  • the superconducting magnet 1 is fixed to the bobbin 2 and arranged in the vacuum chamber 3 and is insulated from the room temperature space (outside) by vacuum.
  • the refrigerator 4 is composed of, for example, a Gifford McMahon type expander (hereinafter referred to as a GM expander).
  • the compressor 5 supplies a high-pressure gas helium through a pipe 6 and expands in the refrigerator 4 to expand the first stage.
  • Heat station 8 produces a temperature of about 50 K and second stage heat station 9 produces a temperature of about 5 5.
  • the expanded low-pressure gas helium returns to the compressor 5 through the pipe 7.
  • the bobbin 2 is thermally coupled to the second-stage heat station 9 and, for example, a copper heat conductor 10, and the superconducting magnet 1 further heats through the bobbin 2 and the copper heat conductor 10. And is cooled by the second-stage heat station 9 below the superconducting generation temperature.
  • the superconducting magnet 1 is connected to an external power supply 11 in a room temperature space and a pair of copper buses 12.
  • the bus bar 12 is connected to a terminal 15 fixed to the flange 13 of the vacuum chamber 3 via an electric insulating material 14.
  • one end of a copper bus 16 is connected to a terminal 15 and the other end is connected to a copper heat transfer member 17 cooled by a first-stage heat station 8 via an electrical insulating material 18.
  • the other end of the bus bar 19 is thermally coupled to a copper heat conductor 20 via an electrical insulator 21, and is cooled by the second-stage heat station 9.
  • the bus 19 and the superconducting magnet 1 are connected by a bus 22 made of superconducting material constituting the superconducting magnet.
  • the bus 19 is connected by a U-shaped superconductor 23 made of the same material as the bus 19, and the first heat station is used.
  • Heat transfer material fixed to copper heat transfer material 17 cooled by 8 via electrical insulating material 24 (electrically insulating material, but thermally heat transfer material) Is combined with.
  • a part of the superconductor 23 is connected to an electrically insulated heater 27, and the heater 27 is connected to a heater external power supply 28 by a lead wire 29.
  • a copper heat shield plate 3a cooled by the first-stage heat station 8 is installed so as to surround the superconducting magnet 1, the busbar 19, and the superconductor 23. It is insulated so that radiant heat from does not enter.
  • the superconducting magnet 1 When exciting the superconducting magnet 1 cooled below the superconducting temperature by the refrigerator 1, the superconducting magnet 1 is connected to the superconducting magnet from the external power supply 11 via the bus 12, terminal 15, bus 16 and bus 19 and bus 22. 1 is supplied with current.
  • the superconducting switch 26 is in the "0FF" state, and the heater 27 of the superconducting switch 26 is receiving current from the external power supply 28 and heating the superconductor 23. .
  • the temperature of the superconductor 23 rises above the superconducting generation temperature, and the superconductor shifts to the normal conduction state, and a state where electric resistance is generated. Therefore, due to this electric resistance, current hardly flows to the superconductor side, but flows to the superconducting magnet 1 having the electric resistance as a hole, and is supplied at a predetermined current rising speed to a desired current value.
  • the superconductor 23 is cooled at the first heat station 8 of the refrigerator through the electric insulating material 24 and the copper heat conductor 17. Since the temperature of the superconductor 23 becomes equal to or lower than the superconducting generation temperature, the superconducting state is restored. As a result, the electric resistance of the superconductor 23 becomes zero, and the current flowing through the superconducting magnet 1 becomes the superconductor 2 having the same electric resistance between the bus 19 and the bus 19 in the superconducting state. The inside of the closed circuit electrically connected by 3 is maintained as a permanent current.
  • the superconducting magnet 1 is connected to the second stage heater.
  • the superconductor 23 of the superconducting switch 26 is cooled by the first-stage heat station 8.
  • the heat load of the heater 27, which is heated when the superconducting switch is in the “0FF” state is absorbed by the first-stage heat station 8 having a large heat capacity.
  • the temperature rise of 9 is small, and the temperature of superconducting magnet 1 can be maintained at an extremely low temperature. Therefore, even when the superconducting switch is in the “0FF” state, the temperature of the superconducting magnet 1 can be cooled stably below the superconducting generation temperature, and the superconducting state can be maintained.
  • Fig. 2 shows a typical Gifford McMaffon expander as a mechanical expander.
  • the same reference numerals as those in FIG. 1 indicate the same components.
  • the expander 4 has a first expansion chamber 41 and a second expansion chamber 92, and these expansion chambers have a two-stage series configuration.
  • the volume of the first expansion chamber 41 having a higher temperature level is larger than that of the second expansion chamber 92 having a lower temperature level.
  • a working fluid at normal temperature and high pressure supplied from the compressor 5 at normal temperature, for example, helium gas flows through a first cold storage material 43 incorporated in a first disposable laser 42 moving up and down at a predetermined cycle in a first expansion chamber. It flows toward 4 1 and is cooled by the cold energy of the cold storage material.
  • the first cold storage material 43 is made of, for example, a copper wire mesh. A part of the low-temperature and high-pressure helium gas flowing into the first expansion chamber 43 further flows into the second cold storage material 96 built in the second displacer 95 that moves up and down. And is cooled by the cold heat of the cold storage material 96.
  • the second regenerative material 96 is made of, for example, a material filled with spherical particles such as lead and erbium nickel.
  • the high-pressure helium gas in these expansion chambers is expanded at a stretch.
  • the helium gas generates cold and the first heat connected to the expansion chamber.
  • the first stage 8 and the second heat stage 9 are cooled, and the low-temperature and low-pressure heat gas is heated while cooling the heat storage materials 43 and 96 and reaches almost normal temperature and flows into the low-pressure circuit of the compressor 5. I do.
  • both displacers move to the lower end to minimize the volume of the expansion chamber, exhaust the bleed gas to a low pressure in the expansion chamber, and complete one cycle.
  • the Gifford-Macmaphon expander 4 is composed of two independent expanders.
  • the amount of cold generated in each expansion chamber is substantially determined by the pressure difference between the before and after expansion of the helium gas and the volume of the expansion chamber, the amount of cold generated in the first expansion chamber 41 having a large expansion volume is determined by the second expansion chamber. 5 to 10 times larger than the amount of cold generated in Therefore, when a predetermined amount of heat (in this case, the sum of the amount of heat generated by the heater 27 and the amount of heat generated by the superconductor 23) is cooled by the first heat stage 8, the temperature of the second heat stage 9 rises. In the case where the same amount of heat is cooled by the second heat stage 9, the temperature can be reduced as compared with the temperature rise of the second heat stage 9.
  • a predetermined amount of heat in this case, the sum of the amount of heat generated by the heater 27 and the amount of heat generated by the superconductor 23
  • the superconducting switch 26 is cooled on the high-temperature side (first heat stage 8) of the Gifford / Macmaphon expander 4 composed of two expanders. Therefore, quenching of the superconducting magnet thermally connected to the low-temperature side (second heat stage 9) can be prevented.
  • the reason that the superconductor 23 of the superconducting switch 26 shows a superconducting state at the high temperature side is that the superconductor 23 is made of a bismuth-based high-temperature superconductor.
  • the heat transfer member 17 is made of copper.
  • the heat transfer member 17 may be made of Machiyu having a lower thermal conductivity than copper.
  • the material and shape of the electric insulating material 24 and the heat transfer member 17 may be determined so as to be higher than the temperature.
  • the superconducting magnet constructed in this way is used for nuclear magnetic resonance equipment, and is also used as a plankton, which is the source of aqua and red tide, in water as outlined below. It is also used as a magnetic separation film for separating such as.
  • a flow path 3 c is provided inside the room temperature bore 3 b and made of magnetic material in this flow path.
  • a magnetic filter 3d such as a wire mesh is placed. By doing so, a large magnetic gradient is generated on the surface of the magnetic filter 3d by the magnetic field generated by the superconducting magnet 1, so that magnetic particles mixed in the fluid flowing in the flow path can be captured and the fluid can be purified.
  • Such fluids include, for example, sewage containing flocs in which magnetic particles and impurities are integrated with a condensing agent, industrial wastewater containing solid magnetic substances, water flow containing magnetic minerals, gas containing magnetic particles, etc. There is.
  • the present conduction-cooled superconducting magnet system can provide a conduction-cooled superconducting magnet system having a stable superconducting switch that can be used in the conduction-cooled superconducting magnet operated in the permanent current maintaining mode.
  • FIG. 3 shows another embodiment according to the present invention, which is different from the embodiment shown in FIG. 1 in that a U-shaped superconducting element which is a component of the superconducting switch 26 in FIG.
  • the point is that the body 23 is constituted by a substantially linear superconductor 30.
  • the superconductor 23 is fixed to the heat transfer member 17 via an electric insulating material 27a, a heat transfer control member 27c, and a heater 27b.
  • the superconductor 23 is made of, for example, a bismuth-based high-temperature superconductor, the conductor is very brittle, so if it is processed into a U-shape, cracks and the like will be generated inside and the superconducting state cannot be stably maintained. Therefore, by forming the superconductor 23 in a linear shape as in the present embodiment, it is possible to provide a conduction-cooled superconducting magnet system having a highly reliable superconducting switch.
  • FIG. 4 shows another embodiment of the present invention.
  • the difference from the embodiment shown in FIG. 1 is that the configuration of the superconducting magnet 1 and the superconducting switch 26 using two expanders is shown. This is where the superconductors 23 of the element are cooled separately.
  • the superconducting magnet 1 is cooled to a temperature lower than the superconducting temperature at the second heat station 9a (lowest temperature) of the first expander 4a.
  • the electrical insulation material 24, the heat transfer material 25, the electrical insulation material 26, the heater 27, and the copper heat shield plate 30 are connected to the first stage heating station 8b (highest temperature) of the expander 4b.
  • the other end of bus 19, copper heat conductor 20, electrical insulation 21 and end of bus 22 (these are superconducting at the temperature of the first stage heat station 8b).
  • the superconducting switch 26 is provided by two cooling devices (expanders 4a and 4b) that are thermally completely independent of the superconducting magnet 1. Since the cooling can be performed individually, the heat that enters the superconducting magnet 1 due to conduction heat conduction through the current lead wire can be cooled by the expander 4b, and the expansion can be performed even when the superconducting switch is in the ⁇ 0FF '' state. This has the effect that the temperature of the superconducting magnet 1 cooled by the machine 4a can be stably cooled below the superconducting generation temperature and the superconducting state can be maintained stably.
  • the supply of helium gas to the expanders 4a and 4b is performed by the compressor 5.
  • the same effect can be obtained even if separate compressors are provided.
  • the expander 4a is no longer affected by the heavier gas pressure due to the thermal load fluctuation of the expander 4b, so that the temperature of the superconducting magnet 1 cooled by the expander 4a is lower than the superconducting temperature. This has the effect that the superconducting state can be maintained stably by cooling more stably.
  • FIG. 5 shows another embodiment according to the present invention.
  • the difference from the embodiment shown in FIG. 4 is that the components of the superconducting magnet 1 and the superconducting switch 26 using two expanders are used. The point is that the superconductors 23 are separately cooled.
  • the superconducting temperature of superconductor 23 in superconducting switch 26 was set to be higher than the superconducting temperature of superconducting magnet 1 and lower than the superconducting temperature of bus 19.
  • the superconducting magnet 1 is made of a niobium-titanium-based (superconducting state at 4 K) superconductor
  • the busbar 19 is made of a bismuth-based (superconducting state at 80 K) high-temperature superconducting conductor
  • the superconducting switch 2 is manufactured.
  • the superconductor 23 in 6 is made of a niobium-tin-based (superconducting state at 20 K) superconducting conductor Make.
  • the superconducting magnet 1 is cooled below the superconducting generation temperature at the second-stage heat station 9a of the first expander 4a that generates the lowest temperature.
  • the external power supply 28 and the lead wire 29 for the heater of the superconducting switch shown in FIG. 4, the compressor 5, and the pipes 6 and 7 are not shown.
  • the second superheater switch 26 is cooled by the second heat station 9b of the second expander 4b that generates the next lowest temperature after the second heat station 9a, and the highest temperature is generated.
  • the heat shield plate 30 made of copper is cooled by the first-stage heat station 8b of the second expander 4b.
  • the copper heat transfer body 17, electric insulating material 18, the end of the busbar 19, and the copper heat shield plate 30 are cooled by the first-stage heat station 8a.
  • the other end of the bus 19, the copper heat conductor 20, the electrical insulating material 21, and the end of the bus 22a are cooled by the second-stage heat station 9a.
  • the bus bar 2 2b and the superconductor 23 in the superconducting switch 26 are made of the same superconductor, and these are superconductors that become superconductive at the temperature of the first stage heater 9b. It is formed.
  • the heat load of the heater 27 heated when the superconducting switch is in the “0FF” state is absorbed by the second-stage heat station 9 b of the second refrigerator 4 b. Therefore, the influence on the first refrigerator 4a is small, the temperature rise of the second-stage heat station 9a of the first refrigerator 4a is small, and the temperature of the superconducting magnet 1 can be maintained at a very low temperature. Therefore, even when the superconducting switch is in the “0FF” state, there is an effect that the temperature of the superconducting magnet 1 can be stably cooled below the superconducting generation temperature and the superconducting state can be maintained. Also, since the second heat station 9b does not need to be cooled to a temperature of 4 K (the superconductor 23 and the bus 22 of the superconducting switch 26 are composed of a niobium-tin system). It can be cheap.
  • FIG. 6 shows another embodiment according to the present invention.
  • the difference from the embodiment shown in FIG. 5 is that the components of the superconducting magnet 1 and the superconducting switch 26 using two expanders are used.
  • the superconductors 23 are cooled separately, and the superconductors 23, busbars 19, and busbars 22 are made of bismuth-based high-temperature superconductors.
  • the point is that 23 is cooled by the first stage heating station 8b of the second expander 4b.
  • the heat shield plate 30 made of copper is cooled by the same first-stage heat station 8b.
  • the second expander has only the first-stage heat station 8b and does not have the second-stage heat station.
  • FIG. 7 shows another embodiment of the present invention, which is different from the embodiment shown in FIG. 2 in that means for breaking the superconducting state of the superconductor 23, which is a component of the superconducting switch.
  • the point is that a small superconducting coil 31 made of the same material as the superconductor 23 is used instead of the heater 27.
  • the superconducting coil 31 is molded with an epoxy resin 32 or the like and fixed to the heat transfer member 17 via the heat transfer control member 27c.
  • the superconducting coil 31 is cooled by the first-stage heat station 8.
  • the superconducting state can always be maintained.
  • the superconducting coil 31 for the switch is connected to an external power supply 33 by a bus 34.
  • the superconducting switch When the superconducting switch is set to the “0FF” state, when power is supplied to the superconducting coil 31 from the external power supply 33, a magnetic field crossing the superconductor 23 at right angles is generated, and the superconductor 23 in the magnetic field is generated.
  • the superconducting state breaks down to the normal conducting state, causing electrical resistance. In this case, heat is generated by this electric resistance, but the heater As a result, the temperature fluctuation of the first-stage heat station 8 of the refrigerator 4 is further reduced. For this reason, the temperature rise of the second-stage heat station 9 is further reduced, and the temperature of the superconducting magnet 1 can be maintained at an extremely low temperature, thereby preventing quenching.
  • the present invention is not limited to this, and is configured by a refrigerator having different low-temperature side and high-temperature side.
  • a solver type, a starling type, or a pulse tube type can be applied.
  • the superconducting magnet and the superconducting switch are cooled by a refrigerator.
  • the superconducting magnet is cooled by a 4.2 K temperature liquid crystal, and the superconducting switch is cooled to a temperature of 77 K.
  • the superconducting switch can be cooled by the cooling station whose superconducting generation temperature is higher than the superconducting generation temperature of the superconducting magnet, the heat load of the lower temperature cooling station coupled to the superconducting magnet is small. Thus, the temperature of the superconducting magnet does not rise when the superconducting switch is turned off, and the superconducting state of the superconducting magnet can be maintained.
  • the superconducting switch can be turned off by generating a magnetic field that breaks the superconducting state of the superconductor with the superconducting magnet for the switch.
  • the heat load of the superconducting magnet for the switch can be cooled by a cooling station higher than the superconducting temperature of the superconducting magnet.
  • the heat load of the low cooling station is small, the temperature of the superconducting magnet does not rise when the superconducting switch is turned off, and the superconducting state of the superconducting magnet can be maintained.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)

Abstract

La chaleur produite par un commutateur supraconducteur utilisé pour fournir du courant électrique d'origine extérieure à un aimant supraconducteur à refroidissement, de façon à le garder en permanence sous tension, n'a pas d'incidence sur ce dernier dans la mesure où le dispositif comporte deux refroidisseurs, l'un pour l'aimant supraconducteur et l'autre pour le commutateur supraconducteur. Même si l'on utilise un refroidisseur mécanique pour refroidir l'aimant et le commutateur, et qu'il en découle des différences de température, l'aimant et le commutateur restent couplés thermiquement aux sections générant des températures distinctes du refroidisseur. De ce fait, l'aimant supraconducteur peut se maintenir de façon stable en deçà de la température génératrice de supraconduction dans la mesure où l'énergie thermique dépensée pour faire fonctionner le commutateur supraconducteur ralentit notablement l'élévation de température de l'organe de refroidissement de l'aimant dans le refroidisseur même.
PCT/JP1995/001876 1995-09-20 1995-09-20 Aimant supraconducteur WO1997011472A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/JP1995/001876 WO1997011472A1 (fr) 1995-09-20 1995-09-20 Aimant supraconducteur
JP09512564A JP3107228B2 (ja) 1995-09-20 1995-09-20 超電導磁石システム

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1995/001876 WO1997011472A1 (fr) 1995-09-20 1995-09-20 Aimant supraconducteur

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WO1997011472A1 true WO1997011472A1 (fr) 1997-03-27

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140398A1 (fr) * 2009-06-05 2010-12-09 株式会社日立製作所 Aimant supraconducteur à refroidissement de réfrigérateur
JP2011082229A (ja) * 2009-10-05 2011-04-21 Hitachi Ltd 伝導冷却型超電導マグネット
CN103247406A (zh) * 2012-02-06 2013-08-14 三星电子株式会社 制冷器系统及具有该制冷器系统的超导磁体装置
WO2014096995A1 (fr) * 2012-12-17 2014-06-26 Koninklijke Philips N.V. Interrupteur de courant persistant à faible perte avec agencement de transfert de chaleur
US20160116555A1 (en) * 2014-10-23 2016-04-28 Hitachi, Ltd. Superconducting Magnet, MRI Apparatus and NMR Apparatus
GB2586821A (en) * 2019-09-04 2021-03-10 Siemens Healthcare Ltd Current leads for superconducting magnets
WO2024072382A1 (fr) * 2022-09-28 2024-04-04 General Electric Renovables España, S.L. Système de charge de champ pour aimant supraconducteur

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61214588A (ja) * 1985-03-20 1986-09-24 Hitachi Ltd 超電導装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61214588A (ja) * 1985-03-20 1986-09-24 Hitachi Ltd 超電導装置

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010140398A1 (fr) * 2009-06-05 2010-12-09 株式会社日立製作所 Aimant supraconducteur à refroidissement de réfrigérateur
CN102460610A (zh) * 2009-06-05 2012-05-16 株式会社日立制作所 制冷机冷却型超导磁铁
JP2011082229A (ja) * 2009-10-05 2011-04-21 Hitachi Ltd 伝導冷却型超電導マグネット
CN103247406A (zh) * 2012-02-06 2013-08-14 三星电子株式会社 制冷器系统及具有该制冷器系统的超导磁体装置
WO2014096995A1 (fr) * 2012-12-17 2014-06-26 Koninklijke Philips N.V. Interrupteur de courant persistant à faible perte avec agencement de transfert de chaleur
US10107879B2 (en) 2012-12-17 2018-10-23 Koninklijke Philips N.V. Low-loss persistent current switch with heat transfer arrangement
US9704630B2 (en) * 2014-10-23 2017-07-11 Hitachi, Ltd. Superconducting magnet, MRI apparatus and NMR apparatus
US20160116555A1 (en) * 2014-10-23 2016-04-28 Hitachi, Ltd. Superconducting Magnet, MRI Apparatus and NMR Apparatus
GB2586821A (en) * 2019-09-04 2021-03-10 Siemens Healthcare Ltd Current leads for superconducting magnets
WO2021043486A1 (fr) * 2019-09-04 2021-03-11 Siemens Healthcare Limited Conducteurs de courant pour aimants supraconducteurs
GB2586821B (en) * 2019-09-04 2022-04-13 Siemens Healthcare Ltd Current leads for superconducting magnets
US12073992B2 (en) 2019-09-04 2024-08-27 Siemens Healthcare Limited Current leads for superconducting magnets
WO2024072382A1 (fr) * 2022-09-28 2024-04-04 General Electric Renovables España, S.L. Système de charge de champ pour aimant supraconducteur

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