KR20190075539A - superconductor magnet apparatus and shimming method of the same - Google Patents

Abstract

According to the present invention, disclosed are a magnetic seaming module and a superconducting magnet device including the same. The device comprises: a superconducting coil module; and a magnetic seaming module disposed in the superconducting coil module and controlling a magnetic field in the superconducting coil module. The magnetic seaming module can comprise: an external seaming module in the superconducting coil module; and an internal seaming module disposed in the external seaming module to increase a uniformity of the magnetic field in the superconducting coil module. Therefore, an objective of the present invention is to provide the superconducting magnet device capable of improving spatial uniformity of the magnetic field.

Description

TECHNICAL FIELD [0001] The present invention relates to a superconducting magnet apparatus and a shimming method thereof,

The present invention relates to a superconducting magnet device, and more particularly, to a superconducting magnet device including a plurality of seaming modules and a seaming method thereof.

A superconductor can flow current without loss of power. For example, a high temperature superconductor (HTS) has a characteristic that the resistance becomes zero below the critical temperature above the vaporization temperature of liquid nitrogen. High-temperature superconductors are actively being researched and developed to be commercialized as power devices such as cables, transformers, generators, current limiters, and motors as well as medical / biotechnological applications such as magnetic resonance imaging (MRI) and nuclear magnetic resonance .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a superconducting magnet device capable of improving the spatial uniformity of a magnetic field.

The present invention discloses a superconducting magnet device. The apparatus includes a superconducting coil module; And a magnetic seaming module disposed in the superconducting coil module and controlling a magnetic field in the superconducting coil module. Here, the magnetic seaming module may include: an external seaming module in the superconducting coil module; And an inner seaming module disposed within the outer seaming module to increase the uniformity of the magnetic field within the superconducting coil module.

According to an embodiment of the present invention, the superconducting coil module comprises: a bobbin; And a superconducting wire wound around an outer circumferential surface of the bobbin. The superconducting wire may include a high-temperature superconductor.

According to an embodiment of the present invention, the outer seaming module comprises: a first cylinder disposed in the bobbin and extending along the bobbin; And first iron pieces disposed on an outer circumferential surface of the first cylinder.

According to an embodiment of the present invention, the outer seaming module may further include a first adhesive tape disposed on the first iron pieces, for pressing the first iron pieces to the first cylinder.

According to an embodiment of the present invention, a distance between the bobbin and the first cylinder may be greater than a thickness of the first and second adhesive tapes.

According to an embodiment of the present invention, the first cylinder may include an aluminum pipe or a sulfur pipe.

According to one embodiment of the present invention, the inner seaming module comprises: a second cylinder in the first cylinder; And second iron pieces disposed on an outer circumferential surface of the second cylinder.

According to an embodiment of the present invention, the inner seaming mode may further include a second adhesive tape disposed on the second iron pieces, for pressing the second iron pieces to the second cylinder.

According to an embodiment of the present invention, the distance between the first cylinder and the second cylinder may be larger than the thickness of the second steel pieces and the second adhesive tape.

The second cylinder may include an aluminum pipe or a sulfur pipe.

A method of seaming a superconducting magnet device according to the present invention includes the steps of: inducing a magnetic field in a superconducting coil module; Measuring the magnetic field in the bobbin of the superconducting coil module to map the intensity of the magnetic field; Determining a position of a first iron piece to be fixed to a first cylinder provided in the bobbin; Re-inducing the magnetic field in the first cylinder using the first iron piece; Re-measuring the magnetic field in the first cylinder to remap the intensity of the magnetic field; And determining the position of the second iron piece to be fixed to the second cylinder provided in the first cylinder.

According to an embodiment of the present invention, there is provided a method of manufacturing a magnetic head, comprising: inducing again the magnetic field in the second cylinder using the first and second iron pieces; And measuring the magnetic field in the second cylinder again to map the intensity of the magnetic field.

As described above, the superconducting magnet apparatus according to the embodiment of the present invention can improve the spatial uniformity of the magnetic field by using the inner seaming module in the outer seaming module in the superconducting coil module.

1 is a cross-sectional view illustrating a superconducting magnet apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an example of the magnetic seaming module of FIG. 1. FIG.
Fig. 3 is a flow chart showing a seaming method of the superconducting magnet apparatus of Fig. 1;
FIG. 4 is a graph showing a first magnetic field change rate of a superconducting coil, a second magnetic field change rate using an external seaming module, and a third magnetic field change using an external seaming module and an internal seaming module.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in different forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the concept of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms 'comprises' and / or 'comprising' mean that the stated element, step, operation and / or element does not imply the presence of one or more other elements, steps, operations and / Or additions. In addition, since they are in accordance with the preferred embodiment, the reference numerals presented in the order of description are not necessarily limited to the order. In addition, in this specification, when it is mentioned that a film is on another film or substrate, it means that it may be formed directly on another film or substrate, or a third film may be interposed therebetween.

In addition, the embodiments described herein will be described with reference to cross-sectional views and / or plan views, which are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process. For example, the etched area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have schematic attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific types of regions of the elements and are not intended to limit the scope of the invention.

FIG. 1 shows a superconducting magnet apparatus 100 according to an embodiment of the present invention.

Referring to FIG. 1, the superconducting magnet apparatus 100 of the present invention may include a nuclear magnetic resonance (NMR) apparatus. Alternatively, the superconducting magnet device 100 may include a magnetic resonance imaging (MRI) device. According to one example, the superconducting magnet device 100 may include a coolant chamber 110, a superconducting coil module 120, and a magnetic seaming module 130.

The refrigerant chamber 110 may store the refrigerant 112. For example, the refrigerant 112 may comprise liquid nitrogen and / or liquid helium. The superconducting coil modules 120 may be disposed within the refrigerant chamber 110. The superconducting coil modules 120 may be immersed in the refrigerant 112. [ The refrigerant 112 can be circulated to a chiller (not shown) outside the refrigerant chamber 110. The refrigerant 112 may have a temperature of about 77K or less. The superconducting coil modules 120 may be cooled by the refrigerant.

The superconducting coil module 120 may include a bobbin 122 and a superconducting coil 124. The bobbin 122 may be disposed within the superconducting coil 124. For example, the bobbin 122 may comprise an insulating pipe of plastic or polymer. The superconducting coil 124 may be wound along the outer circumferential surface of the bobbin 122. The superconducting coil 124 may comprise high temperature superconducting wires. The superconducting coil 124 may induce the magnetic field 140 in the bobbin 122.

The magnetic seaming module 130 may be disposed within the refrigerant chamber 110 and the superconducting coil modules 120. The magnetic seaming module 130 may be spaced apart from the refrigerant 112. The magnetic field 140 of the superconducting coil modules 120 may pass through the magnetic seaming module 130. The magnetic seaming module 130 can control the magnetic field 140 uniformly.

FIG. 2 shows an example of the magnetic seaming module 130 of FIG.

1 and 2, the magnetic seaming module 130 may include an outer seaming module 133 and an inner seaming module 137.

The outer seaming module 133 may be disposed within the bobbin 122. According to one example, the outer seaming module 133 may include a first cylinder 132, first iron pieces 134, and a first adhesive tape 153.

The first cylinder 132 may be disposed within the bobbin 122. The first cylinder 132 may extend along the bobbin 122. The first cylinder 132 may include a non-magnetic body. For example, the first cylinder 132 may include an aluminum pipe or a SUS pipe.

The first iron pieces 134 may be disposed on the outer circumferential surface of the first cylinder 132. The first iron pieces 134 may be ferromagnetic. The first iron pieces 134 may control the magnetic field 140 in the first cylinder 132. For example, the first iron pieces 134 may improve the spatial uniformity of the magnetic field 140 in the first cylinder 132. The position and shape of the first iron pieces 134 may be determined according to the distribution of the magnetic field 140 in the bobbin 122. The magnetic field 140 may be non-uniformly measured within the bobbin 122 due to errors in design and fabrication. The first iron pieces 134 may be designed to make the magnetic field 140 uniform.

The first adhesive tape 135 may press and / or fix the first iron pieces 134 on the outer circumferential surface of the first cylinder 132. The distance between the bobbin 122 and the first cylinder 132 may be greater than the thickness of the first iron pieces 134 and the first adhesive tape 135.

The inner seaming module 137 may be disposed within the outer seaming module 133. According to one example, the inner seaming module 137 may include a second cylinder 136, second iron pieces 138, and a second adhesive tape 139.

The second cylinder 136 may be disposed in the first cylinder 132. The second cylinder 136 may be parallel to the first cylinder 132. The second cylinder 136 may include a non-magnetic body. For example, the second cylinder 136 may include an aluminum pipe or a SUS pipe.

The second iron pieces 138 may be disposed on the outer circumferential surface of the second cylinder 136. The second iron pieces 138 may be ferromagnetic. The second iron pieces 138 may control the magnetic field 140 in the second cylinder 136. For example, the second iron pieces 138 may improve the spatial uniformity of the magnetic field 140. The position and shape of the second iron pieces 138 may be adjusted according to the distribution of the magnetic field 140 in the bobbin 122.

The second adhesive tape 139 may press and / or fix the second iron pieces 138 on the outer circumferential surface of the second cylinder 136. [ The distance between the second cylinder 136 and the first cylinder 132 may be greater than the thickness of the second adhesive tape 138.

Although not shown, third to nth cylinders may be disposed in the second cylinder 136. Also, third to n-th wire pieces and third to n-th adhesive tapes may be disposed on the outer circumferences of the third to n-th cylinders. The third to nth iron pieces can deflect the magnetic field 140 in the third to nth cylinders to improve spatial uniformity.

The seaming method of the superconducting magnet apparatus 100 having the above-described structure will now be described.

3 is a flow chart showing a seaming method of the superconducting magnet apparatus 100 of FIG.

Referring to FIG. 3, the shimming method of the present invention includes the steps of: (S10) inducing a magnetic field 140 in a bobbin 122; measuring the magnetic field 140 in the bobbin 122; (S40) of inducing the magnetic field (140) in the first cylinder (132), determining the position of the magnetic field (140) in the first cylinder (132) (S50), determining the position of the second iron pieces 138 (S60), inducing the magnetic field 140 again in the second cylinder 136 (S70) A step S80 for measuring again the magnetic field 140 in the second cylinder 136 and a step S90 for evaluating the spatial uniformity of the magnetic field 140.

First, the superconducting coil module 120 induces the magnetic field 140 in the bobbin 122 without the magnetic seaming module 130 (S10). The intensity of the magnetic field 140 may be proportional to the current applied to the superconducting coil 124.

Next, a field mapper (not shown) measures the magnetic field 140 in the bobbin 122 and maps the intensity of the magnetic field 140 according to the position in the bobbin 122 (S20). The field mapper may be moved in the direction of the magnetic field 140 from the center of the bobbin 122. The intensity of the magnetic field 140 may be quantitatively measured and / or mapped along the axial direction of the bobbin 122.

Then, the controller determines the position of the first iron pieces 134 (S30). The arrangement position of the first iron pieces 134 may be determined to be a position where the magnetic field 140 is nonuniform. The worker and / or engineer can wind the first adhesive tape 135 on the outer circumferential surface of the first cylinder 132 through the first iron pieces 134. [ The first cylinder 132 may be provided in the bobbin 122.

Next, the superconducting coil module 120 induces the magnetic field 140 in the first cylinder 132 again (S40).

Thereafter, the field mapper measures the magnetic field 140 in the first cylinder 132 again and maps the intensity of the magnetic field 140 again according to the position in the first cylinder 132 (S50).

The controller determines an arrangement position of the second iron pieces 138 (S60). The position of the second iron pieces 138 may be determined to be a non-uniform position of the magnetic field 140. The operator and / or engineer can wind the second adhesive tape 139 on the outer circumferential surface of the second cylinder 136 via the second iron pieces 138. The second cylinder 136 may be provided in the first cylinder 132.

Next, the superconducting coil module 120 induces the magnetic field 140 again in the second cylinder 136 (S70).

The field mapper measures the magnetic field 140 in the second cylinder 136 again and maps the intensity of the magnetic field 140 again according to the position in the second cylinder 136 (S80).

Finally, the controller evaluates the spatial uniformity of the magnetic field 140 in the second cylinder 136 (S90). The space uniformity can be improved by the first iron pieces 134 and the second iron pieces 138. [

4 is a graph showing the relationship between the first magnetic field change rate 152 of the superconducting coil 124, the second magnetic field change rate 154 using the external seaming module 133, the third magnetic field change rate 154 using the external seaming module 133 and the internal seaming module 137, The magnetic field change rate 156 is compared and shown.

4, the second magnetic field change rate 154 may be smaller than the first magnetic field change rate 152, and the third magnetic field change rate 156 may be smaller than the second magnetic field change rate 154. Referring to FIG.

The rate of change of the magnetic field 140 may correspond to spatial uniformity. For example, the superconducting coil 124 may generate a magnetic field 140 with a spatial uniformity of about 614 parts per million (ppm). The first iron pieces 134 and the second iron pieces 138 can improve the spatial uniformity of the magnetic field 140. The first iron pieces 134 may deflect the magnetic field 140 in the first cylinder 132 to a spatial uniformity of about 158 ppm. In addition, the first iron pieces 134 and the second iron pieces 138 can deflect the magnetic field in the second cylinder 136 to a spatial uniformity of about 39 ppm.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

Claims (12)

Superconducting coil module; And
And a magnetic seaming module disposed in the superconducting coil module and controlling a magnetic field in the superconducting coil module,
The magnetic seaming module comprises:
An outer seaming module in the superconducting coil module; And
And an inner seaming module disposed within the outer seaming module to increase the uniformity of the magnetic field within the superconducting coil module.
The method according to claim 1,
The superconducting coil module comprises:
Bobbin; And
And a superconducting wire wound around an outer circumferential surface of the bobbin,
Wherein the superconducting wire comprises a high-temperature superconductor.
3. The method of claim 2,
The external seaming module comprises:
A first cylinder disposed in the bobbin and extending along the bobbin; And
And first iron pieces disposed on an outer circumferential surface of the first cylinder.
3. The method of claim 2,
Wherein the outer seaming module further comprises a first adhesive tape disposed on the first iron pieces and compressing the first iron pieces to the first cylinder.
5. The method of claim 4,
Wherein a distance between the bobbin and the first cylinder is larger than a thickness of the iron pieces and the first adhesive tape.
3. The method of claim 2,
Wherein the first cylinder comprises an aluminum pipe or a stainless steel pipe.
3. The method of claim 2,
The internal seaming module comprises:
A second cylinder in the first cylinder; And
And second iron pieces disposed on an outer circumferential surface of the second cylinder.
8. The method of claim 7,
Wherein the inner seaming mode further comprises a second adhesive tape disposed on the second iron pieces to compress the second iron pieces to the second cylinder.
9. The method of claim 8,
Wherein a distance between said first cylinder and said second cylinder is larger than a thickness of said second steel pieces and said second adhesive tape.
8. The method of claim 7,
Wherein the second cylinder comprises an aluminum pipe or a stainless steel pipe.
Inducing a magnetic field in the superconducting coil module;
Measuring the magnetic field in the bobbin of the superconducting coil module to map the intensity of the magnetic field;
Determining a position of a first iron piece to be fixed to a first cylinder provided in the bobbin;
Re-inducing the magnetic field in the first cylinder using the first iron piece;
Re-measuring the magnetic field in the first cylinder to remap the intensity of the magnetic field;
And determining a position of a second iron piece to be fixed to a second cylinder provided in the first cylinder.
12. The method of claim 11,
Inducing the magnetic field in the second cylinder again using the first and second iron pieces; And
Further comprising measuring the magnetic field in the second cylinder again to map the intensity of the magnetic field.

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