A superconducting accelerator

Abstract

The application discloses a superconducting accelerating device, and relates to the technical field of accelerators. The superconducting accelerating device comprises a low-temperature unit, a cavity string unit and a hoisting unit. The low-temperature unit comprises a helium return pipe. The cavity string unit is arranged on one side of the helium return pipe in parallel, and comprises a superconducting cavity mechanism and a plurality of helium grooves. The plurality of helium grooves are sequentially fixed on the superconducting cavity mechanism along the axial direction of the superconducting cavity mechanism. At least one pair of connecting ears is arranged on the side of the helium groove away from the superconducting cavity mechanism. The two connecting ears of the same pair are arranged on the two sides of the helium groove. One of the helium return pipe and the connecting ear is fixedly connected with one end of the hoisting unit, and the other is slidably connected with the other end of the hoisting unit. The superconducting accelerating device can avoid fatigue damage of components in the superconducting cavity mechanism caused by shrinkage.

Description

Technical Field

[0001] This application relates to the field of accelerator technology, and more particularly to a superconducting accelerator device. Background Technology

[0002] High repetition rate X-ray free electron lasers are currently the most advanced X-ray sources in the world. They possess characteristics such as extremely high peak brightness, high average brightness, ultrashort pulses, and high coherence, providing unprecedented research tools for disciplines such as physics, chemistry, biomedicine, materials science, and energy science. They also provide opportunities for the revolutionary development of the semiconductor industry, represented by extreme ultraviolet lithography.

[0003] In the generation of high-repetition-rate X-ray free-electron lasers, superconducting accelerator modules are typically required. However, in existing superconducting accelerator modules, the two ends of the superconducting cavity contract synchronously under the contraction of the helium return tube, causing other structural components between the superconducting cavities to be damaged due to deformation fatigue. Summary of the Invention

[0004] This application provides a superconducting accelerator device that avoids the cavity string unit from shrinking proportionally due to the contraction of the helium return pipe during the cooling process, thereby preventing fatigue damage to components in the superconducting cavity mechanism caused by contraction.

[0005] This application provides a superconducting accelerator device, comprising:

[0006] Cryogenic unit, including helium return pipe;

[0007] A cavity string unit is arranged in parallel on one side of the helium return pipe. The cavity string unit includes a superconducting cavity mechanism and multiple helium slots. The multiple helium slots are sequentially fixedly sleeved on the superconducting cavity mechanism along the axial direction of the superconducting cavity mechanism. At least one pair of connecting ears protrudes from the side of the helium slot away from the superconducting cavity mechanism. The two connecting ears of the same pair are respectively located on both sides of the helium slot.

[0008] The hoisting unit is configured with each pair of connecting lugs. One of the helium return pipe and the connecting lug is fixedly connected to one end of the hoisting unit, and the other is slidably connected to the other end of the hoisting unit.

[0009] Based on the above technical solution, when the helium return pipe contracts during the cooling process, the hoisting unit of the hoisting cavity string unit is slidably connected to the helium tank. This prevents the helium return pipe from moving synchronously with the helium tank and avoids the superconducting cavity mechanism from contracting synchronously under the influence of the end helium tank. Consequently, it prevents damage to the structure in the superconducting cavity mechanism due to excessive contraction deformation. At the same time, it also meets the precision requirements of the superconducting cavity mechanism and improves the beam quality.

[0010] In some possible implementations, the hoisting unit includes a hoisting bracket and two slider mechanisms;

[0011] The hoisting support includes a main body and two connecting arms. The main body is fixedly connected to the helium return pipe, and the two connecting arms are respectively located on both sides of the helium tank.

[0012] The two slider mechanisms are connected one-to-one to the ends of the two connecting arms away from the main body, and the two slider mechanisms are slidably connected one-to-one with the two connecting ears of the same pair.

[0013] In some possible implementations, the slider mechanism includes:

[0014] A sliding block has a groove on the side near the connecting ear, and the connecting ear is slidably disposed in the groove; and

[0015] A lubrication assembly is disposed between the connecting lug and any inner wall of the slide groove, and makes rolling contact with the connecting lug.

[0016] In some possible implementations, the lubrication assembly includes a support plate and needle rollers, the support plate being floated relative to the inner wall of the groove to be close to or away from the connecting lug;

[0017] The needle roller is rotatably mounted on the side of the support plate near the connecting ear and rolls in contact with the connecting ear.

[0018] In some possible implementations, the lubrication assembly is floating relative to the inner wall of the groove, wherein one of the slider mechanisms further includes an elastic component and two adjusting components mounted on the slider block;

[0019] The elastic component is disposed on the side of the connecting ear away from the helium groove and abuts against the lubrication component on that side to drive the lubrication component to roll into contact with the connecting ear;

[0020] One of the adjustment components is disposed on the side of the connecting lug close to the helium return pipe and abuts against the lubrication component on that side, and is used to adjust the abutment pressure between the lubrication component and the connecting lug;

[0021] Another adjustment component is disposed on the side of the connecting lug away from the helium return pipe and abuts against the lubrication component on that side, and is used to adjust the abutment pressure between the lubrication component and the connecting lug.

[0022] In some possible implementations, the resilient component includes a mounting sleeve, a push rod, and a resilient element;

[0023] The mounting sleeve is fixedly installed on the sliding block, and the push rod slides through the mounting sleeve along the floating direction of the lubrication assembly, and protrudes relative to the groove to abut against the lubrication assembly on the corresponding side;

[0024] The push rod is provided with a first limiting flange, the mounting sleeve is provided with a second limiting flange, and the elastic element abuts between the first limiting flange and the second limiting flange to drive the push rod to abut against the lubrication assembly.

[0025] In some possible implementations, another slider mechanism may further include two elastic components and one adjustment component mounted on the slider block;

[0026] One of the elastic components of the slider mechanism is disposed on the side of the connecting lug away from the helium groove and abuts against the lubrication component on that side to drive the lubrication component to roll into contact with the connecting lug;

[0027] Another elastic component of the slider mechanism is disposed on the side of the connecting lug near the helium return pipe and abuts against the lubrication component on that side to drive the lubrication component to roll into contact with the connecting lug;

[0028] The adjusting component of the slider mechanism is located on the side of the connecting lug away from the helium return pipe and abuts against the lubrication component on that side, and is used to adjust the abutment pressure between the lubrication component and the connecting lug.

[0029] In some possible implementations, the superconducting accelerator also includes an Invar rod;

[0030] The Invar rod is fixedly connected to the middle part of the helium return pipe along its axial direction, and the Invar rod is fixedly connected to each of the helium tanks.

[0031] In some possible implementations, the cryogenic unit further includes a cold shield, in which the helium return pipe and the cavity string unit are disposed.

[0032] In some possible implementations, the superconducting accelerator further includes a vacuum container, a first cryogenic insulation support structure, and a second cryogenic insulation support structure, wherein the cryogenic unit and the cavity string unit are disposed in the vacuum container;

[0033] The middle part of the helium return pipe is fixedly connected to the vacuum container via the first cryogenic insulation support structure. A second cryogenic insulation support structure is connected to each of the two ends of the helium return pipe. The end of the second cryogenic insulation support structure away from the helium return pipe is slidably connected to the vacuum container. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic front view of the superconducting accelerator device in some embodiments is shown;

[0036] Figure 2 A partial internal structure schematic diagram of the superconducting accelerator device in some embodiments is shown;

[0037] Figure 3 It shows Figure 2 A magnified schematic diagram of part A in the middle section;

[0038] Figure 4 It shows Figure 2 A partially enlarged structural diagram of section B;

[0039] Figure 5 Schematic diagrams of the internal structure of the superconducting accelerator device in some embodiments are shown;

[0040] Figure 6 The diagram shows partial structural schematics of the helium return pipe and cavity string unit in some embodiments;

[0041] Figure 7 A cross-sectional schematic diagram of the superconducting accelerator device in some embodiments is shown;

[0042] Figure 8 It shows Figure 7 A magnified schematic diagram of part C in the middle.

[0043] Explanation of key component symbols:

[0044] 100 - Cryogenic unit; 110 - Helium return pipe; 120 - Cold shield; 131 - Liquid helium injection pipe; 132 - Liquid helium return pipe;

[0045] 200 - Cavity string unit; 210 - Superconducting cavity mechanism; 211 - Superconducting cavity; 212 - Vacuum tube; 213 - Bellows; 220 - Helium tank; 221 - Connecting lug;

[0046] 300-Lifting unit; 310-Lifting bracket; 311-Main body; 312-Connecting arm; 320-Slider mechanism; 3201-First slider mechanism; 3202-Second slider mechanism; 321-Sliding block; 3211-Slide groove; 3212-First inner wall; 3213-Second inner wall; 3214-Third inner wall; 3215-Settling groove; 322-Lubrication assembly; 3221-Bearing plate; 3222-Needle roller; 323-Elastic assembly; 3231-Mounting sleeve; 32311-Second limiting flange; 3232-Top rod; 32321-First limiting flange; 3233-Elastic element; 324-Adjusting assembly; 3241-Adjusting bolt; 3242-Adjusting nut;

[0047] 400 - Vacuum container;

[0048] 510 - Magnet module; 520 - Coupler; 530 - Tuner;

[0049] 600-Invar rod;

[0050] 710 - First low-temperature insulation support structure; 720 - Second low-temperature insulation support structure; 730 - Transmission rod; 740 - Cylindrical bearing; 750 - Suspension arm. Detailed Implementation

[0051] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. 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 explicitly specified.

[0054] 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 or an electrical 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.

[0055] In this application, unless otherwise expressly 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," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply 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 that the first feature is at a lower horizontal level than the second feature.

[0056] like Figures 1 to 3 , Figure 5 As shown, the embodiment provides a superconducting acceleration device, which may include a cryogenic unit 100, a cavity string unit 200, and a hoisting unit 300.

[0057] The cryogenic unit 100 can be used to provide a cryogenic environment. In this embodiment, the cryogenic unit 100 may include a helium return pipe 110.

[0058] The cavity string unit 200 can be arranged side-by-side on one side of the helium return pipe 110. The cavity string unit 200 includes a superconducting cavity mechanism 210 and multiple helium grooves 220. The multiple helium grooves 220 can be sequentially fixedly sleeved on the superconducting cavity mechanism 210 along the axial direction of the superconducting cavity mechanism 210. The axial direction of the superconducting cavity mechanism 210 can be parallel to the axial direction of the superconducting accelerator.

[0059] In addition, at least one pair of connecting lugs 221 protrude from the side of the helium tank 220 away from the superconducting cavity mechanism 210. The two connecting lugs 221 of the same pair can be respectively disposed on both sides of the helium tank 220, and can be symmetrically arranged about the helium return pipe 110. It can be understood that each helium tank 220 is provided with a protruding connecting lug 221.

[0060] The hoisting unit 300 can be used to hoist the cavity string unit 200 onto the helium return pipe 110. Specifically, each pair of connecting ears 221 is equipped with a hoisting unit 300. In some embodiments, one end of the hoisting unit 300 can be fixedly connected to the helium return pipe 110, and the other end of the hoisting unit 300 can be slidably connected to the two connecting ears 221.

[0061] In other embodiments, one end of the hoisting unit 300 may be slidably connected to the helium return pipe 110, and the other end of the hoisting unit 300 may be fixedly connected to the two connecting lugs 221.

[0062] During operation, the helium return pipe 110 will significantly contract during cooling. The end of the helium return pipe 110 can contract towards the middle, with a contraction displacement of approximately 16 mm. In this embodiment, when the helium return pipe 110 contracts during cooling, the hoisting unit 300 can slide relative to the connecting lug 221. This prevents the helium groove 220 from contracting synchronously under the contraction of the helium return pipe 110, thereby preventing the two ends of the superconducting cavity mechanism 210 from contracting synchronously under the influence of the helium groove 220 at the end position. On the one hand, this avoids fatigue damage to the components in the superconducting cavity mechanism 210 due to significant contraction. On the other hand, it also ensures that the superconducting cavity mechanism 210 meets precision requirements and improves beam quality.

[0063] like Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the superconducting cavity mechanism 210 may include a vacuum tube 212 and eight superconducting cavity segments 211. The vacuum tube 212 and the eight superconducting cavity segments 211 are sequentially connected. Adjacent superconducting cavities 211 can be connected by a bellows 213, and the vacuum tube 212 can be connected to an adjacent superconducting cavity 211 by a bellows 213. In each embodiment, a helium groove 220 is fixedly fitted onto the outer side of each superconducting cavity 211.

[0064] In other embodiments, the number of superconducting cavities 211 can be set to three, four, six, or ten segments as needed, without specific limitations.

[0065] In some embodiments, the superconducting accelerator further includes a magnet module 510, a coupler 520, and a tuner 530. The magnet module 510 can be sleeved on the outside of the vacuum tube 212. In each embodiment, each superconducting cavity 211 is equipped with a coupler 520, which can be connected to the end of the superconducting cavity 211 near the vacuum tube 212 and is positioned between the helium tank 220 and the bellows 213 connected to the superconducting cavity 211. Additionally, each superconducting cavity 211 is equipped with a tuner 530, which can be connected to the end of the superconducting cavity 211 away from the vacuum tube 212. The connection position of the tuner 530 to the superconducting cavity 211 can be located between the helium tank 220 and the bellows 213 connected to the superconducting cavity 211. Furthermore, the tuner 530 can be connected to the helium tank 220 outside the superconducting cavity 211.

[0066] It is understandable that when the two ends of the superconducting cavity mechanism 210 contract towards the middle, the bellows 213 will undergo contraction deformation. When the superconducting cavity mechanism 210 undergoes a large-scale contraction, it will undoubtedly lead to fatigue damage of the bellows 213. In this embodiment, the two ends of the helium return pipe 110 can be moved relative to the superconducting cavity mechanism 210 by the slider mechanism 320, which can prevent the superconducting cavity mechanism 210 from contracting synchronously under the driving action of the helium return pipe 110, thereby avoiding fatigue damage to the bellows 213.

[0067] like Figures 2 to 5 As shown, each helium tank 220 is equipped with two pairs of connecting lugs 221, which can be arranged sequentially along the axial direction of the cavity string unit 200. The two pairs of connecting lugs 221 are respectively located near the two ends of the helium tank 220. Correspondingly, both ends of the helium tank 220 are suspended from the helium return pipe 110 by the hoisting unit 300.

[0068] In this embodiment, the hoisting unit 300 may include a hoisting bracket 310 and two sliding block mechanisms 320. The hoisting bracket 310 may include an integral body 311 and two connecting arms 312. The body 311 may be fixedly connected to the helium return pipe 110 by welding or bolting. The two connecting arms 312 may be connected to one end of the body 311 and are arranged opposite to each other. In addition, the two connecting arms 312 may be respectively located on both sides of the helium tank 220. The two sliding block mechanisms 320 are connected one-to-one to the ends of the two connecting arms 312 away from the body 311 and are slidably connected to the connecting ears 221 on the corresponding sides. The two sliding block mechanisms 320 may be referred to as the first sliding block mechanism 3201 and the second sliding block mechanism 3202.

[0069] In some embodiments, the first slider mechanism 3201 may include a slider block 321 and a lubrication assembly 322. The slider block 321 may be fixedly connected to the side of the connecting arm 312 near the helium tank 220 by means of screw connection or welding. In addition, a groove 3211 is provided on the side of the slider block 321 near the helium tank 220, and the connecting ear 221 may be slidably disposed in the groove 3211.

[0070] In some embodiments, the slide 3211 may be a flat U-shaped groove. Accordingly, the slide 3211 may include a first inner wall 3212, a second inner wall 3213, and a third inner wall 3214. The first inner wall 3212 may face the surface of the connecting ear 221 away from the helium tank 220. The second inner wall 3213 and the third inner wall 3214 are disposed opposite each other, with the second inner wall 3213 facing the surface of the connecting ear 221 near the helium return pipe 110, and the third inner wall 3214 facing the surface of the connecting ear 221 away from the helium return pipe 110.

[0071] In some embodiments, a lubrication assembly 322 is disposed between the first inner wall 3212 and the connecting ear 221, between the second inner wall 3213 and the connecting ear 221, and between the third inner wall 3214 and the connecting ear 221. When the connecting ear 221 moves relative to the sliding block 321, the lubrication assembly 322 can provide lubrication for the relative movement between the connecting ear 221 and the sliding block 321, thereby reducing the resistance between the connecting ear 221 and the sliding block 321, and thus reducing the probability that the helium tank 220 moves synchronously under the contraction of the helium return pipe 110.

[0072] In this embodiment, the three sets of lubrication components 322 have the same structure and installation method. The lubrication component 322 between the first inner wall 3212 and the connecting ear 221 will be described in detail below.

[0073] In some embodiments, the lubrication assembly 322 may include a support plate 3221 and needle rollers 3222. The support plate 3221 is floating relative to the first inner wall 3212. Specifically, the first inner wall 3212 also has a recessed groove 3215 extending away from the connecting ear 221. The support plate 3221 is movably disposed in the groove 3215 to move closer to or further away from the connecting ear 221. The needle rollers 3222 are rotatably mounted on the side of the support plate 3221 near the connecting ear 221 and protrude relative to this side. In this embodiment, the needle rollers 3222 can roll in contact with the connecting ear 221 to reduce resistance when the connecting ear 221 moves relative to the sliding block 321.

[0074] In other embodiments, the support plate 3221 may also be fixedly installed in the settling tank 3215.

[0075] In other embodiments, the lubrication assembly 322 may include balls that can be directly rolled and embedded in the sliding block 321 and protrude relative to the inner wall of the groove 3211, and the balls can roll into contact with the connecting lug 221.

[0076] In some embodiments, the first slider mechanism 3201 further includes an elastic component 323 and two adjusting components 324.

[0077] The elastic component 323 can be installed on the side of the sliding block 321 near the second inner wall 3213 and abut against the lubrication component 322 near the second inner wall 3213 to drive the lubrication component 322 to roll into contact with the connecting ear 221.

[0078] The elastic component 323 may include a mounting sleeve 3231, a push rod 3232, and an elastic element 3233. The mounting sleeve 3231 is fixedly mounted on the sliding block 321. The push rod 3232 can slide through the mounting sleeve 3231 in a direction perpendicular to the support plate 3221. The push rod 3232 can protrude from the side of the mounting sleeve 3231 closest to the support plate 3221 to abut against the support plate 3221.

[0079] A first limiting flange 32321 protrudes from a portion of the push rod 3232 within the mounting sleeve 3231. A second limiting flange 32311 is provided at the end of the mounting sleeve 3231 away from the support plate 3221. An elastic member 3233 can be sleeved on the push rod 3232 and abuts against the first limiting flange 32321 and the second limiting flange 32311. In the embodiment, the elastic member 3233 can be in a compressed state or a naturally extended state to drive the push rod 3232 to abut against the support plate 3221 of the lubrication assembly 322 and push the needle roller 3222 of the lubrication assembly 322 to contact the connecting ear 221. In some embodiments, the elastic member 3233 can be a disc spring.

[0080] In other embodiments, the elastic element 3233 may also be a spring or other structure.

[0081] In one embodiment, an adjustment component 324 may be installed on the side of the sliding block 321 near the first inner wall 3212 and abut against the lubrication component 322 near the first inner wall 3212 to adjust the floating height of the lubrication component 322 relative to the position groove 3215, that is, the floating distance relative to the first inner wall 3212.

[0082] Another adjustment component 324 can be installed on the side of the sliding block 321 near the third inner wall 3214 and abut against the lubrication component 322 near the third inner wall 3214. The adjustment component 324 can be used to adjust the floating height of the lubrication component 322 relative to the position recess 3215, that is, the floating distance relative to the third inner wall 3214.

[0083] The adjusting assembly 324 may include an adjusting bolt 3241 and an adjusting nut 3242. The adjusting nut 3242 may be fixedly connected to the side of the sliding block 321 away from the slide groove 3211, i.e., the outer side of the sliding block 321, by means of welding or other methods. The adjusting bolt 3241 may be screwed onto the adjusting nut 3242 and pass through the sliding block 321 to extend into the corresponding groove 3215, abutting against the lubrication assembly 322.

[0084] In this embodiment, the protrusion length of the adjusting bolt 3241 relative to the corresponding side groove 3215 can be adjusted by turning the adjusting bolt 3241, thereby driving the corresponding side lubrication component 322 to float relative to the groove 3215.

[0085] like Figure 3 and Figure 4 As shown, the structure of the second slider mechanism 3202 is roughly the same as that of the first slider mechanism 3201. The difference lies in that the second slider mechanism 3202 includes an adjusting component 324 and two elastic components 323. One elastic component 323 can be installed on the side of the slider block 321 near the first inner wall 3212. The other elastic component 323 can be installed on the side of the slider block 321 near the second inner wall 3213. The adjusting component 324 can be installed on the side of the slider block 321 near the third inner wall 3214.

[0086] It is understood that, in the first direction perpendicular to the axial direction of the superconducting cavity mechanism 210, each connecting lug 221 has an elastic component 323 and an adjusting component 324 respectively disposed on both sides. Thus, the adjusting component 324 can adjust the resistance of the corresponding lubrication component 322 against the connecting lug 221, thereby adjusting the rolling friction between the lubrication component 322 and the connecting lug 221. While ensuring rolling contact between the lubrication component 322 and the connecting lug 221, the rolling friction resistance between them is minimized as much as possible.

[0087] Furthermore, in the pair of connecting ears 221, one connecting ear 221 has an elastic component 323 disposed on the side away from the helium tank 220, and the other connecting ear 221 has an adjustment component 324 disposed on the side away from the helium tank 220. Thus, the resistance between the lubrication component 322 and the connecting ear 221 can be adjusted in a second direction perpendicular to the axial direction of the superconducting cavity mechanism 210, thereby adjusting the rolling friction between the lubrication component 322 and the connecting ear 221. This ensures rolling contact between the lubrication component 322 and the connecting ear 221 while minimizing the rolling friction resistance between them. The second direction is perpendicular to the first direction.

[0088] In some other embodiments, the elastic component 323 may be replaced by the adjusting component 324. Alternatively, the adjusting component 324 may be replaced by the elastic component 323.

[0089] In other embodiments, a lubrication assembly 322 may be provided only between the third inner wall 3214 and the connecting ear 221, i.e., the lubrication assembly 322 is located below the direction of gravity to provide lubrication for the relative movement between the sliding block 321 and the connecting ear 221.

[0090] like Figure 5 and Figure 6 As shown, the superconducting accelerator further includes an Invar rod 600, which extends axially along the superconducting accelerator. The Invar rod 600 is fixedly connected to the middle portion of the helium return pipe 110 along its axial direction. Additionally, the Invar rod 600 is fixedly connected to each helium slot 220 in the cavity string unit 200.

[0091] In this embodiment, the Invar rod 600 has an extremely small coefficient of thermal expansion, resulting in only a small amount of contraction during the cooling process of the superconducting accelerator, with a contraction displacement of approximately 1.9 mm, which is within the allowable contraction deformation range of the bellows 213. This prevents the superconducting cavity mechanism 210 from undergoing large-scale contraction during cooling, further preventing damage to the bellows 213 due to excessive contraction deformation. It also ensures the collimation accuracy requirements of the superconducting cavity mechanism 210 and improves beam quality.

[0092] like Figure 1 As shown, the cryogenic unit 100 also includes a cold shield 120. A helium return pipe 110 and a cavity string unit 200 can be disposed within the cold shield 120, which can prevent heat radiation from the external environment to the internal structure of the cold shield 120. It is understood that the cold shield 120 can be equipped with a liquid helium injection pipe 131 and a liquid helium return pipe 132. The liquid helium injection pipe 131 and the liquid helium return pipe 132 can be disposed on opposite sides of the cold shield 120, both located on the side of the cold shield 120 closest to the helium return pipe 110, and are fixedly connected to the cold shield 120.

[0093] Combined again Figure 7 and Figure 8 In this embodiment, the superconducting accelerator also includes a vacuum container 400, which can be fitted onto the side of the cold screen 120 away from the helium return pipe 110, i.e., the vacuum container 400 is fitted onto the outside of the cold screen 120. In addition, the helium return pipe 110 can be hoisted and connected to the vacuum container 400 through a first cryogenic insulation support structure 710 and a second cryogenic insulation support structure 720.

[0094] Specifically, along the axial direction of the helium return pipe 110, the middle part of the helium return pipe 110 can be fixedly connected to the first cryogenic insulation support structure 710. The other end of the first cryogenic insulation support structure 710 can be fixedly connected to the vacuum container 400. It can be understood that a through hole can be opened on the cold shield 120 for the first cryogenic insulation support structure 710 to pass through.

[0095] Both ends of the helium return pipe 110 can be slidably connected to the vacuum container 400 via a second cryogenic insulation support structure 720. Specifically, the second cryogenic insulation support structure 720 is fixedly connected to the helium return pipe 110. Two symmetrical suspension arms 750 are configured at the end of the second cryogenic insulation support structure 720 away from the helium return pipe 110, and the suspension arms 750 can be in an inverted L-shape. A transmission rod 730 is fixedly connected to the end of the suspension arm 750 away from the helium return pipe 110. The transmission rod 730 can be perpendicular to the axial direction of the helium return pipe 110 and parallel to the first direction. Additionally, a flat cylindrical bearing 740 can be configured on the vacuum container 400. The base plate of the cylindrical bearing 740 can be fixedly connected to the vacuum container 400, and the top cover of the cylindrical bearing 740 can be fixedly connected to the transmission rod 730. When the helium return pipe 110 contracts, the transmission rod 730 can be moved via the second cryogenic insulation support structure 720. During this process, the top plate of the cylindrical bearing 740 can be displaced relative to the bottom plate. It is understood that the operating principle of the cylindrical bearing 740 is similar to that of the lubrication assembly 322. In this embodiment, the cold shield 120 also has a through hole through which the second cryogenic insulation support structure 720 passes.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, 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.

[0097] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A superconducting accelerator device, characterized by, The utility model relates to a helium liquefier, and more particularly to a helium liquefier with a helium return pipe, a cavity string unit and a lifting unit. The cavity string unit is arranged on one side of the helium return pipe and includes a superconducting cavity mechanism and a plurality of helium slots. Each pair of connecting ears is provided with a lifting unit. The lifting unit is fixedly connected with one end of the helium return pipe and the connecting ears, and is slidably connected with the other end of the helium return pipe and the connecting ears. The lifting unit includes a lifting bracket and two sliding block mechanisms.

2. The superconducting acceleration device of claim 1, wherein, The lifting bracket includes a body portion and two connecting arms. The body portion is fixedly connected with the helium return pipe, and the two connecting arms are arranged on the two sides of the helium slots.

3. The superconducting acceleration device of claim 1 or 2, wherein, The sliding block mechanism includes a sliding block and a lubricating assembly. The sliding block is provided with a sliding groove on the side close to the connecting ear. The connecting ear is slidably arranged in the sliding groove. The sliding groove includes a first inner wall, a second inner wall and a third inner wall.

4. The superconducting accelerator of claim 3, wherein, The first inner wall is opposite to the side surface of the connecting ear away from the helium slots. The second inner wall is opposite to the surface of the connecting ear close to the helium return pipe. The third inner wall is opposite to the surface of the connecting ear away from the helium return pipe. The lubricating assembly is arranged between the first inner wall and the connecting ear, between the second inner wall and the connecting ear, and between the third inner wall and the connecting ear. The lubricating assembly is in rolling contact with the connecting ear. The lubricating assembly is arranged in floating manner relative to the inner wall of the sliding groove. One of the sliding block mechanisms further includes an elastic assembly and two adjusting assemblies. The elastic assembly is arranged on the side of the connecting ear away from the helium slots and abuts against the lubricating assembly on the same side to drive the lubricating assembly to be in rolling contact with the connecting ear. One of the adjusting assemblies is arranged on the side of the connecting ear close to the helium return pipe and abuts against the lubricating assembly on the same side to adjust the pressing force between the lubricating assembly and the connecting ear. The other adjusting assembly is arranged on the side of the connecting ear away from the helium return pipe and abuts against the lubricating assembly on the same side to adjust the pressing force between the lubricating assembly and the connecting ear. The elastic assembly includes a mounting sleeve, a jack and an elastic member. The mounting sleeve is fixedly mounted on the sliding block. The jack is slidably arranged in the mounting sleeve in the floating direction of the lubricating assembly and protrudes relative to the sliding groove to abut against the lubricating assembly on the corresponding side. The elastic member is arranged on the side of the connecting ear away from the helium slots and abuts against the lubricating assembly on the same side to drive the lubricating assembly to be in rolling contact with the connecting ear. The top rod is provided with a first limiting flange, the mounting sleeve is provided with a second limiting flange, and the elastic member is abutted between the first limiting flange and the second limiting flange to drive the top rod to abut against the lubricating assembly.

5. The superconducting accelerator of claim 3, wherein, Another said slider mechanism further comprises two said elastic assemblies and a said adjusting assembly mounted on the sliding block; One said elastic assembly of the slider mechanism is arranged on the side of the connecting lug away from the helium groove and abuts against the lubricating assembly on the side to drive the lubricating assembly to rollingly contact the connecting lug; Another said elastic assembly of the slider mechanism is arranged on the side of the connecting lug close to the helium return pipe and abuts against the lubricating assembly on the side to drive the lubricating assembly to rollingly contact the connecting lug; The said adjusting assembly of the slider mechanism is arranged on the side of the connecting lug away from the helium return pipe and abuts against the lubricating assembly on the side and is used for adjusting the pressing force between the lubricating assembly and the connecting lug.

6. The superconducting acceleration device of claim 1 or 2, wherein, The superconducting acceleration device further comprises an Invar rod; The Invar rod is fixedly connected with the middle part of the helium return pipe in the axial direction, and the Invar rod is fixedly connected with each said helium groove.

7. The superconducting accelerator of claim 1, wherein, The low-temperature unit further comprises a cold screen, and the helium return pipe and the cavity string unit are arranged in the cold screen.

8. The superconducting acceleration device of claim 1 or 7, wherein, The superconducting acceleration device further comprises a vacuum container, a first low-temperature thermal insulation support structure and a second low-temperature thermal insulation support structure, and the low-temperature unit and the cavity string unit are arranged in the vacuum container. The middle part of the helium return pipe in the axial direction is fixedly connected with the vacuum container through the first low-temperature thermal insulation support structure, and the two end parts of the helium return pipe are respectively connected with a said second low-temperature thermal insulation support structure, and the end of the second low-temperature thermal insulation support structure away from the helium return pipe is slidingly connected with the vacuum container.

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