Multi-coil high-temperature superconducting magnet framework with gradient distribution of materials and design method

Abstract

The invention provides a multi-coil high-temperature superconducting magnet framework with materials distributed in a gradient mode and a design method. The multi-coil high-temperature superconducting magnet framework comprises a plurality of metal discs which are arranged between a coil inner diameter metal ring and a coil outer diameter metal ring in the axial direction at intervals. The mechanical strength of the metal discs is increased from the two ends to the middle in the axial direction of the magnet framework, and the mechanical strength of the coil outer diameter metal ring is larger than that of the coil inner diameter metal ring; the conductivity of the metal disc is greater than that of the coil inner diameter metal ring and is also greater than that of the coil outer diameter metal ring; and the conductivity of the plurality of metal discs is increased from the two ends to the middle along the axial direction of the magnet framework. Through the multi-material stacking design of the metal disc and the gradient distribution design of the metal disc material in the axial direction of the magnet, on the premise that the mechanical strength of the framework is guaranteed, gradient distribution of the temperature of the multi-coil high-temperature superconducting magnet in the rapid discharging process is achieved, the risk of over-current burnout of the two ends of the magnet is reduced, and the service life of the magnet is prolonged. And the stability and the reliability of the magnet in a high-field application background are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of superconducting coil structure technology, specifically to a multi-coil high-temperature superconducting magnet skeleton with material gradient distribution and its design method. Background Technology

[0002] High-temperature superconducting tapes are the preferred material for large, high-field magnets due to their advantages such as strong current-carrying capacity, high operating temperature, and relatively low production cost. However, high-temperature superconducting tapes exhibit slow quench propagation speed and a large temperature margin, making it difficult for quench to propagate quickly once it occurs, easily leading to localized hot spots and even coil burnout. Therefore, it is necessary to rapidly release the stored energy after detecting quench in the magnet. Critical temperature, critical magnetic field, and critical current are three important parameters of superconductors. When any of these parameters exceeds its critical value, the superconducting magnet will experience quench.

[0003] Using an external storage resistor to release energy from the magnet is a simple and feasible method. Utilizing a metallic support framework for a high-temperature superconducting magnet can effectively conduct heat to the cooling magnet and transfer some energy through electromagnetic coupling during the magnet's discharge through the storage resistor, accelerating the discharge process. However, for multi-coil high-temperature superconducting magnets, the high magnetic fields at both ends lead to extensive current penetration, making overcurrent and quenching more likely. While accelerating discharge, the eddy currents within the metallic framework generate heat, causing a temperature rise in the magnet and increasing the current penetration area, thus increasing the risk of overcurrent and quenching at both ends. Secondary quenching often causes more severe damage, even burning out the magnet. Therefore, rationally designing the magnet framework material to distribute the magnet's temperature rise appropriately and reduce the risk of quenching and burnout is crucial. In addition, the framework design must consider mechanical support requirements. How to improve the magnet's safety and stability while meeting mechanical support requirements is a key issue in magnet framework design.

[0004] A Chinese patent application with publication number CN114496458B discloses a coil frame structure for conductive cooling of a superconducting magnet. The structure includes a main coil frame and a shielding coil frame arranged coaxially from the inside out. Both the main coil frame and the shielding coil frame are made of metal. The main coil frame has end caps A at both ends. There are two shielding coil frames, symmetrically arranged axially on both sides of the main coil frame. Each shielding coil frame has an end cap B radially inwardly positioned, covering the outside of end cap A. The inner circumferential region of end cap B is connected to end cap A. A plurality of tie rods are evenly distributed circumferentially between the two shielding coil frames.

[0005] The aforementioned patent documents describe a coil frame mechanical structure design and manufacturing assembly technology. The entire coil frame is made of aluminum alloy. The mechanical structure design reduces the overall weight of the magnet, and a cold-conducting plate provides low temperature. The goal is to provide a simple coil frame structure with good thermal conductivity for conductive cooling of superconducting magnets. However, this approach cannot meet the requirements for accelerating magnet discharge and improving the safety and stability of magnet operation in high-field multi-coil systems while satisfying the mechanical strength requirements at different positions of the magnet.

[0006] Chinese patent application CN218548116U discloses a high-field superconducting magnet coil and its frame. The disclosed high-field superconducting magnet frame includes a frame body and a connector plate. The frame body includes a winding region and a non-winding region, with an end plate positioned between the winding and non-winding regions. The range of the winding region is adjustable. The connector plate is a superconducting connector fixing plate located at the outer end of the non-winding region. Several through holes are spaced apart on the winding region. These technical features effectively mitigate coil damage during quench training and enhance the coil's ability to withstand high voltage.

[0007] The aforementioned patent documents focus on designing the mechanical structure and winding connections of the high-field coil and frame, aiming only to address the electromagnetic stress of the magnet under high fields and effectively mitigate damage to the quench coil. However, they cannot achieve a temperature gradient distribution to reduce the risk of the magnet burning out during rapid discharge while ensuring that the frame can withstand the electromagnetic force.

[0008] A Chinese patent application with publication number CN208706355U discloses a superconducting magnet composite framework made of metal and insulating materials. It includes a superconducting magnet framework, wherein the superconducting magnet framework is composed of a framework for winding superconducting coils made of metal and insulating materials, and a coolant container, with the coolant container and framework being integrally integrated.

[0009] In the aforementioned patent documents, the design of integrating the coolant container and the frame into one unit is simple to process, easy to assemble, and produces a high-quality composite magnet frame. However, it cannot simultaneously provide effective support for high-field magnets while accelerating the magnet discharge speed and reducing the risk of quench burnout.

[0010] Currently, there is an urgent need in the market for a superconducting magnet frame that can meet the mechanical strength requirements of different positions of the magnet in high-field multi-coil systems, accelerate magnet discharge and improve the safety and stability of magnet operation; and achieve a temperature gradient distribution to reduce the risk of magnet burnout during rapid discharge while ensuring that the frame can withstand electromagnetic forces. Summary of the Invention

[0011] To address the shortcomings of existing technologies, the purpose of this invention is to provide a multi-coil high-temperature superconducting magnet framework with a material gradient distribution.

[0012] According to the present invention, a multi-coil high-temperature superconducting magnet frame with a material gradient distribution includes a metal disk, an inner diameter metal ring, and an outer diameter metal ring. The metal disk is installed between the inner diameter metal ring and the outer diameter metal ring, and multiple metal disks are axially spaced between the inner diameter metal ring and the outer diameter metal ring. The mechanical strength of the multiple metal disks increases from both ends to the middle along the axial direction of the magnet frame, and the mechanical strength of the outer diameter metal ring is greater than that of the inner diameter metal ring. The electrical conductivity of the metal disk is greater than that of both the inner diameter metal ring and the outer diameter metal ring. The electrical conductivity of the multiple metal disks increases from both ends to the middle along the axial direction of the magnet frame.

[0013] Preferably, the metal disk is made of stainless steel, brass and silver stacked along the axial direction of the magnet frame; the higher the proportion of stainless steel in the metal disk, the higher the mechanical strength of the metal disk, and the higher the proportion of silver, the higher the electrical conductivity of the metal disk.

[0014] Preferably, the metal disk is formed by stacking stainless steel layers, brass layers, silver layers, brass layers, and stainless steel layers from bottom to top along the axial direction of the magnet frame.

[0015] Preferably, the thickness of the silver layer is equal to the thickness of the single stainless steel layer, and the ratio of the silver layer thickness to the metal disk thickness is [value missing]. k .

[0016] Preferably, the multiple metal disks have the same thickness, and the material thickness of the metal disks at different positions is proportional to... k satisfy: The metal disks are numbered 1 to 1 along the axial direction of the magnet frame from top to middle. n +1, no. i The material thickness ratio of the metal disks is: k Designed as follows: .

[0017] Preferably, the outer diameter metal ring of the coil is made of stainless steel.

[0018] Preferably, the inner diameter metal ring of the coil is made of aluminum alloy.

[0019] Preferably, both the outer surface of the inner diameter metal ring of the coil and the inner surface of the outer diameter metal ring of the coil are provided with slots, and the metal disk is embedded in the slots on the outer surface of the inner diameter metal ring of the coil and the inner surface of the outer diameter metal ring of the coil.

[0020] According to the present invention, a design method for a multi-coil high-temperature superconducting magnet skeleton with material gradient distribution is provided, the method comprising the following steps: Complete the dimensional design of the inner diameter metal ring and the outer diameter metal ring of the coil according to the design requirements; Complete the multi-layer stacking design of the metal disks; Complete the material gradient distribution design for multiple metal disks.

[0021] Preferably, in designing the material gradient distribution of multiple metal disks, the thickness of the metal disk at each location remains the same. The material thickness ratio of the metal disks at different locations is adjusted according to design requirements. k .

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the multi-material stacking design of the metal disks between the disc coils and the gradient distribution design of the metal disk materials along the magnet axis, enables the multi-coil high-temperature superconducting magnet to achieve a temperature gradient distribution during rapid discharge while ensuring the mechanical strength of the skeleton. This reduces the risk of overcurrent burnout at both ends of the magnet and significantly improves the stability and reliability of the magnet in high-field applications. Attached Figure Description

[0023] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram illustrating the supporting frame structure of the multi-coil high-temperature superconducting magnet, which is the main feature of this invention. Figure 2 This invention primarily illustrates the magnetic field distribution of a multi-coil high-temperature superconducting magnet; Figure 3 The present invention mainly demonstrates the discharge curves of the coil when using copper with different residual resistances; Figure 4 This invention primarily illustrates the uniform current density distribution of a multi-coil high-temperature superconducting magnet. Figure 5 The main feature of this invention is the coil discharge curves of whether or not a metal ring and a metal disk are used; Figure 6 This is a schematic diagram illustrating the multi-layer stacked structure of the metal disks, which is the main feature of this invention. Figure 7 This is a schematic diagram illustrating the metal frame installation structure, which is the main feature of this invention. Figure 8 This is a material distribution diagram of the metal disk of the magnet composed of double-coil coils, which is the main embodiment of this invention. Figure 9 This invention mainly illustrates the coil discharge curves under two schemes in Embodiment 2; Figure 10 The magnet temperature distribution diagrams in the two schemes of Embodiment 2 are the main features of this invention.

[0024] The diagram shows: 1. Metal disc; 2. Inner diameter metal ring of the coil; 3. Outer diameter metal ring of the coil. Detailed Implementation

[0025] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0026] Example 1 like Figure 1 As shown, a multi-coil high-temperature superconducting magnet frame with a material gradient distribution according to the present invention includes a metal disk 1, an inner diameter metal ring 2, and an outer diameter metal ring 3. The metal disk 1 is installed between the inner diameter metal ring 2 and the outer diameter metal ring 3, and multiple metal disks 1 are axially spaced between the inner diameter metal ring 2 and the outer diameter metal ring 3. The mechanical strength of the multiple metal disks 1 increases from both ends to the middle along the axial direction of the magnet frame, and the mechanical strength of the outer diameter metal ring 3 is greater than that of the inner diameter metal ring 2. The electrical conductivity of the metal disks 1 is greater than that of the inner diameter metal ring 2 and also greater than that of the outer diameter metal ring 3. The electrical conductivity of the multiple metal disks 1 increases from both ends to the middle along the axial direction of the magnet frame.

[0027] The basic function of a superconducting magnet skeleton is to provide effective mechanical support for the magnet. Using metal materials to make the skeleton can bring additional advantages, namely, the metal skeleton can transfer some energy to accelerate the discharge process during the magnet discharge process.

[0028] The mechanical support provided by the framework is determined by the mechanical strength of the metal material used. A material with appropriate mechanical strength can be selected based on the magnitude of the force experienced at different locations on the magnet. The electromagnetic force of the magnet is the primary consideration. The electromagnetic force experienced by a superconducting magnet is determined by both the current and the magnetic field. The electromagnetic force density at each location can be expressed using the Lorentz force calculation formula:

[0029] For insulated superconducting coils, each strip carries the same current, so the electromagnetic force mainly depends on the distribution of the magnetic field. For example... Figure 2The diagram shows the magnetic field distribution of a multi-coil magnet composed of 18 double-coil coils: the radial magnetic field distribution determines the axial electromagnetic force distribution, and the axial magnetic field distribution determines the radial electromagnetic force distribution. Taking any metal disk 1 along the axial direction for force analysis, the required support force is equal to the superposition of the electromagnetic forces experienced by the multiple coils above it, with the magnitude gradually increasing from both ends to the middle of the magnet. Along the radial direction, the entire magnet is mainly subjected to forces in the positive radial direction; therefore, the outer diameter metal ring 3 of the coils requires a greater force. Based on the above discussion, the following design should be adopted in terms of mechanical strength: along the axial direction, the mechanical strength of the metal disk 1 increases from both ends to the middle; along the radial direction, the mechanical strength of the outer diameter metal ring 3 of the coils should be greater than that of the inner diameter metal ring 2 of the coils.

[0030] The ability of the coil frame to accelerate magnet discharge is related to the conductivity of the metal material used. Using copper coil frames with different residual resistivity, the discharge current of the coil is as follows: Figure 3 As shown. Therefore, the higher the conductivity of the metal frame (the higher the residual resistivity, the purer the copper, the higher the conductivity), the better the effect of accelerating discharge, and the more energy can be transferred from the magnet. During the process of accelerating coil discharge with the metal frame, the eddy currents in the metal frame generate heat, causing a temperature rise, which lowers the critical current of the coil, allowing more current to penetrate.

[0031] like Figure 4 As shown, along the magnet's axial direction, more current flows through the coils at the top and bottom ends of the magnet; along the magnet's radial direction, more current flows through the coil turns at the inner and outer diameters of the magnet. Therefore, the coils at the top and bottom ends of the magnet and the coil turns at the inner and outer diameters of the magnet are more prone to overcurrent, representing the magnet's "danger zones." Therefore, when designing the frame, it is desirable to concentrate the energy transferred from the frame in the middle of the magnet to achieve a gradient temperature distribution and reduce the risk of overcurrent in the magnet's "danger zones." Based on simulation results, as... Figure 5 As shown, the metal ring plays a minimal role in accelerating the discharge; the primary consideration is transferring energy from the magnet through the metal disk 1. Therefore, the metal ring is made of a low-conductivity material, while the metal disk 1 is made of a high-conductivity material. Based on the design requirements for the magnet's temperature distribution, the conductivity of the metal disk 1 should increase from both ends to the middle along the magnet's axis.

[0032] Stainless steel (SS 304L), aluminum alloy (Al 6061-T6), brass, and silver are the four main industrial materials used in this invention. Their mechanical strength, in descending order, is stainless steel > brass > aluminum alloy > silver. Their electrical conductivity, in descending order, is silver > aluminum alloy > brass > stainless steel. Based on the above discussion, metal disk 1 will be constructed by stacking stainless steel, brass, and silver. The higher the proportion of stainless steel, the higher the mechanical strength of metal disk 1; the higher the proportion of silver, the higher the electrical conductivity of metal disk 1. Therefore, the mechanical strength requirements can be met by adjusting the proportion of stainless steel, and the electrical conductivity requirements can be met by adjusting the proportion of silver. Specifically, metal disk 1 is composed of stainless steel, brass, and silver stacked along the axial direction of the magnet frame. A higher proportion of stainless steel in metal disk 1 results in higher mechanical strength, while a higher proportion of silver results in higher electrical conductivity. Metal disk 1 is constructed from bottom to top along the axial direction of the magnet frame, consisting of layers of stainless steel, brass, silver, brass, and stainless steel. The thickness of the silver layer is equal to the thickness of a single stainless steel layer, and the ratio of the silver layer thickness to the thickness of metal disk 1 is [value missing]. k Multiple metal disks 1 have the same thickness, but the material thickness of metal disks 1 at different locations is... k satisfy: The metal disk 1 is numbered 1 to 1 along the axial direction of the magnet frame from top to middle. n +1, no. i The material thickness ratio of the metal disk 1 is: k Designed as follows: .

[0033] The outer diameter metal ring 3 of the coil is made of stainless steel. The inner diameter metal ring 2 of the coil is made of aluminum alloy. Both the outer surface of the inner diameter metal ring 2 and the inner surface of the outer diameter metal ring 3 of the coil have slots, and the metal disk 1 is embedded in the slots on the outer surface of the inner diameter metal ring 2 and the inner surface of the outer diameter metal ring 3 of the coil.

[0034] According to the present invention, a design method for a multi-coil high-temperature superconducting magnet skeleton with material gradient distribution is provided, the method comprising the following steps: The dimensions of the inner diameter metal ring 2 and the outer diameter metal ring 3 of the coil were designed according to the design requirements. The metal rings mainly provide mechanical support. The outer diameter metal ring 3, due to its higher radial electromagnetic force, is made of stainless steel with high mechanical strength. The inner diameter metal ring 2 is made of cost-effective aluminum alloy.

[0035] The multi-layer stacked design of metal disk 1 was completed. To ensure that metal disk 1 possesses both high mechanical strength and accelerated discharge capability, brass disks, stainless steel disks, and silver disks were stacked to form metal disk 1, as shown in the diagram. Figure 6As shown, the silver disk and the single-layer stainless steel disk have the same thickness, and their respective proportions to the total thickness of the metal disk 1 are [percentage missing]. k .

[0036] The material gradient distribution design for multiple metal disks 1 was completed. To ensure effective support of the magnet by the metal frame while reducing the temperature rise at the magnet's ends, the thickness of each metal disk 1 was kept constant. The material thickness ratio of the metal disks 1 at different locations was adjusted. k Considering the symmetry of the magnet design, only the material design of the upper skeleton is described. The metal disks 1 are numbered from top to middle as 1 to... n +1, no. i The material thickness of the metal disc 1 is greater than k Designed as follows: .

[0037] In designing the material gradient distribution of multiple metal disks 1, the thickness of each metal disk 1 remains the same. The material thickness ratio of the metal disks 1 at different locations is adjusted according to design requirements. k .

[0038] The metal skeleton of the multi-coil high-temperature superconducting system is designed according to the above method. The material thickness ratio of the metal disk 1 exhibits a gradient distribution along the magnet axis, which is the material gradient distribution skeleton design structure proposed in this application.

[0039] Processing and molding steps: Based on the above design steps, the metal frame is designed according to the dimensional parameters of the superconducting coil. The metal frame is then fabricated and assembled, following these steps: According to the design requirements, metal disk 1 and metal ring of the corresponding size were prepared, and the oxide layer of each metal material used to prepare the metal skeleton was removed by cleaning.

[0040] Install a metal ring 2 to fix the inner diameter of the coil. This metal ring has a slot cut at the position corresponding to the metal disk 1, such as... Figure 7 As shown.

[0041] Based on the design structure, metal discs 1 of different materials are stacked to form an integral metal disc 1 at each position, and then inserted into the corresponding slot position.

[0042] Superconducting coils are wound on a skeleton.

[0043] Install and secure the outer diameter metal ring 3 of the coil.

[0044] It should be noted that the use of stainless steel, brass, silver, aluminum alloy and other metal materials as examples in the embodiments of this application is for the purpose of facilitating the understanding of the technical solution of this application. Other materials that meet the requirements of mechanical strength and electrical conductivity in the prior art can also be applied to the technical solution of this application.

[0045] Example 2 Based on Embodiment 1, this invention provides a multi-coil high-temperature superconducting magnet framework with a material gradient distribution. A detailed description is given below using a magnet framework design consisting of 18 double-coil coils as an example: the inner diameter metal ring 2 of the coils is made of aluminum alloy, and the outer diameter metal ring 3 of the coils is made of stainless steel. The metal disk 1 is made of stainless steel, brass, and silver stacked together. The material distribution of the metal disk 1 at different positions in the magnet is as follows... Figure 8 As shown.

[0046] The discharge behavior of the superconducting magnet was compared when using the material gradient distribution framework design proposed in this application and employing brass as the framework. For example... Figure 9 As shown, when using the material gradient distribution frame design proposed in this application, the coil can discharge rapidly in the initial stage of discharge, which is superior to using a brass frame. This is because the silver layer, with its high conductivity, can transfer more energy, but it also generates a higher temperature rise. Figure 10 As shown, the proposed skeleton design results in a higher magnet temperature rise at the end of the discharge. However, due to the gradient material distribution design, the temperature rise is concentrated in the middle of the magnet where current penetration is less, reducing the risk of quench burnout of the coils at both ends of the magnet. In summary, the proposed gradient material distribution magnet skeleton design, compared to a brass skeleton, can accelerate the discharge speed in the initial stage of magnet discharge and achieve a temperature gradient distribution, reducing the risk of quench burnout during magnet discharge and improving the stability and safety of magnet operation.

[0047] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0048] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A multi-coil high-temperature superconducting magnet framework with a material gradient distribution, characterized in that, It includes a metal disk (1), a coil inner diameter metal ring (2) and a coil outer diameter metal ring (3). The metal disk (1) is installed between the coil inner diameter metal ring (2) and the coil outer diameter metal ring (3), and multiple metal disks (1) are axially spaced between the coil inner diameter metal ring (2) and the coil outer diameter metal ring (3). The mechanical strength of the multiple metal discs (1) increases from both ends to the middle along the axial direction of the magnet frame, and the mechanical strength of the outer diameter metal ring (3) of the coil is greater than that of the inner diameter metal ring (2) of the coil. The conductivity of the metal disk (1) is greater than that of the inner diameter metal ring (2) of the coil, and also greater than that of the outer diameter metal ring (3) of the coil. The conductivity of the plurality of metal disks (1) increases from both ends to the middle along the axial direction of the magnet frame.

2. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 1, characterized in that, The metal disk (1) is made of stainless steel, brass and silver stacked along the axis of the magnet frame; The higher the proportion of stainless steel in the metal disk (1), the higher the mechanical strength of the metal disk (1); the higher the proportion of silver, the higher the electrical conductivity of the metal disk (1).

3. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 2, characterized in that, The metal disk (1) is composed of stainless steel layer, brass layer, silver layer, brass layer and stainless steel layer stacked from bottom to top along the axis of the magnet skeleton.

4. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 3, characterized in that, The thickness of the silver layer is equal to the thickness of a single stainless steel layer, and the ratio of the thickness of the silver layer to the thickness of the metal disk (1) is [value missing]. k .

5. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 4, characterized in that, Multiple metal disks (1) have the same thickness, and the material thickness of metal disks (1) at different positions is... k satisfy: The metal disks (1) are numbered 1 to 1 along the axial direction of the magnet frame from the top to the middle. n +1, no. i The material thickness ratio of the metal disks (1) is: k Designed as follows: 。 6. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 1, characterized in that, The outer diameter metal ring (3) of the coil is made of stainless steel.

7. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 1, characterized in that, The inner diameter metal ring (2) of the coil is made of aluminum alloy.

8. The multi-coil high-temperature superconducting magnet framework with material gradient distribution as described in claim 1, characterized in that, The outer surface of the inner diameter metal ring (2) of the coil and the inner surface of the outer diameter metal ring (3) of the coil are both provided with slots, and the metal disk (1) is embedded in the slots on the outer surface of the inner diameter metal ring (2) of the coil and the inner surface of the outer diameter metal ring (3) of the coil.

9. A method for designing a multi-coil high-temperature superconducting magnet framework with a material gradient distribution, characterized in that, The method for forming a multi-coil high-temperature superconducting magnet framework with a material gradient distribution as described in any one of claims 1 to 8 comprises the following steps: Complete the dimensional design of the inner diameter metal ring (2) and the outer diameter metal ring (3) of the coil according to the design requirements; Complete the multi-layer stacking design of the metal disk (1); Complete the material gradient distribution design for multiple metal disks (1).

10. The design method for a multi-coil high-temperature superconducting magnet skeleton with material gradient distribution as described in claim 9, characterized in that, In designing the material gradient distribution of multiple metal disks (1), the thickness of each metal disk (1) remains the same. According to the design requirements, the material thickness ratio of the metal disks (1) at different locations is adjusted. k .

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