Liquid Helium-Free Superconducting Magnet System

Abstract

The liquid helium-free superconducting magnet system of the present invention utilizes a conduction link to realize conduction refrigeration so that the overall temperature of the superconducting magnet is uniform, the temperature difference is extremely small, and the reliability is high; a rapid cooling channel can also be used to connect an external fluid to rapidly cool the superconducting magnet, and the cooling efficiency is high; conduction cooling and rapid cooling are relatively independent, and components that need to be cooled can be cooled at the same time, so that a rapid, stable and reliable cooling effect can be achieved, and only power resources are consumed during the production, testing, and operation of the superconducting magnet, and no helium consumption is required.

Description

Technical Field

[0001] The invention relates to the field of superconducting magnets, in particular to a liquid helium-free superconducting magnet system. Background Art

[0002] Superconducting magnets generate the uniform strong magnetic field required by magnetic resonance systems, but they require extremely low temperature working conditions to meet the requirements of the critical temperature of superconductors. The critical temperature of commercial magnetic resonance imaging superconducting magnets is generally less than 7K. Above this critical temperature, superconducting magnets cannot work normally. In order to generate and maintain the extremely low temperature working conditions required for superconducting magnets, the traditional method is to immerse the superconducting magnet in liquid helium (boiling point 4.2K at one atmosphere of pressure) refrigerant, so as to conduct away the heat radiation from the external environment of the magnet, the conduction heat leakage of the magnet support components, and the ohmic heat of the magnet joint resistance and other parts from the magnet to maintain the extremely low temperature conditions required for the normal operation of the magnet. However, in the process of immersing superconducting magnets in liquid helium, liquid helium will be continuously consumed, so it is necessary to replenish liquid helium for the magnet regularly. The operation process is very cumbersome and requires professional maintenance; in addition, liquid helium is a scarce resource and is very expensive. Moreover, its acquisition is limited to foreign countries (mainly the United States), and the security of resources cannot be guaranteed. In order to overcome the loss of liquid helium during the process of immersing the magnet in liquid helium, a refrigerator is used to condense the volatilized liquid helium and return it to the magnet. This technology is becoming more and more widely used, especially in areas where liquid helium is difficult to supply. However, this technology still requires the use of a large amount of liquid helium as a refrigerant, and a large amount of liquid helium will still be consumed during the quenching, excitation and demagnetization of the magnet. Summary of the invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a liquid helium-free superconducting magnet system to solve the problems in the prior art that a large amount of liquid helium needs to be used as a refrigerant, and a large amount of liquid helium is still consumed during the quenching of the magnet and the excitation and demagnetization processes.

[0004] To achieve the above-mentioned object and other related objects, the present invention provides a liquid helium-free superconducting magnet system, the system comprising: a room temperature vacuum container, a superconducting magnet having a superconducting component, and a refrigeration system for cooling the superconducting magnet; wherein the refrigeration system is arranged in the room temperature vacuum container, and comprises: a radiation shield and a cold shield arranged in sequence from the inside to the outside; a primary heat exchanger and a secondary heat exchanger; a main cold plate arranged in the radiation shield, which is connected to the secondary heat exchanger; at least two fluid pipelines communicating with the primary heat exchanger and the secondary heat exchanger, which have a fluid port that can be connected to the outside of the room temperature vacuum container; and wherein the superconducting magnet placed in the radiation shield can be cooled by one or more conduction links connecting the main cold plate to the superconducting magnet; and / or, the superconducting magnet can be cooled by a rapid cooling channel formed by the primary heat exchanger and the secondary heat exchanger connected to the cooling fluid.

[0005] In one embodiment of the present invention, the types of the conductive links include: a main cold link, which is used to directly connect the main cold plate with one or more superconducting components to directly transfer the cold energy of the main cold plate to the correspondingly connected superconducting components.

[0006] In one embodiment of the present invention, the type of the conduction link also includes: a secondary cold conduction link, which is used to connect the superconducting component connected in the main cold link with one or more other unconnected superconducting components, so as to indirectly transfer the cold energy of the main cold plate to the corresponding connected superconducting components.

[0007] In one embodiment of the present invention, the compensating cold link is used to connect the superconducting component connected in the main cold link with one or more other unconnected superconducting components, so as to indirectly transfer the cold of the main cold plate to the corresponding connected superconducting components.

[0008] In one embodiment of the present invention, the superconducting component further includes: a superconducting switch, which is located on the primary cold link or the secondary cold link.

[0009] In one embodiment of the present invention, the superconducting component includes: a main coil, an auxiliary coil, an inner frame for supporting the main coil, and an outer frame for supporting the auxiliary coil.

[0010] In one embodiment of the present invention, the primary heat exchanger is connected to a cold screen for rapid cooling of the cold screen; the secondary heat exchanger is connected to the inner frame and the outer frame for rapid cooling of the inner frame and the outer frame.

[0011] In one embodiment of the present invention, the fluid pipeline includes: a fluid interface for connecting with cooling fluid and a vacuum interface for sealing the fluid pipeline.

[0012] In one embodiment of the present invention, the fluid pipeline extends from the secondary heat exchanger through the primary heat exchanger toward the outside of the room temperature vacuum container; the fluid pipeline includes: an upper end bellows section corresponding to the primary heat exchanger extending toward the outside of the room temperature vacuum container and a lower end bellows section corresponding to the secondary heat exchanger extending toward the primary heat exchanger.

[0013] In one embodiment of the present invention, the RRR value of the heat-conducting metal used in the main cold link connection is greater than the RRR value of the heat-conducting metal used in the secondary cold link and / or the compensation cold link.

[0014] As described above, the present invention is a liquid helium-free superconducting magnet system, which has the following beneficial effects: the present invention utilizes a conduction link to realize conduction refrigeration so that the overall temperature of the superconducting magnet is uniform, the temperature difference is extremely small, and the reliability is high; a rapid cooling channel can also be used to connect an external fluid to rapidly cool the superconducting magnet with high cooling efficiency; conduction cooling and rapid cooling are relatively independent, and the components that need to be cooled can be cooled at the same time, which can achieve a rapid, stable and reliable cooling effect, and only consumes power resources during the production, testing, and operation of the superconducting magnet, and no helium is required. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of a liquid helium-free superconducting magnet system in one embodiment of the present invention.

[0016] Figure 2 Shown is a schematic diagram of a conductive link in an embodiment of the present invention.

[0017] Figure 3 Shown is a schematic structural diagram of a fluid pipeline in an embodiment of the present invention.

[0018] Figure 4 Shown is a schematic structural diagram of a liquid helium-free superconducting magnet system in one embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present invention. It should be understood that other embodiments may also be used, and that mechanical composition, structural, electrical and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present invention is limited only by the claims of the published patents. The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between an element or feature shown in the figure and another element or feature.

[0021] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a part is said to "include" a certain constituent element, unless otherwise stated, it does not exclude other constituent elements, but means that other constituent elements may be included.

[0022] The terms first, second and third mentioned herein are used to describe various parts, components, regions, layers and / or segments, but are not limited thereto. These terms are only used to distinguish a certain part, component, region, layer or segment from other parts, components, regions, layers or segments. Therefore, the first part, component, region, layer or segment described below may refer to the second part, component, region, layer or segment within the scope of the present invention.

[0023] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Exceptions to this definition will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0024] The present invention provides a liquid helium-free superconducting magnet system, which utilizes a conduction link to realize conduction refrigeration so that the overall temperature of the superconducting magnet is uniform, the temperature difference is extremely small, and the reliability is high; a rapid cooling channel can also be used to connect an external fluid to rapidly cool the superconducting magnet with high cooling efficiency; conduction cooling and rapid cooling are relatively independent, and components that need to be cooled can be cooled at the same time, so that a rapid, stable and reliable cooling effect can be achieved, and only power resources are consumed during the production, testing and operation of the superconducting magnet, and no helium consumption is required.

[0025] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0026] In order to better describe the liquid helium-free superconducting magnet system, a specific embodiment is provided;

[0027] like Figure 1 A schematic structural diagram of a liquid helium-free superconducting magnet system in an embodiment of the present invention is shown.

[0028] The liquid helium-free superconducting magnet system comprises: a room temperature vacuum container 1, a superconducting magnet 2 having superconducting components, and a refrigeration system for cooling the superconducting magnet; wherein the room temperature vacuum container 1 accommodates all components of the superconducting magnet 2 and provides a vacuum environment; the refrigeration system is arranged in the room temperature vacuum container 1, and comprises: a radiation shield 31 and a cold shield 32 arranged in sequence from the inside to the outside; the cold shield 32 is used to reduce radiation heat leakage in the radiation shield 31, and the radiation shield 31 is used to reduce heat radiation from various components of the superconducting magnet 2 to the cold shield 32; the primary heat exchanger 33 and the secondary heat exchanger heat exchanger 34; a main cooling plate 35 arranged in the radiation shield, which is connected to the secondary heat exchanger 34; at least two fluid pipelines 36 connected to the primary heat exchanger 33 and the secondary heat exchanger 34, which have a fluid port that can be connected to the outside of the room temperature vacuum container; and wherein the superconducting magnet 2 placed in the radiation shield can be cooled by one or more conduction links connecting the main cooling plate 35 to the superconducting magnet 2; and / or, the superconducting magnet 2 can be cooled by a rapid cooling channel composed of the primary heat exchanger 33 and the secondary heat exchanger 34 connected to the cooling fluid.

[0029] It should be noted that the conduction cooling using the conduction link and the rapid cooling using the rapid cooling channel are relatively independent. One method can be used for refrigeration, or both methods can be used at the same time to cool the components that need to be cooled. The superconducting magnet 2 and its superconducting components can be set at any position in the radiation shield 31, not limited to Figure 1 Middle position.

[0030] There are several implementation methods for conducting cooling using a conduction link:

[0031] In one embodiment, if Figure 2 As shown, the types of the conductive links include: a main cold link ①, which is used to directly connect the main cold plate with one or more superconducting components to directly transfer the cold energy of the main cold plate to the correspondingly connected superconducting components.

[0032] In one embodiment, if Figure 2 As shown, the types of the conduction link also include: a secondary cold conduction link ②, which is used to start from the end of the main cold link and connect to the components that need to be cooled, that is, to connect the superconducting components connected in the main cold link with one or more other unconnected superconducting components, so as to indirectly transfer the coldness of the main cold plate to the corresponding connected superconducting components.

[0033] In one embodiment, if Figure 2 As shown, the compensating cooling link ③ is used to connect at least two superconducting components connected in the main cooling link to compensate for the situation that the main cooling link fails to achieve the cooling effect, or to connect at least two superconducting components connected in the secondary cooling link to compensate for the situation that the secondary cooling link fails to achieve the cooling effect, so as to balance the temperature difference between the components in the superconducting magnet.

[0034] It should be noted that the number of the primary cooling links, the secondary cooling links and the compensating cooling links may be one or more.

[0035] In one embodiment, various types of cold-conducting links use heat-conducting metals with different RRR values; the RRR value of the heat-conducting metal used in the main cold-conducting link is greater than the RRR value of the heat-conducting metal used in the secondary cold-conducting link and / or the compensation cold-conducting link; specifically, the main cold-conducting link uses a heat-conducting metal with a high RRR value to ensure lossless transmission of cold from the main cold plate, preferably, such as high-purity copper. The secondary cold-conducting link and the compensation cold-conducting link can use a heat-conducting metal with a slightly lower RRR value.

[0036] According to the above embodiments, the present invention provides multiple links such as a primary cooling link, a secondary cooling link, and a compensating cooling link to make the overall temperature of the superconducting magnet uniform, with a very small temperature difference and high reliability.

[0037] There are several implementation methods for rapid cooling using a rapid cooling channel:

[0038] In one embodiment, if Figure 3As shown, the number of the fluid pipelines 30 is at least two, including: at least one inlet fluid pipeline for the inflow of external cooling fluid; at least one outlet fluid pipeline for the outflow of fluid; each fluid pipeline includes: a fluid interface 301 that can be connected to the cooling fluid and a vacuum interface 302 for closing the fluid pipeline.

[0039] When rapid channel cooling is performed, the fluid interface is connected to the external cooling fluid to cool the superconducting magnet using the primary heat exchanger 100 and the secondary heat exchanger 200. When the temperature inside the radiation shield is equal to the external fluid temperature, the fluid interface 301 and the vacuum interface 302 of the inflow fluid pipeline are closed, and the fluid interface 301 of the outflow fluid pipeline is evacuated to the fluid pipeline. When the vacuum degree is less than a certain value, the vacuum interface 302 of the outflow fluid pipeline is closed. When the superconducting magnet needs to be reheated, the refrigerator can be turned off, and the fluid interface 301 and the vacuum interface 302 of the fluid pipeline are opened at the same time, and the room temperature gas is passed into the fluid interface 301 to achieve rapid reheating.

[0040] For example, a fluid pipeline is provided on one side of the inlet end of the primary heat exchanger and the secondary heat exchanger, and a fluid pipeline is provided on one side of the outlet end. The fluid interface of the fluid pipeline on the inlet end is connected to an external liquid nitrogen circuit or a cold helium circuit. Liquid nitrogen or cold helium will enter the primary heat exchanger and the secondary heat exchanger through the fluid pipeline to quickly cool the superconducting magnet. When the temperature of the radiation shield is equal to the external fluid temperature, the fluid interface and the vacuum interface on the inlet end are closed, and the fluid pipeline is evacuated from the fluid interface on the outlet end. When the vacuum degree is less than a certain value (1E-4Pa), the vacuum interface on the other side is closed.

[0041] In one embodiment, if Figure 3 As shown, the fluid pipeline 30 extends from the secondary heat exchanger 200 through the primary heat exchanger 100 toward the outside of the room temperature vacuum container; the fluid pipeline includes: an upper bellows section 303 corresponding to the primary heat exchanger 100 extending toward the outside of the room temperature vacuum container and a lower bellows section 304 corresponding to the secondary heat exchanger 200 extending toward the primary heat exchanger 100; wherein the upper bellows section 303 and the lower bellows section 304 are used to adjust installation errors and reduce structural stress.

[0042] According to the above embodiments, the present invention can rapidly cool the superconducting magnet by using an externally connected fluid, and the cooling speed is fast and the efficiency is high.

[0043] In one embodiment, if Figure 1 As shown, there may be multiple secondary heat exchangers 34 .

[0044] In one embodiment, the fluid pipeline 36 is a thin-walled pipeline made of austenitic stainless steel.

[0045] In one embodiment, the primary heat exchanger 33 and the secondary heat exchanger 34 are made of high thermal conductivity metal, preferably, high purity copper.

[0046] In one embodiment, the radiation protection screen 31 is a 4K radiation screen.

[0047] In one embodiment, the cold shield 32 is located between 300K and 4K to reduce radiation heat leakage in the 4K part.

[0048] In order to better illustrate the liquid helium-free superconducting magnet system, the following embodiments are provided.

[0049] like Figure 4 , which is a schematic structural diagram of a liquid helium-free superconducting magnet system in an embodiment of the present invention.

[0050] The liquid helium-free superconducting magnet system comprises: a room temperature container 1, a superconducting magnet and a refrigeration system; the refrigeration system comprises: a cold shield 2, a radiation shield 3, a main cold plate 4, a primary heat exchanger 6, and a secondary heat exchanger 7; two fluid pipelines 8 are connected to both sides of the primary heat exchanger 6 and the secondary heat exchanger 7, and have a first fluid port 81 and a second fluid port 82 respectively; the main cold plate 4 is arranged in the radiation shield and connected to the secondary heat exchanger 7; the superconducting components of the superconducting magnet comprise: a main coil 51 and a shielding coil 52 for generating a uniform magnetic field, an inner frame 53 for supporting the main coil 51, and an outer frame 54 for supporting the shielding coil 52. The superconducting magnet placed in the radiation shield 3 can be cooled by one or more conduction links formed by connecting the main cold plate 4 and the components of the superconducting magnet; and / or, the superconducting magnet can be cooled by a rapid cooling channel formed by the primary heat exchanger 6 and the secondary heat exchanger 7 connected to the cooling fluid.

[0051] It should be noted that there are one or more main coils 51 and shielding coils 52 , and each main coil 51 can be supported by one inner frame 53 or multiple inner frames 53 ; each shielding coil 52 can be supported by one outer frame 54 or multiple outer frames 54 . Figure 4 This is only an embodiment and is not limited to the number shown in this figure. The superconducting component is not limited to the above components, but can also include any superconducting component, which is not limited.

[0052] In one embodiment, the superconducting component further includes: a superconducting switch 55 and / or one or more 4K components 56 .

[0053] In one embodiment, the conductive link includes: at least one main cold link 91, which is used to directly connect the main cold plate 4 with one or more superconducting components to directly transfer the cold of the main cold plate to the corresponding connected superconducting components. Preferably, the inner frame 53, the main coil 51, the outer frame 54 and the shielding coil 52 are all on the main cold link.

[0054] In one embodiment, the superconducting switch 55 and / or one or more 4K components 56 are on the dominant cold link.

[0055] In one embodiment, the conductive link further includes: at least one secondary cold conductive link 92, which is used to connect the superconducting component connected in the main cold link 90 with one or more other unconnected superconducting components, so as to indirectly transfer the coldness of the main cold plate 4 to the corresponding connected superconducting components; for example, Figure 4 As shown, the inner skeleton 53 on the dominant cold link is connected to the superconducting switch 55 not on the dominant cold link to form a secondary cold link.

[0056] In one embodiment, the conductive link further includes: a compensating cooling link 93, which is used to connect at least two superconducting components connected in the primary cooling link 91 or the secondary cooling link to balance the temperature difference between the components in the superconducting magnet. Figure 4 , if both 4K components 56 are on the main cold link, the two 4K components 56 are connected to form a compensating cold link.

[0057] In one embodiment, the primary heat exchanger 6 is connected to the cold screen 2, and is used to pass cooling fluid through the fluid pipeline on one side to quickly cool the cold screen; the secondary heat exchanger 6 is connected to the inner skeleton 53 and the outer skeleton 54, and is used to pass cooling fluid through the fluid pipeline on one side to quickly cool the inner skeleton 53 and the outer skeleton 54, so as to cool the main coil 51 and the shielding coil 52.

[0058] The liquid helium-free superconducting magnet system uses a conduction link for conduction cooling and a rapid cooling channel for rapid cooling in a relatively independent manner. One method can be used for refrigeration, or both methods can be used simultaneously to cool the components that need to be cooled; therefore, the following cooling processes can be used:

[0059] The first method: using conduction cooling and rapid cooling at the same time for cooling:

[0060] 1) Turn on the refrigerator, and the cold energy of the secondary heat exchanger 7 will cool down the components through the main cooling link, the secondary cooling link and the final cooling link;

[0061] 2) At the same time, the fluid interface of the fluid pipeline on one side is connected to an external liquid nitrogen circuit or a cold helium circuit. The liquid nitrogen or cold helium will enter the primary heat exchanger 6 through the fluid pipeline to quickly cool the cold screen 2, and enter the secondary heat exchanger 7 to quickly cool the inner skeleton 53 and the outer skeleton 54. The inner skeleton 53 and the outer skeleton 54 can transfer cold energy through the secondary cold conduction link;

[0062] 3) When the temperature of the radiation shield 3 is equal to the external fluid temperature, close the fluid interface and vacuum interface on one side, and evacuate the fluid pipeline from the fluid interface on the other side. When the vacuum degree is less than a certain value (1E-4Pa), close the vacuum interface on the other side.

[0063] When rewarming is required, the refrigerator can be turned off, and the fluid interface and vacuum interface can be opened at the same time, and room temperature gas can be passed into the fluid interface to achieve rapid rewarming.

[0064] The second type: using only conduction cooling for cooling;

[0065] When the refrigerator is turned on, the cold energy of the secondary heat exchanger 7 will cool down various components through the main cooling link, the secondary cooling link and the final cooling link.

[0066] The third type: only use rapid cooling method for refrigeration;

[0067] The fluid interface of the fluid pipeline on one side is connected to an external liquid nitrogen circuit or a cold helium circuit. The liquid nitrogen or cold helium will enter the primary heat exchanger 6 through the fluid pipeline to quickly cool the cold screen 2, and enter the secondary heat exchanger 7 to quickly cool the inner skeleton 53 and the outer skeleton 54.

[0068] The above three methods all rely on refrigerators to directly cool the superconducting coils, so that the superconducting coils are maintained in a low-temperature superconducting state, and only consume electricity resources during the production, testing, and operation of superconducting magnets, without consuming helium. The cooling method in liquid helium-free superconducting technology relies on high thermal conductivity metals (such as copper) to directly connect the refrigerator and the superconducting coils to cool the superconducting magnets, achieving no liquid helium consumption.

[0069] In summary, the liquid helium-free superconducting magnet system of the present invention uses a conduction link to realize conduction refrigeration so that the overall temperature of the superconducting magnet is uniform, the temperature difference is extremely small, and the reliability is high; the rapid cooling channel can also be used to connect an external fluid to quickly cool the superconducting magnet with high cooling efficiency; the conduction cooling and the rapid cooling are relatively independent, and the components that need to be cooled can be cooled at the same time, which can achieve a fast, stable and reliable cooling effect, and only consumes power resources during the production, testing, and operation of the superconducting magnet, and does not need to consume helium. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0070] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A liquid helium-free superconducting magnet system, characterized in that: The system comprises: a room temperature vacuum container, a superconducting magnet having a superconducting component, and a refrigeration system for cooling the superconducting magnet; Wherein, the refrigeration system is arranged in the room temperature vacuum container, and comprises: Radiation protection screens and cold screens are arranged from inside to outside; A primary heat exchanger and a secondary heat exchanger; a main cold plate arranged in the radiation shield, connected to the secondary heat exchanger; At least two fluid pipelines connected to the primary heat exchanger and the secondary heat exchanger, each having a fluid port that can be connected to the outside of the room temperature vacuum container; And wherein the superconducting magnet placed in the radiation shield is cooled by a plurality of conduction links connecting the main cooling plate to the superconducting magnet; the superconducting magnet is cooled by a rapid cooling channel consisting of a primary heat exchanger and a secondary heat exchanger connected to a cooling fluid; The types of conductive links include: A main cold link, used to directly connect the main cold plate with one or more superconducting components to directly transfer the cold energy of the main cold plate to the corresponding connected superconducting components; A secondary cooling link is used to start from the end of the main cooling link and connect to the component that needs to be cooled, so as to indirectly transfer the cooling energy of the main cooling plate to the corresponding connected superconducting component; The compensating cooling link is used to connect at least two superconducting components connected in the main cooling link to compensate for the situation that the main cooling link fails to achieve the cooling effect, or to connect at least two superconducting components connected in the secondary cooling link to compensate for the situation that the secondary cooling link fails to achieve the cooling effect, so as to balance the temperature difference between the components in the superconducting magnet.

2. The liquid helium-free superconducting magnet system according to claim 1, characterized in that: The superconducting component further includes: a superconducting switch located on the primary cold link or the secondary cold link.

3. The liquid helium-free superconducting magnet system according to claim 1, characterized in that: The superconducting component comprises: a main coil, an auxiliary coil, an inner frame for supporting the main coil, and an outer frame for supporting the auxiliary coil.

4. The liquid helium-free superconducting magnet system according to claim 3, characterized in that: The primary heat exchanger is connected to the cold screen for rapid cooling of the cold screen; the secondary heat exchanger is connected to the inner skeleton and the outer skeleton for rapid cooling of the inner skeleton and the outer skeleton.

5. The liquid helium-free superconducting magnet system according to claim 1, characterized in that: The fluid pipeline comprises: a fluid interface for connecting a cooling fluid and a vacuum interface for closing the fluid pipeline.

6. The liquid helium-free superconducting magnet system according to claim 1 or 5, characterized in that: The fluid pipeline extends from the secondary heat exchanger through the primary heat exchanger toward the outside of the room temperature vacuum container; the fluid pipeline includes: an upper end bellows section corresponding to the primary heat exchanger extending toward the outside of the room temperature vacuum container and a lower end bellows section corresponding to extending from the secondary heat exchanger toward the primary heat exchanger.

7. The liquid helium-free superconducting magnet system according to claim 1, characterized in that: The RRR value of the heat-conducting metal used in the main cold link connection is greater than the RRR value of the heat-conducting metal used in the secondary cold link and / or the compensation cold link.

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