JP2956453B2 - Superconducting magnet device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnet device used for a medical magnetic resonance diagnostic apparatus, for example, and more particularly to an improvement of a bobbin forming a part of a helium tank.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a main part of a conventional superconducting magnet apparatus of this type, in which a winding frame is integrated. In the figure, reference numeral 1 denotes a cylindrical superconducting coil 1a to 1c.
The first superconducting coil group 2 comprises a cylindrical body 2a.
The first superconducting coil group 1 is wound around the
In the first winding frame in which b and 2c are formed, reference numeral 2d denotes a support portion of the superconducting first coil group 1 in the axial direction. Reference numeral 3 denotes a superconducting second coil group composed of the same cylindrical superconducting coils 3a and 3b disposed substantially concentrically outside the superconducting first coil group 1, and 4 denotes a body 2
A second winding frame in which superconducting second coil group 3 is wound around body portion 4a having a diameter larger than a and flange portions 4b and 4c are formed at both ends, and reference numeral 4d denotes an axial support portion of second superconducting second coil group 3. .
5 Each diameter D ₁ and D ₂ of the weld portion 5 welded portion of the flange portion 2b and 4b and 2c and 4c are substantially equal. 6 is the flange 4
This is an outer cylinder welded to the outer peripheral edges of b and 4c. In addition,
X indicates the axis of the coil group, and Y indicates the center plane of the superconducting magnet perpendicular to the axis X of the coil group. Such superconducting first
The coil group 1 and the second superconducting coil group 3 usually have a center plane Y
Are arranged symmetrically with respect to. As a configuration process of the superconducting magnet device configured as described above, first, the first winding frame and the second winding frame around which the superconducting coil is wound are combined and positioned so as to be concentric. The welding of the welding portion 5 is performed. The most important helium tank that forms the superconducting magnet by welding the outer cylinder 8 to the integrated winding frame is completed.

Next, the operation will be described. In the vicinity of the origin (γ, θ is 0), which is the target region of the superconducting magnet device, the first superconducting first coil group having the coil radius a1 forms the first.
The magnetic field is calculated using the Legendre function Pn (u) as follows: Bz1 (γ, θ) = Bz1 (0, 0) ｛1 + ε1 (γ / a1) P1 (u) + ε2 (γ / a1) ² P2 (u) + ε3 (γ / A1) ³ P3 (u) +...｝ (1) Similarly, the coil radius a2 and the second magnetic field generated by the superconducting second coil group are Bz2 (γ, θ) = Bz2 (0,0) ｛1 + ε1 (γ / a2) P1 (u) + ε2 (γ / a2) ² P2 (u) + ε3 (γ / a2) ³ P3 (u) +...｝ (2) Normally, since both the first coil group and the second coil group are constituted by coils arranged symmetrically with respect to the center plane, odd-order terms (ε1, ε3...) In the above equations (1) and (2) are used. ) Can be regarded as zero for both the first magnetic field and the second magnetic field. Each coil constituting the first coil group and the second coil group generates a uniform magnetic field near the origin, so that even-order terms (ε2,
ε4 ...) so that when they are superimposed on each other,
Design the coil shape, layout and ampere-turn. However, at the time of manufacturing the magnet, the superconducting first coil group and the second coil group are integrated with great care so as to be concentric and coaxial. In the case of a superconducting magnet, the winding frame also functions as a helium tank filled with liquid helium for holding the coil in a superconducting state. Therefore, when the winding frames are integrated, as shown in FIG. 5, the flange portions 2b and 2c of the first winding frame and the flange portions 4b and 4b of the second winding frame do not leak helium.
4c is joined to a portion indicated by a welded portion 5 having high reliability against leakage.

[0004]

Since the conventional superconducting magnet device is configured as described above, first, the winding frames are combined so as to be concentric, positioning is performed, and then,
Welding is performed to integrate the superconducting first coil group and the superconducting second coil group into the bobbin. At this time, the heat of welding causes distortion in the flange portion 2b of the first winding frame, the flange portion 4b of the second winding frame, and the winding frame body portions 2a, 4a as shown in FIG. In FIG. 6, only the distortion at the bobbin joint on one side with respect to the center plane is shown, but the same occurs at the other joint surface. The superconducting coil 1a constituting the superconducting first coil group and the superconducting coil 3a constituting the superconducting second coil group are displaced in the radial direction due to the distortion of the bobbin body portions 2a, 4a. As a result, (1) and The magnetic field components of the 0th and higher orders shown by the equation (2) generate a non-uniform magnetic field different from the design value, and the uniformity in the magnetic field generation target area is lost. For example, in a superconducting magnet design having a magnetic field output of 15000 Gauss in the target area, the coil winding radius of the superconducting first coil group and the superconducting second coil group is set to a1 = 580, respectively.
mm, generally 50 cm when a2 = 820 mm
The required uniformity in the virtual sphere (DSV) is 10 ppm
While the reel body portions 3a, 4
When welding distortion occurs in a and a distortion amount of 1 mm occurs in the coil winding radius, a large non-uniform magnetic field component is generated as shown in the table of FIG. For this reason, there has been a problem that it is difficult to achieve the required uniformity. In addition, in the combination of the first winding frame and the second winding frame, the diameter D1 of the welded portion 5 of the flanges 2b and 4b is substantially equal to the diameter D2 of the welded portion of the flanges 2c and 4c, and positioning in the axial direction is difficult. There has been a problem that the concentricity between the first coil group and the second coil group is displaced, and a non-uniform magnetic field is generated, which adversely affects the uniformity. Further, a coil 1 in which superconducting wires are wound so as to form a rectangular section.
In FIGS. 6A and 6A, as shown in FIG. 6, the coil cross-section is no longer rectangular due to welding distortion, and the superconducting wires are misaligned. This causes the superconducting wire to move slightly (microslip) due to the electromagnetic force acting on the coil during excitation, and the frictional heat generated by this microslip causes the temperature of a portion of the superconducting wire to rise and the superconducting state to be broken, resulting in the entire superconducting magnet There is a problem that it may become one of the causes of quench.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. When the respective winding frames of the superconducting first coil group and the superconducting second coil group are integrated, the coil position shifts and the windings are reduced. An object of the present invention is to provide a superconducting magnet device having a structure in which a frame body is not affected by welding distortion, thereby preventing generation of a non-uniform magnetic field component and having high uniformity and in which quench is unlikely to occur.

[0006]

Means for Solving the Problems Claim 1 according to the present invention.
The first superconducting magnet device has a first winding frame in which flange portions are formed at both ends of a first cylindrical body portion, and a first superconducting coil group including a cylindrical superconducting coil is wound around the first body portion; A cylindrical superconducting member is formed at both ends of a cylindrical second body part having a diameter larger than that of the frame and fitted to the flange part of the first winding frame, and is disposed concentrically with the superconducting first coil group on the second body part. A second winding frame wound with a superconducting second coil group consisting of coils, the first winding frame is inserted inside the second winding frame, and the combined fitting portion is welded to integrate the two winding frames to form helium. In the superconducting magnet device configured to constitute a part of the tank, the flange portion has a different size of the diameter of the fitting portion at both end sides, and at least one of the flange portions of both winding frames and the corresponding body portion. Flange that has a reinforcing part and a part of the reinforcing part corresponds And forms a positioning portion abutting the inner surface.

According to a second aspect of the present invention, there is provided a superconducting magnet device in which flange portions are formed at both ends of a cylindrical first body portion, and a first superconducting coil group including a cylindrical superconducting coil is wound around the first body portion. A first winding frame, and a flange portion fitted to a flange portion of the first winding frame formed at both ends of a cylindrical second body portion having a diameter larger than that of the first winding frame, and a superconducting first coil group formed on the second body portion; And a second winding frame wound with a superconducting second coil group composed of concentrically arranged cylindrical superconducting coils, wherein the first winding frame is inserted inside the second winding frame and the combined fitting portion is welded. In the superconducting magnet device in which both winding frames are integrated to form a part of the helium tank, the fitting portions of the flange portion are different in fitting diameter at both end sides, and each fitting portion is The convex side meshing part projecting in a ring shape from the inner side and the convex side on the back side A positioning portion which is formed by a mating portion and a concave mating portion having a ring-shaped groove to be fitted and protruding from the inner side surface, and a part of which abuts in the axial direction when the two mating portions are fitted. Things.

Further, the superconducting magnet device according to a third aspect of the present invention is a superconducting magnet device comprising: a first bobbin having flange portions formed at both ends of a cylindrical body portion and projecting a ring-shaped support seat from inner surfaces of the flange portions facing each other; A superconducting first coil group consisting of a cylindrical superconducting coil wound around the first bobbin body, and a body divided into at least two or more saddles inserted along the support seat between the flanges. A second winding frame which is attached and has a cylindrical shape;
A superconducting first coil group comprising a cylindrical superconducting coil wound concentrically with the superconducting first coil group on the second bobbin body, wherein both winding frames form part of a helium tank It is.

[0009]

In the superconducting magnet device according to the first aspect of the present invention, when both the bobbin frames are integrated into one body, different fitting diameters at the flange portions at both ends facilitate assembly, and the reinforcement of the flange portions is achieved by the bobbin body portion. Reduce the effect of welding distortion and increase the positioning accuracy of the superconducting coil group.

According to the second aspect of the present invention, when the two winding frames are integrated into one body, the engaging portions formed on the fitting portion of the flange portion and having different diameters on both sides facilitate the assembly of the both winding frames. It strengthens the flange part, reduces the effect of welding distortion on the bobbin body, and enhances the positioning accuracy of the superconducting coil group.

Further, in the present invention, the divided winding frame inserted between the flange portions of the winding frame is fixed to the winding frame by the wound superconducting second coil group, and the both winding frames are integrated without welding. .

[0012]

[Embodiment 1] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part showing an integrated structure of a bobbin of a superconducting magnet device according to Embodiment 1 of the present invention. In the figure, 1, 3, 6, X and Y are the same as in the prior art, and their description is omitted. 7, a superconducting first coil group 1 is wound around a cylindrical first body portion 7a, and flange portions 7b having different outer diameters are provided at both ends.
In the first winding frame in which 7c is formed, 7d indicates an axial support portion of the superconducting first coil group. 8, a superconducting second coil group 3 is wound around a second body portion 8a having a diameter larger than that of the first body portion 7a, and flange portions 8b and 8c are formed at both ends, the inner diameters of which are respectively fitted to the outer diameters of the flange portions 7b and 7c. The reference numeral 8d in the second winding frame indicates an axial supporting portion of the superconducting second coil group 3. Reference numeral 9 denotes a reinforcing portion on one side provided on the second bobbin, a plurality of which are welded at an arbitrary pitch on the body portion 8a and the flange portion 7b, and positioned so as to abut on the inner surface of the flange portion 7b of the first bobbin. It has a portion 9a. 10 is a reinforcement part of the other side provided on the second winding frame, a plurality of any pitch in the second body portion 8a and the flange portion 7c is welded, assembled
The taper that comes in contact with the first winding frame flange 7c when mating
It has a positioning part 10a in the shape of a circle. 11a is welded portions of the spool of the fitting diameters D _3, 11b is welded portions of both the bobbin of fitting diameter D _4.

Next, the operation will be described. When combining the first winding frame of the superconducting first coil group with the second winding frame of the superconducting second coil group, the first winding frame flange portion 7c side and the second winding frame flange portion 8b side When the combination is carried out, the flange diameter of the winding frame is D ₃ > D ₄ , and the second winding
To the tapered positioning portion 10a of the reinforcing portion 10 on the side of the frame 8c
Thus, the radial position of the first winding frame flange 7c is determined by itself.
And the insertion work can be easily performed. When positioning the coil, a part of the reinforcing portion 9 on the second winding frame 8b side is used as the positioning portion 9a, so that the combination can be performed more accurately than in the past. Next, when performing the integrated welding, the reinforcing portions 9,
10, the mechanical strength of the flange portions 7b, 7c, 8b, 8c and the second body portion 8a is increased, and welding distortion is reduced. Therefore, welding distortion does not reach the bobbin body portions 7a, 8a. Therefore, the coils 1a and 3a do not shift in position due to welding distortion, and have a predetermined coil shape and arrangement, thereby preventing generation of a non-uniform magnetic field component due to welding distortion. In addition, misalignment of the superconducting wires of the coils 1a and 3a can be prevented, and microslip due to the electromagnetic force acting on the coil during excitation hardly occurs. Therefore, it is possible to obtain a superconducting magnet device in which the generated magnetic field uniformity in the target region is high and quench hardly occurs. In this embodiment, the reinforcement of the flange portion of the second winding frame is shown. However, a mounting space for reinforcement is secured in the first body portion of the first winding frame to reinforce the flange portion of the first winding frame. You may do it.

Embodiment 2 FIG. Embodiment 2 of the present invention will be described with reference to the drawings. Second Embodiment FIG. 2 is a cross-sectional view of a main part showing a winding frame integrated structure of a superconducting magnet device according to a second embodiment of the present invention. In the figure, the same reference numerals as those in FIG.
And its description is omitted. 12 is a cylindrical first
A first superconducting coil group 1 is wound around a body portion 12a, and flange portions 12b and 12c having different outer diameters are formed at both ends.
In the winding frame, the outer peripheral side of the flange portion 12b is provided with a convex side engaging portion 12d protruding in a ring shape from the inner side surface, and the flange portion 1
The outer peripheral side of 2c has a ring-shaped groove on the back side and forms a concave side engaging portion 12e protruding from the inner side surface. A superconductive second coil group 3 is wound around a second body portion 13a having a larger diameter than the first body portion 12a, and flange portions 13b, 13c are provided at both ends.
Is formed on the inner peripheral side of the flange portion 13b so as to protrude from the inner surface to form a ring-shaped groove.
The convex side meshing part 13d meshing with the concave side meshing part 12e of the first winding frame 12 projects from the concave side meshing part 13d meshing with the convex side meshing part 12d of the first winding frame 12 on the inner peripheral side of the flange 13c. A part 13e is formed. Numeral 14 is a positioning portion formed by the engagement portions 12e and 13e abutting in the axial direction. Note D ₅ is the insertion side minimum diameter of the second winding frame 13 D ₆
Indicates the maximum diameter of the first winding frame 12 on the insertion side.

Next, the operation will be described. When combining the first winding frame 12 around which the superconducting first coil group 1 is wound with the second winding frame 13 around which the superconducting second coil group 3 is wound,
First winding frame flange portion 12c side and second winding frame flange portion 13
When the combination is performed from the b side, the diameter of the flange of the bobbin becomes D ₅ >
A D _6, can be performed easily inserted work. In addition, by using the positioning portion 14 as the engagement portion, positioning can be performed more accurately than in the past. Next, when performing integrated welding, the first winding frame flange portions 12b and 12c and the second winding frame flange portions 13b and 13c are engaged with the engagement portions 12d and 13d.
With 12e and 13e, welding in a combined state is performed instead of mere welding in a butt state, so that welding distortion is reduced. Therefore, welding distortion does not reach the bobbin body portions 12a, 13a. Therefore, the coils 1a and 3a do not shift in position due to welding distortion, and have a predetermined coil shape and arrangement, thereby preventing generation of a non-uniform magnetic field component due to welding distortion. Also, the coils 1a, 3a
Of the superconducting wires can also be prevented, and microslip due to the electromagnetic force acting on the coil during excitation hardly occurs. Therefore, it is possible to obtain a superconducting magnet device in which the generated magnetic field uniformity in the target region is high and quench hardly occurs.

Embodiment 3 FIG. Third Embodiment A third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view of a main part showing a winding frame integrated structure of a superconducting magnet device according to a third embodiment of the present invention;
FIG. 4 is a side view showing the state before the winding frame in FIG. 3 is assembled.
In the figure, components denoted by the same reference numerals as those in FIG. 15 is a cylindrical body part 15
a superconducting first coil group 1 is wound around a
The flange portion 15 is formed by the first bobbin on which the 5b and 15c are formed.
The inner surfaces of b and 15c have support seats 15d and 15e, respectively, which project in a ring shape. A second winding frame 16 is formed by combining the divided body portions 16a and 16b divided in a saddle shape (in this case, two portions) into a cylindrical shape having a larger diameter than the body portion 15a and winding the superconducting second coil group around the outer periphery. The support seats 15d and 15e are provided between the flange portions 15b and 15c of the first reel.
It is inserted in the position.

Next, the operation will be described. Flange portion 15 of first winding frame 15 around which superconducting first coil group 1 is wound
Saddle-shaped divided body portions 16a, 16b are attached to support seats 15d, 15e provided on b, 15c (the fixing method is not shown). Thereafter, the second superconducting coil group 3 is wound around the divided body portions 16a, 16b, so that the first and second superconducting coils having a predetermined coil shape and arrangement are provided.
A second coil group is obtained. Since there is no welding work when combining the superconducting first coil group and the second coil group, a bobbin body without welding distortion is obtained. Therefore, superconducting coils 1a, 3a
Does not cause a coil position shift due to welding distortion, has a predetermined coil shape and arrangement, and can prevent generation of a non-uniform magnetic field component. Further, it is possible to obtain a superconducting magnet device in which the generated magnetic field uniformity in the target regions of the superconducting coils 1a and 3a is high and quench hardly occurs.

Embodiment 4 FIG. In the first to third embodiments, the superconducting coil group in which a plurality of superconducting coils are arranged is shown. However, a single superconducting coil can be applied. Also, the present invention can be applied to a case where the number of winding frames is two or more. Furthermore, although the medical magnetic resonance diagnostic apparatus has been described, the present invention can be applied to a high magnetic field analysis magnet.

[0019]

As described above, according to the first aspect of the present invention, the first superconducting coil is formed by forming flanges at both ends of the first cylindrical body and the cylindrical superconducting coil on the first body. A first winding frame in which the group is wound, and a flange portion fitted to the flange portion of the first winding frame are formed at both ends of a cylindrical second body portion having a diameter larger than that of the first winding frame. A second winding frame formed by winding a superconducting second coil group consisting of a cylindrical superconducting coil arranged concentrically with the first superconducting coil group, wherein the first winding frame is inserted inside the second winding frame and combined In a superconducting magnet device in which a fitting portion is welded to form a part of a helium tank by integrating both winding frames, a flange portion has a fitting portion having a different diameter at both ends, and a double winding. At least one of the flange portions of the frame has a reinforcing portion with the corresponding body portion and is supplemented. Because some parts are so as to form a positioning portion abutting the inner surface of the corresponding flange portion,
When the bobbin is integrally welded, welding distortion of the bobbin body can be prevented, and the superconducting magnet device having high uniformity of generated magnetic field and hardly causing quench can be obtained.

According to the second aspect of the present invention, the first superconducting coil group composed of the cylindrical superconducting coil is wound around the first body portion with flange portions formed at both ends of the first body portion. A first winding frame, and a flange portion fitted to a flange portion of the first winding frame formed at both ends of a cylindrical second body portion having a diameter larger than that of the first winding frame, and a superconducting first coil group formed on the second body portion. And a second winding frame formed by winding a superconducting second coil group formed of a cylindrical superconducting coil arranged concentrically, and inserting the first winding frame inside the second winding frame and welding the combination fitting portion. In the superconducting magnet device in which both winding frames are integrated to form a part of the helium tank, the fitting portion of the flange portion has a different fitting diameter at both end sides, and each fitting portion has a different fitting diameter. The convex side meshing part that protrudes in a ring shape from the inner surface and the convex side meshing part on the back side The engaging portion is formed by a concave engaging portion having a ring-shaped groove to be fitted and protruding from the inner side surface, and the engaging portion of both engaging portions forms a positioning portion partially abutting in the axial direction. Therefore, welding distortion of the body of the bobbin can be prevented when the bobbin is integrally welded, and there is an effect that a superconducting magnet device having high uniformity of generated magnetic field and hardly causing quench can be obtained.

According to the third aspect of the present invention, the first bobbin frame is formed by forming flange portions at both ends of a cylindrical body portion and projecting a ring-shaped support seat from inner surfaces of the flange portions facing each other. A superconducting first coil group including a cylindrical superconducting coil wound around the first bobbin body, and a body divided into at least two or more saddles along the support seat between the flanges. A superconducting first coil group including a cylindrical superconducting coil that is inserted and attached to form a cylindrical shape, and a cylindrical superconducting coil wound concentrically and wound around the superconducting first coil group on the second winding frame body; Since both winding frames form a part of the helium bath, the winding frames are integrated without welding, and there is an effect of obtaining a superconducting magnet device having high uniformity of generated magnetic field and hardly causing quench.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a winding frame configuration of a superconducting magnet device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a winding frame configuration of a superconducting magnet device according to a second embodiment of the present invention.

FIG. 3 is a fragmentary cross-sectional view showing a winding frame configuration of a superconducting magnet device according to Embodiment 3 of the present invention.

FIG. 4 is a side view showing a state before assembling the bobbin in FIG. 3;

FIG. 5 is a cross-sectional view of a main portion showing a winding frame configuration of a conventional superconducting magnet device.

FIG. 6 is a table showing a state of occurrence of thermal strain at the time of a conventional bobbin integral joining welding.

FIG. 7 is an explanatory diagram showing a uniformity error due to a coil position shift.

[Explanation of symbols]

1 superconducting first coil group, 1a-1c superconducting coil,
3 superconducting second coil group, 3a, 3b superconducting coils,
7 first winding frame, 7a first body portion, 7b, 7c flange portion, 8 second winding frame, 8a second body portion, 8b, 8c flange portion, 9, 10 reinforcing portion, 9
a, 10a positioning part, 11a, 11b welding part, 1
2 1st winding frame, 12a 1st body part, 12b, 12c
Flange part, 13 second winding frame, 13a Second body part, 13b, 13c
Flange part, 12d, 13e Convex side engaging part, 12e, 13d
Concave side engaging portion, 14 positioning portion, 15 first winding frame, 15a body portion,
15b, 15c flange portion, 16 second winding frame, 16
a, 16b Split body part.

Claims (3)

(57) [Claims] A first winding frame formed by forming flange portions at both ends of a cylindrical first body portion and winding a superconducting first coil group including a cylindrical superconducting coil around the first body portion; At both ends of a cylindrical second body portion having a diameter larger than that of the winding frame, flange portions to be fitted to the flange portions of the first winding frame are formed, and the second body portion is disposed concentrically with the superconducting first coil group. A second winding frame around which a superconducting second coil group formed of a cylindrical superconducting coil is wound, wherein the first winding frame is inserted inside the second winding frame and combined to weld the fitting portion. In a superconducting magnet device in which both winding frames are integrated to form a part of a helium tank, the flange portion has a different size of the diameter of the fitting portion at the both end sides, and at least both of the winding frames. If any of the flanges has a reinforcing part on the corresponding body part A superconducting magnet device, characterized in that a positioning portion is formed in which a part of the reinforcing portion is in contact with an inner surface of a corresponding flange portion. 2. A first winding frame in which flange portions are formed at both ends of a cylindrical first body portion, and a first superconducting coil group including a cylindrical superconducting coil is wound around the first body portion. At both ends of a cylindrical second body portion having a diameter larger than that of the winding frame, flange portions to be fitted to the flange portions of the first winding frame are formed, and the second body portion is disposed concentrically with the superconducting first coil group. A second winding frame around which a superconducting second coil group formed of a cylindrical superconducting coil is wound, wherein the first winding frame is inserted inside the second winding frame and combined to weld the fitting portion. In the superconducting magnet device in which both winding frames are integrated to constitute a part of the helium tank, the fitting portions of the flange portions have different fitting diameters at both end sides, and each fitting portion has a different fitting diameter. The convex side meshing part that protrudes in a ring shape from the inner surface and the convex side on the back side Forming a positioning portion which has a ring-shaped groove to be fitted with the engaging portion and has a concave side engaging portion which protrudes from the inner side surface, and a part of which abuts in the axial direction by the fitting of the both engaging portions. A superconducting magnet device. 3. A first winding frame having flange portions formed at both ends of a cylindrical body portion, and a ring-shaped support seat protruding from inner surfaces of the flange portions facing each other, and the first winding frame body portion. Superconducting No. 1 consisting of a cylindrical superconducting coil wound around
A coil group, a cylindrical second winding frame having at least two saddle-shaped body portions inserted between the flange portions along the support seat, and the second winding frame body portion And a superconducting first coil group comprising a cylindrical superconducting coil wound concentrically with the first superconducting coil group, wherein both winding frames form part of a helium tank. Superconducting magnet device.