Superconducting joint and superconducting cable assembly for a stellarator

Abstract

The application discloses a superconducting joint and a superconducting cable assembly for a stellarator, wherein the superconducting joint comprises a support seat, a joint guide seat and a clamping assembly which are sequentially and fixedly connected along the length direction of the superconducting joint. Along the extension direction perpendicular to the length direction, the support seat is provided with a first boss and a second boss which are spaced apart, and each of the first boss and the second boss is provided with a through hole; the joint guide seat is provided with a first guide hole and a second guide hole which are spaced apart; and the clamping assembly comprises a first sleeve and a second sleeve which are spaced apart along the extension direction. When the first superconducting cable and the second superconducting cable are electrically connected, the first cable connecting part and the second superconducting cable connecting part are jointly limited by the support seat, the guide seat and the clamping assembly, thereby reducing the risk of displacement, hinging and disconnection of the connecting position of the first superconducting cable and the second superconducting cable, and enabling the first superconducting cable and the second superconducting cable to stably conduct current.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of superconductivity, and in particular to a superconducting joint for a stellarator and a superconducting cable assembly. BACKGROUND

[0002] A stellarator is a toroidal magnetic confinement device designed to achieve controlled nuclear fusion, and is parallel to the tokamak as the two core directions of magnetic confinement fusion research. Its core design concept is to confine high-temperature plasma through a helical magnetic field. This magnetic field is generated by a set of carefully arranged external coils, the twisted shape of the coils simulates the trajectory of the plasma in the toroidal vacuum chamber, and does not rely on the magnetic field generated by the plasma current itself like the tokamak, so it has better stability in principle and is more suitable for the continuous power generation needs of future fusion power plants. Although its structural complexity and construction cost are higher, in the long-term exploration of controlled nuclear fusion, the stellarator is considered as one of the most promising technical paths, providing important support for mankind to ultimately achieve clean and unlimited fusion energy.

[0003] The stellarator generally uses a twisted superconducting magnet to achieve the required complex magnetic cage. The stellarator superconducting magnet has a large current and a high magnetic field, and generally uses an armored method to improve the structural strength of the conductor. Limited by the winding length or winding process difficulty of a single conductor, a single superconducting magnet usually has multiple pancake coils connected by superconducting joints. The superconducting joint needs to have very low resistance to reduce Joule heat as much as possible, and the key to the design of the superconducting joint is to quickly remove the heat at the joint position through a reasonable low-temperature design.

[0004] Generally, a superconducting conductor joint can electrically connect two pancake coils, but in the prior art, when connecting two pancake coils, after the superconducting cable joints of the two pancake coils are electrically connected to each other, the input end positions of the superconducting cable joints of the two pancake coils are free, and in the process of use, when subjected to an external magnetic field, the two pancake coils will shake due to electromagnetic force, and in the process of long-term use, there is a risk that the connection positions of the two pancake coils will be offset, hinged, and disconnected, thereby causing electrical leakage or the stellarator to be unable to work. SUMMARY

[0005] The present application aims to solve the problem in the prior art that in the process of long-term use of the stellarator, the two pancake coils shake for a long time due to the electromagnetic force of the external magnetic field, and in the process of long-term use, there is a risk that the connection positions of the two pancake coils will be offset, hinged, and disconnected, thereby causing electrical leakage or the stellarator to be unable to work.

[0006] To solve the above problems, the application provides a superconducting joint for a star simulator, which comprises a support seat, a joint guide seat and a clamping assembly fixedly connected in sequence along the length direction of the superconducting joint.

[0007] The support seat is provided with a first boss and a second boss at intervals along the extension direction perpendicular to the length direction, and each of the first boss and the second boss is provided with a through hole penetrating the boss along the length direction of the superconducting joint; the joint guide seat is provided with a first guide hole and a second guide hole at intervals, and the first guide hole and the second guide hole both penetrate the joint guide seat along the length direction of the superconducting joint; the clamping assembly comprises a first sleeve and a second sleeve provided at intervals along the extension direction, and in the length direction of the superconducting joint, one end of the first sleeve and one end of the second sleeve are both fixedly connected to the end of the joint guide seat away from the support seat, and the first sleeve and the second sleeve are electrically connected.

[0008] When the first superconducting cable and the second superconducting cable in the star simulator are electrically connected through the superconducting joint, the first cable connecting part of the first superconducting cable extends out of the first armor, passes through the through hole of the first boss and the first guide hole in sequence, and extends into the inner cavity of the first sleeve to be electrically connected with the first sleeve; the second cable connecting part of the second superconducting cable extends out of the second armor, passes through the through hole of the second boss and the second guide hole in sequence, and extends into the inner cavity of the second sleeve to be electrically connected with the second sleeve, so that the first cable connecting part is electrically connected with the second cable connecting part through the first sleeve and the second sleeve in sequence, and the end face of the first boss away from the joint guide seat abuts against the end face of the first armor, and the end face of the second boss away from the joint guide seat abuts against the end face of the second armor.

[0009] Adopting the technical scheme, when the superconducting joint electrically connects the first superconducting cable and the second superconducting cable, the first cable connecting part and the second cable connecting part are preliminarily fixed by the first boss and the second boss on the support seat, the first cable connecting part is limited and guided by the first guide hole, and the second cable connecting part is limited and guided by the second guide hole, so that the first cable connecting part and the second cable connecting part are secondarily constrained, and then the first cable connecting part and the second cable connecting part are positionally constrained again by the nested electric connection between the sleeve inner cavities of the first sleeve and the second sleeve and the cable connecting part. Therefore, when the superconducting joint electrically connects the first superconducting cable and the second superconducting cable, the first cable connecting part and the second superconducting cable connecting part are limited by the support seat, the guide seat and the clamping assembly together, so that the first cable connecting part and the second cable connecting part are reliably fixed, even in the process that the first superconducting cable and the second superconducting cable frequently shake, the connection position between the first cable connecting part and the second cable connecting part can be ensured to be stable, the risk that the connection position of the first superconducting cable and the second superconducting cable deviates, articulates and disconnects is reduced, the first superconducting cable and the second superconducting cable can stably conduct current, and the safety and reliability of the stellarator are ensured.

[0010] Further, the embodiment of the present application further discloses a superconducting joint for a stellarator, in the length direction, the through hole of the first boss is opposite to one end of the first guide hole, one end of the first sleeve is opposite to the other end of the first guide hole, the through hole of the second boss is opposite to one end of the second guide hole, and one end of the second sleeve is opposite to the other end of the second guide hole.

[0011] Adopting the technical scheme, the through hole of the first boss is opposite to one end of the first guide hole, and the through hole of the second boss is opposite to one end of the second guide hole, so that when the first cable connecting part passes through the through hole on the first boss and the first guide hole in sequence and the second cable connecting part passes through the through hole on the second boss and the second guide hole in sequence, the problems of friction or jamming caused by path deviation are avoided, and the first cable connecting part and the second cable connecting part are more convenient to install.

[0012] Further, one end of the first sleeve is opposite to the other end of the first guide hole, and one end of the second sleeve is opposite to the other end of the second guide hole, so that the first cable connecting part can directly enter the inner cavity of the first sleeve after passing through the first guide hole, and the second cable connecting part can directly enter the inner cavity of the second sleeve after passing through the second guide hole, forming a continuous conductive path without bending.

[0013] Further, the embodiment of the present application also discloses a superconducting joint for a star simulator, the superconducting joint further comprises a protective cover arranged along a length direction, and one end of the protective cover is fixedly installed on one side of the support base close to the clamping assembly in the length direction, and the clamping assembly is located in the protective cover.

[0014] By arranging the protective cover extending along the length direction between the support base and the clamping assembly and completely wrapping the clamping assembly inside the protective cover, the spatial isolation of the clamping assembly is formed, the direct contact of the clamping assembly with the external environment is blocked, the direct action of the electromagnetic force on the clamping assembly is reduced, the structural stability of the superconducting joint in a complex electromagnetic environment is improved, and the electrical conduction efficiency between the first cable connecting part and the second cable connecting part is higher.

[0015] Further, the embodiment of the present application also discloses a superconducting joint for a star simulator, the superconducting joint further comprises a protective cover arranged along a length direction, and one end of the protective cover is fixedly installed on one side of the support base close to the clamping assembly in the length direction, and the clamping assembly is located in the protective cover.

[0016] Further, the embodiment of the present application also discloses a superconducting joint for a star simulator, the superconducting joint further comprises a protective cover arranged along a length direction, and one end of the protective cover is fixedly installed on one side of the support base close to the clamping assembly in the length direction, and the clamping assembly is located in the protective cover.

[0017] By arranging the protective cover extending along the length direction between the support base and the clamping assembly and completely wrapping the clamping assembly inside the protective cover, the spatial isolation of the clamping assembly is formed, the direct contact of the clamping assembly with the external environment is blocked, the direct action of the electromagnetic force on the clamping assembly is reduced, the structural stability of the superconducting joint in a complex electromagnetic environment is improved, and the electrical conduction efficiency between the first cable connecting part and the second cable connecting part is higher.

[0018] Further, the embodiment of the present application also discloses a superconducting joint for a star simulator, the superconducting joint further comprises a protective cover arranged along a length direction, and one end of the protective cover is fixedly installed on one side of the support base close to the clamping assembly in the length direction, and the clamping assembly is located in the protective cover.

[0019] And, along the length direction, the connecting boss, the insulating connector and the helium tube are sequentially fixedly connected, and the helium tube is located at the side of the connecting boss away from the protective cover; wherein, the liquid flow channel is communicated with the insulating connector, and the insulating connector is communicated with the helium tube.

[0020] With the above technical scheme, when the superconducting joint is cooled, helium liquid flows from the helium tube into the insulating connector, and then flows into the liquid flow channel via the insulating connector, and then flows into the first inner cooling channel and the second inner cooling channel via the liquid flow channel; the insulating connector, as a non-conductive component, forms electrical isolation between the helium tube and the connecting boss, avoiding the risk of the cooling connecting pipe being electrified.

[0021] Further, the embodiment of the present application also discloses a superconducting joint for a stellarator, the clamping assembly further comprises a first pressing plate and a second pressing plate, the first pressing plate is sleeved on the side of the first sleeve away from the second sleeve, the second pressing plate is sleeved on the side of the second sleeve away from the first sleeve, and the first pressing plate is fixedly connected with the second pressing plate; the side of the cover plate close to the clamping assembly is further formed with an annular boss, the outer wall surface of the annular boss is fixedly attached to the inner wall surface of the protective cover, and the inner wall surface of the annular boss is attached to the outer wall surfaces of the first pressing plate and the second pressing plate.

[0022] Further, the end wall of the annular boss, the protective cover, the first pressing plate, the support seat and the joint guide seat jointly form the first outer cooling channel; the end wall of the annular boss, the protective cover, the second pressing plate, the support seat and the joint guide seat jointly form the second outer cooling channel; wherein, the output end of the first inner cooling channel is communicated with the first outer cooling channel, and the output end of the second inner cooling channel is communicated with the second outer cooling channel.

[0023] With the above technical scheme, when the superconducting joint is cooled, helium liquid flows into the first inner cooling channel and the second inner cooling channel via the liquid flow channel to cool the first cable connecting part and the second cable connecting part, and then the output end of the first inner cooling channel flows the cooling liquid to the first outer cooling channel, and the output end of the second inner cooling channel flows the cooling liquid to the second outer cooling channel, forming a cooling loop with internal and external communication, which can further cool the clamping assembly on the premise of ensuring that the first cable connecting part and the second cable connecting part can be cooled first, so that the whole superconducting joint is in a low-temperature state, and the superconducting joint is more reliable in use, ensuring long-term stable operation of the superconducting joint.

[0024] Further, the embodiment of the present application also discloses a superconducting joint for a stellarator, the clamping assembly further comprises a conductive block extending along the length direction, along the extending direction, the conductive block is pressed between the first sleeve and the second sleeve to electrically connect the first sleeve and the second sleeve, and the conductive block is further pressed between the first pressing plate and the second pressing plate to fixedly connect the first pressing plate and the second pressing plate.

[0025] The first sleeve comprises a first conductive sleeve and a first connecting sleeve, the first connecting sleeve being fixedly sleeved on one side of the first conductive sleeve close to the first pressing plate; the second sleeve comprises a second conductive sleeve and a second connecting sleeve, the second connecting sleeve being fixedly sleeved on one side of the second conductive sleeve close to the second pressing plate, the two sides of the conductive block being respectively provided with grooves corresponding to the first conductive sleeve and the second conductive sleeve, at least part of the first conductive sleeve and the second conductive sleeve being respectively embedded into the corresponding grooves and fixedly welded and electrically connected with the conductive block; and in the length direction of the superconducting joint, one end of the first connecting sleeve and the second connecting sleeve close to the joint guide seat is fixedly connected with the joint guide seat, in the extension direction, the outer wall surface of the first connecting sleeve is attached to the first pressing plate, and the outer wall surface of the second connecting sleeve is attached to the second pressing plate.

[0026] When the first superconducting cable and the second superconducting cable are electrically connected through the superconducting joint, the first cable connecting part is inserted into the first conductive sleeve and fixedly welded with the first conductive sleeve, and the second cable connecting part is inserted into the second conductive sleeve and fixedly welded with the second conductive sleeve.

[0027] By adopting the above technical scheme, the conductive block is pressed between the first sleeve and the second sleeve, the first connecting sleeve is fixedly sleeved on one side of the first conductive sleeve close to the first pressing plate, the second connecting sleeve is fixedly sleeved on one side of the second conductive sleeve close to the second pressing plate, the two sides of the conductive block are respectively provided with grooves corresponding to the first conductive sleeve and the second conductive sleeve, at least part of the first conductive sleeve and the second conductive sleeve are respectively embedded into the corresponding grooves and fixedly welded and electrically connected with the conductive block, so that the first connecting sleeve and the groove corresponding to the first conductive sleeve on the conductive block can limit the first conductive sleeve, the second connecting sleeve and the groove corresponding to the second conductive sleeve on the conductive block can limit the second conductive sleeve, and the positions of the first conductive sleeve and the second conductive sleeve are limited, thereby avoiding the risk of shaking due to electromagnetic force.

[0028] Further, the embodiment of the present application also discloses a superconducting joint for a star simulator, the inner side wall surfaces of the first conductive sleeve and the second conductive sleeve are respectively plated with silver layers; the first conductive sleeve and the second conductive sleeve are copper sleeves, and the conductive block is a copper block.

[0029] By adopting the technical scheme, the silver layer is electroplated on the inner side wall surface of the first conductive sleeve and the second conductive sleeve, the high conductivity and low contact resistance characteristics of silver are utilized to reduce the energy loss and local heating in the current transmission process, so that the electrical stability of the superconducting joint is improved. Secondly, copper is used as the base material of the first conductive sleeve, the second conductive sleeve and the conductive block, the copper itself has excellent conductivity and thermal conductivity, can form a synergistic effect with the silver plating layer, and further reduce the overall resistance. At the same time, the conductive block and the conductive sleeve are made of the same copper material, which can avoid the problem of interface stress concentration caused by the difference in thermal expansion coefficient when dissimilar metals are welded, and ensure the mechanical strength and long-term stability of the welded connection. Through this setting mode, on the basis of ensuring the low resistance characteristics of the superconducting joint, the deformation resistance and durability of the joint in a strong electromagnetic environment are enhanced, and the failure risk caused by material mismatch or poor surface contact of the traditional joint is effectively solved.

[0030] Further, the embodiment of the present application also discloses a superconducting joint for a star simulator, the superconducting joint further comprises an insulating cover extending in the length direction, one end of the insulating cover is fixedly installed on one side of the support seat close to the clamping assembly in the length direction of the superconducting joint, and the insulating cover covers the outer periphery of the protective cover, and the cooling connecting pipe passes through the end wall of the other end of the insulating cover.

[0031] By adopting the technical scheme, the insulating cover extends in the length direction and covers the outside of the protective cover, forms an outer insulating barrier, effectively isolates the interference of the external electromagnetic field on the clamping assembly and the first cable connecting part and the second cable connecting part, and reduces the risk of electric leakage caused by electromagnetic induction. In addition, the cooling connecting pipe passes through the end wall of the other end of the insulating cover, so that the cooling medium utilizes the insulating cover to play a heat insulation effect on the inner cooling channel and the outer cooling channel during transportation, and reduces the influence of the external environment on the heat transfer of the cooling medium.

[0032] Further, the present application also provides a superconducting cable assembly of a star simulator, comprising a superconducting joint, and a first superconducting cable and a second superconducting cable; wherein the first cable connecting part of the first superconducting cable and the second cable connecting part of the second superconducting cable are fixed and electrically connected through the superconducting joint.

[0033] By adopting the technical scheme, the superconducting cable assembly is fixed and electrically connected by the superconducting joint between the first cable connecting part of the first superconducting cable and the second cable connecting part of the second superconducting cable, and forms the superconducting cable assembly with stable overall structure. Specifically, the superconducting joint serves as a connecting carrier, realizes electrical conduction between the first cable connecting part and the second cable connecting part, and limits the first cable connecting part and the second superconducting cable connecting part through the support seat, the guide seat and the clamping assembly, thereby reducing the risk of displacement, hinging and disconnection of the connection position of the first superconducting cable and the second superconducting cable of the superconducting cable assembly, enabling the superconducting cable assembly to stably conduct current, being safer and more reliable in use, and enabling the star simulator to work reliably. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A schematic diagram of the overall structure of the superconducting joint provided for the embodiment of the application is shown in the figure.

[0035] Figure 2 A schematic diagram of the local structure of the superconducting joint provided for the embodiment of the application is shown in the figure.

[0036] Figure 3 A sectional view of the superconducting joint from one perspective provided for the embodiment of the application is shown in the figure.

[0037] Figure 4 A local schematic diagram of the sectional view of the superconducting joint from one perspective provided for the embodiment of the application is shown in the figure.

[0038] Figure 5 A sectional view of the superconducting joint from another perspective provided for the embodiment of the application is shown in the figure.

[0039] Figure 6 A connection schematic diagram of the first cable connecting part and the first internal cooling channel of the superconducting joint provided for the embodiment of the application is shown in the figure.

[0040] Explanation of reference signs:

[0041] 1, support seat;

[0042] 10, first boss; 11, second boss;

[0043] 2, joint guide seat;

[0044] 3, clamping assembly;

[0045] 30, first sleeve; 31, second sleeve; 32, first pressing plate; 33, second pressing plate; 34, conductive block; 35, first external cooling channel; 36, second external cooling channel;

[0046] 4, protective cover;

[0047] 5, cooling connection pipe;

[0048] 50, cover plate; 51, insulation connector; 52, helium tube; 53, connecting boss; 54, annular boss;

[0049] 6, insulation cover;

[0050] 7, first superconducting cable;

[0051] 70, first cable connecting part; 71, first armor; 72, first internal cooling channel;

[0052] 8, second superconducting cable;

[0053] 80, second cable connecting part; 81, second armor; 82, second internal cooling channel;

[0054] L, length direction; W, extension direction. DETAILED DESCRIPTION

[0055] As described in the background, the superconducting conductor joint can electrically connect two multi-pie coils, but the superconducting conductor joint in the prior art has the risk of causing the two multi-pie coils to shake due to electromagnetic force when the two multi-pie coils are electrically connected to each other, and the position of the input end of the superconducting cable joint of the two multi-pie coils is free, and the connection position of the two multi-pie coils is offset, hinged, and disconnected during long-term use, thereby causing electrical leakage or the problem that the stellar imitator cannot work.

[0056] To solve the above problems, the application provides a superconducting joint for a stellar imitator, which can preliminarily fix the first cable connecting part and the second cable connecting part through the first boss and the second boss on the support seat when electrically connecting the first superconducting cable and the second superconducting cable, realize the constraint of the first cable connecting part and the second cable connecting part in the length direction and the extension direction, then limit and guide the first cable connecting part through the first guide hole, limit and guide the second cable connecting part through the second guide hole, thereby realizing the secondary constraint of the first cable connecting part and the second cable connecting part, and then positionally constrain the first cable connecting part and the second cable connecting part through the nested electrical connection between the sleeve inner cavity of the first sleeve and the second sleeve and the cable connecting part, so that the first cable connecting part and the second cable connecting part are reliably fixed, the connection position between the first superconducting cable and the second superconducting cable is stable during long-term shaking of the first superconducting cable and the second superconducting cable, the risk of offset, hinging, and disconnection of the connection position of the first superconducting cable and the second superconducting cable is reduced, the first superconducting cable and the second superconducting cable can stably conduct current, and the safe and reliable operation of the stellar imitator is ensured.

[0057] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0058] As shown in the drawings, Figures 1-3 The superconducting joint for the stellarator comprises a support seat 1, a joint guide seat 2 and a clamping assembly 3 fixedly connected in sequence along the length direction L of the superconducting joint; and the support seat 1, the joint guide seat 2 and the clamping assembly 3 are fixedly connected along the length direction L to form an integral support frame, which provides stable support for the superconducting cable.

[0059] Specifically, along the extension direction W perpendicular to the length direction L, the support seat 1 is provided with a first boss 10 and a second boss 11 at intervals, and each of the first boss 10 and the second boss 11 is provided with a through hole penetrating the boss along the length direction L of the superconducting joint; the joint guide seat 2 is provided with a first guide hole and a second guide hole at intervals, and both the first guide hole and the second guide hole penetrate the joint guide seat 2 along the length direction L of the superconducting joint; the clamping assembly 3 comprises a first sleeve 30 and a second sleeve 31 provided at intervals along the extension direction W, and one end of each of the first sleeve 30 and the second sleeve 31 is fixedly connected to the end of the joint guide seat 2 away from the support seat 1 along the length direction L of the superconducting joint, and the first sleeve 30 and the second sleeve 31 are electrically connected.

[0060] More specifically, when the first superconducting cable 7 and the second superconducting cable 8 are electrically connected through the superconducting joint in the stellarator, the first cable connecting part 70 of the first superconducting cable 7 extends out of the first armor 71, penetrates the through hole of the first boss 10 and the first guide hole in sequence, and extends into the inner cavity of the first sleeve 30 to be electrically connected with the first sleeve 30, thereby realizing the fixation of the first cable connecting part 70; the second cable connecting part 80 of the second superconducting cable 8 extends out of the second armor 81, penetrates the through hole of the second boss 11 and the second guide hole in sequence, and extends into the inner cavity of the second sleeve 31 to be electrically connected with the second sleeve 31, thereby realizing the fixation of the second cable connecting part 80; so that the first cable connecting part 70 is electrically connected with the second cable connecting part 80 through the first sleeve 30 and the second sleeve 31 in sequence, and finally realizes the electrical connection between the first cable connecting part 70 and the second cable connecting part 80, thereby making the first superconducting cable 7 and the second superconducting cable 8 electrically conductive; and the end face of the first boss 10 (see Figure 3 ) away from the joint guide seat 2 abuts against the end face of the first armor 71, and the end face of the second boss 11 (see Figure 3 ) away from the joint guide seat 2 abuts against the end face of the second armor 81, and the abutment of the end face and the armor forms a limit in the length direction L, effectively preventing the first cable connecting part 70 and the second cable connecting part 80 from being displaced along the length direction L under the action of electromagnetic force.

[0061] It should be noted that the first cable connection part 70 is formed by removing the armor of the connection end of the first superconducting cable 7, and the second cable connection part 80 is formed by removing the armor of the connection end of the second superconducting cable 8, so that the electrical core of the connection end of the first cable connection part 70 and the second cable connection part 80 is exposed, and then the first cable connection part 70 and the second cable connection part 80 are formed; that is, the first cable connection part 70 and the second cable connection part 80 are both made of superconducting material, such as high-purity oxygen-free copper.

[0062] In summary, when the first superconducting cable 7 and the second superconducting cable 8 are electrically connected, the first cable connection part 70 is inserted through the through hole of the first boss 10, the second cable connection part 80 is inserted through the through hole of the second boss 11, and the end face of the first boss 10 away from the one end face of the joint guide seat 2 abuts against the one end face of the first armor 71, and the end face of the second boss 11 away from the one end face of the joint guide seat 2 abuts against the one end face of the second armor 81, thereby realizing the primary fixation of the first cable connection part 70 and the second cable connection part 80, effectively preventing the displacement of the first cable connection part 70 and the second cable connection part 80 along the length direction L under the action of electromagnetic force, and also preventing the first cable connection part 70 and the second cable connection part 80 from being exposed, thereby reducing the risk of electrical leakage at the position where the first cable connection part 70 and the second cable connection part 80 are connected to the support seat 1.

[0063] Further, after the first cable connection part 70 is inserted through the through hole of the first boss 10 and the second cable connection part 80 is inserted through the through hole of the second boss 11, the first cable connection part 70 is further inserted into and through the first guide hole, and the second cable connection part 80 is further inserted into and through the second guide hole, thereby realizing the secondary fixation of the first cable connection part 70 and the second cable connection part 80; in addition, the first sleeve 30 and the second sleeve 31 are arranged in a spaced manner, and the nested electrical connection between the inner cavity of the sleeve and the cable connection part is achieved, which not only realizes electrical conduction but also forms a constraint in the extension direction W.

[0064] Therefore, when the superconducting joint is used to electrically connect the first superconducting cable 7 and the second superconducting cable 8, the first cable connecting portion 70 and the second cable connecting portion 80 are jointly limited by the support seat 1, the guide seat, and the clamping assembly 3, so that the first cable connecting portion 70 and the second cable connecting portion 80 are reliably fixed. During a long-time shaking process of the first superconducting cable 7 and the second superconducting cable 8, the connection position between the first superconducting cable 7 and the second superconducting cable 8 is stable, the risk of displacement, hinging, and disconnection of the connection position of the first superconducting cable 7 and the second superconducting cable 8 is reduced, the first superconducting cable 7 and the second superconducting cable 8 can stably conduct current, and the safe and reliable operation of the stellarator is ensured.

[0065] Further, the structure and arrangement of the clamping assembly 3 are explained below.

[0066] Optionally, in an implementable embodiment, as shown in Figure 3 and Figure 5 , the clamping assembly 3 further includes a first pressing plate 32 and a second pressing plate 33. The first pressing plate 32 is sleeved on the side of the first sleeve 30 away from the second sleeve 31, the second pressing plate 33 is sleeved on the side of the second sleeve 31 away from the first sleeve 30, and the first pressing plate 32 is fixedly connected with the second pressing plate 33. Thus, the rigid constraint on the first cable connecting portion 70 and the second cable connecting portion 80 is enhanced. In addition, the first pressing plate 32, the second pressing plate 33, and the joint support seat 1 are used to resist the electromagnetic force acting on the superconducting joint during the operation of the stellarator, so as to keep the structure stable, reduce the risk of superconducting loss of the first cable connecting portion 70 and the second cable connecting portion 80, and make the superconducting joint more safe and reliable. It should be understood that superconducting loss refers to the phase change process from a superconducting state to a normal conducting state when the temperature, magnetic field, or current of a superconductor exceeds a critical value.

[0067] Optionally, in an implementable embodiment, the clamping assembly 3 further comprises an electrically conductive block 34 arranged to extend along the length direction L, and the electrically conductive block 34 is pressed between the first sleeve 30 and the second sleeve 31 along the extension direction W, so that the first sleeve 30 and the second sleeve 31 are electrically connected through the electrically conductive block 34, thereby making the first sleeve 30 and the second sleeve 31 form a stable surface contact electrical connection and have better electrical conductivity.

[0068] Specifically, the electrically conductive block 34 is also pressed between the first pressing plate 32 and the second pressing plate 33, so that the first pressing plate 32 and the second pressing plate 33 are fixedly connected through the electrically conductive block 34. It should be understood that when the first pressing plate 32 and the second pressing plate 33 are fixedly connected through the electrically conductive block 34, the fixed connection mode can be that a plurality of threaded holes are arranged on the first pressing plate 32 and the second pressing plate 33 along the length direction L, and the plurality of threaded holes on the first pressing plate 32 correspond one-to-one to the plurality of threaded holes on the second pressing plate 33, a connecting hole corresponding to the plurality of threaded holes is arranged on the electrically conductive block 34, and then the first pressing plate 32 and the second pressing plate 33 are fixedly connected through bolts and screws. It should be noted that the number of the plurality of threaded holes and the plurality of connecting holes can be 2, 5, 7, etc., which is not limited in the present embodiment.

[0069] More specifically, the structure and arrangement of the first sleeve 30 and the second sleeve 31 are not limited.

[0070] In an implementable embodiment, the first sleeve 30 comprises a first electrically conductive sleeve and a first connecting sleeve, and the first connecting sleeve is fixedly sleeved on one side of the first electrically conductive sleeve close to the first pressing plate 32; the second sleeve 31 comprises a second electrically conductive sleeve and a second connecting sleeve, and the second connecting sleeve is fixedly sleeved on one side of the second electrically conductive sleeve close to the second pressing plate 33; the electrically conductive block 34 is provided with grooves corresponding to the first electrically conductive sleeve and the second electrically conductive sleeve on both sides thereof, and at least part of the first electrically conductive sleeve and the second electrically conductive sleeve are respectively embedded into the corresponding grooves and fixedly welded and electrically connected with the electrically conductive block 34, thereby realizing surface contact electrical connection and establishing a low-resistance path.

[0071] More specifically, in the length direction L of the superconducting joint, the first connecting sleeve and the second connecting sleeve are fixedly connected with the joint guide seat 2 at one end close to the joint guide seat 2, and in the extension direction W, the outer wall surface of the first connecting sleeve is attached to the first pressing plate 32, and the outer wall surface of the second connecting sleeve is attached to the second pressing plate 33; so as to realize the limiting of the first conductive sleeve through the first connecting sleeve and the recess on the conductive block 34 corresponding to the first conductive sleeve, and the limiting of the second conductive sleeve through the second connecting sleeve and the recess on the conductive block 34 corresponding to the second conductive sleeve, thereby limiting the positions of the first conductive sleeve and the second conductive sleeve, avoiding the risk of shaking due to electromagnetic force. It should be noted that the joint guide seat 2, the first connecting sleeve and the second connecting sleeve are made of stainless steel, thereby improving the structural strength of the superconducting joint.

[0072] More specifically, when the first superconducting cable 7 and the second superconducting cable 8 are electrically connected through the superconducting joint, the first cable connecting part 70 extends into the first conductive sleeve and is welded and fixed with the first conductive sleeve, and the second cable connecting part 80 extends into the second conductive sleeve and is welded and fixed with the second conductive sleeve.

[0073] In an implementable embodiment, in order to make the conductivity of the superconducting joint better, silver layers are electroplated on the inner side walls of the first conductive sleeve and the second conductive sleeve, the high conductivity and low contact resistance characteristics of silver are utilized to reduce energy loss and local heating in the current transmission process, thereby improving the electrical stability of the superconducting joint; the first conductive sleeve and the second conductive sleeve are both copper sleeves, and the conductive block 34 is a copper block, since copper itself has excellent conductivity and thermal conductivity, it can form a synergistic effect with the silver plating layer, further reducing the overall resistance; at the same time, the conductive block 34 and the conductive sleeve are both of the same copper material, which can avoid the problem of interface stress concentration caused by the difference in thermal expansion coefficient when dissimilar metals are welded, ensuring the mechanical strength and long-term stability of the welded connection.

[0074] The above structure enhances the anti-deformation ability and durability of the joint in a strong electromagnetic environment on the basis of ensuring the low resistance characteristics of the superconducting joint, effectively solves the failure risk caused by material mismatching or poor surface contact of traditional joints, thereby improving the conductivity of the superconducting joint. It should be understood that the outer peripheral wall of the first cable connecting part 70 and the second cable connecting part 80 can also be electroplated with a silver layer, thereby further improving the conductivity.

[0075] Further, in an embodiment, as Figure 3As shown, in order to more easily install the first cable connector 70 and the second cable connector 80 to this superconducting connector, in the length direction L, the through hole of the first boss 10 is aligned with one end of the first guide hole, and the through hole of the second boss 11 is aligned with one end of the second guide hole. This avoids friction or jamming caused by path deviation when the first cable connector 70 passes through the through hole and the first guide hole of the first boss 10 in sequence, and the second cable connector 80 passes through the through hole and the second guide hole of the second boss 11 in sequence, making it easier to install the first cable connector 70 and the second cable connector 80.

[0076] Furthermore, one end of the first sleeve 30 is directly opposite the other end of the first guide hole, and one end of the second sleeve 31 is directly opposite the other end of the second guide hole. This ensures that the first cable connector 70 directly enters the inner cavity of the first sleeve 30 after passing through the first guide hole, and the second cable connector 80 directly enters the inner cavity of the second sleeve 31 after passing through the second guide hole, forming a continuous conductive path without bends. This also avoids the problem of friction or jamming caused by path deviation.

[0077] Furthermore, in one implementation, such as Figure 3 As shown, to reduce the influence of external magnetic field forces on the first cable connection portion 70 and the second cable connection portion 80, the superconducting connector also includes a protective cover 4 disposed along the length direction L. One end of the protective cover 4 is fixedly installed on the side of the support base 1 near the clamping assembly 3 along the length direction L, while the other end is disposed away from the support base 1 along the length direction L. The clamping assembly 3 is located inside the protective cover 4, thus blocking direct contact between the clamping assembly 3 and the external environment after it is surrounded by the protective cover 4. This reduces the direct effect of electromagnetic forces on the clamping assembly 3, improves the structural stability of the superconducting connector in complex electromagnetic environments, and increases the electrical conduction efficiency between the first cable connection portion 70 and the second cable connection portion 80. It should be noted that the protective cover 4 is made of stainless steel, further enhancing the structural strength of this superconducting connector.

[0078] Furthermore, in one implementation, such as Figure 3As shown, since the superconducting joint is electrically connected to the first cable connecting part 70 and the second cable connecting part 80, in the process of conducting current, if the temperature exceeds the critical value, the material of the first cable connecting part 70 and the second cable connecting part 80 will restore the resistance, resulting in energy loss and heat, thereby causing the loss of superconductivity and destroying the superconducting performance. Therefore, the superconducting joint further comprises a cooling connecting pipe 5 extending in the length direction L, and the support seat 1, the protective cover 4 and the cooling connecting pipe 5 are sequentially fixedly connected in the length direction L. The center of the first cable connecting part 70 is provided with a first inner cooling channel 72 extending in a spiral shape along the length direction L of the first cable connecting part 70; and the center of the second cable connecting part 80 is provided with a second inner cooling channel 82 extending in a spiral shape along the length direction L of the second cable connecting part 80.

[0079] Specifically, the cooling connecting pipe 5 is in communication with the input ends of the first inner cooling channel 72 and the second inner cooling channel 82, respectively, so as to input the cooling medium into the first inner cooling channel 72 and the second inner cooling channel 82 through the cooling connecting pipe 5. It should be understood that the cooling medium can be selected from helium liquid, liquid nitrogen and the like, which is not limited in the embodiment.

[0080] More specifically, when the first superconducting cable 7 and the second superconducting cable 8 are electrically connected through the superconducting joint, the star simulator inputs the cooling medium into the first inner cooling channel 72 and the second inner cooling channel 82 through the cooling connecting pipe 5 when working, so as to realize rapid cooling of the first cable connecting part 70 and the second cable connecting part 80, thereby enhancing the mechanical properties of the superconducting material of the first cable connecting part 70 and the second cable connecting part 80, reducing the stress damage caused by thermal expansion and contraction or current impact, and making the superconducting material of the first cable connecting part 70 and the second cable connecting part 80 lower than the critical temperature, keeping the superconducting state, and ensuring the stability and efficiency of current transmission.

[0081] In addition, the first inner cooling channel 72 and the second inner cooling channel 82 are respectively arranged in a spiral shape, thereby prolonging the flow path of the cooling medium in the channel and increasing the heat exchange area with the first cable connecting part 70 and the second cable connecting part 80, thereby significantly improving the heat dissipation efficiency.

[0082] In one embodiment, referring to Figure 5 , the first inner cooling channel 72 can be formed by surrounding a plurality of electric core strips of the first cable connecting part 70 at the center of the first cable connecting part 70, and the second inner cooling channel 82 can be formed by surrounding a plurality of electric core strips of the second cable connecting part 80 at the center of the second cable connecting part 80.

[0083] In another embodiment, a first cooling pipe can be arranged to pass through the center of the first cable connecting part 70, and a second cooling pipe can be arranged to pass through the center of the second cable connecting part 80, which is not limited in the present embodiment.

[0084] More specifically, the structure and arrangement of the cooling connecting pipe 5 are not limited.

[0085] In one embodiment, as shown in Figure 3 the cooling connecting pipe 5 includes a cover plate 50, an insulation connecting head 51, and a helium pipe 52; wherein the other end wall of the protective cover 4 is provided with a mounting port, the cover plate 50 is arranged on the mounting port, and the center part of the cover plate 50 is provided with a connecting boss 53 extending away from the protective cover 4 along the length direction L, and the connecting boss 53 is provided with a liquid flow channel extending along the length direction L, and the liquid flow channel is in communication with the first inner cooling channel 72 and the second inner cooling channel 82, respectively.

[0086] Specifically, along the length direction L, the connecting boss 53, the insulation connecting head 51, and the helium pipe 52 are sequentially fixedly connected, and the helium pipe 52 is located on the side of the connecting boss 53 away from the protective cover 4; wherein the liquid flow channel is in communication with the insulation connecting head 51, and the insulation connecting head 51 is in communication with the helium pipe 52.

[0087] Specifically, when the superconducting joint is cooled, the helium liquid flows from the helium pipe 52 into the insulation connecting head 51, and then flows into the liquid flow channel through the insulation connecting head 51, and then flows into the first inner cooling channel 72 and the second inner cooling channel 82 through the liquid flow channel; the insulation connecting head 51 as a non-conductive part forms an electrical isolation between the helium pipe 52 and the connecting boss 53, avoiding the risk of the cooling connecting pipe 5 being electrified.

[0088] Further, in one embodiment, as shown in Figure 3 and Figure 5 in order to further improve the cooling performance of the superconducting joint, the side of the cover plate 50 close to the clamping assembly 3 is further provided with an annular boss 54, the outer wall surface of the annular boss 54 is fixedly attached to the inner wall surface of the protective cover 4, and the inner wall surface of the annular boss 54 is attached to the outer wall surface of the first pressing plate 32 and the second pressing plate 33, thereby improving the sealing performance of the cover plate 50 to the mounting port.

[0089] Specifically, the end wall of the annular boss 54, the protective cover 4, the first pressing plate 32, the support base 1, and the joint guide base 2 jointly enclose the first outer cooling channel 35; the end wall of the annular boss 54, the protective cover 4, the second pressing plate 33, the support base 1, and the joint guide base 2 jointly enclose the second outer cooling channel 36; wherein the output end of the first inner cooling channel 72 is in communication with the first outer cooling channel 35, and the output end of the second inner cooling channel 82 is in communication with the second outer cooling channel 36. It should be understood that the output end of the first inner cooling channel 72 and the output end of the second inner cooling channel 82 are the ends of the first inner cooling channel 72 and the second inner cooling channel 82 close to the support base 1.

[0090] More specifically, when the superconducting joint is cooled, the helium liquid flows into the first inner cooling channel 72 and the second inner cooling channel 82 via the liquid flow channel to cool the first cable connection part 70 and the second cable connection part 80, and then the output end of the first inner cooling channel 72 flows the cooling liquid to the first outer cooling channel 35, and the output end of the second inner cooling channel 82 flows the cooling liquid to the second outer cooling channel 36, forming a cooling loop that is in communication between the inside and the outside. On the premise that the first cable connection part 70 and the second cable connection part 80 can be cooled first, the clamping assembly 3 can also be cooled twice, so that the entire superconducting joint is in a low-temperature state, thereby making the superconducting joint more reliable in use and ensuring long-term stable operation of the superconducting joint.

[0091] The following explains how the inner cooling channel and the outer cooling channel are in communication.

[0092] Please refer to Figure 4 , which illustrates the communication between the first inner cooling channel 72 and the first outer cooling channel 35. There is a gap between the joint guide base 2 and the support base 1, and there are gaps between the multiple electric cores of the output end of the first inner cooling channel 72. Liquid helium flows back from the first inner cooling channel 72 to the first outer cooling channel 35 through the gaps between the multiple electric cores.

[0093] Further, in an embodiment, as shown in Figure 1 and Figure 3 , the superconducting joint further comprises an insulating cover 6 extending along the length direction L. In the length direction L of the superconducting joint, one end of the insulating cover 6 is fixedly installed on the side of the support base 1 close to the clamping assembly 3, and the insulating cover 6 covers the outer periphery of the protective cover 4, and the cooling connection pipe 5 passes through the end wall of the other end of the insulating cover 6.

[0094] Specifically, the insulating cover 6 extends along the length direction L and covers the outside of the protective cover 4 to form an outer insulating barrier, effectively isolating the external electromagnetic field from interfering with the clamping assembly 3 and the first cable connecting part 70 and the second cable connecting part 80, and reducing the risk of electric leakage caused by electromagnetic induction. In addition, the cooling connecting pipe 5 passes through the end wall of the other end of the insulating cover 6, so that the cooling medium uses the insulating cover 6 to play a heat insulation role on the inner cooling channel and the outer cooling channel during transportation, reducing the influence of the external environment on the heat transfer of the cooling medium.

[0095] The application also provides a superconducting cable assembly of a stellar simulator, comprising a superconducting joint, and a first superconducting cable 7 and a second superconducting cable 8; wherein the first cable connecting part 70 of the first superconducting cable 7 and the second cable connecting part 80 of the second superconducting cable 8 are fixed and electrically connected through the superconducting joint.

[0096] Specifically, the superconducting cable assembly fixes and electrically connects the first cable connecting part 70 of the first superconducting cable 7 and the second cable connecting part 80 of the second superconducting cable 8 through the superconducting joint, forming a superconducting cable assembly with stable overall structure. Specifically, the superconducting joint serves as a connecting carrier, which not only realizes the electrical conduction of the first cable connecting part 70 and the second cable connecting part 80, but also limits the first cable connecting part 70 and the second cable connecting part 80 through the support seat 1, the guide seat and the clamping assembly 3; thereby reducing the risk of displacement, hinging and disconnection of the connection position of the first superconducting cable 7 and the second superconducting cable 8 of the superconducting cable assembly, so that the superconducting cable assembly can stably conduct current, is safer and more reliable to use, and also improves the reliability of the stellar simulator.

[0097] The above describes the embodiments of the application by specific examples, and those skilled in the art can easily understand other advantages and effects of the application from the content disclosed in the description. Although the description of the application is introduced in combination with the preferred embodiments, it does not mean that the features of the application are limited to the embodiments. On the contrary, the purpose of introducing the application in combination with the embodiments is to cover other options or modifications that can be extended based on the claims of the application. In order to provide a deep understanding of the application, many specific details will be included in the above description. The application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the application, some specific details will be omitted in the description. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0098] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0099] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0100] The terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0101] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

Claims

1. A superconducting joint for a stellarator, characterized by, The superconducting joint comprises a support seat, a joint guide seat and a clamping assembly which are sequentially fixedly connected along the length direction of the superconducting joint; The support seat is provided with a first boss and a second boss at intervals along the extension direction perpendicular to the length direction, and each of the first boss and the second boss is provided with a through hole penetrating through the boss along the length direction of the superconducting joint; the joint guide seat is provided with a first guide hole and a second guide hole at intervals, and the first guide hole and the second guide hole both penetrate through the joint guide seat along the length direction of the superconducting joint; The clamping assembly comprises a first sleeve and a second sleeve which are provided at intervals along the extension direction, and one end of each of the first sleeve and the second sleeve is fixedly connected to the end of the joint guide seat away from the support seat along the length direction of the superconducting joint, and the first sleeve and the second sleeve are electrically connected; wherein, When the first superconducting cable and the second superconducting cable in the star simulator are electrically connected through the superconducting joint, the first cable connecting part of the first superconducting cable extends out of the first armor, sequentially passes through the through hole of the first boss and the first guide hole, and extends into the inner cavity of the first sleeve to be electrically connected with the first sleeve; the second cable connecting part of the second superconducting cable extends out of the second armor, sequentially passes through the through hole of the second boss and the second guide hole, and extends into the inner cavity of the second sleeve to be electrically connected with the second sleeve, so that the first cable connecting part is electrically connected with the second cable connecting part through the first sleeve and the second sleeve in sequence, and the end face of the first boss away from the joint guide seat abuts against the end face of the first armor, and the end face of the second boss away from the joint guide seat abuts against the end face of the second armor; The superconducting joint further comprises a protective cover provided along the length direction, and one end of the protective cover is fixedly installed on the side of the support seat close to the clamping assembly along the length direction, and the clamping assembly is located in the protective cover; the superconducting joint further comprises a cooling connection pipe extending along the length direction, the center of the first cable connecting part is provided with a first internal cooling channel extending along the length direction of the first cable connecting part, and the center of the second cable connecting part is provided with a second internal cooling channel extending along the length direction of the second cable connecting part; and The cooling connection pipe communicates with the input ends of the first internal cooling channel and the second internal cooling channel respectively to input cooling medium into the first internal cooling channel and the second internal cooling channel through the cooling connection pipe; the cooling connection pipe comprises a cover plate, and the other end wall of the protective cover is provided with a mounting opening, and the cover plate is covered on the mounting opening; The clamping assembly further comprises a first pressing plate and a second pressing plate, the first pressing plate is sleeved on the side of the first sleeve away from the second sleeve, the second pressing plate is sleeved on the side of the second sleeve away from the first sleeve, and the first pressing plate and the second pressing plate are fixedly connected. The side of the cover plate close to the clamping assembly is further formed with an annular boss, an outer wall surface of the annular boss is fixedly attached to an inner wall surface of the protective cover, and an inner wall surface of the annular boss is attached to outer wall surfaces of the first pressing plate and the second pressing plate; and An end wall of the annular boss, the protective cover, the first pressing plate, the support seat, and the joint guide seat jointly form a first outer cooling channel; an end wall of the annular boss, the protective cover, the second pressing plate, the support seat, and the joint guide seat jointly form a second outer cooling channel; wherein An output end of the first inner cooling channel is in communication with the first outer cooling channel, and an output end of the second inner cooling channel is in communication with the second outer cooling channel.

2. The superconducting joint for a stellarator as recited in claim 1, wherein, In the length direction, the through hole of the first boss is opposite to one end of the first guide hole, one end of the first sleeve is opposite to the other end of the first guide hole, the through hole of the second boss is opposite to one end of the second guide hole, and one end of the second sleeve is opposite to the other end of the second guide hole.

3. The superconducting joint for a star simulator of claim 1, wherein, In the length direction, the support seat, the protective cover, and the cooling connection pipe are sequentially fixedly connected, the first inner cooling channel extends spirally along the length direction of the first cable connection part, and the second inner cooling channel extends spirally along the length direction of the second cable connection part.

4. The superconducting joint for a star simulator of claim 3, wherein, The cooling connection pipe further comprises an insulating joint, and a helium pipe; wherein The center part of the cover plate is formed with a connecting boss, the connecting boss extends away from the protective cover along the length direction, and the connecting boss is provided with a liquid flow channel extending along the length direction thereof, the liquid flow channel is in communication with the first inner cooling channel and the second inner cooling channel respectively; and In the length direction, the connecting boss, the insulating joint, and the helium pipe are sequentially fixedly connected, and the helium pipe is located on the side of the connecting boss away from the protective cover; wherein The liquid flow channel is in communication with the insulating joint, and the insulating joint is in communication with the helium pipe.

5. The superconducting joint for a star simulator of claim 4, wherein, The clamping assembly further comprises an electrically-conductive block extending along the length direction, in the extending direction, the electrically-conductive block is pressed between the first sleeve and the second sleeve, so that the first sleeve and the second sleeve are electrically connected through the electrically-conductive block, and the electrically-conductive block is further pressed between the first pressing plate and the second pressing plate, so that the first pressing plate and the second pressing plate are fixedly connected through the electrically-conductive block; The first sleeve comprises a first conductive sleeve and a first connecting sleeve, the first connecting sleeve is fixedly sleeved on one side of the first conductive sleeve close to the first pressing plate; the second sleeve comprises a second conductive sleeve and a second connecting sleeve, the second connecting sleeve is fixedly sleeved on one side of the second conductive sleeve close to the second pressing plate, both sides of the conductive block are respectively provided with grooves corresponding to the first conductive sleeve and the second conductive sleeve, at least part of the first conductive sleeve and the second conductive sleeve are respectively embedded into the corresponding grooves, and are fixedly welded and electrically connected with the conductive block; and, In the length direction of the superconducting joint, one end of the first connecting sleeve and the second connecting sleeve close to the joint guide seat is fixedly connected with the joint guide seat, in the extension direction, the outer wall surface of the first connecting sleeve is attached to the first pressing plate, and the outer wall surface of the second connecting sleeve is attached to the second pressing plate; When the first superconducting cable and the second superconducting cable are electrically connected through the superconducting joint, the first cable connecting part is inserted into the first conductive sleeve and is fixedly welded with the first conductive sleeve, and the second cable connecting part is inserted into the second conductive sleeve and is fixedly welded with the second conductive sleeve.

6. The superconducting joint for a star simulator of claim 5, wherein, The inner side wall surface of the first conductive sleeve and the second conductive sleeve is plated with a silver layer; the first conductive sleeve and the second conductive sleeve are copper sleeves, and the conductive block is a copper block.

7. Superconducting joint for a stellarator according to any of claims 1 to 6, characterized in that The superconducting joint further comprises an insulating cover extending along the length direction, in the length direction of the superconducting joint, one end of the insulating cover is fixedly installed on one side of the support seat close to the clamping assembly, and the insulating cover covers the outer periphery of the protective cover, and the cooling connecting pipe passes through the end wall of the other end of the insulating cover.

8. A superconducting cable assembly for a stellarator, characterized by The superconducting joint comprises the first superconducting cable and the second superconducting cable, and the superconducting joint comprises the superconducting joint according to any one of claims 1-7. The first cable connecting part of the first superconducting cable and the second cable connecting part of the second superconducting cable are fixedly and electrically connected through the superconducting joint.

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