A superconducting magnet

Abstract

The application provides a superconducting magnet, and relates to the technical field of electromagnets, and the superconducting magnet comprises a first superconducting coil assembly, a second superconducting coil assembly and a refrigerator. The first superconducting coil assembly and the second superconducting coil assembly are arranged oppositely and separately from each other, and a scanning magnetic field space is formed between the first superconducting coil assembly and the second superconducting coil assembly. An intermediate support frame is arranged between the first superconducting coil assembly and the second superconducting coil assembly. The refrigerator is arranged on the first superconducting coil assembly, and the refrigerator conducts cold to the first superconducting coil assembly and the second superconducting coil assembly through a cold conducting assembly. The cold conducting assembly comprises a first cold conducting piece arranged on the first superconducting coil assembly, a main cold conducting copper plate arranged on the intermediate support frame, a second cold conducting piece arranged on the second superconducting coil assembly and a cold conducting strip sequentially connected with the first cold conducting piece, the main cold conducting copper plate and the second cold conducting piece. The application can solve the technical problem of low efficiency caused by interface contact thermal resistance in the prior art, which is caused by the traditional pasting type cold conducting assembly through medium pasting.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnet, in particular to a superconducting magnet. BACKGROUND

[0002] The superconducting magnet has become the core power source in the fields of single crystal growth (such as semiconductor wafer preparation), medical imaging (MRI precise imaging), magnetic levitation transportation and the like due to the core characteristics of zero-resistance current carrying and strong magnetic field confinement, and the structural stability of the superconducting magnet directly determines the performance boundary.

[0003] At present, the superconducting magnet generally adopts an aluminum integral type framework to fix the coil, and due to the anisotropy of the thermal expansion coefficients of the materials such as the superconducting coil and the insulation layer, thermal stress concentration is prone to occur in the use process, which leads to deformation of the framework, and further affects the performance of the superconducting magnet. In addition, the superconducting magnet generally adopts a pasting type cold conducting assembly, and due to the interface contact thermal resistance caused by the medium pasting, the efficiency is relatively low, so that it is difficult for the superconducting magnet to maintain a stable low-temperature environment in the working process, which affects the stability and durability of the performance. In addition, the suspension system of the superconducting magnet is not stable enough due to the limitation of the structural stiffness and vibration isolation design, and is easily affected by external vibration and impact, which further weakens the reliability and safety of the superconducting magnet. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a superconducting magnet to solve the problem that the traditional pasting type cold conducting assembly is prone to cause interface contact thermal resistance and leads to low efficiency.

[0005] In one aspect, the present application provides a superconducting magnet, which comprises:

[0006] a first superconducting coil assembly, a second superconducting coil assembly and a refrigerator;

[0007] The first superconducting coil assembly and the second superconducting coil assembly are arranged opposite to each other and form a scanning magnetic field space therebetween;

[0008] An intermediate support frame is arranged between the first superconducting coil assembly and the second superconducting coil assembly;

[0009] The refrigerator cools the first superconducting coil assembly and the second superconducting coil assembly through a cold conducting assembly;

[0010] The cold conducting assembly comprises a first cold conducting member arranged on the first superconducting coil assembly, a main cold conducting copper plate arranged on the intermediate support frame, a second cold conducting member arranged on the second superconducting coil assembly, and a cold conducting strip sequentially connected with the first cold conducting member, the main cold conducting copper plate and the second cold conducting member.

[0011] Compared with the prior art, the application has the beneficial effects that: the refrigerating machine is used to guide the cold through the cold guiding assembly, without the need for the pasting type cold guiding, and the cold guiding assembly comprises a first cold guiding member arranged on the first superconducting coil assembly, a main cold guiding copper plate arranged on the intermediate support frame, a second cold guiding member arranged on the second superconducting coil assembly, and a cold guiding strip sequentially connected with the first cold guiding member, the main cold guiding copper plate and the second cold guiding member, through the multi-level cold guiding structure, the cooling efficiency is greatly improved, the stable operation of the superconducting magnet in the low-temperature environment is ensured, and the technical problem that the traditional pasting type cold guiding assembly is pasted through the medium, and the interface contact thermal resistance is easy to cause the low efficiency is solved.

[0012] According to an aspect of the above technical solution, the first superconducting coil assembly comprises a first framework and a first superconducting coil spirally wound on the first framework, the second superconducting coil assembly comprises a second framework and a second superconducting coil spirally wound on the second framework, and the first framework, the intermediate support frame and the second framework are sequentially connected, and the material of the first framework, the intermediate support frame and the second framework is stainless steel material.

[0013] According to an aspect of the above technical solution, the first cold guiding member comprises a first aluminum strip, a first copper skin clamp and a first cold guiding copper ring, the first aluminum strip is wound on the first superconducting coil, the first copper skin clamp is arranged around the first aluminum strip, and the first cold guiding copper ring is arranged on the side of the first framework away from the intermediate support frame; the second cold guiding member comprises a second aluminum strip, a second copper skin clamp and a second cold guiding copper ring, the second aluminum strip is wound on the second superconducting coil, the second copper skin clamp is arranged around the second aluminum strip, and the second cold guiding copper ring is arranged on the side of the second framework away from the intermediate support frame.

[0014] According to an aspect of the above technical solution, the main cold guiding copper plate is connected with the first copper skin clamp and the second copper skin clamp through a first cold guiding soft connecting member, and the main cold guiding copper plate is also connected with the first cold guiding copper ring and the second cold guiding copper ring through the cold guiding strip.

[0015] According to an aspect of the above technical solution, a plurality of wire connecting cups and heat sink members are arranged on the main cold guiding copper plate, the outgoing superconducting tapes on the first superconducting coil and the second superconducting coil are connected with hard superconducting leads through soft superconducting tapes, the outgoing superconducting tapes and the soft superconducting tapes are connected through the wire connecting cups, and the soft superconducting tapes and the hard superconducting leads are connected through the heat sink members.

[0016] According to an aspect of the above technical solution, the first superconducting coil assembly and the second superconducting coil assembly are arranged in a cold shield, the cold shield is arranged in a Dewar vacuum cylinder, the refrigerator is arranged on the Dewar vacuum cylinder and the cold shield, and the first-stage cold head and the second-stage cold head of the refrigerator are connected with the cold shield and the cold lead assembly respectively.

[0017] According to an aspect of the above technical solution, the superconducting magnet further comprises a magnet suspension mechanism, the magnet suspension mechanism comprises a first pull rod assembly and a second pull rod assembly, the first pull rod assembly comprises a vertical pull rod with one end connected to the top inner wall of the Dewar vacuum cylinder and the other end connected to the outer wall of the intermediate support frame, and an epoxy pull rod with one end connected to the top inner wall of the Dewar vacuum cylinder and the other end connected to the top outer wall of the cold shield, the second pull rod assembly comprises a diagonal pull rod with one end connected to the side wall of the Dewar vacuum cylinder and the other end connected to the outer wall of the intermediate support frame, and the diagonal pull rod and the vertical pull rod and the epoxy pull rod are uniformly distributed along the outer wall of the intermediate support frame in the circumferential direction.

[0018] According to an aspect of the above technical solution, the radii of the first superconducting coil and the second superconducting coil are greater than the center distance between the first superconducting coil and the second superconducting coil.

[0019] According to an aspect of the above technical solution, the first superconducting coil assembly, the intermediate support frame, the second superconducting coil assembly, and the cold lead assembly are surrounded by a heat shield, and the two ends of the heat shield are connected to the ends of the first skeleton and the second skeleton that are away from each other. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 FIG. 1 is a structural schematic diagram of a superconducting magnet in an embodiment of the present application;

[0021] Fig. 2 FIG. 2 is a sectional view of a superconducting magnet in an embodiment of the present application;

[0022] EXPLANATION OF DRAWING ELEMENT SYMBOLS:

[0023] First superconducting coil assembly 10, first skeleton 11, first superconducting coil 12, second superconducting coil assembly 20, second skeleton 21, second superconducting coil 22, intermediate support frame 30, refrigerator 40, first cold lead 41, second cold lead 42, main cold copper plate 43, cold lead strip 44, first copper foil flexible connection 45, second copper foil flexible connection 46, cold shield 50, Dewar vacuum cylinder 60, magnet suspension mechanism 70, vertical pull rod 71, epoxy pull rod 72, inclined pull rod 73, pull rod 74, thermal shield 80, fastener 90, first copper skin clamp 411, first cold copper ring 412, second copper skin clamp 421, second cold copper ring 422, first cold flexible connection 430, terminal cup 431, second cold flexible connection 432;

[0024] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] Referring to Figs. 1-2 , a superconducting magnet in an embodiment of the present application is shown, which comprises:

[0028] First superconducting coil assembly 10, second superconducting coil assembly 20, refrigerator 40;

[0029] The first superconducting coil assembly 10 and the second superconducting coil assembly 20 are separated from each other and arranged oppositely, forming a scanning magnetic field space therebetween.

[0030] Further, the first superconducting coil assembly 10 comprises a first skeleton 11 and a first superconducting coil 12 spirally wound on the first skeleton 11, and the second superconducting coil assembly 20 comprises a second skeleton 21 and a second superconducting coil 22 spirally wound on the second skeleton 21, and the first superconducting coil 12 and the second superconducting coil 22 are connected with outgoing superconducting tapes.

[0031] By way of example and not limitation, the first superconducting coil 12 and the second superconducting coil 22 can be made of low-temperature superconducting tapes spirally wound into low-temperature superconducting coils, and high-temperature superconducting coils spirally wound from relatively high-temperature superconducting tapes. Under other conditions, the production cost of the low-temperature superconducting coils can be saved by more than 75%. At the same time, the first superconducting coil assembly 10 and the second superconducting coil assembly 20 are independently arranged separately from each other. Compared with winding two superconducting coils on opposite ends of the same skeleton, the winding time and curing time of the superconducting coils can be greatly shortened, and the production efficiency of the superconducting magnet can be improved.

[0032] Further, the sizes, axial turns, and radial turns of the first superconducting coil 12 and the second superconducting coil 22 are consistent, which can form a hook-shaped magnetic field in the superconducting magnet for use in magnetic control single crystal growth.

[0033] Further, the radii of the first superconducting coil 12 and the second superconducting coil 22 are greater than the center distance between the first superconducting coil 12 and the second superconducting coil 22. For example, the radii of the first superconducting coil 12 and the second superconducting coil 22 are 2-3 times the center distance between the first superconducting coil 12 and the second superconducting coil 22. The specific value is determined according to the structure of the superconducting magnet, the magnetic field distribution, and the strength requirement.

[0034] The first superconducting coil assembly 10 and the second superconducting coil assembly 20 are provided with an intermediate support frame 30 therebetween.

[0035] Further, the materials of the first skeleton 11, the intermediate support frame 30, and the second skeleton 21 are stainless steel materials. The first skeleton 11, the intermediate support frame 30, and the second skeleton 21 are connected in sequence by a plurality of circumferentially arranged fasteners 90 to form a split skeleton. This not only improves the heat conduction performance of the superconducting coil, but also effectively solves the problem of thermal stress concentration and deformation of the aluminum material integral skeleton due to the similar cold shrinkage coefficient of stainless steel and superconducting tapes, thereby improving the stress stability of the superconducting coil after cooling.

[0036] By way of example and not limitation, the longitudinal section of the first skeleton 11 and the second skeleton 21 is an I-shaped section. The outer diameter of the first skeleton 11 and the second skeleton 21 on the side close to the intermediate support frame 30 is smaller than the outer diameter on the side away from the intermediate support frame 30. The intermediate support frame 30 includes a support ring, a first connecting ring plate, and a second connecting ring plate. The first connecting ring plate and the second connecting ring plate are respectively welded to the top end and the bottom end of the support ring. The first connecting ring plate is fixed to the bottom end of the first skeleton 11 by a plurality of circumferentially arranged fasteners 90. The second connecting ring plate is fixed to the top end of the second skeleton 21 by a plurality of circumferentially arranged fasteners 90. The top end of the first skeleton 11 and the bottom end of the second skeleton 21 are fixed by a plurality of circumferentially distributed tie rods 74. The tie rods 74 are made of stainless steel or titanium alloy.

[0037] The refrigerator 40 is arranged above the first superconducting coil assembly 10, and the refrigerator 40 conducts heat away from the first superconducting coil assembly 10 and the second superconducting coil assembly 20 through a heat conduction assembly, which comprises a first heat conduction member 41 arranged on the first superconducting coil assembly 10, a main heat conduction copper plate 43 arranged on the intermediate support frame 30, a second heat conduction member 42 arranged on the second superconducting coil assembly 20, and a heat conduction strip 44 connected to the first heat conduction member 41, the main heat conduction copper plate 43 and the second heat conduction member 42 in sequence.

[0038] Further, the first-stage cold head and the second-stage cold head of the refrigerator 40 are connected to the cold shield 50 and the heat conduction strip 44 in the heat conduction assembly respectively, and through staged refrigeration and accurate cooling, the first superconducting coil assembly 10 and the second superconducting coil assembly 20 can be kept in a low-temperature environment and isolated from external heat radiation.

[0039] Further, the first heat conduction member 41 comprises a first aluminum tape, a first copper skin clamp 411 and a first heat conduction copper ring 412, the first aluminum tape is wound around the first superconducting coil 12, the first copper skin clamp 411 is arranged around the first aluminum tape, and the first heat conduction copper ring 412 is arranged on the side of the first skeleton 11 away from the intermediate support frame 30.

[0040] Similarly, the second heat conduction member 42 comprises a second aluminum tape, a second copper skin clamp 421 and a second heat conduction copper ring 422, the second aluminum tape is wound around the second superconducting coil 22, the second copper skin clamp 421 is arranged around the second aluminum tape, and the second heat conduction copper ring 422 is arranged on the side of the second skeleton 21 away from the intermediate support frame 30.

[0041] It should be noted that the first aluminum tape and the second aluminum tape are wound around the first superconducting coil 12 and the second superconducting coil 22 respectively, because the aluminum tape has good heat conductivity and a larger cold shrinkage coefficient than the superconducting tape and the stainless steel skeleton, the aluminum tape can be tightly attached to the coil after cooling to conduct the heat of the coil away, which greatly improves the heat dissipation efficiency compared with the traditional heat dissipation in space. The first copper skin clamp 411 clamps the first aluminum tape, and the second copper skin clamp 421 clamps the second aluminum tape, to prevent the first aluminum tape and the second aluminum tape from loosening due to vibration or thermal expansion and contraction.

[0042] By way of example but not limitation, the first copper skin clamp 411 and the second copper skin clamp 421 are provided in two layers to ensure the low-temperature characteristics of the first superconducting coil 12 and the second superconducting coil 22 and increase the uniformity of the temperature of the first superconducting coil 12 and the second superconducting coil 22.

[0043] Further, the main heat conduction copper plate 43 is connected to the first copper skin clamp 411 and the second copper skin clamp 421 through first heat conduction soft connectors 430 respectively, and the main heat conduction copper plate 43 is also connected to the first heat conduction copper ring 412 and the second heat conduction copper ring 422 through the heat conduction strip 44 respectively.

[0044] It should be noted that the main cold copper plate 43 is connected with the first copper skin clamp 411 and the second copper skin clamp 421 through the first cold-lead soft connecting piece 430, the first cold-lead copper ring 412, the second cold-lead copper ring 422 and the main cold copper plate 43 are connected through the cold-lead strip 44, and the second cold head is connected through the cold-lead strip 44. In particular, the first cold-lead copper ring 412 and the second cold-lead copper ring 422 are arranged on the first framework 11 and the second framework 21 respectively, and the first copper skin clamp 411 and the second copper skin clamp 421 are arranged on the surfaces of the first superconducting coil 12 and the second superconducting coil 22 respectively, so that the temperature difference between the first framework 11 and the first superconducting coil 12 and between the second framework 21 and the second superconducting coil 22 is effectively reduced, the temperature uniformity and the temperature margin of the first superconducting coil 12 and the second superconducting coil 22 are improved, the risk of losing superconducting magnet is reduced, and the overall performance of the superconducting magnet is improved.

[0045] In addition, the main cold copper plate 43 is provided with a plurality of wiring cups 431 and heat sink pieces, the lead-out superconducting tape is connected with the hard superconducting lead through the soft superconducting tape, the lead-out superconducting tape and the soft superconducting tape are connected through the wiring cup 431, the soft superconducting tape and the hard superconducting lead are connected through the heat sink piece, the hard superconducting lead is connected with the top surface of the cold screen 50 through the current lead interface, and the current lead joint is arranged on the top surface of the cold screen 50 and connected with the first cold head of the refrigerator 40 through the cold-lead sheet.

[0046] It should be noted that the lead-out superconducting tape is connected with the hard superconducting lead through the soft superconducting tape, which can effectively alleviate the stress concentration problem caused by thermal expansion and cold contraction and the problem of affecting the current-carrying capacity of each connection surface of the hard superconducting lead due to the cold contraction of the framework, and can effectively reduce the generation of heat leakage phenomenon caused by direct connection of the hard superconducting lead. Furthermore, the arrangement of the wiring cup 431 not only facilitates the connection of the lead-out superconducting tape and the hard superconducting lead, but also further enhances the cold-lead effect and reduces the heat loss of the lead-out superconducting tape.

[0047] Further, the first superconducting coil assembly 10, the intermediate support frame 30, the second superconducting coil assembly 20, the outer periphery of the cold lead assembly is provided with a heat shield 80, and the two ends of the heat shield 80 are connected to the ends of the first skeleton 11 and the second skeleton 21 away from each other, which not only effectively reduces the heat radiation of the cold shield 50 to the first superconducting coil 12 and the second superconducting coil 22, greatly reduces the heat leakage of the cold shield 50 to the superconducting coil, ensures that the superconducting magnet can stably operate at extremely low temperature, but also makes the structure of the superconducting magnet more compact and easy to install, thereby improving the production efficiency of the superconducting magnet. Secondly, the heat shield 80 is made of aluminum plate material, which has good thermal conductivity and mechanical strength, can effectively lead out the cold energy generated by the first superconducting coil 12 and the second superconducting coil 22 during operation, and further improve the cooling efficiency of the first superconducting coil 12 and the second superconducting coil 22. Furthermore, the outer wall of the heat shield 80 is attached with multiple layers of insulating materials to further enhance its thermal insulation performance, so that the first superconducting coil 12 and the second superconducting coil 22 can better maintain in the required low temperature environment, thereby improving the stability and reliability of the superconducting magnet.

[0048] In addition, the first superconducting coil assembly 10, the second superconducting coil assembly 20, the intermediate support frame 30, the cold lead assembly and the heat shield 80 are arranged in the cold shield 50, and the cold shield 50 is arranged in the Dewar vacuum cylinder 60, and the refrigerator 40 is arranged on the Dewar vacuum cylinder 60 and the cold shield 50.

[0049] For example, but not limited to, the Dewar vacuum cylinder 60 can be a closed hollow circular column structure to form a vacuum environment, and the cold shield 50 can be a hollow circular column structure to form a low temperature environment. The first level cold head of the refrigerator 40 and the top surface of the cold shield 50 are connected in sequence through a copper ring and a first copper foil soft connection 45, so as to cool the temperature of the cold shield 50 to about 50K. The second level cold head of the refrigerator 40 and the top end surface of the first skeleton 11 are connected in sequence through a cold lead strip 44, a second copper foil soft connection 46 and a first cold lead copper ring 412, so as to cool the temperature to below 20K, or even to about 4K.

[0050] In addition, the superconducting magnet further comprises a magnet suspension mechanism 70, the magnet suspension mechanism 70 comprises a first pull rod assembly and a second pull rod assembly, the first pull rod assembly comprises a vertical pull rod 71 connected to the top inner wall of the Dewar vacuum cylinder 60 at one end and connected to the outer wall of the intermediate support frame 30 at the other end, and an epoxy pull rod 72 connected to the top inner wall of the Dewar vacuum cylinder 60 at one end and connected to the top outer wall of the cold shield 50 at the other end, the second pull rod assembly comprises a diagonal pull rod 73 connected to the side wall of the Dewar vacuum cylinder 60 at one end and connected to the outer wall of the intermediate support frame 30 at the other end, the diagonal pull rod 73 and the vertical pull rod 71 are evenly distributed along the outer wall of the intermediate support frame 30 in a circumferential direction respectively, and the epoxy pull rod 72 is evenly distributed along the top outer wall of the cold shield 50 in a circumferential direction, so that the load and stress are symmetrically dispersed.

[0051] Further, the vertical pull rod 71 is connected with the inner wall of the Dewar vacuum cylinder 60 through the second cold-lead soft connection 432 to reduce the external heat transfer into the superconducting magnet.

[0052] Preferably, the materials of the inclined pull rod 73 and the vertical pull rod 71 and the epoxy pull rod 72 are all epoxy resin, which is a high insulation material and has good heat transfer effect and relative structural strength. In addition, the number of the vertical pull rod 71 and the epoxy pull rod 72 is more than that of the inclined pull rod 73. For example, the vertical pull rod 71 can be 6, the inclined pull rod 73 can be 4, and the epoxy pull rod 72 can be 6, which is determined according to the mechanical strength and stress of the first skeleton 11, the second skeleton 21, the intermediate support frame 30, the cold screen 50, etc.

[0053] It should be noted that the vertical pull rod 71 is mainly used to bear the axial load and gravity of the intermediate support frame, the skeleton, and the superconducting coil to prevent sinking; the epoxy pull rod 72 is mainly used to bear the gravity of the cold screen 50; and the inclined pull rod 73 is mainly used to resist lateral vibration / impact during transportation of the superconducting magnet and to build a three-dimensional protective network in the axial and radial directions.

[0054] That is, by using multiple vertical pull rods 71 and inclined pull rods 73, the weight of the superconducting magnet is effectively dispersed, and the stability and carrying capacity of the magnet suspension mechanism 70 are improved. Compared with the traditional metal vertical pull rod and epoxy vertical pull rod design, the optimized suspension method not only reduces the number of pull rods and lowers material costs, but also simplifies the installation and maintenance process and improves work efficiency. Secondly, the materials of the vertical pull rod 71 and the inclined pull rod 73 are epoxy resin, which has good insulation performance and mechanical strength, can effectively prevent current leakage and mechanical damage, and thus ensures the safe operation of the superconducting magnet. In addition, the use of epoxy resin also improves the corrosion resistance and durability of the magnet suspension mechanism 70, prolonging the service life of the superconducting magnet. Furthermore, by adding multiple epoxy pull rods 72 between the top end of the cold screen 50 and the inner wall of the top end of the Dewar vacuum cylinder 60, the carrying capacity and stability of the cold screen 50 can be further enhanced, and the overall stiffness and shock resistance of the superconducting magnet can be improved. Finally, the vertical pull rod 71 is connected with the inner wall of the Dewar vacuum cylinder 60 through the second cold-lead soft connection 432, which realizes further heat conduction of the Dewar vacuum cylinder 60, helps to improve the cooling efficiency of the Dewar vacuum cylinder 60, reduces energy consumption, and thus improves the overall performance and economy of the superconducting magnet.

[0055] In addition, the side wall of the cold screen 50 is provided with a plurality of avoiding holes, and the inclined pull rod 73 is connected with the side wall of the Dewar vacuum cylinder 60 through the avoiding holes.

[0056] To sum up, the superconducting magnet in the above-mentioned embodiments of the present application adopts a refrigerator to conduct cooling through a cooling conducting assembly, without the need for a pasting type cooling conducting assembly, and the cooling conducting assembly comprises a first cooling conducting member arranged on the first superconducting coil assembly, a main cooling copper plate arranged on the intermediate support frame, a second cooling conducting member arranged on the second superconducting coil assembly, and a cooling conducting strip sequentially connected with the first cooling conducting member, the main cooling copper plate and the second cooling conducting member, through the multi-level cooling conducting structure, the cooling efficiency is greatly improved, the stable operation of the superconducting magnet in a low-temperature environment is ensured, and thus the technical problem of the traditional pasting type cooling conducting assembly through the medium pasting, which is easy to cause the interface contact thermal resistance to result in low efficiency, is solved.

[0057] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above-mentioned embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that, for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A superconducting magnet, characterized in that, The superconducting magnet includes: First superconducting coil assembly, second superconducting coil assembly, and refrigerator; The first superconducting coil assembly and the second superconducting coil assembly are separated from each other and arranged opposite to each other, forming a scanning magnetic field space between them; An intermediate support frame is provided between the first superconducting coil assembly and the second superconducting coil assembly. The first superconducting coil assembly includes a first frame and a first superconducting coil spirally wound on the first frame. The second superconducting coil assembly includes a second frame and a second superconducting coil spirally wound on the second frame. The first frame, the intermediate support frame, and the second frame are connected in sequence. The first frame, the intermediate support frame, and the second frame are all made of stainless steel. The radii of the first superconducting coil and the second superconducting coil are both greater than the center distance between the first superconducting coil and the second superconducting coil. The refrigerator provides cooling to the first superconducting coil assembly and the second superconducting coil assembly through a cooling conductive component; The cooling assembly includes a first cooling component disposed on the first superconducting coil assembly, a main cooling copper plate disposed on the intermediate support frame, a second cooling component disposed on the second superconducting coil assembly, and cooling strips sequentially connecting the first cooling component, the main cooling copper plate, and the second cooling component. The first cooling component includes a first aluminum strip, a first copper clamp, and a first cooling copper ring. The first aluminum strip is wound around the first superconducting coil, the first copper clamp is surrounding the first aluminum strip, and the first cooling copper ring is located on the side of the first frame away from the intermediate support frame. The second cooling component includes a second aluminum strip, a second copper clamp, and a second cooling copper ring. The second aluminum strip is wound around the second superconducting coil, the second copper clamp is surrounding the second aluminum strip, and the second cooling copper ring is located on the side of the second frame away from the intermediate support frame. The main cooling copper plate is connected to the first copper clamp and the second copper clamp respectively through the first cooling flexible connector, and the main cooling copper plate is also connected to the first cooling copper ring and the second cooling copper ring respectively through the cooling strip.

2. The superconducting magnet according to claim 1, characterized in that, The main cold copper plate is provided with a plurality of junction cups and heat sinks. The lead-out superconducting tapes on the first superconducting coil and the second superconducting coil are connected to the rigid superconducting leads through flexible superconducting tapes. The lead-out superconducting tapes and the flexible superconducting tapes are connected through the junction cups. The flexible superconducting tapes and the rigid superconducting leads are connected through the heat sinks.

3. The superconducting magnet according to claim 1, characterized in that, The first superconducting coil assembly and the second superconducting coil assembly are arranged inside a cold screen, which is located inside a Dewar vacuum cylinder. The refrigerator is installed on the Dewar vacuum cylinder and the cold screen. The primary cold head and the secondary cold head of the refrigerator are respectively connected to the cold screen and the cooling assembly.

4. The superconducting magnet according to claim 3, characterized in that, The superconducting magnet also includes a magnet suspension mechanism, which includes a first tie rod assembly and a second tie rod assembly. The first tie rod assembly includes a vertical tie rod with one end connected to the inner top wall of the Dewar vacuum cylinder and the other end connected to the outer wall of the intermediate support frame, and an epoxy tie rod with one end connected to the inner top wall of the Dewar vacuum cylinder and the other end connected to the outer top wall of the cold shield. The second tie rod assembly includes an inclined tie rod with one end connected to the side wall of the Dewar vacuum cylinder and the other end connected to the outer wall of the intermediate support frame. The inclined tie rod, the vertical tie rod, and the epoxy tie rod are all evenly spaced along the circumferential direction of the outer wall of the intermediate support frame.

5. The superconducting magnet according to claim 1, characterized in that, The first superconducting coil assembly, the intermediate support frame, the second superconducting coil assembly, and the cooling assembly are all surrounded by a heat insulation screen, and the two ends of the heat insulation screen are respectively connected to the ends of the first frame and the second frame that are furthest from each other.

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