JP4807841B2 - Superconducting magnet and magnetic resonance imaging apparatus - Google Patents

Description

  The present invention relates to a magnetic resonance imaging apparatus, and more particularly to the shape of a vacuum container of a superconducting magnet.

  As a magnet for a magnetic resonance imaging apparatus (MRI apparatus) that requires high image quality, a superconducting magnet is applied because a high magnetic field and a high uniform magnetic field are required. As a conventional superconducting magnet for the MRI apparatus, a cylindrical (horizontal magnetic field type) superconducting magnet is employed.

  As a known example of this cylindrical superconducting magnet, there is a technique described in Patent Document 1. In the technique described in Patent Document 1, for the purpose of downsizing a cylindrical superconducting magnet, a small helium refrigerator is disposed on an obliquely 45 ° lower surface or an obliquely 45 ° upper surface of a cylindrical vacuum vessel.

  When the cylindrical superconducting magnet is housed in the room, the superconducting vacuum vessel is inclined at a lower angle of 45 degrees or an upper surface at an angle of 45 degrees. If a small helium refrigerator is placed in this free space, In addition to being compact, the attachment and removal operations of the refrigerator are also easier than when the refrigerator is attached to the upper part of the superconducting magnet.

Japanese Patent No. 2569165

  However, in the technique described in Patent Document 1, the refrigerator can be arranged on the lower surface of the superconducting vacuum container at an angle of 45 degrees or the upper surface of the angle of 45 degrees. Since it is necessary to arrange in the atmosphere of the cryogenic refrigerant gas above the liquid level, it must be arranged at the top of the superconducting vacuum vessel. For this reason, the maintenance work of the worker was difficult.

  In addition, in an MRI apparatus using a horizontal magnetic field type cylindrical magnet, in order to improve the openness to the subject, the cylindrical bore is expanded laterally, that is, an ellipse whose major axis is horizontal and whose minor axis is vertical. It can be considered to have a cylindrical shape. When the bore shape is expanded in the lateral direction, the external shape must be an elliptical cylinder shape.

  In this case, the external shape spreads in the lateral direction from the conventional superconducting magnet, and when the position of the refrigerator, external piping, and liquid inlet is at the top of the super electric vacuum vessel, the refrigerator, external piping, liquid injection The accessibility from the side direction to the mouth becomes worse, and the workability of the worker is lowered.

  An object of the present invention is to improve installation workability and maintenance workability in a vacuum container for a magnetic resonance imaging apparatus, and to make it possible to minimize a magnet appearance size including a cover.

  The superconducting magnet of the present invention includes a superconducting coil, a cryogenic container that houses the superconducting coil and stores a cryogenic liquid refrigerant, and a cooling that cools and reliquefies the cryogenic refrigerant gas that evaporates in the cryogenic container. Machine, an external exhaust pipe for discharging the cryogenic refrigerant gas to the outside, and a liquid injection port for injecting the cryogenic liquid refrigerant into the cryogenic container, and has a cylindrical shape, the central axis of which is It arrange | positions in a horizontal direction, accommodates the said cryogenic container, and the inside is maintained in a vacuum state.

  In the superconducting magnet, a flat surface is formed in the upper portion, and at least the external exhaust pipe is disposed on the flat surface.

  Further, in the superconducting magnet of the present invention, concave portions extending from the flat surface to the lower portion can be formed on both sides of the elliptical cylindrical shape of the vacuum vessel.

  It is also possible to arrange a cooler, an external exhaust pipe, and a liquid injection port in the recess.

  In the superconducting magnet, the installation work and maintenance workability can be improved, and the external dimensions of the magnet including the cover can be minimized.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

Prior to the description of the embodiment of the present invention, a schematic configuration of the MRI apparatus will be described with reference to FIG.
In FIG. 17, an MRI apparatus includes a magnet 802 that generates a static magnetic field around a subject 801, a gradient magnetic field coil 803 that generates a gradient magnetic field in a static magnetic field space, and an RF coil that generates a high-frequency magnetic field in a static magnetic field space region. 804 and an RF probe 805 that detects an MR signal generated by the subject 801.
Here, the gradient magnetic field coil 803 is configured by gradient magnetic coils in three directions of X, Y, and Z, and each generates a gradient magnetic field in accordance with a signal from the gradient magnetic field power supply 809.

The RF coil 804 generates a high-frequency magnetic field according to the signal from the RF transmission unit 410. A signal received by the RF probe 805 is detected by a signal detection unit 806, signal processed by a signal processing unit 807, converted into an image signal by calculation, and an image is displayed on a display unit 808.
The gradient magnetic field power supply 809, the RF transmission unit 810, and the signal detection unit 806 are controlled by the control unit 811, and the control time chart is generally called a pulse sequence. The bed 812 is for the subject to lie down.

The vacuum container is a container that houses the above-described static magnetic field generating magnet of the MRI apparatus.
Next, a first embodiment of the present invention will be described.
FIG. 1 is an external perspective view of an elliptic cylindrical superconducting magnet having a vacuum vessel for an MRI apparatus according to the first embodiment of the present invention, and FIG. 2 is a schematic sectional view thereof. 1 and 2, the cylindrical superconducting magnet 1 for an MRI apparatus has a substantially elliptical cylindrical bore 11 in order to improve its openness. Further, due to the internal structure of the superconducting magnet 1, the vacuum vessel 5 has a substantially elliptical cylindrical shape. This elliptical cylindrical vacuum vessel is arranged so that its central axis is in the horizontal direction.

  Further, a service assembly including a refrigerator 7, an external exhaust pipe 8, a liquid injection port 10, and a current lead portion 9 is disposed above the elliptical cylindrical vacuum vessel 5. The arrangement positions of these services and assemblies will be described with reference to FIG. As shown in FIG. 2, the elliptic cylindrical superconducting magnet 1 surrounds the superconducting coil 2, a cryogenic container 4 that houses the superconducting coil 2 and stores a cryogenic liquid refrigerant 3, and a cryogenic container 4. A heat shield (not shown) arranged at an interval, and a cryogenic container 4 and a heat shield that surrounds the cryogenic container 4 are housed, and an elliptic cylinder-type vacuum container 5 that is maintained in a vacuum.

  Furthermore, the shape of the elliptical cylinder type vacuum vessel 5 is such that the outer surface shape is a generally elliptical cylinder shape in which the major axis is the side surface direction and the minor axis is the vertical (vertical) direction, and substantially along the central axis of the elliptic cylinder. The space part of an elliptic cylinder is provided. The oval cylindrical vacuum vessel 5 has a flat portion 12 having a substantially flat upper portion and a curved structure on a side portion.

  At least one of the service assemblies described above is disposed on the flat surface portion 12 and in the vicinity of the boundary with the side surface portion.

  FIG. 18 is a schematic perspective view showing a cylindrical vacuum vessel different from the present invention, and FIG. 19 is a schematic cross-sectional view thereof. The difference in internal structure between the cylindrical superconducting magnet shown in FIGS. 18 and 19 and the elliptical cylindrical superconducting magnet of the present invention will be described with reference to FIGS. 1 and 2 and FIGS. 18 and 19.

  In the cryogenic containers 4 and 104 inside the superconducting magnets 1 and 101 having the superconducting coils 2 and 102, the cryogenic liquid refrigerant 103 and the cryogenic refrigerant gas 6 and 106 vaporized therefrom coexist, and the cryogenic refrigerant gas 6 and 106 accumulates above the cryogenic vessel. At this time, in the case of the cylindrical superconducting magnet 101 having the cylindrical bore 111 shown in FIG. 19, near the vertical center axis 112 (one-dot chain line) of the cross section in the upper part of the cryogenic vessel 104 (the part above the broken line 113). The cryogenic refrigerant gas 106 accumulates only in the limited space.

  The cryogenic refrigerant gas 1006 is cooled and recondensed at the tip of the refrigerator 107, the tip of the external exhaust pipe 108 for discharging the cryogenic refrigerant gas 106 to the outside, and the cryogenic liquid refrigerant 103 in the cryogenic container 104. The tip of the liquid injection port 110 for liquid injection needs to be present in the cryogenic refrigerant gas 106 layer, so that the refrigerator 107, the external exhaust pipe 108, and the liquid injection port 110 are arranged in the cylindrical vacuum vessel 105. It is arranged in a narrow region almost directly above the outer surface. In FIG. 19, reference numeral 109 denotes a current lead portion.

  On the other hand, in the case of the elliptic cylindrical superconducting magnet 1 according to the present invention shown in FIGS. 1 and 2, as described above, the cryogenic vessel 4 has a generally flat structure in the upper part and a curved structure in the side part. A certain elliptic cylinder shape can be used. According to this structure, the cryogenic refrigerant gas 6 accumulates in an upper flat structure extending in the side surface direction.

  That is, in the elliptic cylindrical superconducting magnet 1, the refrigerator 7, the external exhaust pipe 8, and the liquid injection port 10 can be arranged at positions shifted in the lateral direction from the region directly above the outer surface of the vacuum vessel 5. .

  Therefore, according to the first embodiment of the present invention, when an operator performs installation work and maintenance work, access to the refrigerator 7, the external exhaust pipe 8, and the liquid injection port 10 from the side surface direction of the vacuum vessel is performed. It is easy and workability can be improved.

  In particular, even when an elliptical cylindrical magnet is used, access to the refrigerator 7, the external exhaust pipe 8, and the liquid injection port 10 from the side surface direction of the vacuum vessel 5 is easy.

  The above-described example is an example in the case where the present invention is applied to an elliptical cylindrical vacuum vessel. However, the present invention is also applied to a cylindrical vacuum vessel, and a flat surface is formed on the upper portion thereof. It is also possible to arrange the refrigerator 7, the external exhaust pipe 8, the liquid injection port 10 and the like on the surface.

Next, a second embodiment of the present invention will be described.
FIG. 3 is an external perspective view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel according to a second embodiment of the present invention, and FIG. 4 is a schematic front view thereof. 3 and 4, in order to improve the openness of the MRI apparatus, the superconducting magnet is an elliptic cylindrical superconducting magnet 201 having an elliptic cylindrical bore 11.

  Further, due to the internal structure of the superconducting magnet 201, the outer surface has an oval cylindrical shape, a flat surface is formed in the upper part, and a recess 212 (a recess extending from the flat surface to the lower part of the container 205) is formed in the side part. An approximately elliptic cylindrical vacuum vessel 205 having the formed structure is provided. Furthermore, a service assembly including a refrigerator 7, an external exhaust pipe 8, a liquid injection port 10, and a current lead portion 9 is provided above the elliptical cylindrical vacuum container 205 having a hollow structure.

  As described above, in the second embodiment, since the hollow portion (recessed portion) 212 is provided on the side surface of the elliptical cylindrical vacuum vessel 205, the elliptical cylindrical vacuum vessel 205 is disposed on the upper side of the generally elliptical cylindrical vacuum vessel 205 from the side surface direction. As a result, the workability of the worker 13 performing the installation work and the maintenance work can be improved. Reference numeral 14 denotes a work table. Further, it is considered that the workability of the worker 13 can be improved if the depression 212 is a depression having a depth of about 20 cm.

  FIG. 5 is a diagram illustrating an example of an arrangement position of a superconducting coil housed in the elliptic cylindrical superconducting magnet 201 shown in FIG. The cylindrical superconducting magnet in the prior art and the elliptic cylindrical superconducting magnet shown in FIG. 1 have the same structure as that shown in FIG. The superconducting coils housed in the cryogenic container are roughly classified into the following two types according to their roles.

  The first type is a main coil 202 that generates a uniform static magnetic field and is disposed on the imaging space (elliptical cylinder bore 11) side. The second type suppresses the magnetic field leaking to the external space of the superconducting magnet, This is a shield coil 203 disposed on the outer peripheral side of the main coil 202. As shown in FIG. 5, the main coil 202 is arranged in a distributed manner on the inner peripheral surface along the imaging space, the shield coil 203 is arranged in the vicinity of the container end portion, and the outer peripheral side central portion is relatively free. Arrangement.

  The reason why a difference appears in the arrangement of the main coil 202 and the shield coil 203 is that the main coil 202 corrects higher-order components represented by a spherical harmonic function in order to generate a uniform static magnetic field. A coil is arranged. On the other hand, the shield coil 203 is composed of a pair of coils in order to suppress an external magnetic field mainly by generating a primary component.

  As described above, since the shield coil 203 is disposed in a limited region on the outer peripheral side of the main coil 202 and has a feature of having a space portion in which the shield coil 203 is not disposed in the central portion of the outer periphery, a vacuum container corresponding to this portion. The surface of 205 can be recessed.

  The main components other than the superconducting coil inside the vacuum vessel 205 include a load support structure that supports the superconducting coil, an external pipe 8 and an internal pipe that leads to the liquid injection port 10. Avoid placing them.

  FIG. 6 is a modification of the second embodiment of the present invention, and is a diagram showing the arrangement position of the superconducting coil and the shape of the vacuum vessel 305 when the shield coil 203 is arranged in the central portion of the outer periphery of the vacuum vessel. As shown in FIG. 6, when the shield coil 203 is arranged at the center, a recess 312 is formed at the peripheral end of the vacuum vessel 305.

  Also in the example shown in FIG. 6, the distance to the service and assembly becomes short, and the workability of the worker 13 who performs the installation work and the maintenance work can be improved.

Next, a third embodiment of the present invention will be described.
FIG. 7 is an external perspective view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel 405 according to a third embodiment of the present invention, and FIG. 8 is a schematic front view thereof. In the third embodiment shown in FIGS. 7 and 8, not only is the depression (recess) 412 formed on the side surface of the elliptical cylindrical superconducting magnet, but also the depression (recess) on the top where the flat surface is formed. ) 413 is formed. Further, in the side depression 412, there are a magnet monitoring device 15 for monitoring and controlling the temperature inside the superconducting magnet, the level of the cryogenic liquid refrigerant, and the pressure, a superconducting magnet structure such as a motor drive unit of a pulse tube refrigerator, and an MRI. A part 16 of the system configuration unit of the apparatus is arranged.

  According to the third embodiment, since the depression 413 is formed in the upper part, the service assembly can be arranged at a position lower than that of the second embodiment described above. Thereby, the installation workability / maintenance workability is further improved. Further, since the device height of the superconducting magnet is reduced, the installation property of the device is further improved.

  In the configuration in the example shown in FIG. 7, the interface between the cryogenic liquid refrigerant and the cryogenic refrigerant gas is low, and therefore, the thermal design of the cryogenic container 405 in consideration of this is necessary. Although not shown, a power supply terminal block of a gradient magnetic field coil or an RF coil may be disposed in the side recess 412.

  If comprised in this way, since the cover of an apparatus should just cover the hollow parts 412,413, it becomes possible to minimize the external dimension of this cover. Further, since the system component 16 can be disposed on the outer surface of the superconducting magnet, the entire MRI apparatus can be slimmed.

  FIG. 9 is a diagram illustrating an example in which the refrigerator 7, the liquid injection port 10, and the power supply lead portion 9 in the service assembly are arranged in the depression 412 formed on the side surface in the third embodiment of the present invention. FIG. 10 is a front view of the example shown in FIG. 9 and 10, it is necessary to insert the refrigerator 7, the transfer tube, and the power supply lead 9 from the outside into the cryogenic container inside the superconducting magnet in the refrigerator 7, the liquid inlet 10, and the power supply lead 9. It is necessary to secure a work space in the height direction.

  According to the configuration shown in FIGS. 9 and 10, the position of the refrigerator 7, the external exhaust pipe 8, the liquid injection port 10, and the power supply lead portion 9 can be arranged at a lower position, so that installation and maintenance workability can be further improved. Can be improved.

Next, a fourth embodiment of the present invention will be described.
FIG. 11 is an external perspective view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel 505 according to a fourth embodiment of the present invention, and FIG. 12 is a schematic front view thereof. In the fourth embodiment of the present invention, a recess 512 (a recess extending from a flat surface to a lower portion) is formed on only one side of the side surfaces of the vacuum vessel, and the refrigerator 7 and the outside are formed in the recess 512. An exhaust pipe 8, a liquid injection port 10, a power supply lead 9, a part 16 of a system unit, and a magnet monitoring device 15 are arranged.

  In the fourth embodiment, the same effect as that of the third embodiment can be obtained, and since the recess 512 is formed only on one side surface, the vacuum container 505 can be easily manufactured and produced. Can be improved.

Next, a fifth embodiment of the present invention will be described.
FIG. 13 is an external perspective view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel 605 according to a fifth embodiment of the present invention, and FIG. 14 is a schematic front view thereof. In the fifth embodiment of the present invention, a recess (recess) 612 is formed only in a part of one side surface of the vacuum vessel (upper side of the cylindrical side surface portion). A refrigerator 7, an external exhaust pipe 8, a liquid injection port 10, a power supply lead portion 9, and a magnet monitoring device 15 are arranged.

  In the fifth embodiment, the same effect as that of the third embodiment can be obtained, and the depression 612 may be formed in a smaller area than the depression 512 in the fourth embodiment. Further, productivity can be improved. That is, the manufacturing method of manufacturing the vacuum part 512 without a hollow after the hollow part 512 is notched by fusing and joining a hollow shaped part can be considered. In this case, since it is possible to manufacture the refrigerator 7, the external exhaust pipe 8, the current lead portion 9, and the injection port 10 of the injection pipe inserted into the cryogenic container, It is possible to make the labor relatively simple.

  Further, in the fifth embodiment, the chiller 7, the external exhaust pipe 8, the liquid injection port 10, and the power supply lead portion are formed in the hollow portion 612 formed on only a part of one of the side surfaces of the vacuum vessel. 9. Since the magnet monitoring device 15 is arranged in a concentrated manner, there is an effect that it is easy to perform these maintenance operations.

  In addition, about a cover, if only the part which covers the hollow part 612 is manufactured separately and only the part corresponding to this hollow part 612 can be opened and closed, execution of maintenance work will become easier.

Next, a sixth embodiment of the present invention will be described.
FIG. 15 is an external perspective view of a cylindrical conductive magnet having an MRI apparatus vacuum vessel 705 according to a sixth embodiment of the present invention, and FIG. 16 is a schematic front view thereof. The sixth embodiment is an example when the present invention is applied to a cylindrical vacuum vessel, and a part of one side surface of the cylindrical vacuum vessel 705 (upper side of the cylindrical side surface portion). A recess (recess) 712 is formed only in the recess 712, and the refrigerator 7, the external exhaust pipe 8, the liquid inlet 10, the power supply lead 9, and the magnet monitoring device 15 are disposed in the recess 712.

  According to the sixth embodiment, workability such as maintenance work can be improved for the cylindrical vacuum container.

  As other embodiment of this invention, in the 3rd-6th embodiment mentioned above, external piping 8 is made into the side part which forms the depressions 412, 512, 612, 712, for example, the example shown in FIG. Some are arranged on the side surface portion 513 forming the recess 512.

  As described above, even when the external pipe 8 is disposed on the side surface portion 513 that forms the recessed portion, the same effect as that of the above-described embodiment can be obtained.

  As still another embodiment of the present invention, there is an MRI apparatus provided with the vacuum container of the above-described embodiment.

1 is an external perspective view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel according to a first embodiment of the present invention. 1 is a schematic front view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel according to a first embodiment of the present invention. It is an external appearance perspective view of the elliptic cylinder type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 2nd Embodiment of this invention. It is a schematic front view of the elliptic cylinder type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 2nd Embodiment of this invention. It is a figure which shows an example of the arrangement position of the superconducting coil accommodated in the inside of an elliptic cylindrical superconducting magnet. It is explanatory drawing of the modification of the 2nd Embodiment of this invention. It is an external appearance perspective view of the elliptical cylinder-type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 3rd Embodiment of this invention. It is a schematic front view of the elliptical cylinder-type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 3rd Embodiment of this invention. It is a figure which shows the example arrange | positioned in the hollow formed in the side surface in the refrigerator, the injection hole, and the power supply lead part in the 3rd Embodiment of this invention. FIG. 10 is a schematic front view of the example of FIG. 9. It is an external appearance perspective view of the elliptical cylinder-type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 4th Embodiment of this invention. It is a schematic front view of the elliptic cylinder type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 4th Embodiment of this invention. It is an external appearance perspective view of the elliptical cylinder-type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 5th Embodiment of this invention. It is a schematic front view of an elliptic cylindrical conductive magnet having an MRI apparatus vacuum vessel according to a fifth embodiment of the present invention. It is an external appearance perspective view of the elliptical cylinder-type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 6th Embodiment of this invention. It is a schematic front view of the elliptical cylinder-type conductive magnet which has the vacuum vessel for MRI apparatuses which is the 6th Embodiment of this invention. It is a schematic block diagram of an MRI apparatus. It is a schematic perspective view which shows the cylindrical vacuum vessel different from this invention. It is a schematic sectional drawing of the example shown in FIG.

Explanation of symbols

1,201 Elliptical cylindrical superconducting magnet 2 Superconducting coil 3 Cryogenic liquid refrigerant 4 Cryogenic container 5, 205, 305 Elliptical tower vacuum container 6 Cryogenic refrigerant gas 7 Refrigerator 8 External exhaust pipe 9 Current lead part 10 Injection port DESCRIPTION OF SYMBOLS 11 Bore 12 Plane part 14 Work table 15 Magnet monitoring apparatus 16 Part of system configuration unit of MRI apparatus 202 Main coil 203 Shield coil 212, 312 Recessed part 405, 505, 605 Elliptical tower type vacuum vessel 412, 413, 512 Recessed part 513 Side surface part 612,712 Indentation part 705 Cylindrical vacuum vessel

Claims (15)

A superconducting coil, a cryogenic container that houses the superconducting coil and stores cryogenic liquid refrigerant, a cooler that cools and reliquefies the cryogenic refrigerant gas that evaporates in the cryogenic container, and a cryogenic refrigerant gas An external exhaust pipe and a liquid injection port for injecting a cryogenic liquid refrigerant into the cryogenic container, and has a cylindrical shape, the central axis of which is arranged in a horizontal direction, A superconducting magnet having a vacuum container that contains a cryogenic container and whose inside is maintained in a vacuum state ,
The flat surfaces in the upper part of the vacuum container is formed, on the flat surface, the superconducting magnet at least the external exhaust pipe is arranged,
The superconducting magnet according to claim 1, wherein the vacuum vessel has an elliptic cylinder shape with a major axis in a horizontal direction and a minor axis in a vertical direction, and the flat surface is formed in an upper portion of the elliptic cylinder.   2. The superconducting magnet according to claim 1, wherein the external exhaust pipe, the cooler, and the liquid injection port are disposed on the flat surface. 3. The superconducting magnet according to claim 2, wherein the external exhaust pipe, the cooler, and the liquid injection port are disposed in the vicinity of a boundary between the flat surface and the side surface portion. . 3. The superconducting magnet according to claim 2, wherein a first hollow portion extending from the flat surface to the lower portion is formed on at least one of the elliptical cylindrical side portions of the vacuum vessel. . 5. The superconducting magnet according to claim 4 , wherein a second recess is formed in a central region of the flat surface, and the external exhaust pipe, the cooler, and the liquid injection port are disposed in the second recess . Superconducting magnet characterized by being made. 5. The superconducting magnet according to claim 4 , wherein a second recess is formed in a central region of the flat surface, the external exhaust pipe is disposed in the second recess , and at least one of the elliptical cylindrical side portions. A superconducting magnet, wherein the cooler and the liquid injection port are disposed. A superconducting magnet according to claim 6, superconducting magnet further comprising a magnet monitoring means, at least one of the elliptic cylindrical shape side portion, characterized in that the upper Symbol magnets monitoring means are arranged. A superconducting coil, a cryogenic container that houses the superconducting coil and stores cryogenic liquid refrigerant, a cooler that cools and reliquefies the cryogenic refrigerant gas that evaporates in the cryogenic container, and a cryogenic refrigerant gas An external exhaust pipe and a liquid injection port for injecting a cryogenic liquid refrigerant into the cryogenic container, and has a cylindrical shape, the central axis of which is arranged in a horizontal direction, In a superconducting magnet containing a cryogenic container and having a vacuum container whose inside is maintained in a vacuum state,
A first indentation is formed in the cylindrical side surface of the vacuum container, and the external exhaust pipe, the cooler, and the liquid injection port are arranged in the first indentation. Superconducting magnet characterized by 9. The superconducting magnet according to claim 8, wherein the vacuum vessel has an elliptic cylindrical shape having a major axis in a horizontal direction and a minor axis in a vertical direction. The superconducting magnet according to claim 9 , wherein the first hollow portion extends from an upper portion to a lower portion of the cylindrical side surface portion. The superconducting magnet according to claim 10 , further comprising magnet monitoring means arranged in the first recess . The superconducting magnet according to claim 8 or 9 , wherein the first recess is formed on an upper side of the cylindrical side surface. 13. The superconducting magnet according to claim 12, further comprising a cover that covers the first recess and is supported to be opened and closed. The superconducting magnet according to claim 10, wherein the vacuum vessel has a cylindrical shape, and a flat surface is formed in an upper part of the first recess. The superconducting magnet according to claim 14, wherein a second recess is formed in a central region of the flat surface, and the external exhaust pipe, the cooler, and the liquid injection port are disposed in the recess. A superconducting magnet characterized by that.

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