Joint connecting structure of superconducting cable for star simulator superconducting magnet

Abstract

The invention discloses a connector connecting structure of a superconducting cable for a star simulator superconducting magnet, and relates to the technical field of superconducting cable connector connection, and the connector connecting structure comprises a clamp system which is used for clamping the connecting end of the superconducting cable and is provided with a first clamping plate and a second clamping plate. A plurality of fixing structures are arranged between the first clamping plate and the second clamping plate, the fixing structures are at least used for connecting the first clamping plate and the second clamping plate together and fixing the current distance between the first clamping plate and the second clamping plate, and first fixing rods are arranged in the fixing structures. As long as it is guaranteed that the first clamping plate and the second clamping plate can stably abut against the outer portion of the connecting end of the superconducting cable and extrusion force is continuously provided, the problem of virtual connection or poor contact between the clamp system and the connecting end of the superconducting cable at the low temperature can be avoided, the contact resistance between the clamp system and the connecting end can be reduced, and the problem that the heating value of the connecting position is large is avoided.

Description

Technical Field

[0001] This invention relates to the field of superconducting cable connector technology, specifically to a connector connection structure for a superconducting cable used in a stellarator superconducting magnet. Background Technology

[0002] Stellarator superconducting cables are key current-carrying components for confining high-temperature plasmas. They are typically made of stranded superconducting cable wires, sheathed in a stainless steel tube, and cooled to below the critical temperature by passing liquid nitrogen, liquid helium, or cold helium gas. This allows for stable transmission of large currents under strong magnetic fields and ultra-low temperatures.

[0003] The stellarator superconducting cable has a large outer diameter and shrinks at low temperatures, resulting in significant deformation. For superconducting cables of the same size, the outer armor or sheath needs to be removed before connecting the electrodes. A protective conductive sleeve is then welded onto the outside, and the end with the conductive sleeve is pressed between two clamps for fixation. To ensure a tight connection between the conductive sleeve and the clamps, an indium sheet or flexible conductive material is usually laid between the conductive sleeve and the clamps to further improve the tightness of the connection and avoid increased resistance at the connection end due to poor connection. However, since superconducting cables and connectors need to be used in low-temperature environments, such as 4.2 Kelvin or below 77K, the structure will shrink due to cold. Gaps may form between the conductive sleeve and the clamp. Furthermore, because superconducting cable connectors of the same size may have different thicknesses of removed armor and different tolerances of the external conductive sleeve, even for superconducting cable connectors of the same size, after being connected to the matching press clamp, the content of the indium sheet or flexible conductive material may be insufficient at low temperatures, resulting in poor contact, increased resistance, and excessive heat generation at the connector. Summary of the Invention

[0004] The present invention aims to solve the problem that the existing connector structure of superconducting cables cannot adapt to the poor contact between the connector and the superconducting cable at low temperatures caused by different thicknesses of the removed armor and different tolerances of the conductive sleeve.

[0005] To address the aforementioned problems, this invention provides a connector structure for a superconducting cable used in a stellarator superconducting magnet, comprising a clamping system for clamping the connector end of the superconducting cable. The clamping system has a first clamping plate and a second clamping plate, and a plurality of fixing structures are provided between the first clamping plate and the second clamping plate. The plurality of fixing structures are at least used to connect the first clamping plate and the second clamping plate together and fix the current distance between the first clamping plate and the second clamping plate. The fixing structure has a first fixing rod, the coefficient of linear expansion of the first fixing rod being larger than that of the connector end of the superconducting cable, and the first clamping plate is made of a conductive material.

[0006] The present invention provides a connector structure for a superconducting cable used in a stellarator superconducting magnet, which, compared with the prior art, has the following beneficial effects, but is not limited to: As long as the first and second clamps can stably abut against the outside of the connection end of the superconducting cable and continuously provide compressive force, the problem of poor connection or contact between the clamping system and the connection end of the superconducting cable at low temperature can be avoided, the contact resistance between the two can be reduced, and the problem of excessive heat generation at the connection point can be avoided.

[0007] As a further aspect of the present invention, the material used to manufacture the first fixing rod includes at least one or more of aluminum, polyimide, iron-nickel alloy and polyetheretherketone.

[0008] As a further aspect of the present invention: the fixing structure includes one or two second fixing rods, the second fixing rods being used to connect with the first clamping plate / second clamping plate, and one end of the second fixing rod being connected to the first fixing rod.

[0009] As a further aspect of the present invention, the first fixing rod and the second fixing rod are detachably connected.

[0010] As a further aspect of the present invention: the fixing structure includes a balance bar assembly and a second fixing bar, the balance bar assembly, the second fixing bar and the first fixing bar are axially connected accordingly, the balance bar assembly is connected to an external fluid pipeline, the fluid pipeline is equipped with a solenoid valve, and the other end of the fluid pipeline is connected to a container containing fluid through a corresponding fluid pump.

[0011] As a further aspect of the present invention: the balance bar assembly is provided with a chamber, the chamber is connected to a corresponding fluid pipe, an inner rod is slidably arranged in the chamber, and one end of the inner rod is connected to the corresponding second fixed rod / first fixed rod.

[0012] As a further aspect of the present invention, the balance bar assembly, the second fixing bar, and the first fixing bar are all detachably connected.

[0013] As a further aspect of the present invention: the first clamping plate and the second clamping plate are made of at least copper material.

[0014] As a further aspect of the present invention: a positioning portion extending along the length direction is formed in the middle of the first clamping plate and the second clamping plate, and a recess is formed in the middle of the positioning portion.

[0015] As a further aspect of the present invention, the shape of the connecting end of the superconducting cable is one of a circle, a square, and a spiral. Attached Figure Description

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention at low temperature; Figure 3 This is an enlarged schematic diagram of the fixed structure in one embodiment of the present invention; Figure 4 This is an enlarged schematic diagram of the fixed structure in another embodiment of the present invention.

[0018] In the figure: 1. Clamping system; 11. First clamping plate; 12. Second clamping plate; 2. Connecting end; 3. Fixing structure; 31. First fixing rod; 32. Second fixing rod; 33. Balance bar assembly; 34. Fluid pipeline; 4. Positioning part. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the specification, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", 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 invention 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 invention.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0024] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0025] like Figure 1-3 As shown, a connector structure for a superconducting cable used in a stellarator superconducting magnet includes a clamping system 1 for clamping the connector end 2 of the superconducting cable. The clamping system 1 has a first clamping plate 11 and a second clamping plate 12. A plurality of fixing structures 3 are provided between the first clamping plate 11 and the second clamping plate 12. The plurality of fixing structures 3 are at least used to connect the first clamping plate 11 and the second clamping plate 12 together and fix the current spacing between the first clamping plate 11 and the second clamping plate 12. The fixing structure 3 has a first fixing rod 31. The coefficient of linear expansion of the first fixing rod 31 is greater than that of the connector end 2 of the superconducting cable. The first clamping plate 11 is made of conductive material.

[0026] In this embodiment, the clamping system 1, by providing a first clamping plate 11 and a second clamping plate 12, can achieve alignment and clamping of both sides of the superconducting cable's connecting end 2, confining the connecting end 2 of the superconducting cable within it. This clamping method has an advantage: the first clamping plate 11 and the second clamping plate 12 do not come into contact, thus leaving space for subsequent deformation of the first clamping plate 11 and the second clamping plate 12 under the action of the fixing structure 3. The fixing structure 3 is used to fix the first clamping plate 11 and the second clamping plate 12 at a distance that precisely clamps the connecting end 2 of the superconducting cable, making it difficult for the connecting end 2 of the superconducting cable to move within the clamping system 1, at least at room temperature. The first fixing rod 31... The fact that the linear expansion coefficient is larger than that of the superconducting cable connector 2 means that the material used to make the first fixing rod 31 has a larger linear expansion coefficient than the material used to make the superconducting cable connector 2 under the same external conditions. It can be understood that the larger the linear expansion coefficient, the greater the length change of the material or structure for the same temperature change. Therefore, maximizing the linear expansion coefficient of the first fixing rod 31 ensures that when the clamping system 1, the fixing structure 3, and the superconducting cable are placed in a low-temperature environment, the deformation of the first fixing rod 31 is maximized, causing the first clamping plate 11 and the second clamping plate 12 to bend closer together. When the first clamping plate 11 and the second clamping plate 12 bend, ( Figure 2 This is a schematic diagram of deformation and does not represent the actual deformation of the first clamp 11 and the second clamp 12 or serve as any reference for calculating their deformation. It will further reduce the distance between them. Therefore, even if the connection end 2 of the superconducting cable also shrinks under the same conditions, its deformation is less than the deformation caused by the first fixing rod 31 to change the distance between the first clamp 11 and the second clamp 12. Therefore, the first clamp 11 and the second clamp 12 can still stably abut against the outside of the connection end 2 of the superconducting cable and continuously provide compressive force. The first clamp 11 is made of conductive material and is used to transmit current to the electrode side through the conductive first clamp 11 when the clamp system 1 is connected to the electrode.

[0027] As long as the first clamping plate 11 and the second clamping plate 12 can stably abut against the outside of the connection end 2 of the superconducting cable and continuously provide compressive force, the problem of poor connection or contact between the clamping system 1 and the connection end 2 of the superconducting cable at low temperature can be avoided. This can reduce the contact resistance between the two and avoid the problem of excessive heat generation at the connection. Even when the structure is moved from a low temperature environment to a normal temperature environment, the first fixing rod 31 can also cause the first clamping plate 11 and the second clamping plate 12 to deform in opposite directions by increasing its length. This balances the clamping force of the first clamping plate 11 and the second clamping plate 12 on the superconducting cable at this time, and avoids the problem of over-clamping the superconducting cable when it is transferred to a normal temperature environment, which may cause damage to the superconducting cable. In addition, the present invention can also be applied to the clamping and fixing operation of the connection end 2 of superconducting cables with different outer diameters within a certain range, reducing the number of types of joints.

[0028] In one possible implementation, the coefficient of linear expansion of the first fixing rod 31 can be no less than 14 × 10⁻⁶. -6 / ℃.

[0029] It is understood that the fixing structure 3 may only include the first fixing rod 31, wherein threaded holes are provided on the first clamping plate 11 and the second clamping plate 12. For example, one end of the first fixing rod 31 passes through the threaded hole on the first clamping plate 11 and is threadedly connected to the second clamping plate 12. The inner diameter of the threaded hole on the first clamping plate 11 is smaller than that on the threaded hole on the second clamping plate 12, but matches the thread on the first fixing rod 31. The fixing structure 3 may also include the first fixing rod 31 and a nut for limiting the first fixing rod 31 at one end. For example, through holes are provided on the first clamping plate 11 and the second clamping plate 12. The inner diameter of the through holes is larger than the outer diameter of the first fixing rod 31 and smaller than the outer diameter of the nut. The first fixing rod 31 completely passes through the first clamping plate 11 and the second clamping plate 12. One end / both ends of the first fixing rod 31 are threadedly connected to the outside of the first fixing rod 31 by a nut.

[0030] It is understandable that since the clamping system 1 and the fixing structure 3 need to be placed in a low-temperature environment after being fixed to the connection end 2 of the superconducting cable, in order to avoid the materials used to make the clamping system 1 and the fixing structure 3 becoming brittle and cracking at low temperatures, if the lowest ambient temperature in the application scenario is 'a', then the ductile-brittle transition temperature of the materials used to make the clamping system 1 and the fixing structure 3 should be at least lower than 'a', so as to avoid the problem of brittle fracture of the clamping system 1 and the fixing structure 3 at low temperatures.

[0031] Optionally, the material used to make the first fixing rod 31 includes at least one or more of aluminum, polyimide, iron-nickel alloy and polyetheretherketone.

[0032] In this embodiment, in order to maximize the linear expansion coefficient of the first fixing rod 31, the material used to manufacture it may include one or more of aluminum, polyimide, iron-nickel alloy and polyetheretherketone. When these materials are molded individually or in combination with each other in the manufacturing process of the first fixing rod 31, the resulting first fixing rod 31 exhibits better toughness in low-temperature environments.

[0033] Optionally, the fixing structure 3 includes one or two second fixing rods 32, which are used to connect with the first clamping plate 11 / second clamping plate 12, and one end of the second fixing rod 32 is connected to the first fixing rod 31.

[0034] In this embodiment, the number of second fixing rods 32 can be one. If the number of second fixing rods 32 is one, for example: one end of the second fixing rod 32 is connected to the first clamping plate 11, one end of the second fixing rod 32 is connected to the first fixing rod 31, and the other end of the first fixing rod 31 is connected to the second clamping plate 12. The number of second fixing rods 32 can also be two, wherein one end of the two second fixing rods 32 is connected to the corresponding first clamping plate 11 / second clamping plate 12 respectively, and the other end of both is connected to the first fixing rod 31. The first fixing rod 31 is located between the two second fixing rods 32. The two second fixing rods 32 and the first fixing rod 31 constitute a fixing structure 3. Since the length of the first fixing rod 31 can be adjusted in this structure, the actual length of the first fixing rod 31 can be changed as needed, thereby adjusting its actual deformation at low temperature, and thus controlling the pressure value formed by the first clamping plate 11 and the second clamping plate 12 on the connection end 2 of the superconducting cable when bending.

[0035] like Figure 3 As shown, optionally, the first fixing rod 31 and the second fixing rod 32 are detachably connected.

[0036] In this embodiment, a detachable connection is formed between the first fixing rod 31 and the second fixing rod 32. For example, a threaded protrusion is machined at one end of the first fixing rod 31, and a corresponding threaded groove is machined at the corresponding end of the second fixing rod 32, so that the first fixing rod 31 and the second fixing rod 32 are threadedly connected. This allows for easy selection or machining of a suitable first fixing rod 31 according to the actual length of the first fixing rod 31 used, and the connection is made through this simple and standard detachable joint, which facilitates the assembly operation between structures.

[0037] like Figure 4 As shown, optionally, the fixing structure 3 includes a balance bar group 33 and a second fixing bar 32. The balance bar group 33, the second fixing bar 32 and the first fixing bar 31 are axially connected. The balance bar group 33 is connected to an external fluid pipe 34. The fluid pipe 34 is equipped with a solenoid valve. The other end of the fluid pipe 34 is connected to a container containing fluid through a corresponding fluid pump.

[0038] In this embodiment, the fixing structure 3 also includes a balance bar assembly 33. The balance bar assembly 33, the second fixing rod 32, and the first fixing rod 31 are axially connected. For example, one end of the balance bar assembly 33 is connected to one end of the second fixing rod 32, and the other end of the second fixing rod 32 is connected to one end of the first fixing rod 31. Axial connection means that the structures are connected in a collinear or parallel manner with their central axes. The balance bar assembly 33 is connected to an external fluid pipe 34. The fluid pressure in the balance bar assembly 33 is adjusted by a solenoid valve in conjunction with a fluid pump, so that one end of the balance bar assembly 33 extends or retracts, making the overall length of the balance bar assembly 33 adjustable. It can be understood that since the first fixing rod 31 has the largest coefficient of linear expansion, its length will change at low temperatures. The greater the change in length, the greater the bending degree of the first clamping plate 11 and the second clamping plate 12. Therefore, the squeezing force of the first clamping plate 11 and the second clamping plate 12 on the connection end 2 of the superconducting cable will be greater. And since the connection end 2 of the superconducting cable is provided with a superconducting... The superconducting material has an upper limit threshold for the external compressive force it can withstand. If this threshold is exceeded, the internal superconducting material may be damaged, causing the superconducting cable to lose its superconductivity. Therefore, by introducing a balance bar group 33 into the fixed structure 3, the actual deformation of the first fixed bar 31 and the magnitude of the compressive force generated at the connection end 2 of the superconducting cable in the actual low-temperature environment are analyzed by detecting the pressure value at the end of the balance bar group 33. The end of the balance bar group 33 extends a certain distance to balance the compressive force and prevent it from reaching the upper limit threshold that could damage the superconducting cable. After introducing this structure, the adjustability and stability of this connector connection structure are better during use. Moreover, after the structure is transferred from the low-temperature environment to the normal temperature environment, the end of the balance bar group 33 can also extend to reduce the bending deformation of the first clamping plate 11 and the second clamping plate 12, preventing the first clamping plate 11 and the second clamping plate 12 from maintaining the same amount of bending after being transferred from the low-temperature environment to the normal temperature environment, thus avoiding damage to the superconducting cable structure caused by the large compressive force generated by the first clamping plate 11 and the second clamping plate 12.

[0039] It is understood that the fluid introduced into the balance bar assembly 33 from the fluid pipe 34 can be either a liquid or a gas. The liquefaction temperature of the gas cannot be higher than the lowest temperature in the low-temperature environment, and the freezing temperature of the liquid cannot be higher than the lowest temperature in the low-temperature environment. At the same time, all structures used to make the balance bar assembly 33 and the structure of the fluid pipe 34 should meet the requirements of the low-temperature environment, at least to prevent leakage of liquid or gas.

[0040] Optionally, the balance bar assembly 33 has a chamber that is connected to the corresponding fluid pipe 34. An inner rod is slidably disposed in the chamber, and one end of the inner rod is connected to the corresponding second fixed rod 32 / first fixed rod 31.

[0041] In this embodiment, the corresponding fluid is introduced into the chamber through the fluid pipe 34, thereby changing the pressure value in the chamber. This changes the distance by which the inner rod extends out of the balance bar group 33, making it convenient to adjust the squeezing force on the connection end 2 of the superconducting cable at low or normal temperatures.

[0042] like Figure 4 As shown, optionally, the balance bar assembly 33, the second fixed bar 32, and the first fixed bar 31 are all detachably connected.

[0043] In this embodiment, the balance bar assembly 33, the second fixed bar 32, and the first fixed bar 31 can all be detachably connected, which facilitates the selection and replacement of balance bar assemblies 33, the second fixed bar 32, and the first fixed bar 31 of different lengths for installation, and facilitates adjustment and assembly operations.

[0044] Optionally, the first clamping plate 11 and the second clamping plate 12 are made of at least copper.

[0045] In this embodiment, copper is a material with good electrical conductivity and is not prone to brittle fracture in low-temperature environments. Therefore, the first clamping plate 11 and the second clamping plate 12 may include at least copper material. Pure copper is also relatively soft and can be bent under the action of the first fixing rod 31 under cold shrinkage, which facilitates deformation.

[0046] like Figure 1-2 As shown, optionally, a positioning portion 4 extending along the length direction is formed on the upper middle part of the first clamping plate 11 and the second clamping plate 12, and a recess is formed in the middle of the positioning portion 4.

[0047] In this embodiment, a recess is formed in the positioning part 4, which can be used to position the connection end 2 of the superconducting cable to prevent the superconducting cable from sliding between the first clamping plate 11 and the second clamping plate 12, causing unstable position and resulting in a loose connection.

[0048] Optionally, the shape of the superconducting cable connection end 2 is one of circular, square, and spiral.

[0049] In this embodiment, the interface shape of the superconducting cable is different. By providing a recess, it can match superconducting cables with various interface shapes. Moreover, by providing a large space between the first clamping plate 11 and the second clamping plate 12, this connection structure can also facilitate the reliable clamping of the connection ends 2 of superconducting cables with different shapes at room temperature and low temperature.

[0050] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A connector structure for a superconducting cable used in a stellarator superconducting magnet, characterized in that, The device includes a clamping system (1) for clamping the connection end (2) of the superconducting cable. The clamping system (1) has a first clamping plate (11) and a second clamping plate (12). A plurality of fixing structures (3) are provided between the first clamping plate (11) and the second clamping plate (12). The plurality of fixing structures (3) are at least used to connect the first clamping plate (11) and the second clamping plate (12) together and fix the current spacing between the first clamping plate (11) and the second clamping plate (12). The fixing structure (3) has a first fixing rod (31). The coefficient of linear expansion of the first fixing rod (31) is greater than that of the connection end (2) of the superconducting cable. The first clamping plate (11) is made of conductive material.

2. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 1, characterized in that, The materials used to make the first fixing rod (31) include at least one or more of aluminum, polyimide, iron-nickel alloy and polyetheretherketone.

3. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 1, characterized in that, The fixing structure (3) includes one or two second fixing rods (32), which are used to connect with the first clamping plate (11) / second clamping plate (12), and one end of the second fixing rod (32) is connected to the first fixing rod (31).

4. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 3, characterized in that, The first fixing rod (31) and the second fixing rod (32) are detachably connected.

5. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 1, characterized in that, The fixed structure (3) includes a balance bar group (33) and a second fixed bar (32). The balance bar group (33), the second fixed bar (32) and the first fixed bar (31) are axially connected. The balance bar group (33) is connected to an external fluid pipe (34). The fluid pipe (34) is equipped with a solenoid valve. The other end of the fluid pipe (34) is connected to a container containing fluid through a corresponding fluid pump.

6. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 5, characterized in that, The balance bar assembly (33) has a chamber that is connected to the corresponding fluid pipe (34). An inner rod is slidably installed in the chamber, and one end of the inner rod is connected to the corresponding second fixed rod (32) / first fixed rod (31).

7. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 5, characterized in that, The balance bar assembly (33), the second fixed bar (32), and the first fixed bar (31) are all detachably connected.

8. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 1, characterized in that, The first clamping plate (11) and the second clamping plate (12) are made of at least copper.

9. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 1, characterized in that, The first clamping plate (11) and the second clamping plate (12) have a positioning part (4) extending along the length direction at the upper middle part, and a recess is formed in the middle of the positioning part (4).

10. The connector structure for a superconducting cable used in a stellarator superconducting magnet according to claim 1, characterized in that, The shape of the connection end (2) of the superconducting cable is one of the following: circular, square, and spiral.

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