A conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity

Abstract

This invention discloses a conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity, belonging to the field of superconducting technology. It includes: a dual-cell superconducting cavity body comprising two adjacent accelerating ellipsoidal cavities and beam channels with different diameters on both sides of the accelerating unit; the superconducting cavity body is made of niobium; an equatorial cold ring comprising two equatorial cold rings arranged circumferentially in the equatorial region of the accelerating ellipsoidal cavity of the dual-cell superconducting cavity, with its inner surface in contact with the outer surface of the accelerating ellipsoidal cavity, and connected to a secondary cold source of a refrigerator via a flexible cold chain; a bundle tube cold ring comprising two bundle tube cold rings arranged circumferentially in the beam channel region of the superconducting cavity body, with its inner surface in contact with the outer surface of the superconducting cavity beam channel; and a thermal bridge structure comprising thermal bridge structures for connecting the bundle tube cold rings and the equatorial cold rings, and a thermal bridge structure for connecting the two equatorial cold rings. This invention enables the superconducting cavity to operate stably at a suitable low temperature using a commercial refrigerator.

Description

Technical Field

[0001] This invention belongs to the field of superconducting technology, and in particular to a conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity. Background Technology

[0002] Currently, superconducting accelerators based on niobium-based superconducting cavities are cooled by immersion in liquid helium at temperatures between 2K and 4K. This requires large-scale cryogenic cooling stations, complex thermostat systems, and professional cryogenic cooling maintenance teams, which is a major obstacle to the widespread application of radio frequency superconducting technology.

[0003] Currently, the radio frequency (RF) performance of superconducting cavities made of high-temperature superconducting materials with a superconducting transition temperature >15K at 4.2K or even under cold helium conditions has reached the level of niobium-based superconducting cavities at 2K. Meanwhile, industrial cryogenics technology has developed rapidly in recent years, achieving a cooling power of 2W at a low temperature of 4.2K, and the average maintenance cycle of domestically produced industrial cryogenics is currently as long as 18 months. Using commercial cryogenics for solid-state conduction cooling makes it possible to stably operate high-temperature superconducting cavities under low-temperature conditions. This will free them from the constraints of liquid helium and increase the accessibility of RF superconducting technology applications. Utility Model Content

[0004] The purpose of this invention is to provide a low-light thermal imaging dual-light fusion night vision device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity, comprising: The dual-cell superconducting cavity body includes two adjacent accelerating ellipsoidal cavities and beam pipes with different diameters set on both sides of the accelerating unit, and the superconducting cavity body is made of niobium. The equatorial cold ring consists of two equatorial cold rings, which are arranged circumferentially in the equatorial region of the accelerating ellipsoidal cavity of the dual-cell superconducting cavity. The inner surface is attached to the outer surface of the accelerating ellipsoidal cavity and is connected to the secondary cold source of the refrigerator through a flexible cold chain. The bundle tube cold ring includes two bundle tube cold rings, which are respectively arranged circumferentially in the beam channel region of the superconducting cavity body, and the inner surface is attached to the outer surface of the superconducting cavity beam channel; Thermal bridge structures include thermal bridge structures for connecting bundle tube cold rings and equatorial cold rings, respectively, and thermal bridge structures for connecting two equatorial cold rings.

[0006] In this preferred embodiment, the superconducting cavity material is niobium, with a superconducting transition temperature of 9.25K under zero magnetic field and a critical magnetic field of 0.015T at 4K.

[0007] In this preferred embodiment, the equatorial cold ring, the bundle tube cold ring, and the thermal bridge structure are all made of oxygen-free copper.

[0008] In this preferred embodiment, each equatorial cold ring is connected to the refrigerant of three secondary cold sources, and the central angle between the connection areas is 120°. Additionally, each equatorial cold ring is connected to the bundled tube cold ring via three thermal bridge structures, with the central angle between the connection areas also being 120°. The angle between adjacent cold source connection points and bundled tube thermal bridge connection points is 60°. The relative central axes of the two equatorial cold rings are rotated 180° to ensure that the angles of the secondary cold source connection points of different equatorial cold rings differ by 60° and do not overlap spatially.

[0009] In this preferred embodiment, each bundle tube cold ring has three thermal bridge connection areas, and the angle between these thermal bridge connection areas is 120°.

[0010] In this preferred embodiment, the thermal bridges connecting the bundled tube cold ring and the equatorial cold ring both adopt an inclined plate structure, with their two ends respectively connecting the thermal bridge connection area of ​​the bundled tube cold ring and the bundled tube thermal bridge connection area of ​​the equatorial cold ring.

[0011] In this preferred embodiment, the thermal bridge connecting the two equatorial cold rings adopts a straight plate structure, with its two ends connected to the cold source connection area of ​​the equatorial cold ring and the thermal bridge connection area of ​​the next equatorial cold ring, respectively.

[0012] Compared with the prior art, the technical effects and advantages of this utility model are as follows: The conductive cooling thermal bridge structure for the ellipsoidal superconducting cavity enables the superconducting cavity to operate stably at a suitable low temperature using a commercial refrigerator. This eliminates the need for complex thermostat design, expensive and large helium liquefaction cryogenic station, and professional cryogenic station operation and maintenance team, reducing the application difficulty of radio frequency superconducting technology. It has a natural advantage in the miniaturization and industrial application of radio frequency superconducting technology.

[0013] This technical solution employs a solid-state conductive cooling structure, connecting to the secondary cold source of the refrigerator via an equatorial cold ring and a bundled tube cold ring. Cooling can be achieved using only a commercial refrigerator. This design avoids the need for liquid helium immersion, greatly simplifying the complexity and cost of the cooling system. The solid-state conductive cooling structure reduces dependence on liquid helium, utilizing oxygen-free copper cold rings and thermal bridge structures. These materials possess excellent thermal conductivity and mechanical strength, ensuring stable operation of the cooling system. Furthermore, due to the use of a commercial refrigerator, the average maintenance cycle is as long as 18 months, significantly reducing maintenance frequency and difficulty.

[0014] This technical solution uses a flexible cold chain to connect the secondary cold source of the refrigerator. The equatorial cold ring and the bundled tube cold ring can effectively transfer cold energy to various key parts of the dual-cell superconducting cavity. The design of each cold ring and thermal bridge takes rotational symmetry into account, resulting in a more uniform distribution of cold energy, improving cooling efficiency and the operational stability of the superconducting cavity. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity according to the present invention; Figure 2 This is an axial cross-sectional view of the superconducting cavity conductive cooling structure of this utility model.

[0017] Explanation of reference numerals in the attached figures: In the diagram: 1. Dual-cell superconducting cavity body; 1-1. Accelerating ellipsoidal cavity; 1-2. One side beam channel; 1-3. The other side beam channel; 2. Equatorial cold ring; 2-1. First equatorial cold ring; 2-2. Second equatorial cold ring; 3. Bundle tube cold ring; 3-1. First bundle tube cold ring; 3-2. Second bundle tube cold ring; 4. Thermal bridge structure; 4-1. First thermal bridge connecting the bundle tube cold ring and the equatorial cold ring; 4-2. Second thermal bridge connecting the bundle tube cold ring and the equatorial cold ring; 4-3. Thermal bridge connecting the two equatorial cold rings. Detailed Implementation

[0018] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0019] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0020] This embodiment provides, for example Figures 1 to 2 The illustrated conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity includes: The dual-cell superconducting cavity body 1 includes two adjacent accelerating ellipsoidal cavities 1-1 and beam pipes with different diameters on both sides of the accelerating unit, one side beam pipe 1-2 and the other side beam pipe 1-3, and the superconducting cavity body is made of niobium. Equatorial cold ring 2, including the first equatorial cold ring 2-1 and the second equatorial cold ring 2-2, is arranged circumferentially in the equatorial region of the accelerating ellipsoidal cavity of the dual-cell superconducting cavity. Its inner surface is attached to the outer surface of the accelerating ellipsoidal cavity and is connected to the secondary cold source of the refrigerator through a flexible cold chain. The bundle tube cooling ring 3 includes a first bundle tube cooling ring 3-1 and a second bundle tube cooling ring 3-2, which are respectively arranged circumferentially in the beam channel region of the superconducting cavity body, and the inner surface is attached to the outer surface of the superconducting cavity beam channel. The thermal bridge structure 4 includes a first thermal bridge 4-1 connecting the bundle tube cold ring and the equatorial cold ring, a second thermal bridge 4-2 connecting the bundle tube cold ring and the equatorial cold ring, and a thermal bridge 4-3 connecting the two equatorial cold rings.

[0021] In this embodiment, the superconducting cavity 1 is made of niobium, with a superconducting transition temperature of 9.25K under zero magnetic field and a critical magnetic field of 0.015T at 4K.

[0022] In this embodiment, the equatorial cold ring 2, the bundle tube cold ring 3, and the thermal bridge structure 4 are all made of oxygen-free copper.

[0023] In this embodiment, each equatorial cold ring is connected to the refrigerant of three secondary cold sources, and the center angle between the connection areas is 120°. Additionally, each equatorial cold ring is connected to three thermal bridge structures 4 connected to the bundled tube cold ring 3, with the center angle between the connection areas also being 120°. The angle between adjacent cold source connection points and bundled tube thermal bridge connection points is 60°. The relative central axes of the two equatorial cold rings are rotated 180° to ensure that the angles of the secondary cold source connection points of different equatorial cold rings differ by 60° and do not overlap spatially.

[0024] In this embodiment, each bundle tube cold ring has three thermal bridge connection areas, and the angle between these thermal bridge connection areas is 120°.

[0025] In this embodiment, the first thermal bridge 4-1 connecting the bundled tube cold ring 3 and the equatorial cold ring 2 and the second thermal bridge 4-2 connecting the bundled tube cold ring and the equatorial cold ring both adopt an inclined plate structure, with their two ends respectively connecting the thermal bridge connection area of ​​the bundled tube cold ring and the bundled tube thermal bridge connection area of ​​the equatorial cold ring.

[0026] In this embodiment, the thermal bridge 4-3 connecting the two equatorial cold rings adopts a straight plate structure, with its two ends connected to the cold source connection area of ​​the first equatorial cold ring 2-1 and the thermal bridge connection area of ​​the second equatorial cold ring 2-2, respectively.

[0027] The working principle of this structure is as follows: The equatorial cold ring 2 is connected to the secondary cold source of the refrigerator via a flexible cold chain, providing cooling for the entire structure. Simultaneously, the thermal bridges 2, bundle tube cold ring 3, and thermal bridge 4 distribute the thermal energy throughout the superconducting cavity, thus maintaining the superconducting cavity in a low-temperature superconducting operating state. Simulation results of the overall temperature distribution of the superconducting cavity under normal operating conditions show that the temperature of the secondary cold source of the refrigerator is set to 3.02 K through table lookup iteration, the contact thermal resistance is set to 1000 K·cm² / W, and both contact and radiative cooling losses are 0.05 W. The heat generated on the inner wall of the superconducting cavity is 1.38 W. It can be seen that the highest overall temperature of the superconducting cavity is 3.15 K, indicating that the entire cavity is under a very good superconducting temperature and can operate normally without experiencing superconductivity issues.

[0028] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A conduction-cooled thermal-bridge structure for an ellipsoidal superconducting cavity, characterized by, include: The dual-cell superconducting cavity body (1) includes two adjacent accelerating ellipsoidal cavities (1-1) and beam channels with different diameters on both sides of the accelerating unit, one side beam channel (1-2) and the other side beam channel (1-3), and the superconducting cavity body is made of niobium. The equatorial cold ring (2) includes a first equatorial cold ring (2-1) and a second equatorial cold ring (2-2), and is set along the circumferential direction in the equatorial region of the accelerating ellipsoidal cavity of the dual-cell superconducting cavity. The inner surface is attached to the outer surface of the accelerating ellipsoidal cavity and is connected to the secondary cold source of the refrigerator through a flexible cold chain. The bundle tube cooling ring (3) includes a first bundle tube cooling ring (3-1) and a second bundle tube cooling ring (3-2), and is respectively arranged in the beam channel region of the superconducting cavity body along the circumferential direction, with the inner surface of the ring being attached to the outer surface of the superconducting cavity beam channel; The thermal bridge structure (4) includes a first thermal bridge (4-1) for connecting the bundle tube cold ring and the equatorial cold ring, a second thermal bridge (4-2) for connecting the bundle tube cold ring and the equatorial cold ring, and a thermal bridge (4-3) for connecting the two equatorial cold rings.

2. A conduction cooled thermal bridge structure for an ellipsoidal superconducting cavity as defined in claim 1, wherein: The superconducting cavity (1) is made of niobium, with a superconducting transition temperature of 9.25K under zero magnetic field and a critical magnetic field of 0.015T at 4K.

3. A conduction cooled thermal bridge structure for an ellipsoidal superconducting cavity as defined in claim 2, wherein: The equatorial cold ring (2), the bundle tube cold ring (3), and the thermal bridge structure (4) are all made of oxygen-free copper.

4. A conduction cooled thermal bridge structure for an ellipsoidal superconducting cavity as defined in claim 3, wherein: Each of the equatorial cold rings is connected to the refrigerant of three secondary cold sources, and the center angle between the connected regions is 120°.

5. A conduction cooled thermal bridge structure for an ellipsoidal superconducting cavity as defined in claim 4, wherein: Each of the bundled tube cold rings has three thermal bridge connection areas, and the angle between these thermal bridge connection areas is 120°.

6. The conductive cooling thermal bridge structure for an ellipsoidal superconducting cavity according to claim 5, characterized in that: The first thermal bridge (4-1) connecting the bundled tube cold ring (3) and the equatorial cold ring (2) and the second thermal bridge (4-2) connecting the bundled tube cold ring and the equatorial cold ring both adopt an inclined plate structure, with the ends of the bridge connecting area of ​​the bundled tube cold ring and the bundled tube thermal bridge connecting area of ​​the equatorial cold ring respectively.

7. A conduction cooled thermal bridge structure for an ellipsoidal superconducting cavity as defined in claim 6, wherein: The thermal bridge (4-3) connecting the two equatorial cold rings (2) adopts a straight plate structure, with its two ends connected to the cold source connection area of ​​the first equatorial cold ring (2-1) and the thermal bridge connection area of ​​the second equatorial cold ring (2-2), respectively.

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