Large-aperture high-field-intensity gradient superconducting magnet

Abstract

The invention discloses a large-aperture high-field-intensity gradient superconducting magnet, and relates to the technical field of superconducting application. The superconducting magnet specifically comprises a superconducting magnet winding and a magnet framework. The superconducting magnet winding comprises a first forward coil, a second forward coil, a third forward coil and a first reverse coil, wherein the first forward coil, the second forward coil and the third forward coil are coaxially nested, and the first reverse coil and the first forward coil are coaxially wound and are opposite in current direction. The first forward coil is wound at the lower end of the first coil framework, and the first reverse coil is wound at the upper end. The upper end faces of the first forward coil, the second forward coil and the third forward coil are located on the same horizontal plane. The problem that an existing large-aperture magnet is insufficient in field intensity and gradient and overlarge in internal stress is solved, high field intensity and high gradient are achieved through specific coil arrangement, and the stress failure risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of superconducting application technology, and in particular to a large-aperture, high-field-strength gradient superconducting magnet. Background Technology

[0002] High-field-gradient superconducting magnets have been widely used in various fields such as crystal levitation and materials testing. As experimental requirements increase, the room-temperature aperture size of the required superconducting magnets is gradually rising. At apertures greater than or equal to 200 mm, axisymmetric nested solenoid magnets can no longer meet the high field strength and high gradient requirements of experiments. Simultaneously, the enormous internal repulsive forces within high-gradient magnets place high demands on the magnet's support structure. Current technologies struggle to simultaneously guarantee high field strength and high gradient performance while maintaining large apertures, and they also struggle to effectively manage the enormous internal stresses.

[0003] Therefore, how to design a high field strength gradient superconducting magnet structure with a large aperture to solve the problems of insufficient field strength and gradient and stress failure risk has become an urgent technical problem to be solved. Summary of the Invention

[0004] The main objective of this invention is to provide a large-aperture, high-field-strength gradient superconducting magnet, aiming to design a high-field-strength gradient superconducting magnet structure with a large aperture to solve the problems of insufficient field strength and gradient, as well as stress failure risk.

[0005] To achieve the above objectives, this invention proposes a large-aperture, high-field-strength gradient superconducting magnet, comprising a superconducting magnet winding and a magnet frame; the superconducting magnet winding includes a first forward coil, a second forward coil, a third forward coil, and a first reverse coil, and the magnet frame includes at least a first coil frame; wherein the first forward coil, the second forward coil, and the third forward coil are coaxially nested; the first forward coil and the first reverse coil are coaxially wound on the first coil frame, and the first forward coil and the first reverse coil are configured with opposite current directions; the first forward coil is wound at the lower end of the first coil frame, and the first reverse coil is wound at the upper end of the first coil frame; the upper surfaces of the first forward coil, the second forward coil, and the third forward coil are located on the same horizontal plane.

[0006] Preferably, the first forward coil and the second forward coil are made of the following material: The materials of the third forward coil and the first reverse coil are: The first forward coil and the first reverse coil have the same inner diameter.

[0007] Preferably, the magnet frame further includes a second coil frame, a third coil frame, a bottom flange, a right flange, an upper flange, and a left flange; the second positive coil is wound on the second coil frame, and the third positive coil is wound on the third coil frame.

[0008] Preferably, the bottom of the first coil frame, the bottom of the second coil frame, and the bottom of the third coil frame are all connected by the bottom flange; the top of the first coil frame is connected to a magnet hanger assembly by the upper flange.

[0009] Preferably, the right flange and the left flange are fitted to the middle of the first coil frame, and the right flange and the left flange are located on the same plane; the top of the second coil frame and the top of the third coil frame are connected together through the right flange and the left flange; a magnet support rod is fixed between the right flange and the left flange.

[0010] Preferably, the superconducting magnet winding further includes a first prestress layer, a second prestress layer, a third prestress layer, and a fourth prestress layer; the first prestress layer is wound on the outside of the first forward coil, the second prestress layer is wound on the outside of the second forward coil, the third prestress layer is wound on the outside of the third forward coil, and the fourth prestress layer is wound on the outside of the first reverse coil; the first prestress layer, the second prestress layer, the third prestress layer, and the fourth prestress layer are made of stainless steel or aluminum alloy.

[0011] Preferably, the superconducting magnet winding further includes a first connector support, a second connector support, a third connector support, a fourth connector support, a fifth connector support, a sixth connector support, a seventh connector support, an eighth connector support, a ninth connector support, and a tenth connector support; the sixth connector support is located at the inner end of the upper part of the first forward coil where the wire enters and exits; the fifth connector support is located at the outer end of the upper part of the first forward coil where the wire enters and exits; the tenth connector support is located at the outer end of the upper part of the first reverse coil where the wire enters and exits; and the seventh connector support is located at the inner end of the lower part of the first reverse coil where the wire enters and exits.

[0012] Preferably, the fourth connector is supported at the inner upper end of the second positive coil where the wire enters and exits; the third connector is supported at the outer upper end of the second positive coil where the wire enters and exits; and the eighth connector is supported at the middle section of the upper end of the second positive coil where the wire enters and exits. The second connector is supported at the inner upper end of the third positive coil where the wire enters and exits; the first connector is supported at the outer upper end of the third positive coil where the wire enters and exits; and the ninth connector is supported at the middle section of the upper end of the third positive coil where the wire enters and exits.

[0013] Preferably, it further includes a cryogenic device and a magnet suspension device; the cryogenic device includes an outer Dewar, a cold screen, and a helium tank; the helium tank is located inside the cold screen, and the cold screen is located inside the outer Dewar; the superconducting magnet winding is suspended from the cold screen, the outer Dewar, and the helium tank by the magnet suspension device.

[0014] Preferably, a glass fiber wound insulation layer is provided between the first forward coil and the first reverse coil and the cylindrical wall of the first coil frame, between the second forward coil and the cylindrical wall of the second coil frame, and between the third forward coil and the cylindrical wall of the third coil frame; a polyimide or mica insulation layer is provided between the first forward coil and the first reverse coil and the frame flange of the first coil frame, between the second forward coil and the frame flange of the second coil frame, and between the third forward coil and the frame flange of the third coil frame.

[0015] The above technical solution has the following advantages: The large-aperture, high-field-strength gradient superconducting magnet provided by this invention achieves a high-field-strength, high-gradient centerline magnetic field distribution with a large aperture by arranging a first, second, and third forward coil coaxially nested on the magnet frame, and by coordinating with a first reverse coil whose current direction is opposite to that of the first forward coil. This structure, through a specific coil arrangement, can significantly increase the peak value of the magnetic field gradient product along the centerline. Simultaneously, this structure transforms the repulsive force between the magnet coils into internal forces within the frame, effectively reducing the risk of stress failure and thus improving the stability and safety of the magnet's operation. Attached Figure Description

[0016] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a front view of the overall structure of a large-aperture, high-field-strength gradient superconducting magnet provided in an embodiment of the present invention.

[0017] Figure 2 This is a left-side view of the overall structure of the large-aperture, high-field-strength gradient superconducting magnet provided in an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the superconducting magnet winding structure distribution provided in an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of the lead connector support distribution provided in an embodiment of the present invention.

[0020] Figure 5 This is a schematic diagram of the overall external structure of the internal magnet provided in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the magnetic field strength and magnetic field gradient distribution provided in an embodiment of the present invention.

[0022] 1. Superconducting magnet winding; 2. Cryogenic device; 3. Magnet suspension device; 101. First forward coil; 102. Second forward coil; 103. Third forward coil; 104. First reverse coil; 105. First prestressed layer; 106. Second prestressed layer; 107. Third prestressed layer; 108. Fourth prestressed layer; 109. First coil frame; 110. Second coil frame; 111. Third coil frame; 112. Bottom flange; 113. Right flange; 114. Top flange; 115. Figure-eight inlet / outlet port; 116. Left flange; 117. Connector opening; 118. Diode assembly; 119. Diode fixture; 120. First connector 121. Head support; 122. Second joint support; 123. Third joint support; 124. Fourth joint support; 125. Fifth joint support; 126. Sixth joint support; 127. Seventh joint support; 128. Eighth joint support; 129. Ninth joint support; 120. Tenth joint support; 131. Magnet support rod; 132. Low-temperature current lead; 133. High-temperature current lead; 134. Copper lead; 201. External Dewar; 202. Cold shield; 203. Helium tank; 204. Refrigeration unit; 205. Condenser; 206. Well casing; 207. Positioning block; 301. Liquid helium tank lifting rod assembly; 302. Magnet lifting rod assembly; 303. Lateral tie rod. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1 to 6 As shown, this embodiment of the invention provides a large-aperture, high-field-strength, and high-gradient superconducting magnet. The magnet mainly includes a superconducting magnet winding 1, a cryogenic device 2, and a magnet suspension device 3. The superconducting magnet winding 1 is configured to achieve high field strength and high gradient while ensuring a large aperture; its room-temperature aperture is designed to be greater than or equal to 200 mm.

[0025] In this embodiment, the superconducting magnet winding 1 includes a first forward coil 101, a second forward coil 102, a third forward coil 103, and a first reverse coil 104. The magnet frame, as a supporting structure, includes at least a first coil frame 109, a second coil frame 110, and a third coil frame 111. To increase the central magnetic field and optimize space utilization, the first forward coil 101, the second forward coil 102, and the third forward coil 103 are coaxially nested. Specifically, the first forward coil 101 is located in the innermost layer, the second forward coil 102 in the middle layer, and the third forward coil 103 in the outermost layer. To increase the peak value of the magnetic field gradient product along the center line, the upper surfaces of the first forward coil 101, the second forward coil 102, and the third forward coil 103 are configured to be on the same horizontal plane.

[0026] Regarding the winding and distribution of the coils, the first forward coil 101 and the first reverse coil 104 are coaxially wound on the first coil frame 109. The first forward coil 101 is wound at the lower end of the first coil frame 109, while the first reverse coil 104 is wound at the upper end of the first coil frame 109. In terms of electrical connection and configuration, the first forward coil 101 and the first reverse coil 104 are configured with opposite current directions, and the inner diameters of the first forward coil 101 and the first reverse coil 104 are the same. The second forward coil 102 is wound on the second coil frame 110, and the third forward coil 103 is wound on the third coil frame 111. This structural layout allows the repulsive force generated inside the magnet to be converted into the internal force of the frame, thereby reducing the risk of stress failure.

[0027] Regarding material selection, in order to meet the requirements of high field strength, the materials used for the first forward coil 101 and the second forward coil 102 are... Materials. Meanwhile, the materials selected for the third forward coil 103 and the first reverse coil 104... Materials. To ensure the stability of the coil structure and resist enormous electromagnetic forces, the superconducting magnet winding 1 also includes a first prestress layer 105, a second prestress layer 106, a third prestress layer 107, and a fourth prestress layer 108. The first prestress layer 105 is wound on the outside of the first forward coil 101, the second prestress layer 106 is wound on the outside of the second forward coil 102, the third prestress layer 107 is wound on the outside of the third forward coil 103, and the fourth prestress layer 108 is wound on the outside of the first reverse coil 104. All of the above prestress layers are wound using high-strength, high-thermal-shrinkage-coefficient materials, such as SS304 stainless steel or AL6061-T6 aluminum alloy. The outer edges of the first prestress layer 105, the second prestress layer 106, the third prestress layer 107, and the fourth prestress layer 108 are flush with the edges of their respective frame flanges.

[0028] The magnet skeleton assembly also includes a bottom flange 112, a right flange 113, an upper flange 114, and a left flange 116. The bottoms of the first coil skeleton 109, the second coil skeleton 110, and the third coil skeleton 111 are all connected via the bottom flange 112. The bottom flange 112 has a liquid helium leakage hole, and a positioning step is machined on the connecting surface of the bottom flange 112 to ensure assembly accuracy. The top of the first coil skeleton 109 is connected to the magnet hanger assembly 302 via the upper flange 114. The right flange 113 and the left flange 116 are tightly fitted to the middle of the first coil skeleton 109, and the right flange 113 and the left flange 116 are located on the same plane. The tops of the second coil skeleton 110 and the third coil skeleton 111 are connected together via the right flange 113 and the left flange 116. A magnet support rod 130 is also fixed between the right flange 113 and the left flange 116, and a G10 sleeve is provided on the outer side of the magnet support rod 130. Bottom flange 112, right flange 113, top flange 114, and left flange 116 are all connected to each frame by bolts. The first coil frame 109, the second coil frame 110, and the third coil frame 111 are also provided with two locating pin holes. The inner side of the connection surface between the first coil frame 109 and the bottom flange 112 is also machined with a locating step.

[0029] To achieve electrical connection and fixation between coils, the superconducting magnet winding 1 also includes a first connector support 120, a second connector support 121, a third connector support 122, a fourth connector support 123, a fifth connector support 124, a sixth connector support 125, a seventh connector support 126, an eighth connector support 127, a ninth connector support 128, and a tenth connector support 129. The specific layout is as follows: the sixth connector support 125 is located at the inner upper end of the first positive coil 101 where the wire enters and exits; the fifth connector support 124 is located at the outer upper end of the first positive coil 101 where the wire enters and exits; both are bolted to the first coil frame 109. The fourth connector support 123 is located at the inner upper end of the second positive coil 102 where the wire enters and exits; the third connector support 122 is located at the outer upper end of the second positive coil 102 where the wire enters and exits; both are bolted to the second coil frame 110. The second connector support 121 is located at the inner upper end of the third forward coil 103, where the wires enter and exit. The first connector support 120 is located at the outer upper end of the third forward coil 103, where the wires enter and exit. Both are bolted to the third coil frame 111. Specifically, a sliding limiting device is provided on the other side of the first connector support 120. The tenth connector support 129 is located at the outer upper end of the first reverse coil 104, where the wires enter and exit. The seventh connector support 126 is located at the inner lower end of the first reverse coil 104, where the wires enter and exit. Both are bolted to the first coil frame 109. Furthermore, the eighth connector support 127 is located at the middle upper end of the second forward coil 102, where the wires enter and exit in a segment, and is connected to the second coil frame 110; the ninth connector support 128 is located at the middle upper end of the third forward coil 103, where the wires enter and exit in a segment, and is connected to the third coil frame 111. Insulating material, such as polyimide or ALN ceramic gaskets, is provided between each connector support and the frame. Insulating sleeves are provided on the outer sides of the bolts on each connector support. The connector opening 117 is located in the middle section of the first coil frame 109.

[0030] Regarding the lead wire and protection system, one side of the low-temperature current lead 131 extends from the tenth connector support 129 and the first connector support 120, while the other side of the low-temperature current lead 131 is connected to the high-temperature current lead 132. The high-temperature current lead 132 is fixedly connected to the copper lead 133. The figure-eight shaped inlet / outlet 115 is located below the first connector support 120, the second connector support 121, the third connector support 122, the fourth connector support 123, the fifth connector support 124, and the sixth connector support 125. Furthermore, the diode group 118 is fixed to the upper end face of the upper flange 114 via a diode fixture 119 for quench protection of the magnet.

[0031] Regarding the insulation structure, a glass fiber wound insulation layer is provided between the first forward coil 101 and the first reverse coil 104 and the cylindrical wall of the first coil frame 109, between the second forward coil 102 and the cylindrical wall of the second coil frame 110, and between the third forward coil 103 and the cylindrical wall of the third coil frame 111. Simultaneously, a polyimide or mica insulation layer is provided between the first forward coil 101 and the first reverse coil 104 and the frame flange of the first coil frame 109, between the second forward coil 102 and the frame flange of the second coil frame 110, and between the third forward coil 103 and the frame flange of the third coil frame 111.

[0032] The magnet also includes a cryogenic device 2 and a magnet suspension device 3. The cryogenic device 2 includes an outer Dewar 201, a cold shield 202, and a helium tank 203. The helium tank 203 is located inside the cold shield 202, which is located inside the outer Dewar 201. The superconducting magnet winding 1 is suspended from the cold shield 202, the outer Dewar 201, and the helium tank 203 via the magnet suspension device 3. Specifically, the cold shield 202 is suspended from the middle side of the liquid helium tank suspension rod assembly 301 via a mid-section flange, and the helium tank 203 is suspended from the lower side of the liquid helium tank suspension rod assembly 301 via a bottom flange. The helium tank 203 and the outer Dewar 201, as well as the cold shield 202 and the outer Dewar 201, are connected by transverse tie rods 303 to provide lateral support stability. The primary cold head of the refrigerator 204 is connected to the cold shield 202 by screws, and a condenser 205 is installed at the secondary cold head of the refrigerator 204. A fluid delivery tube extends from the well casing 206 to the inner bottom of the helium tank 203, and a thermal shut-off is installed between the cold shield 202 and the well casing 206. A burst valve connected to a vent is installed inside the helium tank 203. A positioning block 207 is installed on the inner bottom of the helium tank 203, and the positioning block 207 is fixedly connected to the helium tank 203, with a gap maintained between the positioning block 207 and the superconducting magnet winding 1.

[0033] In this embodiment, the superconducting magnet winding 1 is powered by a single power supply. When the magnet is energized, with a target current of 176.5A, the theoretical total energy stored in the magnet is approximately 1623.457kJ, the inductance is close to 104.23H, and the central magnetic field... The maximum magnetic field strength is 10.78 T, and the peak magnetic field strength is 13.04 T. Under this condition, the product of the highest magnetic field gradient along the axis is greater than or equal to... This achieves the design goals of high field strength and high gradient.

[0034] like Figures 1 to 6 As shown, Embodiment 2 of the present invention provides a method for realizing a gradient field based on the aforementioned large-aperture, high-field-strength, and high-gradient superconducting magnet structure. This method mainly achieves the required magnetic field characteristics under large-aperture constraints through specific coil arrangements and energizing strategies.

[0035] In this embodiment, the room temperature aperture size of the superconducting magnet winding 1 is first determined, and its room temperature aperture is designed to be greater than or equal to 200 mm to meet the requirements of large-scale experimental conditions. Meanwhile, to simplify the power supply system and ensure magnetic field synchronization, the superconducting magnet winding 1 is configured to use a single power supply.

[0036] To achieve a high field strength in the central region, this embodiment employs a coaxial nesting strategy. Specifically, the first forward coil 101, the second forward coil 102, and the third forward coil 103 are coaxially nested. This multi-layered nesting structure effectively superimposes the magnetic fields generated by each coil, thereby significantly increasing the central magnetic field strength. Furthermore, to increase the peak value of the magnetic field gradient product along the center line, the upper surfaces of the first forward coil 101, the second forward coil 102, and the third forward coil 103 are strictly controlled to be on the same horizontal plane.

[0037] To further optimize the magnetic field gradient distribution, this embodiment introduces a reverse coil configuration. A first forward coil 101 and a first reverse coil 104 are coaxially wound on a first coil frame 109, with the first reverse coil 104 located at the upper end of the first coil frame 109 and the first forward coil 101 at the lower end. During energization, the current directions of the first forward coil 101 and the first reverse coil 104 are opposite. This reverse current configuration generates a magnetic field cancellation or enhancement effect in a specific region, thereby significantly increasing the peak value of the magnetic field gradient product along the centerline.

[0038] Regarding the layout of the superconducting material, based on the magnetic field strength requirements of different regions, this embodiment configures the first forward coil 101 and the second forward coil 102 as follows: The coil is designed to withstand a high magnetic field strength; the third positive coil 103 located on the outer layer is configured with the first negative coil 104 used for gradient adjustment. Coil.

[0039] Based on the above configuration, when energizing the magnet described in this embodiment, the target current is set to 176.5A. At this operating current, the theoretical total energy stored in the magnet is approximately 1623.457 kJ, and the system inductance is close to 104.23 H. Finally, at the center point... The central magnetic field strength generated at this location is 10.78 T, and the overall peak magnetic field reaches 13.04 T. Crucially, this configuration ensures that the product of the highest magnetic field gradient along the axis is greater than or equal to... This satisfies the requirements for high field strength and high gradient applications under large apertures.

[0040] like Figure 1 , Figure 3 and Figure 5As shown, Embodiment 3 of the present invention further describes in detail the mechanical assembly and positioning details of the superconducting magnet to ensure structural stability under high electromagnetic force environment.

[0041] In this embodiment, to ensure coaxiality and assembly accuracy between the coil frames, two locating pin holes are provided on each of the first coil frame 109, the second coil frame 110, and the third coil frame 111. Furthermore, in the design of the connection interface, a locating step is machined on the inner side of the connection surface between the first coil frame 109 and the bottom flange 112, and a corresponding locating step is also machined on the corresponding connection surface of the bottom flange 112. The precise positioning of the frame assembly is achieved through the cooperation of the locating pin holes and the locating steps.

[0042] To prevent potential risks caused by the accumulation of cryogenic liquid, a liquid helium leakage hole is specially provided on the bottom flange 112 to ensure smooth flow and release of liquid helium. Regarding the mechanical structure of the joint support, considering the effects of thermal expansion and contraction and electromagnetic forces, a sliding limiting device is provided on the other side of the first joint support 120. This device allows the joint to undergo thermal displacement within a certain range to release stress while maintaining necessary limiting support.

[0043] In the mechanical installation of the magnet protection system, the diode group 118 is not directly suspended, but is fixed to the upper end face of the upper flange 114 through a specially designed diode fixture 119. This installation method ensures the mechanical stability of the diode group 118 during magnet operation and prevents connection failure caused by vibration or Lorentz force.

[0044] Furthermore, for the insulation and protection of the magnet support rod 130, this embodiment provides a sleeve made of G10 material on the outer side of the magnet support rod 130. Insulating gaskets are provided between the first connector support 120, the second connector support 121, the third connector support 122, the fourth connector support 123, the fifth connector support 124, the sixth connector support 125, the seventh connector support 126, the eighth connector support 127, the ninth connector support 128, and the tenth connector support 129 and their respective connected frames. The insulating gaskets are specifically made of polyimide or aluminum nitride ceramic material. Simultaneously, insulating sleeves are fitted onto the outer sides of the fixing screws on each of the above connector supports, thus constructing a complete electrical insulation system.

[0045] Matters not covered in this invention are common knowledge. The above embodiments are only for illustrating the technical concept and features of this invention, and are intended to enable those skilled in the art to understand the content of this invention and implement it accordingly. They should not be construed as limiting the scope of protection of this invention. All equivalent changes or modifications made in accordance with the spirit and essence of this invention should be covered within the scope of protection of this invention.

Claims

1. A high field high field gradient superconducting magnet of large bore, characterized in that, The superconducting magnet winding and the magnet skeleton; the superconducting magnet winding includes a first positive coil, a second positive coil, a third positive coil and a first negative coil, and the magnet skeleton includes at least a first coil skeleton; wherein the first positive coil, the second positive coil and the third positive coil are coaxially nested; the first positive coil and the first negative coil are coaxially wound on the first coil skeleton, and the first positive coil and the first negative coil are configured to have opposite current directions; the first positive coil is wound on the lower end of the first coil skeleton, and the first negative coil is wound on the upper end of the first coil skeleton; the upper ends of the first positive coil, the second positive coil and the third positive coil are located on the same horizontal plane.

2. A high field large bore superconducting magnet according to claim 1, wherein, The material of the first forward coil and the second forward coil is ; the material of the third forward coil and the first reverse coil is ; the inner diameter of the first forward coil and the first reverse coil is the same.

3. The large-bore high-field gradient superconducting magnet of claim 1, wherein, The magnet skeleton further includes a second coil skeleton, a third coil skeleton, a bottom flange, a right flange, an upper flange and a left flange; the second positive coil is wound on the second coil skeleton, and the third positive coil is wound on the third coil skeleton.

4. A high field large bore superconducting magnet according to claim 3, wherein, The bottom of the first coil skeleton, the bottom of the second coil skeleton and the bottom of the third coil skeleton are connected by the bottom flange; the top of the first coil skeleton is connected with a magnet suspension rod group through the upper flange.

5. A high field large bore superconducting magnet according to claim 4, wherein, The right flange and the left flange are attached to the middle part of the first coil skeleton, and the right flange and the left flange are located on the same plane; the top of the second coil skeleton and the top of the third coil skeleton are connected by the right flange and the left flange; a magnet support rod is fixedly connected between the right flange and the left flange.

6. A high field large bore superconducting magnet according to claim 1, wherein, The superconducting magnet winding further includes a first prestressed layer, a second prestressed layer, a third prestressed layer and a fourth prestressed layer; the first prestressed layer is wound on the outside of the first positive coil, the second prestressed layer is wound on the outside of the second positive coil, the third prestressed layer is wound on the outside of the third positive coil, and the fourth prestressed layer is wound on the outside of the first negative coil; the first prestressed layer, the second prestressed layer, the third prestressed layer and the fourth prestressed layer are made of stainless steel or aluminum alloy.

7. A high field large bore superconducting magnet according to claim 1, wherein, The superconducting magnet winding further includes a first joint support, a second joint support, a third joint support, a fourth joint support, a fifth joint support, a sixth joint support, a seventh joint support, an eighth joint support, a ninth joint support and a tenth joint support; the sixth joint support is located at the in-out line on the inner side of the upper end of the first positive coil, and the fifth joint support is located at the in-out line on the outer side of the upper end of the first positive coil; the tenth joint support is located at the in-out line on the outer side of the upper end of the first negative coil, and the seventh joint support is located at the in-out line on the inner side of the lower end of the first negative coil.

8. A high field large bore superconducting magnet according to claim 7, wherein, The fourth joint support is located at the inner side access line of the upper end of the second forward coil, the third joint support is located at the outer side access line of the upper end of the second forward coil, and the eighth joint support is located at the middle section access line of the upper end of the second forward coil; the second joint support is located at the inner side access line of the upper end of the third forward coil, the first joint support is located at the outer side access line of the upper end of the third forward coil, and the ninth joint support is located at the middle section access line of the upper end of the third forward coil.

9. The large-bore high-field gradient superconducting magnet of claim 1, wherein, The low-temperature device comprises an outer Dewar, a cold shield and a helium tank; the helium tank is arranged inside the cold shield, and the cold shield is arranged inside the outer Dewar; the superconducting magnet winding is suspended on the cold shield, the outer Dewar and the helium tank through the magnet suspension device.

10. A high field large bore superconducting magnet according to claim 3, wherein, Glass fiber winding insulation layers are arranged between the first forward coil and the first reverse coil and the cylindrical wall of the first coil framework, between the second forward coil and the cylindrical wall of the second coil framework, and between the third forward coil and the cylindrical wall of the third coil framework; polyimide or mica insulation layers are arranged between the first forward coil and the first reverse coil and the framework flange of the first coil framework, between the second forward coil and the framework flange of the second coil framework, and between the third forward coil and the framework flange of the third coil framework.

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