Axial reinforcement device for high-field pulse magnet

Abstract

The present invention discloses an axial reinforcement device for a high-field pulse magnet, which belongs to the field of pulsed high magnetic field technology; the reinforcement device includes an end assembly and an internal fixing assembly; wherein the end assembly includes two parallel end plates, which are parallel to the radial plane of the pulse magnet coil and are respectively arranged at both ends of the pulse magnet coil; the internal fixing assembly is perpendicular to the end plate of the end assembly, and its main body is arranged between the two end plates of the end assembly, and is located at an interface position inside the magnet coil where free separation between coil layers will occur. After the magnet coil is wound or assembled to a predetermined step, the internal fixing assembly is arranged to clamp the two end plates of the end assembly to provide additional axial pre-tightening force for the end plates; the present invention can effectively reduce the axial gap between the coil turns caused by the circumferential pre-tightening force on the coil during the winding or assembly process of the magnet coil, thereby reducing the axial gap between the magnet end coil and the end plate when the magnet is discharged, thereby improving the service life of the magnet.

Description

Technical Field

[0001] The present invention belongs to the technical field of pulsed high magnetic field, and more specifically, relates to an axial reinforcement device for a high-field pulsed magnet. Background Art

[0002] High-magnetic field technology provides an extreme experimental environment for scientific research, and many significant scientific discoveries have been made in this environment. The stronger the magnetic field, the greater the chance of new discoveries. Compared to steady-state magnets, pulsed magnets can achieve higher magnetic field intensities.

[0003] The primary factor affecting the operational life of high-field (≥50T) pulsed magnets is the immense electromagnetic stress they experience during discharge. During discharge, the magnet coils experience both radially expanding electromagnetic stress and axially compressing electromagnetic stress, manifesting as radial expansion and axial compression.

[0004] When the magnetic field is 50T, the electromagnetic stress on the magnet is 1GPa; when the magnetic field reaches 100T, the electromagnetic stress on the magnet is as high as 4GPa, which is beyond the ability of even the strongest practical conductor material currently available to withstand.

[0005] In the 1990s, after analyzing the forces acting on pulsed magnets, the University of Leuven in Belgium discovered that the forces acting on the coil conductor layers in the radial direction of the magnet coil were not continuous. Within the coil, freely separable interfaces appeared between the layers, and the radial electromagnetic forces acting on the magnet could not be transmitted across these freely separable interfaces. Therefore, they proposed a pulsed magnet structure that reinforced the pulsed magnet coil conductors in layers. The adoption of this layered reinforcement technology increased the peak pulsed magnetic field from 68T to approximately 80T. Currently, all ultra-high field (≥80T) pulsed magnets in the world use this layered reinforcement technology.

[0006] The layered reinforcement technology of the magnet can effectively withstand the electromagnetic stress of radial expansion, but it cannot share the electromagnetic stress of axial compression. The electromagnetic stress of axial compression causes axial extrusion deformation and displacement of the magnet coil. The accumulation of axial extrusion deformation and displacement of each coil turn causes the displacement of the magnet end coil to be the largest, which in turn causes the magnet end coil to separate from the magnet end plate. In the gap area where the magnet end coil and the end plate separate, the coil often fails, which is called end coil failure. End coil failure is a common form of failure in the operation of high-field pulsed magnets and seriously affects the service life of high-field pulsed magnets.

[0007] The existing axial reinforcement method for high-field pulse magnets is usually to pass screws through the holes on the edge of the magnet end plate after the magnet coil is wound or assembled. The screws are evenly arranged around the periphery of the magnet coil, and nuts are tightened at both ends of the screws to clamp the magnet end plate, providing axial preload for the end plate and pressing the magnet coil.

[0008] This method is a post-reinforcement method, that is, the reinforcement is performed after the magnet coil is wound or assembled. It fails to provide the magnet end plate with additional axial preload in addition to the original axial preload during the magnet coil winding or assembly process. It cannot effectively reduce the axial growth of the coil caused by the circumferential preload on the coil during the magnet coil winding or assembly process, and cannot effectively control the axial gap between turns formed during the coil winding or assembly process.

[0009] The Dresden High Magnetic Field Laboratory in Germany uses a technique called axially wound steel cables to reinforce its 94.2T ultra-high-field pulse magnets. This technique reduces the axial gap between the end coils and the end plates during magnet discharge. This technique involves axially tightening the magnets with multiple parallel steel cables after the magnet coils have been reinforced using conventional reinforcement methods. This process is complex, tedious, and time-consuming. Furthermore, this technique, also a post-reinforcement method, suffers from the same issues as conventional reinforcement methods. It also fails to effectively reduce the axial growth of the magnet coils caused by the circumferential preload applied to the coils during winding or assembly, and cannot effectively control the axial gap between turns formed during the winding or assembly process.

[0010] To sum up, the existing methods cannot provide the magnet end plate with additional axial preload in addition to the original axial preload during the winding or assembly process of the magnet coil to further compress the magnet coil. They cannot effectively reduce the axial growth of the coil caused by the circumferential preload on the coil during the winding or assembly process of the magnet coil. They cannot effectively control the axial gap between the turns formed during the winding or assembly process of the coil, and thus cannot effectively reduce the axial separation gap formed between the end coil and the end plate due to the accumulated axial deformation displacement of the magnet coil caused by the electromagnetic stress of axial compression during magnet discharge. They cannot solve the problem of damage to the magnet end coil well. Summary of the Invention

[0011] In view of the defects of the prior art, the purpose of the present invention is to provide an axial reinforcement device for a high-field pulse magnet, aiming to solve the problems that the prior art cannot provide the magnet end plate with additional axial preload in addition to the original axial preload to further compress the magnet coil during the winding or assembly process of the magnet coil, cannot effectively reduce the axial growth of the coil caused by the circumferential preload on the coil during the winding or assembly process of the magnet coil, cannot effectively control the axial gap between the turns formed during the winding or assembly process of the coil, and thus cannot effectively reduce the axial separation gap formed between the end coil and the end plate due to the accumulated axial deformation displacement of the magnet coil caused by the electromagnetic stress of axial compression during the magnet discharge, and cannot solve the problem of damage to the magnet end coil.

[0012] The present invention provides an axial reinforcement device for a high-field pulse magnet, comprising an end assembly and an internal fixing assembly; the end assembly comprises two parallel end plates, which are parallel to the radial plane of the pulse magnet coil and are respectively arranged at the two ends of the pulse magnet coil; the internal fixing assembly is perpendicular to the end plate of the end assembly, and its main body is arranged between the two end plates of the end assembly, and is located at an interface position inside the pulse magnet coil where free separation between coil layers will occur; when the pulse magnet coil is wound or assembled to a predetermined step, the two end plates of the end assembly are clamped by arranging the internal fixing assembly, providing the end plates with additional axial preload in addition to the original axial preload.

[0013] The reinforcement device provided by the present invention can provide the magnet end plate with an additional axial preload in addition to the original axial preload during the winding or assembly process of the magnet coil. Because the additional axial preload near the connection between the magnet end plate and the internal fixing assembly is relatively high, and the connection is located within the radial radius of the magnet coil and is relatively close to the magnet coil as a whole, the additional axial preload that can be applied to the magnet coil is relatively high. Therefore, the axial growth of the coil caused by the circumferential preload on the coil during the winding or assembly process of the magnet coil can be effectively reduced, thereby effectively reducing the axial gap between the coil turns formed during the winding or assembly of the magnet coil, making the axial gap between the turns of the wound or assembled magnet coil smaller. Furthermore, the end axial gap caused by the axial separation between the end coil and the end plate caused by the accumulation of the axial deformation displacement of the magnet coil caused by the electromagnetic stress of the axial compression during the discharge of the magnet can be reduced.

[0014] In embodiments of the present invention, force analysis of the pulsed magnet revealed that the forces acting on the coil conductor layers in the radial direction of the magnet coil are not continuous. Within the coil, freely separated interfaces appear between the layers. At these interfaces, the layers are not squeezed by the radial electromagnetic stress of the magnet coil.

[0015] The main body of the internal fixing component is arranged at the interface position where free separation occurs between the inner layers of the coil, which can prevent the internal fixing component from being squeezed and damaged by the radial electromagnetic stress of the magnet coil during the magnet discharge process.

[0016] Furthermore, the number of internal fixing assemblies is one or more, and the internal fixing assemblies are arranged at interfaces between layers where free separation of the coil layers may occur. When there are multiple internal fixing assemblies, the multiple internal fixing assemblies can be arranged simultaneously at interfaces between the same layer where free separation of the coil layers may occur, or can be arranged separately at interfaces between multiple different layers where free separation of the coil layers may occur.

[0017] Furthermore, the internal fixing component is made of a material with a thermal conductivity greater than or equal to 50W / mK, so that it can accelerate the heat dissipation of the magnet.

[0018] Furthermore, the arrangement of the internal fixing assembly can be combined with the arrangement of the magnet cooling channel, that is, the internal fixing assembly can be arranged in the cooling channel to further promote heat exchange between the magnet and the external environment.

[0019] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0020] The axial reinforcement device of the high-field pulse magnet provided by the present invention can provide the magnet end plate with an additional axial preload in addition to the original axial preload during the winding or assembly process of the magnet coil through the combination of the end component and the internal fixing component located at the free separation interface between the coil layers. The higher additional axial preload can be applied to the magnet end plate and the magnet coil, providing an effective axial preload constraint for the magnet end plate and the magnet coil, and can effectively reduce the axial growth of the coil caused by the circumferential preload on the magnet coil during the winding or assembly process of the magnet, thereby effectively reducing the axial gap between the coil turns formed when the magnet coil is wound or assembled, making the axial gap between the turns of the wound or assembled magnet coil smaller, and further reducing the end axial gap caused by the axial separation between the end coil and the end plate caused by the accumulation of axial deformation displacement of the magnet coil caused by the electromagnetic stress of axial compression during magnet discharge, thereby increasing the service life of the high-field pulse magnet.

[0021] The technical solution provided by the present invention requires fewer accessories, has simple manufacturing and assembly processes, and can achieve the effect of increasing the service life of the magnet with a relatively simple process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 1 is a cross-sectional schematic diagram of an axial reinforcement device for a high-field pulse magnet provided by an embodiment of the present invention;

[0023] Figure 2 1 is an overall schematic diagram of an axial reinforcement device for a high-field pulse magnet provided by an embodiment of the present invention;

[0024] Figure 3 This is a typical current waveform diagram of high-field pulsed magnet discharge;

[0025] Figure 4 Schematic diagrams comparing the cross-sections of a conventional high-field pulse magnet for generating a 60T peak magnetic field and a high-field pulse magnet for generating a 60T peak magnetic field provided in an embodiment of the present invention at the time of non-discharge and discharge current peak, wherein (a) is a schematic cross-sectional diagram of the conventional magnet when not discharged; (b) is a schematic cross-sectional diagram of the magnet in the embodiment when not discharged; (c) is a schematic cross-sectional diagram of the conventional magnet at the time of discharge current peak; and (d) is a schematic cross-sectional diagram of the magnet in the embodiment at the time of discharge current peak.

[0026] In all drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1 is an end assembly, 2 is an internal fixation assembly, 3 is a cooling channel, and 4 is a pulse magnet coil. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The present invention provides an axial reinforcement device for a high-field pulse magnet. The device provides an additional axial preload force to the magnet end plate in addition to the original axial preload force during the winding or assembly process of the magnet coil, thereby reducing the axial growth of the coil caused by the circumferential preload force on the coil during the winding or assembly process of the magnet coil, thereby reducing the axial gap between the coil turns formed when the magnet coil is wound or assembled, making the axial gap between the turns of the wound or assembled magnet coil smaller, thereby reducing the end axial gap caused by the axial separation between the end coil and the end plate caused by the accumulation of axial deformation displacement of the magnet coil caused by electromagnetic stress of axial compression during magnet discharge, thereby increasing the service life of the high-field pulse magnet.

[0029] The axial reinforcement device of the high-field pulse magnet provided by the present invention comprises: an end assembly and an internal fixing assembly; wherein the end assembly comprises two parallel end plates, which are parallel to the radial plane of the pulse magnet coil and are respectively arranged at the two ends of the pulse magnet coil; the internal fixing assembly is perpendicular to the end plate of the end assembly, and its main body is arranged between the two end plates of the end assembly, and is located at the interface position where free separation between coil layers will occur inside the magnet coil; when the magnet coil is wound or assembled to a predetermined step, the internal fixing assembly is arranged to clamp the two end plates of the magnet end assembly to provide the end plates with an additional axial pre-tightening force in addition to the original axial pre-tightening force; in this way, in the process of winding or assembling the magnet coil, the magnet end plates can be provided with an additional axial pre-tightening force in addition to the original axial pre-tightening force. Additional axial preload; because the additional axial preload near the connection between the magnet end plate and the internal fixing component is higher, and the connection is located within the radial radius of the magnet coil and is relatively close to the magnet coil as a whole, the additional axial preload that can be applied to the magnet coil is higher; therefore, the axial growth of the coil caused by the circumferential preload on the coil during the winding or assembly of the magnet coil can be effectively reduced, thereby effectively reducing the axial gap between the coil turns formed when the magnet coil is wound or assembled, making the axial gap between the turns of the wound or assembled magnet coil smaller; further, the end axial gap caused by the axial separation between the end coil and the end plate caused by the accumulation of axial deformation displacement of the magnet coil caused by the electromagnetic stress of axial compression during magnet discharge can be reduced.

[0030] In an embodiment of the present invention, the main body of the internal fixing component is arranged at an interface position where free separation occurs between the inner layers of the coil. This is because the interface position where free separation occurs between the layers will not be squeezed by the radial electromagnetic stress of the magnet coil, which can prevent the internal fixing component from being squeezed by the radial electromagnetic stress of the magnet coil during the magnet discharge process and being damaged.

[0031] As one embodiment of the present invention, the end plate of the end assembly can be an epoxy glass cloth laminate or other type of plate with a certain strength. The plate can be a flat plate or a plate with a stepped or arc-shaped shape. It can be a single plate or a combination of multiple plates. The end plate of the end assembly is provided with holes for inserting or passing through the internal fixing assembly. The connection between the end plate of the end assembly and the internal fixing assembly is fastened by means of nuts, welding, adhesive bonding, etc.

[0032] In an embodiment of the present invention, the number of internal fixing components is one or more. The internal fixing component is a high-strength stainless steel screw or other types of rods with a certain strength, or other types of plates or pipes with a certain strength and a shape suitable for arrangement at the interface position where free separation between coil layers occurs, or a soft connector with a certain strength such as a steel cable. The internal fixing component can be arranged only at the interface position between layers of the same layer where free separation between coil layers occurs, or can be arranged at the interface position between multiple different layers where free separation between coil layers occurs. The internal fixing component can be made of a material with a higher thermal conductivity so that it can accelerate the heat dissipation of the magnet. The arrangement of the internal fixing component can be combined with the arrangement of the magnet cooling channel to further promote heat exchange between the magnet and the external environment.

[0033] In an embodiment of the present invention, the winding or assembly method of the magnetic coil can be a continuous winding method, a layered winding and then assembly method, a conductor cut and formed into a spiral structure and then assembled, or a plurality of conductors spliced and assembled method or 3D printing method.

[0034] In order to further illustrate the axial reinforcement device of a high-field pulse magnet provided by the present invention, its application scenario is taken as an example of a high-field pulse magnet in which the internal fixation components are arranged only at the interface between layers where the coil layers can be freely separated. The cross-sectional structure diagram is shown in FIG. Figure 1 As shown, it includes: an end component 1, an internal fixing component 2, a cooling channel 3, and a magnet coil 4.

[0035] The end assembly 1 includes two parallel end plates, which are parallel to the radial plane of the magnet coil 4 and are respectively arranged at both ends of the magnet coil 4;

[0036] The internal fixing component 2 is perpendicular to the end plate of the end component 1, and its main body is arranged between the two end plates of the end component 1, and is located at the interface position inside the magnetic coil 4 where the coil layers can be freely separated;

[0037] The cooling channel 3 is designed based on the characteristic that radial interlayer separation will occur inside the magnetic coil 4 when the high-field pulse magnet is discharged. It is also arranged at the interface position where free separation will occur between the inner layers of the magnetic coil 4.

[0038] In this embodiment, the main body of the internal fixing component 2 and the cooling channel 3 are arranged on the same layer at the interface between the layers where the coil layers can be freely separated. Therefore, it can be said that the main body of the internal fixing component 2 is located within the cooling channel 3.

[0039] The main body of the internal fixing component 2 and the cooling channel 3 are arranged at the interface position where free separation occurs between the inner layers of the coil. This is because the interface position where free separation occurs between the layers is not squeezed by the radial electromagnetic stress of the magnet coil. This can prevent the internal fixing component 2 and the cooling channel 3 from being squeezed by the radial electromagnetic stress of the magnet coil during the magnet discharge process and being damaged.

[0040] In this embodiment, holes are designed at both ends of the cooling channel 3, and the holes are arranged on the end faces of the two parallel end plates included in the end assembly 1. The cooling channel and the holes serving as its inlet and outlet can provide a path for the gas or liquid cooling medium to flow in and out, and can promote heat exchange between the magnet coil 4 and the external environment.

[0041] Specifically, the material of the end assembly 1 should be a material with a certain strength. In this embodiment, the material of the two parallel end plates included in the end assembly 1 are both epoxy glass cloth laminates.

[0042] Specifically, the structure and size of the end assembly 1 can be selected as needed. In this embodiment, the main structure of the two parallel end plates included in the end assembly 1 are both circular plates with an outer diameter of 460 mm and a thickness of 50 mm.

[0043] Specifically, the number and position of the holes arranged on the end assembly 1 can be selected as needed. In this embodiment, the two end plates included in the end assembly 1 are each arranged with 10 holes, totaling 20 holes, which are evenly arranged circumferentially on the end faces of the end plates, of which 16 holes are used to pass through the internal fixing assembly 2, and 4 holes are used as the inlet and outlet of the cooling channel 3.

[0044] Specifically, the material of the internal fixing component 2 should be a material with a certain strength. In this embodiment, the internal fixing component 2 adopts a high-strength stainless steel screw.

[0045] Specifically, the number of screws used in the internal fixation assembly 2 can be selected as needed. In this embodiment, the number of screws is 8.

[0046] Specifically, the diameter of the screw used in the internal fixation assembly 2 can be selected as needed. In this embodiment, the diameter of the screw is 12 mm.

[0047] Specifically, the position of the internal fixing component 2 can be selected as needed, but its main body must be arranged at the interface position where free separation occurs between the inner layers of the coil. In this embodiment, the main body of the internal fixing component 2 is arranged between the 4th and 5th layers of the magnet coil 4 from the inside to the outside.

[0048] Specifically, the connection method of the connection between the end plate of the end assembly 1 and the internal fixing assembly 2 can be selected according to needs. In this embodiment, the connection is connected by a nut.

[0049] Specifically, the internal fixing component 2 can be made of a material with a higher thermal conductivity coefficient as needed. In this embodiment, the material used for the internal fixing component 2 is stainless steel.

[0050] Specifically, the arrangement of the internal fixing component 2 can be combined with the arrangement of the magnet cooling channel 3. In this embodiment, the internal fixing component 2 and the cooling channel 3 are both arranged between the 4th and 5th layers of the magnet coil 4 from the inside to the outside.

[0051] Specifically, the number and arrangement of the cooling channels 3 can be selected as needed. In this embodiment, the number of cooling channels 3 is one layer, and like the internal fixation component 2, it is arranged between the fourth and fifth layers of the magnet coil 4 from the inside to the outside.

[0052] Specifically, the number and arrangement of the holes designed in the cooling channel 3 can be selected as needed. In this embodiment, the cooling channel is designed with 4 holes, which are respectively located on the end faces of the two parallel end plates included in the end assembly 1, with 2 holes on each end plate.

[0053] Specifically, the winding or assembly method of the magnetic coil 4 can be selected according to needs. In this embodiment, the magnetic coil 4 is manufactured by a continuous winding method.

[0054] Specifically, the number of layers of the magnetic coils 4 can be selected as needed. In this embodiment, the magnetic coils 4 have 4 layers inside the cooling channel 3 and 6 layers outside the cooling channel 3 , for a total of 10 layers.

[0055] In this embodiment, after the magnet coil 4 completes the winding of the fourth layer of coils from the inside out, an internal fixing component 2 is arranged between the completed fourth layer of coils and the unwound fifth layer of coils. The internal fixing component 2 is perpendicular to the end plate of the end component 1. The main body of the internal fixing component 2 is arranged between the two end plates of the end component 1. The internal fixing component 2 clamps the two end plates of the magnet end component 1 to provide the end plates with additional axial preload in addition to the original axial preload. Then the cooling channel 3 is arranged, and then the winding of the remaining 5th to 10th layers of coils is completed.

[0056] In this way, during the winding process of the magnet coil 4, an additional axial preload force is provided to the magnet end plate in addition to the original axial preload force.

[0057] Because the additional axial preload force near the connection between the magnet end plate and the internal fixing assembly 1 is relatively high, and the connection is located within the radial radius of the magnet coil 4 and is relatively close to the magnet coil 4, the additional axial preload force that can be applied to the magnet coil is relatively high.

[0058] Therefore, the axial growth of the coil caused by the circumferential preload force on the coil during the winding process of the magnetic coil 4 can be effectively reduced, thereby effectively reducing the axial gap between the coil turns formed when the magnetic coil 4 is wound, making the axial gap between the turns of the wound magnetic coil 4 smaller.

[0059] This can reduce the end axial gap caused by the axial separation between the end coil and the end plate caused by the accumulation of axial deformation displacement of the magnet coil 4 due to the electromagnetic stress of axial compression during magnet discharge.

[0060] After a conventional high-field pulse magnet for generating a 60T peak magnetic field is wound and reinforced in the usual manner, the axial growth of its magnet coil 4 is generally about 3mm. After the high-field pulse magnet for generating a 60T peak magnetic field provided in this embodiment is wound and reinforced, the axial growth of its magnet coil 4 is only about 1mm, which is about 2mm less than the axial growth of the conventional method. It can be seen that the axial gap between the turns of the magnet coil 4 in the embodiment is smaller than that of the conventional magnet.

[0061] The schematic cross-sectional view of a conventional high-field pulse magnet for generating a 60T peak magnetic field and a high-field pulse magnet for generating a 60T peak magnetic field provided in this embodiment at the time of non-discharge and discharge current peak is shown in FIG. Figure 4 As shown, it can be seen that the axial gap between the coil turns of the magnet provided in this embodiment when not discharged is smaller than that of conventional magnets, and the end axial gap between the end coil and the end plate generated by the electromagnetic stress of the axial compression of the coil at the peak moment of the discharge current is also smaller than that of conventional magnets.

[0062] The technical solution provided by the present invention effectively constrains the axial gap of the magnet, requires fewer accessories, and has simple manufacturing and assembly processes, thereby achieving the effect of increasing the service life of the magnet with a relatively simple process.

[0063] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An axial reinforcement device for a high-field pulse magnet, characterized in that: including an end assembly and an internal fixation assembly; The end assembly includes two parallel end plates, which are parallel to the radial plane of the pulse magnet coil and are respectively arranged at both ends of the pulse magnet coil; The internal fixing assembly is perpendicular to the end plate of the end assembly, and its main body is arranged between the two end plates of the end assembly, and is located at the interface position inside the pulse magnet coil where the coil layers can be freely separated; When the pulse magnet coil is wound or assembled to a predetermined step, the two end plates of the end assembly are clamped by arranging an internal fixing assembly to provide the end plates with additional axial preload in addition to the original axial preload.

2. The axial reinforcement device according to claim 1, characterized in that The end plate is an epoxy glass cloth laminate.

3. The axial reinforcement device according to claim 1 or 2, characterized in that: The end plate is provided with holes for inserting or passing the internal fixation component.

4. The axial reinforcement device according to any one of claims 1 to 3, characterized in that: The connection between the end plate and the internal fixing assembly is fastened by nut connection, welding or adhesive bonding.

5. The axial reinforcement device according to any one of claims 1 to 4, characterized in that: The internal fixing component is a high-strength stainless steel screw.

6. The axial reinforcement device according to any one of claims 1 to 5, characterized in that: The number of the internal fixation components is one or more.

7. The axial reinforcement device according to claim 6, characterized in that The internal fixing component is arranged at an interface position between layers where free separation of the coil layers may occur.

8. The axial reinforcement device according to claim 6, characterized in that: When there are multiple internal fixing components, the multiple internal fixing components can be simultaneously arranged at the interface positions between the same layer where the coil layers can be freely separated, or can be respectively arranged at the interface positions between multiple different layers where the coil layers can be freely separated.

9. The axial reinforcement device according to claim 1, characterized in that: The internal fixation component is made of a material with a thermal conductivity greater than or equal to 50 W / mK.

10. The axial reinforcement device according to claim 1, characterized in that: The winding or assembly methods of the pulse magnet coil include: continuous winding, assembly after layered winding, assembly after cutting and shaping the conductor into a spiral structure, assembly by splicing multiple conductors, or 3D printing.

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