A binary coaxial bipolar current lead structure for high-field superconducting magnets

Abstract

The application discloses a binary coaxial bipolar current lead structure for a high-field superconducting magnet, which comprises a first joint, a second joint, a third joint, a primary current lead and a secondary current lead, one end of the primary current lead is connected with the first joint, the other end of the primary current lead is connected with one end of the secondary current lead through the second joint, and the other end of the secondary current lead is connected with the third joint; the first joint comprises a first supporting fixing part, a first positive electrode insulating cylinder, a first negative electrode insulating cylinder, a first positive electrode conductive joint and a first negative electrode conductive joint; the second joint comprises a second supporting fixing part, a second positive electrode insulating cylinder, a second negative electrode insulating cylinder, a second positive electrode conductive joint and a second negative electrode conductive joint; and the third joint comprises a third supporting fixing part, an insulating part, a third positive electrode conductive joint and a third negative electrode conductive joint. The binary coaxial bipolar current lead structure for the high-field superconducting magnet has the advantages that the use efficiency and working performance of the high-field superconducting magnet can be ensured, and the applicability of the superconducting magnet is improved.

Description

Technical Field

[0001] This invention relates to the field of binary high-temperature superconducting current lead technology, specifically a binary coaxial bipolar current lead structure for high-field superconducting magnets. Background Technology

[0002] Strong magnetic fields are essential extreme experimental conditions for research in physics, materials science, life sciences, and chemistry. Superconducting materials, with their perfect diamagnetism and zero electrical resistance in the superconducting state, have become the preferred choice for fabricating high-field magnets. Currently, superconducting magnets are widely used in cutting-edge research across multiple disciplines, including physics, materials science, chemistry, and biology. Furthermore, with the development of superconducting magnet technology and cryogenics, conduction-cooled high-field superconducting magnets have become the primary high-field equipment for research teams conducting multidisciplinary cutting-edge research under strong magnetic fields. In addition, for cutting-edge scientific research, the operating mode of high-field superconducting magnets is often variable-field mode (i.e., corresponding cutting-edge scientific research experiments need to be carried out under different magnetic field conditions). Therefore, the current leads connecting the room-temperature power supply and the superconducting magnet coils have become indispensable components of superconducting magnets for conducting multidisciplinary cutting-edge research under strong magnetic fields.

[0003] In existing high-field superconducting magnets used in scientific research, the binary current leads are mostly distributed separately for the positive and negative poles. During the excitation and operation of the superconducting magnet, the current leads act as the main heat source in the superconducting magnet system. The separate distribution of the positive and negative pole current leads creates two main heat sources in the superconducting magnet system, significantly reducing the stability of the superconducting magnet's operation and increasing the risk of quench failure. Furthermore, for conduction-cooled high-field superconducting magnets, the cooling capacity comes from the refrigerator. The cooling demand for separately distributed current leads is greater, which undoubtedly increases the cooling time without increasing the refrigerator's energy, thus reducing the utilization efficiency of the high-field superconducting magnet.

[0004] In existing technologies, commonly used binary current leads require conventional metal support structures for their secondary high-temperature superconducting conductive leads. During the excitation or operation of the superconducting magnet, the current leads operate within a wide temperature range (300K-4.2K), making conductive heat the primary source of heat leakage. The conventional metal support structure inevitably increases this heat leakage, thus increasing cooling capacity consumption. If the cooling capacity is insufficient, this conductive heat leakage may be conducted to the superconducting magnet coil, potentially causing the superconducting magnet to lose its quench and severely impacting its performance.

[0005] In existing technologies, commonly used binary current leads consist of a primary conductive lead, a secondary conductive lead, and all connectors fixedly welded together. During the installation of superconducting magnet systems, the length of these current leads is difficult to adjust in real-time according to the temperature zones of the magnet system. However, for customized superconducting magnet systems applied to cutting-edge multidisciplinary research, the physical dimensions must be tailored to specific scientific research needs. Fixed-length current leads, to some extent, limit the physical dimensions of customized superconducting magnet systems, affecting their applicability. Summary of the Invention

[0006] The technical problem to be solved by this invention is how to ensure the efficiency and performance of high-field superconducting magnets and improve their applicability.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A binary coaxial bipolar current lead structure for a high-field superconducting magnet includes a first connector, a second connector, a third connector, a primary current lead, and a secondary current lead. One end of the primary current lead is connected to the first connector, and the other end is connected to one end of the secondary current lead through the second connector. The other end of the secondary current lead is connected to the third connector.

[0009] The first connector includes a first support fixing member, a first positive insulating cylinder, a first negative insulating cylinder, a first positive conductive connector, and a first negative conductive connector. The first support fixing member is provided with the first positive insulating cylinder and the first negative insulating cylinder. The first positive insulating cylinder is coaxially disposed inside the first negative insulating cylinder. The first positive conductive connector is disposed inside the first positive insulating cylinder. The first negative conductive connector is disposed between the first positive insulating cylinder and the first negative insulating cylinder. The first positive conductive connector and the first negative conductive connector are correspondingly connected to the positive and negative terminals of the primary current lead.

[0010] The second connector includes a second support fixing member, a second positive electrode insulating cylinder, a second negative electrode insulating cylinder, a second positive electrode conductive connector, and a second negative electrode conductive connector. The second support fixing member is provided with a second positive electrode insulating cylinder and a second negative electrode insulating cylinder. The second positive electrode insulating cylinder is coaxially disposed inside the second negative electrode insulating cylinder. The second positive electrode conductive connector passes through the second positive electrode insulating cylinder. The two ends of the second positive electrode conductive connector are respectively connected to the positive terminals of the primary current lead and the secondary current lead. The second negative electrode conductive connector passes through the gap between the second positive electrode insulating cylinder and the second negative electrode insulating cylinder. The two ends of the second negative electrode conductive connector are respectively connected to the negative terminals of the primary current lead and the secondary current lead.

[0011] The third connector includes a third support fixing member, an insulating member, a third positive conductive connector, and a third negative conductive connector. The insulating member is provided on the third support fixing member. The third positive conductive connector and the third negative conductive connector pass through the insulating member. The third positive conductive connector and the third negative conductive connector are respectively connected to the positive and negative terminals of the secondary current lead.

[0012] This invention can ensure the efficiency and performance of high-field superconducting magnets and improve their applicability.

[0013] Preferably, the first positive electrode conductive connector includes a positive electrode connector rod and a first positive electrode connector groove structure. The positive electrode connector rod is disposed inside the first positive electrode insulating cylinder. One end of the first positive electrode connector groove structure is connected to the positive electrode connector rod, and the other end is connected to the positive electrode of the primary current lead.

[0014] Preferably, the first negative electrode conductive connector includes a negative electrode connector rod and a first negative electrode connector groove structure. The negative electrode connector rod is disposed between the first positive electrode insulating cylinder and the first negative electrode insulating cylinder. One end of the first negative electrode connector groove structure is connected to the negative electrode connector rod, and the other end is connected to the negative electrode of the primary current lead.

[0015] Preferably, the second positive electrode conductive connector includes a second positive electrode connector groove structure and a second positive electrode single-sided connector groove structure. The opposite ends of the second positive electrode connector groove structure and the second positive electrode single-sided connector groove structure are disposed inside and connected to the second positive electrode insulating cylinder. The end of the second positive electrode connector groove structure away from the second positive electrode insulating cylinder is connected to the positive electrode of the primary current lead, and the end of the second positive electrode single-sided connector groove structure away from the second positive electrode insulating cylinder is connected to the positive electrode of the secondary current lead.

[0016] Preferably, the second negative electrode conductive connector includes a conductive copper ring, a second negative electrode connector groove structure, and a second negative electrode single-sided connector groove structure. The conductive copper ring is disposed between the second positive electrode insulating cylinder and the second negative electrode insulating cylinder. One end of the second negative electrode connector groove structure is connected to the conductive copper ring, and the other end is connected to the negative electrode of the primary current lead. One end of the second negative electrode single-sided connector groove structure is connected to the conductive copper ring, and the other end is connected to the negative electrode of the secondary current lead.

[0017] Preferably, both the second positive conductive connector and the second negative conductive connector are connected to the secondary current lead through a connector cover.

[0018] Preferably, the first support fixing member, the second support fixing member, and the third support fixing member are all support cylinder structures. The support cylinder structure includes a support cylinder and an insulating sealing ring. One end of the support cylinder is provided with a connecting flange. The end face of the connecting flange is provided with an annular groove, and the insulating sealing ring is provided in the annular groove.

[0019] Preferably, the number of the first positive conductive connector and the second positive conductive connector is 1, and the number of the first negative conductive connector and the second positive conductive connector is 4.

[0020] Preferably, the primary current lead includes a primary positive conductive lead and a primary negative conductive lead. The two ends of the primary positive conductive lead are respectively connected to a first positive conductive connector and a second positive conductive connector, and the two ends of the primary negative conductive lead are respectively connected to a first negative conductive connector and a second negative conductive connector.

[0021] Preferably, the secondary current lead includes a secondary positive conductive lead and a secondary negative conductive lead, with the two ends of the secondary positive conductive lead connected to a second positive conductive connector and a third positive conductive connector, respectively, and the two ends of the secondary negative conductive lead connected to a second negative conductive connector and a third negative conductive connector, respectively.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The invention achieves a coaxial distribution in one location, which significantly reduces the risk of magnet instability caused by heating of the current leads. At the same time, for high-field superconducting magnets with conduction cooling, the coaxial distribution of the bipolar current leads proposed in this invention can reduce the cooling time of the current leads by the refrigerator without increasing the cooling power.

[0024] 2. This invention eliminates the need for a support structure with conductive leads. The conductive leads are fixed to the corresponding magnet cover plate or cold shield cover plate through current lead connectors at both ends of the leads, which significantly reduces the overall heat leakage of the current leads, lowers the cooling cost, and further enhances the working stability of the superconducting magnet system.

[0025] 3. This invention enables modular installation of current leads in stages, and allows adjustment of the cross-sectional area of ​​each stage of conductors according to the maximum operating current of the superconducting magnet, as well as adjustment of the length of each stage of conductive leads according to the temperature range of each stage of the superconducting magnet. It is particularly suitable for customized superconducting magnet systems applied to cutting-edge research in multiple disciplines. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the first connector in an embodiment of the present invention;

[0028] Figure 3 This is a partial structural diagram of the first connector according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the second connector in an embodiment of the present invention;

[0030] Figure 5 This is a partial structural schematic diagram of the second connector according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the third connector in an embodiment of the present invention;

[0032] Figure 7 This is a partial structural diagram of the third connector according to an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the support cylinder structure according to an embodiment of the present invention. Detailed Implementation

[0034] To facilitate understanding of the technical solution of the present invention by those skilled in the art, the technical solution of the present invention will now be further described in conjunction with the accompanying drawings.

[0035] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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.

[0036] In this application, unless otherwise expressly specified and limited, 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise expressly and specifically limited.

[0037] See Figure 1 This embodiment discloses a binary coaxial bipolar current lead structure for a high-field superconducting magnet, including a first connector 1, a second connector 2, a third connector 3, a primary current lead 4, and a secondary current lead 5. One end of the first connector 1 is connected to the primary current lead 4, and the other end is used to connect to a room temperature power supply. The end of the primary current lead 4 away from the first connector 1 is connected to the second connector 2. The other end of the second connector 2 is connected to the secondary current lead 5. The end of the secondary current lead 5 away from the second connector 2 is connected to the third connector 3. The other end of the third connector 3 is connected to a low-temperature superconducting wire 6 for the magnet coil output.

[0038] In this embodiment, the primary current lead 4 includes one primary positive conductive lead 41 and four primary negative conductive leads 42, with the four primary negative conductive leads 42 arranged circumferentially around the primary positive conductive lead 41. The two ends of the primary positive conductive lead are respectively connected to a first positive conductive connector and a second positive conductive connector, and the two ends of the primary negative conductive leads are respectively connected to a first negative conductive connector and a second negative conductive connector.

[0039] The secondary current lead 5 includes one secondary positive conductive lead 51 and four secondary negative conductive leads 52, with the four secondary negative conductive leads 52 arranged circumferentially around the one secondary positive conductive lead 51. The two ends of the secondary positive conductive lead are respectively connected to a second positive conductive connector and a third positive conductive connector, and the two ends of the secondary negative conductive leads are respectively connected to a second negative conductive connector and a third negative conductive connector.

[0040] See Figure 2 and Figure 3 The first connector 1 includes a first support fixing member 11, a first positive electrode insulating cylinder 12, a first negative electrode insulating cylinder 13, a first positive electrode conductive connector 14, and a first negative electrode conductive connector 15. The bottom periphery of the first support fixing member 11 is connected to the magnet system cover plate, and the gap of the connector is filled with highly thermally conductive insulating sealant. The first positive electrode insulating cylinder 12 and the first negative electrode insulating cylinder 13 are provided on the first support fixing member 11. The first positive electrode insulating cylinder 12 is coaxially arranged inside the first negative electrode insulating cylinder 13. One end of the first positive electrode conductive connector 14 is arranged inside the first positive electrode insulating cylinder 13, and the other end is connected to the first-stage positive electrode conductive lead 41. One end of the first negative electrode conductive connector 15 is arranged between the first positive electrode insulating cylinder 12 and the first negative electrode insulating cylinder 13, and the other end is connected to four first-stage negative electrode conductive leads 42.

[0041] Furthermore, the first support fixing member 11 is provided with fixing bolts, which sequentially pass through the first support fixing member 11, the first negative electrode insulating cylinder 13, the first negative electrode conductive connector 15, and the first positive electrode insulating cylinder 12 and connect to the first positive electrode conductive connector 14, so that the first positive electrode insulating cylinder 12, the first negative electrode insulating cylinder 13, the first positive electrode conductive connector 14, and the first negative electrode conductive connector 15 are stably fixed on the first support fixing member 11.

[0042] The first positive electrode conductive connector 14 includes a positive electrode connector rod 141 and a first positive electrode connector groove structure 142. The positive electrode connector rod 141 is coaxially disposed inside the first positive electrode insulating cylinder 12. The positive electrode connector rod 141 is provided with a mounting hole. One end of the first positive electrode connector groove structure 142 is connected to the mounting hole on the positive electrode connector rod 141, and the other end is connected to the primary positive electrode conductive lead 41.

[0043] The first negative electrode conductive connector 15 includes a negative electrode connector rod 151 and a first negative electrode connector groove structure 152. The negative electrode connector rod 151 is disposed between the first positive electrode insulating cylinder 12 and the first negative electrode insulating cylinder 13. The negative electrode connector rod 151 has four mounting holes evenly distributed around the first positive electrode connector groove structure 142. Each mounting hole is connected to a first negative electrode connector groove structure 152. The other end of each first negative electrode connector groove structure 152 is connected to a primary negative electrode conductive lead 42.

[0044] See Figure 4 and Figure 5 The second connector 2 includes a second support and fixing member 21, a second positive electrode insulating cylinder 22, a second negative electrode insulating cylinder 23, a second positive electrode conductive connector 24, and a second negative electrode conductive connector 25. The bottom periphery of the second support and fixing member 21 is connected to the first-stage cold shield cover plate, and the gap of the connector is filled with highly thermally conductive insulating sealant. The second support and fixing member 21 is provided with a second positive electrode insulating cylinder 22 and a second negative electrode insulating cylinder 23. The second positive electrode insulating cylinder 22 is coaxially arranged inside the second negative electrode insulating cylinder 23. The second positive electrode conductive connector 24 passes through the second positive electrode insulating cylinder 22. The two ends of the second positive electrode conductive connector 24 are respectively connected to a first-stage positive electrode conductive lead 41 and a second-stage positive electrode conductive lead 51. The second negative electrode conductive connector 25 passes through the gap between the second positive electrode insulating cylinder 22 and the second negative electrode insulating cylinder 23. The two ends of the second negative electrode conductive connector 25 are respectively connected to a first-stage negative electrode conductive lead 42 and a second-stage negative electrode conductive lead 52.

[0045] Furthermore, the second support fixing member 21 is provided with fixing bolts, which sequentially pass through the second support fixing member 21, the second negative electrode insulating cylinder 23, the second negative electrode conductive connector 25, and the second positive electrode insulating cylinder 22 and connect to the second positive electrode conductive connector 24, so that the second positive electrode insulating cylinder 22, the second negative electrode insulating cylinder 23, the second positive electrode conductive connector 24, and the second negative electrode conductive connector 25 are stably fixed on the second support fixing member 21.

[0046] The second positive electrode conductive connector 24 includes a second positive electrode connector groove structure 241 and a second positive electrode single-sided connector groove structure 242. The opposite ends of the second positive electrode connector groove structure 241 and the second positive electrode single-sided connector groove structure 242 are connected inside the second positive electrode insulating cylinder 22. The end of the second positive electrode connector groove structure 241 away from the second positive electrode insulating cylinder 22 is connected to the primary positive electrode conductive lead 41. The end of the second positive electrode single-sided connector groove structure 242 away from the second positive electrode insulating cylinder 22 is connected to the secondary positive electrode conductive lead 51 through the connector cover 7 and is fixed by soldering under certain crimping conditions.

[0047] The second negative electrode conductive connector 25 includes a conductive copper ring 251, a second negative electrode connector groove structure 252, and a second negative electrode single-sided connector groove structure 253. The conductive copper ring 251 is disposed between the second positive electrode insulating cylinder 22 and the second negative electrode insulating cylinder 23. One end of each of the four second negative electrode connector groove structures 252 is connected to the conductive copper ring 251, and the other end is connected to four primary negative electrode conductive leads 42. One end of each of the four second negative electrode single-sided connector groove structures 253 is connected to the side of the corresponding conductive copper ring 251 away from the second negative electrode connector groove structure 252, and the other end is connected to the secondary negative electrode conductive leads 52 through the connector cover 7. The connectors are then soldered and fixed under certain pressure conditions.

[0048] See Figure 6 and Figure 7 The third connector 3 includes a third support fixing member 31, an insulating member 32, a third positive conductive connector 33, and a third negative conductive connector 34. The bottom periphery of the third support fixing member 31 is connected to the second-level cold shield cover plate. An insulating member 32 is provided on the third support fixing member 31. One third positive conductive connector 33 passes through the center of the insulating member 32. Four third negative conductive connectors 34 are distributed in a circle around the third positive conductive connector 33 and pass through the insulating member 32. One end of the third positive conductive connector 33 is connected to the secondary positive conductive lead 51, and the other end is connected to the positive terminal of the low-temperature superconducting wire 6 of the magnet coil output. One end of each of the four third negative conductive connectors 34 is connected to the four secondary negative conductive leads 52, and the other end is connected to the negative terminal of the low-temperature superconducting wire 6 of the magnet coil output.

[0049] Furthermore, a fixing bolt is provided on the third support fixing member 31. The fixing bolt passes through the third support fixing member 31 and connects to the insulating member 32, so that the insulating member 32 is stably fixed on the third support fixing member 31.

[0050] In this embodiment, each third positive conductive connector 33 and third negative conductive connector 34 is divided into three sections. Both ends are 70mm long single-sided connector groove structures, which are connected to the positive pole of the secondary positive conductive lead 51 and the low-temperature superconducting wire 6 and the negative pole of the secondary negative conductive lead 52 and the low-temperature superconducting wire 6 respectively through the connector cover 7. They are fixed by soldering under certain pressure conditions, and the middle is a copper block with a square through hole.

[0051] For further details, please refer to [link / reference]. Figure 8The first support fixing member 11, the second support fixing member 21, and the third support fixing member 31 are all support cylinder structures. Each support cylinder structure includes a support cylinder 101 and an insulating sealing ring 102. One end of the support cylinder 101 is provided with a connecting flange, and the end face of the connecting flange is provided with an annular groove. The insulating sealing ring 101 is disposed within the annular groove. In this embodiment, the support cylinder 101 is made of a conventional metal material with high thermal conductivity (such as stainless steel or aluminum alloy).

[0052] The binary coaxial bipolar current lead structure in this invention is modular and can be disassembled and reassembled in stages with low heat leakage. The cross-sectional area of ​​each stage of the conductor can be adjusted according to the maximum operating current of the superconducting magnet, and the length of each stage of the conductor can be adjusted according to the temperature zone height of each stage of the superconducting magnet. Furthermore, since the positive and negative current leads are distributed coaxially in one place, the sealing performance of the superconducting magnet system is improved while the cooling time is reduced. It is particularly suitable for customized superconducting magnets with high-field conduction cooling.

[0053] In addition, the binary coaxial bipolar current lead structure in this invention also brings the following effects:

[0054] 1. The invention achieves a coaxial distribution in one location, which significantly reduces the risk of magnet instability caused by heating of the current leads. At the same time, for high-field superconducting magnets with conduction cooling, the coaxial distribution of the bipolar current leads proposed in this invention can reduce the cooling time of the current leads by the refrigerator without increasing the cooling power.

[0055] 2. This invention eliminates the need for a support structure with conductive leads. The conductive leads are fixed to the corresponding magnet cover plate or cold shield cover plate through current lead connectors at both ends of the leads, which significantly reduces the overall heat leakage of the current leads, lowers the cooling cost, and further enhances the working stability of the superconducting magnet system.

[0056] 3. This invention enables modular installation of current leads in stages, and allows adjustment of the cross-sectional area of ​​each stage of conductors according to the maximum operating current of the superconducting magnet, as well as adjustment of the length of each stage of conductive leads according to the temperature range of each stage of the superconducting magnet. It is particularly suitable for customized superconducting magnet systems applied to cutting-edge research in multiple disciplines.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] The above embodiments are merely examples of implementation methods of the invention. The scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A binary coaxial bipolar current lead structure for high-field superconducting magnets, characterized in that: It includes a first connector, a second connector, a third connector, a primary current lead, and a secondary current lead. One end of the primary current lead is connected to the first connector, and the other end is connected to one end of the secondary current lead through the second connector. The other end of the secondary current lead is connected to the third connector. The first connector is used to connect to a room temperature power supply, and the third connector is used to connect to the low-temperature superconducting wire of the magnet coil output. The first connector includes a first support fixing member, a first positive electrode insulating cylinder, a first negative electrode insulating cylinder, a first positive electrode conductive connector, and a first negative electrode conductive connector. The first support fixing member is provided with the first positive electrode insulating cylinder and the first negative electrode insulating cylinder. The first positive electrode insulating cylinder is coaxially disposed inside the first negative electrode insulating cylinder. The first positive electrode conductive connector is disposed inside the first positive electrode insulating cylinder. The first negative electrode conductive connector is disposed between the first positive electrode insulating cylinder and the first negative electrode insulating cylinder. The first positive electrode conductive connector and the first negative electrode conductive connector are correspondingly connected to the positive and negative electrodes of the primary current lead. The second connector includes a second support fixing member, a second positive electrode insulating cylinder, a second negative electrode insulating cylinder, a second positive electrode conductive connector, and a second negative electrode conductive connector. The second support fixing member is provided with a second positive electrode insulating cylinder and a second negative electrode insulating cylinder. The second positive electrode insulating cylinder is coaxially arranged inside the second negative electrode insulating cylinder. The second positive electrode conductive connector passes through the second positive electrode insulating cylinder. The two ends of the second positive electrode conductive connector are respectively connected to the positive terminals of the primary current lead and the secondary current lead. The second negative electrode conductive connector passes through the gap between the second positive electrode insulating cylinder and the second negative electrode insulating cylinder. The two ends of the second negative electrode conductive connector are respectively connected to the negative terminals of the primary current lead and the secondary current lead. The third connector includes a third support fixing component, an insulating component, a third positive conductive connector, and a third negative conductive connector. An insulating component is provided on the third support fixing component. The third positive conductive connector and the third negative conductive connector pass through the insulating component. The third positive conductive connector and the third negative conductive connector are respectively connected to the positive and negative terminals of the secondary current lead. The first positive electrode conductive connector includes a positive electrode connector rod and a first positive electrode connector groove structure. The positive electrode connector rod is disposed inside the first positive electrode insulating cylinder. One end of the first positive electrode connector groove structure is connected to the positive electrode connector rod, and the other end is connected to the positive electrode of the first-stage current lead. The first negative electrode conductive connector includes a negative electrode connector rod and a first negative electrode connector groove structure. The negative electrode connector rod is disposed between the first positive electrode insulating cylinder and the first negative electrode insulating cylinder. One end of the first negative electrode connector groove structure is connected to the negative electrode connector rod, and the other end is connected to the negative electrode of the first-stage current lead. The second positive electrode conductive connector includes a second positive electrode connector groove structure and a second positive electrode single-sided connector groove structure. The opposite ends of the second positive electrode connector groove structure and the second positive electrode single-sided connector groove structure are disposed in and connected to the second positive electrode insulating cylinder. The end of the second positive electrode connector groove structure away from the second positive electrode insulating cylinder is connected to the positive electrode of the primary current lead. The end of the second positive electrode single-sided connector groove structure away from the second positive electrode insulating cylinder is connected to the positive electrode of the secondary current lead. The second negative electrode conductive connector includes a conductive copper ring, a second negative electrode connector groove structure, and a second negative electrode single-sided connector groove structure. The conductive copper ring is disposed between the second positive electrode insulating cylinder and the second negative electrode insulating cylinder. One end of the second negative electrode connector groove structure is connected to the conductive copper ring, and the other end is connected to the negative electrode of the primary current lead. One end of the second negative electrode single-sided connector groove structure is connected to the conductive copper ring, and the other end is connected to the negative electrode of the secondary current lead.

2. The binary coaxial bipolar current lead structure for a high-field superconducting magnet according to claim 1, characterized in that: Both the second positive conductive connector and the second negative conductive connector are connected to the secondary current lead through connector caps.

3. The binary coaxial bipolar current lead structure for a high-field superconducting magnet according to claim 1, characterized in that: The first, second, and third support fixing components are all support cylinder structures. The support cylinder structure includes a support cylinder and an insulating sealing ring. One end of the support cylinder is provided with a connecting flange. The end face of the connecting flange is provided with an annular groove, and the insulating sealing ring is provided in the annular groove.

4. The binary coaxial bipolar current lead structure for a high-field superconducting magnet according to claim 1, characterized in that: The number of the first positive conductive connector and the second positive conductive connector is 1 each, and the number of the first negative conductive connector and the second negative conductive connector is 4 each.

5. The binary coaxial bipolar current lead structure for a high-field superconducting magnet according to claim 1, characterized in that: The primary current lead includes a primary positive conductive lead and a primary negative conductive lead. The two ends of the primary positive conductive lead are respectively connected to a first positive conductive connector and a second positive conductive connector, and the two ends of the primary negative conductive lead are respectively connected to a first negative conductive connector and a second negative conductive connector.

6. The binary coaxial bipolar current lead structure for a high-field superconducting magnet according to claim 1, characterized in that: The secondary current lead includes a secondary positive conductive lead and a secondary negative conductive lead. The two ends of the secondary positive conductive lead are respectively connected to a second positive conductive connector and a third positive conductive connector, and the two ends of the secondary negative conductive lead are respectively connected to a second negative conductive connector and a third negative conductive connector.

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