High-coaxiality room temperature bore structure for superconducting magnet cryostats

Abstract

The present application relates to the technical fields of cryogenic engineering and superconducting magnet, and particularly relates to a high-coaxiality room-temperature hole structure for a superconducting magnet cryostat. The room-temperature hole structure comprises: a cryostat dewar shell, including a shell with a cylindrical cavity; a room-temperature hole tube, penetrating through two ends of the cryostat dewar shell along a central axis of the shell; a superconducting solenoid magnet, located inside the cryostat dewar shell, the superconducting solenoid magnet movably sleeving the room-temperature hole tube; two-dimensional plane fine adjustment assemblies, used for adjusting the relative positions of the superconducting solenoid magnet and the room-temperature hole tube to realize the coincidence of the central axes of the two; wherein, the two two-dimensional plane fine adjustment assemblies are symmetrically arranged relative to the superconducting solenoid magnet and are respectively mounted at two ends of the superconducting solenoid magnet. In the present application, the room-temperature hole tube and the superconducting solenoid magnet are connected together through the two-dimensional plane fine adjustment assemblies, and the coaxiality between the two can be improved.

Description

Technical Field

[0001] This invention relates to the fields of cryogenic engineering and superconducting magnet technology, and in particular to a high coaxiality room temperature hole structure for a cryogenic thermostat of a superconducting magnet. Background Technology

[0002] During the magnetic measurement of superconducting magnets, the magnets need to be precisely installed and kept in a thermostat for low-temperature performance testing.

[0003] Currently, in traditional magnet cryostats, the room temperature aperture and the superconducting magnet are both mounted using the cryostat shell as the mounting reference, and the two are completely isolated. Furthermore, the cryostat shell deforms due to factors such as vacuuming and gravity, and the internal cold mass component support and other structures shrink and deform due to low temperatures, causing changes in the relative positions of the room temperature aperture and the superconducting magnet. Therefore, it is difficult to ensure that the magnetic field center of a magnet cryostat assembled under room temperature conditions is aligned with the mechanical center of the magnet.

[0004] Therefore, there is an urgent need for a room-temperature porous structure that can achieve high-precision collimation while effectively reducing heat conduction. Summary of the Invention

[0005] This invention aims to solve the technical problems existing in related technologies. To this end, this invention proposes a high coaxiality room temperature aperture structure for a cryogenic thermostat of a superconducting magnet, in order to solve the problem that the superconducting magnet is prone to axial displacement due to the shrinkage of the thermostat structure under low temperature conditions, which leads to magnetic field measurement deviation. This invention aligns the central axis of the room temperature aperture with the mechanical center of the superconducting magnet, improves the coaxiality between the central axis of the room temperature aperture and the mechanical center of the magnet, and reduces heat leakage from the room temperature aperture.

[0006] This invention provides a high coaxiality room temperature aperture structure for a superconducting magnet cryostat, comprising: Thermostat Dewar housing, including a housing with a cylindrical cavity; A room temperature perforated tube extends through both ends of the thermostat Dewar outer shell along the central axis of the housing; A superconducting solenoid magnet is located inside the Dewar shell of the thermostat, and the superconducting solenoid magnet is movably sleeved on the room temperature orifice tube; A two-dimensional planar fine-tuning component is used to adjust the relative position of the superconducting solenoid magnet and the room-temperature porous tube to achieve the coincidence of their central axes; The two two-dimensional planar fine-tuning components are arranged symmetrically relative to the superconducting solenoid magnet and are respectively installed at both ends of the superconducting solenoid magnet.

[0007] According to the present invention, a high coaxiality room temperature aperture structure for a superconducting magnet cryostat is provided, wherein the two-dimensional planar fine-tuning component includes: An adjusting flange base is provided with a first through hole, and the adjusting flange base is connected to the end face of the superconducting solenoid magnet; The longitudinal adjustment flange is equipped with a second through hole; The lateral adjustment flange is equipped with a third through hole; The adjusting flange base, the longitudinal adjusting flange and the transverse adjusting flange are stacked sequentially, and the room temperature orifice tube passes through the first through hole, the second through hole and the third through hole in sequence; The room temperature orifice tube is transitionally fitted with the third through hole. The diameters of the first through hole and the second through hole are both larger than the diameter of the third through hole, so that the longitudinal adjusting flange and the transverse adjusting flange can move relative to the adjusting flange base along the longitudinal and transverse directions, respectively.

[0008] According to the present invention, a high coaxiality room temperature bore structure for a superconducting magnet cryostat is provided, wherein the adjusting flange base comprises: A limiting plate is provided on the outer periphery of the adjusting flange base to limit the movement distance of the longitudinal adjusting flange or the transverse adjusting flange relative to the adjusting flange base; The first pin extends along a direction perpendicular to the surface of the adjusting flange base plate; The longitudinal adjusting flange includes: A first limiting hole is provided on the plate surface of the longitudinal adjusting flange and extends longitudinally; a first pin passes through the first limiting hole to limit the direction of movement of the longitudinal adjusting flange relative to the adjusting flange base.

[0009] According to the present invention, a high coaxiality room temperature bore structure for a superconducting magnet cryostat is provided, wherein the longitudinal adjusting flange further includes: The second pin extends along a direction perpendicular to the longitudinal adjusting flange surface; The lateral adjusting flange includes: The second limiting hole is provided on the plate surface of the transverse adjusting flange and extends transversely; the second pin passes through the second limiting hole to limit the direction of movement of the transverse adjusting flange relative to the adjusting flange base.

[0010] According to the present invention, a high coaxiality room temperature aperture structure for a superconducting magnet cryostat is provided, wherein the two-dimensional planar fine-tuning component further includes: A thin-walled cylinder, made of G-10 material, is positioned between the end face of the superconducting solenoid magnet and the adjusting flange base to reduce heat conduction.

[0011] According to the present invention, a high coaxiality room temperature aperture structure for a superconducting magnet cryostat is provided, wherein the two-dimensional planar fine-tuning component further includes: A magnet end face fixing flange is disposed between the end face of the superconducting solenoid magnet and the thin-walled cylinder.

[0012] The high coaxiality room temperature hole structure for a superconducting magnet cryotherm provided by the present invention further includes a bellows assembly for compensating for low temperature shrinkage deformation to maintain vacuum sealing. One end of the bellows assembly is connected to the room temperature orifice tube, and the other end of the bellows assembly is connected to the thermostat Dewar housing.

[0013] According to the present invention, a high coaxiality room temperature bore structure for a superconducting magnet cryostat is provided, wherein the bellows assembly comprises: The thermostat end cap sealing flange is installed on the end face of the thermostat Dewar housing; A room temperature orifice sealing flange is fitted onto the end of the room temperature orifice that extends out of the thermostat Dewar housing; A welded bellows is installed between the thermostat end cover sealing flange and the room temperature orifice sealing flange.

[0014] According to the present invention, a high coaxiality room temperature aperture structure for a superconducting magnet cryostat is provided, wherein the cryostat Dewar shell further includes: An interface module is mounted on the outer periphery of the housing and extends radially along the housing.

[0015] According to the present invention, a high coaxiality room temperature aperture structure for a superconducting magnet cryostat is provided, wherein the cryostat Dewar shell further includes: Post support is located inside the thermostat Dewar housing; Adjust the base plate and seal it onto the Post support; A superconducting magnet support, one end of which is connected to the adjusting base plate, and the other end of which is connected to the superconducting solenoid magnet.

[0016] The above-described one or more technical solutions of this invention have at least one of the following technical effects: By connecting the room temperature orifice tube and the superconducting solenoid magnet together using a two-dimensional planar fine-tuning component, the central axis of the room temperature orifice tube can be precisely aligned with the central axis of the superconducting solenoid magnet, avoiding axial offset caused by cooling and contraction, ensuring high coaxiality between the two and improving the accuracy of magnetic field measurement.

[0017] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions as described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or will be learned through the practice of the present invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of a high coaxiality room temperature hole structure for a superconducting magnet cryogenic thermostat provided in an embodiment of the present invention.

[0020] Figure 2 This is a partial cross-sectional view of the thermostat Dewar shell provided in an embodiment of the present invention.

[0021] Figure 3 This is an assembly structure diagram of the two-dimensional planar fine-tuning component, room temperature porous tube, superconducting solenoid magnet, and bellows component provided in the embodiments of the present invention.

[0022] Figure 4 This is an assembly structure diagram of the two-dimensional planar fine-tuning component, the room temperature perforated tube, and the bellows component provided in the embodiments of the present invention.

[0023] Figure 5 An exploded view of the two-dimensional planar fine-tuning component provided in an embodiment of the present invention.

[0024] Figure 6 This is an exploded view of the bellows assembly provided in an embodiment of the present invention.

[0025] Figure label: 10. Thermostat Dewar shell; 11. Shell; 12. Interface module; 13. Post support; 14. Thermostat end cap; 15. Superconducting magnet bracket; 20. Room temperature orifice tube; 30. Superconducting solenoid magnet; 400. Two-dimensional planar fine-tuning assembly; 410. Adjusting flange base; 411. Limiting plate; 412. First pin; 420. Longitudinal adjusting flange; 421. First limiting hole; 422. Second pin; 430. Lateral adjusting flange; 431. Second limiting hole; 440. Thin-walled cylinder; 450. Magnet end face fixing flange; 50. Bellows assembly; 51. Thermostat end cap sealing flange; 52. Room temperature orifice tube sealing flange; 53. Welded bellows. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0027] In an embodiment of the present invention, a high coaxiality room temperature aperture structure for a superconducting magnet cryogenic thermostat is described. The room temperature aperture structure mainly includes a thermostat Dewar shell 10, a room temperature aperture tube 20, a superconducting solenoid magnet 30, and a two-dimensional planar fine-tuning component 400.

[0028] like Figures 1 to 3 As shown, the thermostat Dewar housing 10 includes a shell 11 with a cylindrical cavity. A room temperature orifice 20 extends through both ends of the thermostat Dewar housing 10 along the central axis of the shell 11.

[0029] The superconducting solenoid magnet 30 is located inside the thermostat Dewar housing 10. The room temperature orifice tube 20 is fitted inside the central beam hole of the superconducting solenoid magnet 30.

[0030] The two-dimensional planar fine-tuning component 400 is used to adjust the relative position of the superconducting solenoid magnet 30 and the room temperature porous tube 20 so that their central axes coincide.

[0031] The two two-dimensional planar fine-tuning components 400 are symmetrically arranged relative to the superconducting solenoid magnet 30 and are respectively installed at both ends of the superconducting solenoid magnet 30.

[0032] Specifically, the housing 11 is a cylindrical cavity structure used to house the superconducting solenoid magnet 30, the room temperature orifice tube 20, and the two-dimensional planar fine-tuning component 400, providing installation reference and protection for each component and maintaining a vacuum environment.

[0033] The room temperature orifice tube 20 is made of 316L stainless steel. The straightness error of the room temperature orifice tube 20 is less than or equal to ±0.01 mm / m. It serves as a geometric transfer carrier for external collimation, ensuring that the sample, probe, or optical path can pass through the central magnetic field region of the superconducting solenoid magnet 30 along the ideal axis. The superconducting solenoid magnet 30 is a superconducting coil assembly for testing; its central through-hole is coaxially arranged with the room temperature orifice tube 20 and uses a movable sleeve method.

[0034] Two-dimensional plane fine-tuning components 400 are arranged in pairs at both ends of the superconducting solenoid magnet 30 to precisely adjust the offset between the room temperature orifice tube 20 and the superconducting solenoid magnet 30 in a two-dimensional plane, with an adjustment range of ±5mm. By setting the two-dimensional plane fine-tuning components 400, the axis of the room temperature orifice tube 20 can be made to coincide with the mechanical central axis of the superconducting solenoid magnet 30, ensuring that the coaxiality error between the two is less than or equal to 0.1mm.

[0035] In this embodiment, the room temperature orifice tube 20 can be directly positioned in conjunction with the superconducting solenoid magnet 30 through the two-dimensional planar fine-tuning component 400, thereby eliminating the axial offset caused by the cooling and shrinkage of the room temperature orifice structure and significantly improving the accuracy of magnetic field measurement.

[0036] Based on the above embodiments, the specific structure of the two-dimensional planar fine-tuning component 400 is further defined.

[0037] like Figures 3 to 5 As shown, the two-dimensional planar fine-tuning component 400 mainly includes an adjusting flange base 410, a longitudinal adjusting flange 420, and a transverse adjusting flange 430.

[0038] The adjusting flange base 410 is provided with a first through hole. The adjusting flange base 410 is connected to the end face of the superconducting solenoid magnet 30.

[0039] The longitudinal adjusting flange 420 is provided with a second through hole. The transverse adjusting flange 430 is provided with a third through hole.

[0040] The adjusting flange base 410, the longitudinal adjusting flange 420, and the transverse adjusting flange 430 are stacked sequentially. The room temperature orifice 20 passes through the first through hole, the second through hole, and the third through hole in sequence.

[0041] The room temperature orifice 20 is transitionally fitted with the third through hole. The diameters of the first through hole and the second through hole are both larger than the diameter of the third through hole, so that the longitudinal adjusting flange 420 and the transverse adjusting flange 430 can move relative to the adjusting flange base 410 along the longitudinal and transverse directions, respectively.

[0042] Specifically, the adjusting flange base 410 is bolted to the end face of the superconducting solenoid magnet 30, serving as the mounting reference for the two-dimensional planar fine-tuning assembly 400. The longitudinal adjusting flange 420 is stacked on one side of the adjusting flange base 410 and can be adjusted longitudinally (…). Figure 5 (The vertical direction is represented by the center) allows for a small linear displacement. The transverse adjusting flange 430 is stacked on one side of the longitudinal adjusting flange 420, and can move along the transverse direction (the vertical direction is represented by the center). Figure 5 Make a small linear displacement (in the horizontal direction).

[0043] Furthermore, the room temperature orifice tube 20 and the third through hole of the transverse adjustment flange 430 adopt a transition fit to ensure positioning accuracy and facilitate assembly. The diameters of the first and second through holes are both larger than the diameter of the third through hole, which provides clearance for longitudinal and transverse adjustments and avoids interference between the room temperature orifice tube 20 and the adjustment flange base 410 and the longitudinal adjustment flange 420 during the adjustment process.

[0044] When assembling the two-dimensional planar fine-tuning component 400, first fix the adjusting flange base 410 to the end face of the superconducting solenoid magnet 30, then assemble the longitudinal adjusting flange 420 and the transverse adjusting flange 430 in sequence. Next, pass the room temperature orifice tube 20 through the first through hole, the second through hole, and the third through hole in sequence. Then, use a laser tracker to monitor the coaxiality of the room temperature orifice tube 20 and the superconducting solenoid magnet 30. By driving the longitudinal adjusting flange 420 and the transverse adjusting flange 430, independently perform longitudinal and transverse fine-tuning of the room temperature orifice tube 20 until their axes coincide, then lock and fix it.

[0045] In this embodiment, by setting a two-dimensional planar fine-tuning component 400, it is possible to ensure the precise positioning between the room temperature orifice tube 20 and the superconducting solenoid magnet 30, and to make the adjustment process smooth and convenient, thus meeting the stringent requirements of coaxiality for superconducting magnet magnetization.

[0046] Furthermore, the adjusting flange base 410 includes a limiting plate 411 and a first pin 412.

[0047] A limiting plate 411 is disposed on the outer peripheral edge of the adjusting flange base 410 and is used to limit the movement distance of the longitudinal adjusting flange 420 or the transverse adjusting flange 430 relative to the adjusting flange base 410. A first pin 412 extends along a direction perpendicular to the surface of the adjusting flange base 410.

[0048] The longitudinal adjusting flange 420 includes a first limiting hole 421 and a second pin 422. The first limiting hole 421 is disposed on the plate surface of the longitudinal adjusting flange 420 and extends longitudinally. The second pin 422 extends in a direction perpendicular to the plate surface of the longitudinal adjusting flange 420.

[0049] The lateral adjusting flange 430 includes a second limiting hole 431. The second limiting hole 431 is disposed on the plate surface of the lateral adjusting flange 430 and extends laterally.

[0050] The first pin 412 passes through the first limiting hole 421 and is used to limit the movement direction of the longitudinal adjusting flange 420 relative to the adjusting flange base 410. The second pin 422 passes through the second limiting hole 431 and is used to limit the movement direction of the transverse adjusting flange 430 relative to the adjusting flange base 410.

[0051] Specifically, the first pin 412 and the longitudinally extending first limiting hole 421 form a longitudinal guide pair, ensuring that the longitudinal adjusting flange 420 moves only longitudinally and does not deflect or shift. The second pin 422 and the laterally extending second limiting hole 431 form a lateral guide pair, ensuring that the lateral adjusting flange 430 moves only laterally. The limiting plate 411 is disposed on the outer periphery of the adjusting flange base 410 to mechanically limit the maximum displacement of the longitudinal adjusting flange 420 and the lateral adjusting flange 430, preventing structural interference or damage caused by exceeding the stroke.

[0052] Preferably, the mating surfaces and guide surfaces between the adjusting flange base 410, the longitudinal adjusting flange 420 and the transverse adjusting flange 430 are precision ground until the surface roughness Ra is less than or equal to 0.8μm, so as to ensure guiding accuracy and smooth movement.

[0053] like Figure 5 As shown, the limiting plate 411 is also provided with threaded holes, which can be used to fix the three-layer flange from the outer periphery after the position of the room temperature orifice tube 20 is adjusted to the correct position, so as to form a rigid whole and avoid loosening and displacement during low temperature operation.

[0054] Furthermore, in order to reduce heat conduction leakage from the room temperature flange to the low-temperature superconducting magnet, the two-dimensional planar fine-tuning assembly 400 also includes a thin-walled cylinder 440.

[0055] The thin-walled cylinder 440 is made of G-10, a material with low thermal conductivity. The thin-walled cylinder 440 is positioned between the end face of the superconducting solenoid magnet 30 and the adjusting flange base 410 to reduce heat conduction.

[0056] The thickness of the thin-walled cylinder 440 is set between 2 mm and 3 mm. While ensuring rigidity and support stability, the thermally conductive cross-sectional area is minimized as much as possible to further reduce heat leakage.

[0057] Furthermore, the two-dimensional planar fine-tuning assembly 400 also includes a magnet end face fixing flange 450. The magnet end face fixing flange 450 is disposed between the end face of the superconducting solenoid magnet 30 and the thin-walled cylinder 440.

[0058] The magnet end face fixing flange 450 serves as a transition connector. On the one hand, it precisely fits with the end face of the superconducting solenoid magnet 30 to ensure coaxial reference transmission; on the other hand, it connects with the thin-walled cylinder 440 to form a heat-insulating transition section, blocking the heat flow conduction path.

[0059] Based on the above embodiments, another embodiment of the present invention introduces a high coaxiality room temperature hole structure for a superconducting magnet cryostat.

[0060] like Figure 1 , Figure 3 and Figure 6 As shown, in order to compensate for low-temperature shrinkage deformation and maintain vacuum sealing, the room-temperature perforation structure also includes a bellows assembly 50.

[0061] One end of the bellows assembly 50 is connected to the room temperature orifice tube 20, and the other end of the bellows assembly 50 is connected to the thermostat Dewar housing 10. The bellows assembly 50 includes a thermostat end cap sealing flange 51, a room temperature orifice sealing flange 52, and a welded bellows 53.

[0062] The thermostat end cap sealing flange 51 is installed on the end face of the thermostat Dewar housing 10. The room temperature orifice sealing flange 52 is sleeved on the end of the room temperature orifice 20 that extends out of the thermostat Dewar housing 10. A welded bellows 53 is disposed between the thermostat end cap sealing flange 51 and the room temperature orifice sealing flange 52.

[0063] The welded bellows 53 is made of 316L stainless steel and has the ability to undergo combined deformation of axial expansion, radial deflection and angular deflection. It can effectively absorb the thermal shrinkage difference between the room temperature orifice 20, the thermostat Dewar shell 10 and the flange structure under low temperature environment, and avoid stress concentration and sealing failure caused by rigid connection.

[0064] The thermostat end cover sealing flange 51 and the room temperature orifice sealing flange 52 adopt O-ring sealing and fillet weld sealing structures respectively. The leakage rate detected by helium mass spectrometer is less than or equal to 1×10⁻⁶. -9 Pa·m 3 / s, meeting the requirements for ultra-high vacuum sealing.

[0065] During assembly, the thermostat end cap sealing flange 51 is fastened to the end cap of the thermostat Dewar shell 10, the room temperature orifice sealing flange 52 is sleeved and fixed to the room temperature orifice 20, and the welded bellows 53 is naturally in a free state. During the cooling process, the bellows adapts to the temperature difference and expands and contracts accordingly, continuously compensating for the deformation difference and always maintaining the integrity of the vacuum chamber seal.

[0066] Furthermore, the thermostat Dewar housing 10 also includes an interface module 12.

[0067] The interface module 12 is mounted on the outer periphery of the housing 11, and extends radially along the housing 11. This avoids occupying the internal adjustment space of the magnetic adjustment base and prevents interference with the two-dimensional plane fine-tuning assembly 400.

[0068] Furthermore, the thermostat Dewar housing 10 also includes a Post support 13, an adjustment base plate 14, and a superconducting magnet support 15.

[0069] Post support 13 is located inside the thermostat Dewar housing 10. Adjustment base plate 14 is sealed and mounted on post support 13. One end of superconducting magnet bracket 15 is connected to adjustment base plate 14, and the other end of superconducting magnet bracket 15 is connected to superconducting solenoid magnet 30.

[0070] The thermostat Dewar shell 10 is a vacuum-sealed cavity that provides a low-temperature vacuum environment for the superconducting solenoid magnet 30. The post support 13 is arranged below the superconducting solenoid magnet 30, forming a multi-point support system together with the superconducting magnet bracket 15 to improve the stability of the system.

[0071] The following explanation uses the superconducting solenoid magnet 30 test as an example: The two-dimensional planar fine-tuning assembly 400 is mounted on both end faces of the superconducting solenoid magnet 30. Subsequently, the room temperature orifice tube 20 is passed through the third through hole on the transverse adjustment flange 430.

[0072] Using a high-precision laser tracker as a measuring tool, the longitudinal adjusting flange 420 and the transverse adjusting flange 430 on the two-dimensional plane fine-tuning component 400 are adjusted precisely to make the axis of the superconducting solenoid magnet 30 coincide with the axis of the room temperature orifice tube 20. After the adjustment is completed, the position of the room temperature orifice is locked by installing bolts on the limiting plate 411 of the adjusting flange base 410.

[0073] The coaxially calibrated superconducting solenoid magnet 30 and room temperature orifice tube 20 are mounted as a single unit onto the superconducting magnet bracket 15, and the superconducting magnet bracket 15 is fixed inside the thermostat Dewar housing 10.

[0074] Adjust the position of the thermostat Dewar shell 10 to ensure that the axes of the superconducting solenoid magnet 30, the room temperature orifice tube 20, and the thermostat shell are coaxial.

[0075] After completing the coaxial adjustment described above, fit the bellows assembly 50 onto the room temperature orifice tube 20, and install the thermostat end cap sealing flange 51 onto the end cap of the thermostat Dewar housing. Finally, install the room temperature orifice tube sealing flange 52 to complete the overall sealing assembly.

[0076] The assembled thermostat is evacuated and the cooling process begins. At the same time, room temperature nitrogen is continuously blown in from one side of the room temperature orifice tube 20 to prevent frost or condensation from forming on the inner wall of the room temperature orifice tube 20 during cooling and testing.

[0077] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0078] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0079] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0080] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms are not limited to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high coaxiality room temperature aperture structure for a superconducting magnet cryostat, characterized in that, include: The thermostat Dewar housing (10) includes a housing (11) with a cylindrical cavity. A room temperature perforated tube (20) extends through both ends of the thermostat Dewar shell (10) along the central axis of the shell (11); A superconducting solenoid magnet (30) is located inside the thermostat Dewar shell (10), and the superconducting solenoid magnet (30) is movably sleeved on the room temperature orifice tube (20); A two-dimensional planar fine-tuning component (400) is used to adjust the relative position of the superconducting solenoid magnet (30) and the room temperature porous tube (20) to make their central axes coincide. The two two-dimensional planar fine-tuning components (400) are symmetrically arranged relative to the superconducting solenoid magnet (30) and are respectively installed at both ends of the superconducting solenoid magnet (30).

2. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 1, characterized in that, The two-dimensional planar fine-tuning component (400) includes: The adjusting flange base (410) is provided with a first through hole, and the adjusting flange base (410) is connected to the end face of the superconducting solenoid magnet (30); The longitudinal adjusting flange (420) is provided with a second through hole; The transverse adjusting flange (430) is provided with a third through hole; The adjusting flange base (410), the longitudinal adjusting flange (420) and the transverse adjusting flange (430) are stacked sequentially, and the room temperature orifice tube (20) passes through the first through hole, the second through hole and the third through hole in sequence; The room temperature orifice (20) is transitionally fitted with the third through hole. The diameters of the first through hole and the second through hole are both larger than the diameter of the third through hole, so that the longitudinal adjusting flange (420) and the transverse adjusting flange (430) can move relative to the adjusting flange base (410) along the longitudinal and transverse directions, respectively.

3. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 2, characterized in that, The adjusting flange base (410) includes: A limiting plate (411) is provided on the outer periphery of the adjusting flange base (410) to limit the movement distance of the longitudinal adjusting flange (420) or the transverse adjusting flange (430) relative to the adjusting flange base (410); The first pin (412) extends along a direction perpendicular to the surface of the adjusting flange base (410); The longitudinal adjusting flange (420) includes: The first limiting hole (421) is provided on the plate surface of the longitudinal adjusting flange (420) and extends longitudinally; the first pin (412) passes through the first limiting hole (421) and is used to limit the direction of movement of the longitudinal adjusting flange (420) relative to the adjusting flange base (410).

4. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 3, characterized in that, The longitudinal adjusting flange (420) also includes: The second pin (422) extends along a direction perpendicular to the surface of the longitudinal adjusting flange (420); The lateral adjusting flange (430) includes: The second limiting hole (431) is provided on the plate surface of the transverse adjusting flange (430) and extends transversely; the second pin (422) passes through the second limiting hole (431) and is used to limit the direction of movement of the transverse adjusting flange (430) relative to the adjusting flange base (410).

5. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to any one of claims 2 to 4, characterized in that, The two-dimensional planar fine-tuning component (400) also includes: A thin-walled cylinder (440) is made of G-10 material. The thin-walled cylinder (440) is disposed between the end face of the superconducting solenoid magnet (30) and the adjusting flange base (410) to reduce heat conduction.

6. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 5, characterized in that, The two-dimensional planar fine-tuning component (400) also includes: A magnet end face fixing flange (450) is disposed between the end face of the superconducting solenoid magnet (30) and the thin-walled cylinder (440).

7. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to any one of claims 1 to 4, characterized in that, It also includes a bellows assembly (50) for compensating for low-temperature shrinkage deformation to maintain vacuum sealing; One end of the bellows assembly (50) is connected to the room temperature orifice tube (20), and the other end of the bellows assembly (50) is connected to the thermostat Dewar housing (10).

8. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 7, characterized in that, The bellows assembly (50) includes: The thermostat end cap sealing flange (51) is installed on the end face of the thermostat Dewar housing (10); A room temperature orifice sealing flange (52) is fitted onto the end of the room temperature orifice (20) that extends out of the thermostat Dewar housing (10); A welded bellows (53) is disposed between the thermostat end cap sealing flange (51) and the room temperature orifice sealing flange (52).

9. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 8, characterized in that, The thermostat Dewar housing (10) also includes: An interface module (12), mounted on the outer periphery of the housing (11) and extending radially along the housing (11), is used to accommodate a cooling circuit.

10. The high coaxiality room temperature aperture structure for a superconducting magnet cryostat according to claim 9, characterized in that, The thermostat Dewar housing (10) also includes: Post support (13) is located inside the thermostat Dewar housing (10); Adjust the base plate (14) and seal it on the Post support (13); A superconducting magnet support (15) is provided, one end of which is connected to the adjusting base plate (14), and the other end of which is connected to the superconducting solenoid magnet (30).

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