A compact superconducting cyclotron cavity for isotope production

Abstract

The application relates to a compact superconducting cyclotron cavity for isotope production. The compact superconducting cyclotron cavity comprises a shell, a Dee plate, a head connecting block, a tail connecting block, a framework, an inner rod, a fixed capacitance tuner, a movable capacitance tuner and a coupler. The shell comprises an upper and lower symmetrical spiral shell upper plate and a shell lower plate; the Dee plate is arranged in parallel with the shell upper plate and the shell lower plate and is located between the shell upper plate and the shell lower plate, the Dee plate comprises an upper and lower symmetrical spiral upper Dee plate and a lower Dee plate; the head connecting block is arranged at the head of the Dee plate and is connected with the upper Dee plate and the lower Dee plate; the tail connecting block is arranged at the tail of the Dee plate and is connected with the upper Dee plate and the lower Dee plate; the framework is arranged between the upper Dee plate and the lower Dee plate to support the upper Dee plate and the lower Dee plate; the shell and the Dee plate are connected through the inner rod, and the inner rod is an upper and lower symmetrical structure. The application provides a high-efficiency and stable cavity for a high-energy and high-current cyclotron.

Description

Technical Field

[0001] The present invention relates to a superconducting cyclotron accelerator, and more specifically, to a compact superconducting cyclotron accelerator cavity for isotope production. Background Technology

[0002] With the rapid development of fields such as radioactive isotope production and heavy ion cancer therapy, the demand for high-energy, high-current beams is becoming increasingly urgent. High-current cyclotrons, due to their low cost and high stability, have become an ideal choice for isotope production. The high-frequency system, as the core component of the cyclotron, is responsible for providing the necessary energy for ion acceleration. To meet the demands of isotope production, cyclotrons need to maintain stable operation under high-energy, high-current conditions.

[0003] However, traditional cavity designs face many technical shortcomings in large-scale designs: First, the volume and weight increase significantly, making it difficult to maintain compactness. At the same time, under large volume and high flow conditions, the cavity is prone to structural deformation, which in turn affects the stability of the cavity in long-term operation. Furthermore, in large-scale designs, manufacturing errors can significantly affect the cavity frequency, leading to frequency shift issues and making it difficult to meet precise frequency requirements. Finally, in traditional cavity designs, the height of components such as the inner rod may exceed the cavity, requiring holes to be drilled in the magnets, which could interfere with the magnetic field of the cyclotron.

[0004] These drawbacks are particularly pronounced in compact superconducting cyclotrons, limiting their application in isotope production. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to solve the technical challenges of high-frequency systems in large superconducting cyclotron accelerators under high-energy, high-current conditions, particularly the problems of large size, increased weight, insufficient structural stability, and frequency shifts caused by manufacturing errors in the large-scale design of traditional cavities. This invention proposes a compact superconducting cyclotron accelerator cavity for isotope production. By optimizing the structural design, the stability and frequency adjustment range of the cavity are improved, meeting the requirements of isotope production.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A compact superconducting cyclotron accelerator cavity for isotope production includes: The shell consists of a symmetrical spiral upper shell plate and a lower shell plate. The head of the shell has a small-radius magnetic pole, and the tail of the shell has a large-radius magnetic pole. The Dee plate is arranged parallel to the upper and lower shell plates and is located between the upper and lower shell plates. The Dee plate includes an upper Dee plate and a lower Dee plate that are symmetrically arranged. Head connecting block: The head connecting block is located at the head of the Dee board and connects to the upper Dee board and the lower Dee board. Tail connecting block: The tail connecting block is located at the tail of the Dee board and connects to the upper Dee board and the lower Dee board. The skeleton is set between the upper and lower Dee boards to support them, and the surface of the skeleton is covered with a panel. The inner rod connects the shell and the Dee plate. The inner rod has a symmetrical structure and includes a first inner rod and a second inner rod that are spaced apart. Fixed capacitor tuner, the fixed capacitor tuner is mounted on the housing, near the tail of the Dee board; The movable capacitor tuner is mounted on the housing, near the head of the Dee board. The movable capacitor tuner consists of two symmetrical movable capacitor tuners, one above the other, and each movable capacitor tuner is connected to a motor. Coupler, the coupler is mounted on the housing.

[0007] Preferably, the lower Dee plate is fixedly connected to the head connecting block, the upper Dee plate is movably connected to the head connecting block by a spring, the upper Dee plate is fixedly connected to the tail connecting block, and the lower Dee plate is movably connected to the tail connecting block by a spring.

[0008] Preferably, the spring is a high-frequency spring, which utilizes the slight sag due to gravity to enhance structural stability.

[0009] Preferably, the height of the first inner rod is equal to the height of the second inner rod and consistent with the height of the cavity, so as to reduce the interference of the opening on the magnetic field of the cyclotron.

[0010] Preferably, the cross-sectional shape of the inner rod is "racetrack-like" to enhance support.

[0011] Preferably, by adjusting the number, position, and size of the inner rods, the cavity is optimized to the required frequency and voltage distribution during simulation.

[0012] Preferably, one to three fixed capacitor tuners are provided for coarse frequency adjustment to correct frequency shifts caused by processing errors during cold testing of the cavity.

[0013] Preferably, two symmetrically positioned movable capacitor tuners are provided for dynamic fine-tuning of the frequency to ensure that the cavity tuning accuracy and frequency stability requirements are met.

[0014] Preferably, water channels are distributed throughout the housing, Dee plate, fixed capacitor tuner, movable capacitor tuner, and coupler to reduce cavity frequency drift caused by thermal deformation.

[0015] Preferably, the height of the shell is reduced at the magnetic pole of its large radius valley region, so that the tail of the shell is symmetrically recessed towards the middle by one-third on both the upper and lower sides.

[0016] The present invention has the following advantages due to the adoption of the above technical solutions: This invention solves the problems of large size, increased weight, insufficient structural stability, and frequency shift caused by processing errors in traditional cavity designs by optimizing the structural design of the high-frequency cavity. It is particularly suitable for superconducting cyclotron accelerators under high-energy and high-current conditions.

[0017] This invention provides an efficient and stable cavity solution for high-energy, high-current cyclotron accelerators. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings: Figure 1 This is a schematic diagram of the cavity structure according to an embodiment of this application; Figure 2 This is a cross-sectional view of the cavity and the head of the Dee plate according to an embodiment of this application; Figure 3 This is a schematic diagram of a Dee board support according to an embodiment of this application; Figure 4 This is a cross-sectional view of the tail section of the Dee board and the connecting block according to an embodiment of this application; Figure 5 This is a cross-sectional view of a Dee plate according to an embodiment of this application.

[0019] The markings in the attached diagram are as follows: Casing 1 Dee Board 2 Tail connecting block 3 First inner rod 4 Second inner rod 5 Fixed capacitor tuner 6 Moving capacitor tuner 7 Coupler 8 Frame 9 Spring 10 Apply panel 11 Head Connector Block 12 Electrode 13 Detailed Implementation Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art. In the following, although examples of this disclosure will be described in detail with reference to the accompanying drawings, it should be noted that the examples are not limited thereto.

[0020] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents to the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein, except for operations that must occur in a specific order, as will become apparent upon understanding this disclosure. Furthermore, for clarity and brevity, descriptions of features well-known in the art may be omitted.

[0021] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein are provided merely to illustrate some of the many possible ways in which the methods, apparatuses, and / or systems described herein will become apparent upon understanding this disclosure.

[0022] Throughout this specification, when an element is described as being "on," "connected to," or "attached to" another element, the element may be directly "on," directly "connected to," or directly "attached to" the other element, or there may be one or more other elements between the element and the other element. Conversely, when an element is described as being "directly on," "directly connected to," or "directly attached to" another element, there are no other elements between the element and the other element.

[0023] As used herein, the term “and / or” includes any one of the associated listed items and any combination of any two or more items; similarly, “at least one” includes any one of the associated listed items and any combination of any two or more items.

[0024] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections are not limited by these terms. Rather, these terms are used only to distinguish one component, part, region, layer, or section from another. Therefore, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in these examples may also be referred to as a second component, second part, second region, second layer, or second section.

[0025] Spatial relative terms such as “above,” “above,” “below,” and “below” may be used herein for descriptive convenience to describe the relationship of one element relative to another, as shown in the accompanying drawings. In addition to covering the orientation depicted in the drawings, these spatial relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” another element would be located “below” or “below” that other element. Thus, depending on the spatial orientation of the device, the term “above” covers both orientations of “above” and “below”. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0026] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the terms “a,” “an,” and “the” are intended to include the plural form as well. The terms “comprising,” “including,” and “having” indicate the presence of the stated features, numbers, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, components, elements, and / or combinations thereof.

[0027] Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures, but include shape variations that may occur during manufacturing.

[0028] It should be noted that in this document, the term "may" is used relative to examples, such as regarding what an example may include or implement, meaning that there exists at least one example that includes or implements such a feature, but not all examples are limited to this.

[0029] The features of the examples described herein can be combined in various ways that will become apparent upon understanding this disclosure. Furthermore, although the examples described herein have multiple configurations, other configurations that will become apparent upon understanding this disclosure are also possible.

[0030] The cavity of the present invention comprises the following components: 1. Housing, 2. Dee plate, 12. Head connecting block, 3. Tail connecting block, 9. Frame, 11. First inner rod, 4. Second inner rod, 5. Fixed capacitor tuner, 6. Moving capacitor tuner, 7. Coupler, 8.

[0031] The housing 1 is a spiral grounding cavity with symmetrical upper and lower parts.

[0032] Dee plate 2 is a spiral plate-shaped object with symmetrical top and bottom.

[0033] The heads of the vertically symmetrical spiral Dee plates 2 are connected by a head connecting block 12, and the tails of the vertically symmetrical spiral Dee plates 2 are connected by a tail connecting block 3.

[0034] The spiral Dee plate 2, which is symmetrical from top to bottom, is supported by the frame 9.

[0035] A dressing panel 11 is applied to the surface of the skeleton.

[0036] The housing 1 and the Dee plate 2 are connected by inner rods, which have a symmetrical structure. There can be multiple inner rods. In one embodiment of the present invention, a first inner rod 4 and a second inner rod 5 are provided.

[0037] The fixed capacitor tuner 6 is mounted on the housing 1, near the tail of the Dee board 2.

[0038] The movable capacitor tuner 7 is mounted on the housing 1, near the head of the Dee plate 2. In one embodiment of the invention, two movable capacitor tuners 7 are provided symmetrically, one above the other, and each movable capacitor tuner 7 is connected to a motor.

[0039] In one embodiment of the present invention, a coupler 8 is also provided on the housing 1.

[0040] like Figure 1 As shown, the housing 1 adopts a symmetrical spiral shape to form a cavity, so as to make full use of the valley space of the magnet to set up the cavity.

[0041] In one embodiment of the present invention, the cavity is a high-frequency cavity.

[0042] An opening is provided on the housing 1, which is positioned at the upper and lower parts of the cavity. The opening for the inner rod is shaped like a racetrack, and the opening for the movable capacitor tuner 7 and coupler 8 is circular.

[0043] To prevent excessive thermal deformation of the cavity due to temperature rise, which could cause frequency drift, a water channel needs to be installed along the edge of the acceleration gap in the cavity.

[0044] The water channel is mainly used to cool the inner rod and the coupler. It can be set at the opening for the inner rod and the opening for the coupler to reduce the temperature rise of the cavity.

[0045] To meet the structural requirements of the cavity, the thickness of the copper plate on the side of the symmetrical spiral grounding housing 1 is 8mm to enhance the overall rigidity of the cavity.

[0046] like Figure 2 As shown, the housing 1 located at the head of the upper half of the cavity is movably connected to the electrode 13 in the central region via a spring 10. The housing 1 located at the head of the lower half of the cavity is fixedly connected to the electrode 13 in the central region. This facilitates cavity assembly and allows the electrode 13 in the central region to be replaced at any time according to the physical design requirements of the central region to achieve the high-current injection requirement.

[0047] To facilitate beam extraction, the height of the magnetic poles in the large-radius valley region of the accelerator is reduced, resulting in a symmetrical one-third indentation on both the upper and lower sides of the cavity tail towards the middle. The thickness of the copper plate parallel to the indentation is 12mm, and it can also serve as a support for the cavity to enhance structural stability.

[0048] like Figure 2 As shown, the head connecting block 12 is fixedly connected to the lower Dee plate in the Dee plate 2, and the head connecting block 12 is movably connected to the upper Dee plate in the Dee plate 2 by a spring 10 to adapt to the shape of the Dee plate head designed separately for various working conditions.

[0049] Furthermore, according to the requirements of high-flow injection dynamics, the height of the upper and lower Dee plates in Dee plate 2 changes gradually from the small radius to the large radius. The height at the small radius changes from 15mm to 20mm, and the height at the large radius gradually changes from 20mm to 40mm.

[0050] like Figure 3 As shown, the spiral-shaped Dee plate 2 is fixed to the frame 9 by screws or welding.

[0051] In one embodiment of the present invention, the thickness of the skeleton 9 is 60 mm, and the surface of the skeleton 9 can be covered by the dressing panel 11.

[0052] The structural stability of the cavity can be ensured by optimizing the support structure of the skeleton 9, for example, by using titanium alloy or aluminum alloy materials to manufacture the skeleton 9.

[0053] Dee board 2 uses multiple water channels for independent cooling. The cooling water pipes are placed on Dee board 2 according to thermal simulation. Finally, the water pipes are concentrated at the two inner rods and enter and exit the cavity through the openings for the inner rods.

[0054] The first inner rod 4 and the second inner rod 5 are spaced apart. In one embodiment of the invention, the first inner rod 4 and the second inner rod 5 have the same cross-sectional shape and size. In another embodiment of the invention, the first inner rod 4 and the second inner rod 5 have different cross-sectional shapes and sizes.

[0055] like Figure 4 As shown, the tail connector 3 of the Dee board 2 can be replaced at any time according to assembly requirements.

[0056] In one embodiment of the present invention, the height of the tail connecting block 3 is 40 mm.

[0057] The upper Dee plate of Dee plate 2 is fixedly connected to the tail connecting block 3 by screws, and the lower Dee plate of Dee plate 2 is movably connected to the tail connecting block 3 by spring 10.

[0058] In one embodiment of the present invention, the spring 10 is a high-frequency spring. In another embodiment of the present invention, the spring 10 is a high-frequency spring that utilizes gravity for slight downward compression to enhance structural stability.

[0059] like Figure 4 As shown in the magnified portion A, the high-frequency spring can use a "β-shaped" spring to increase the spring compression and enhance high-frequency contact.

[0060] like Figure 5 As shown, the Dee board 2 is 70mm high and has a "trapezoidal" shape to leave design space for the frame 9, enhance the structural rigidity of the Dee board 2, reduce the deformation of the tail of the Dee board 2, and optimize the local electric field by chamfering to reduce the risk of arcing.

[0061] One part of the symmetrical double inner rods is fixedly connected to the housing 1 of the cavity, and the other part of the symmetrical double inner rods is fixedly connected to the Dee plate 2.

[0062] The inner rod has a "racetrack-like" structure, which not only enhances the structural support and optimizes the voltage distribution, but also serves as a water-cooling channel, concentrating the water-cooling pipes of the Dee board 2 and allowing them to enter and exit through the "racetrack-like" opening.

[0063] The water channels of the inner rod can be integrated into the "racetrack-shaped" structure and cooled by methods such as flooding.

[0064] Because the width of the Dee board with a small radius is small, a relatively small inner rod is set at the small radius and a relatively large inner rod is set at the large radius. This helps to adjust the voltage at the head of the cavity and strengthens the support structure.

[0065] In addition, the heights of the first inner rod 4 and the second inner rod 5 are equal and consistent with the height of the cavity, thus avoiding the need to make holes in the magnets and reducing interference with the magnetic field of the cyclotron.

[0066] By adjusting the number, position, and size of the internal rods, the cavity can be optimized to the required frequency and voltage distribution during simulation, resulting in a voltage distribution with low voltage at small radii and high voltage at large radii, thus meeting the physical requirements of the accelerator.

[0067] The cavity contains multiple fixed capacitor tuners 6 and two movable capacitor tuners 7.

[0068] The fixed capacitor tuner 6 is connected to the tail of the spiral grounding cavity.

[0069] One to three fixed capacitor tuners 6 can be set. During cold testing in the factory, the frequency can be coarsely tuned by adjusting the size of the tuner and its distance from the tail of the Dee board 2. Frequency tuning with a bandwidth of at least 500kHz can be achieved to correct frequency errors caused by processing, thereby ultimately determining the size and position of the fixed capacitor tuner 6.

[0070] The two movable capacitor tuners 7 can be configured to be connected symmetrically to the spiral grounding cavity.

[0071] Each of the two movable capacitor tuners 7 is connected to an external servo motor, allowing for a wide range of vertical movement. The servo motors are linear motor modules, controlled by drivers to move the movable capacitor tuners 7 vertically with a movement accuracy of 0.01 mm and a tuning accuracy of at least 0.05 kHz.

[0072] Frequency tuning with a bandwidth of at least 300kHz can be achieved when the distance between the movable capacitor tuner 7 and the Dee board 2 is moved within the range of 30mm-100mm.

[0073] During actual operation of the cavity, dynamic fine-tuning of the frequency can be achieved by adjusting the distance between the movable capacitor tuner 7 and the Dee board 2 to ensure that the cavity tuning accuracy and frequency stability requirements are met.

[0074] Both the fixed capacitor tuner 6 and the movable capacitor tuner 7 require water cooling. The cooling water is used to irrigate the fixed capacitor tuner 6 and the movable capacitor tuner 7 through the support rod.

[0075] The cavity adopts independent coupling. The coupler 8 is embedded at the tail of the upper part of the cavity. By adjusting the area of ​​the coupling ring of the coupler 8 and by rotating the angle of the coupler 8, impedance matching between the transmission line and the cavity can be achieved, so that the cavity reaches critical coupling.

[0076] When the input power is high, the heat generated by the coupler 8 itself cannot be ignored. Water cooling needs to be placed inside the coupling ring of the coupler 8 and on the coupler 8 itself to ensure the stable operation of the coupler 8. According to one embodiment of the present invention, it is possible to design high-frequency cavities with frequencies of 30 to 150 MHz, unloaded quality factors greater than 10000, and tuning frequencies greater than 800 kHz.

[0077] By optimizing the cavity structure, the compact superconducting cyclotron accelerator cavity for isotope production according to an embodiment of the present invention improves structural stability, can significantly correct frequency shifts caused by processing errors, and provides a guarantee for the long-term stable operation of the cavity.

[0078] Key points of this invention: The recessed design at the tail of the cavity: meets the shape requirements of the magnet's tail and enhances structural stability.

[0079] The spiral-shaped Dee board 2 has a "trapezoidal" structural design: it leaves design space for the frame 9. The Dee board 2 and the frame 9 are fixed together by welding or screws. The structure and material of the frame (using titanium alloy or aluminum alloy) can be adjusted according to needs to enhance the structural rigidity of the Dee board 2, reduce tail deformation, and optimize the local electric field through rounded corners to reduce the risk of arcing.

[0080] Movable connection design: The head connecting block 12 is movably connected to the upper Dee plate of Dee plate 2 by a high-frequency spring, and the tail connecting block 3 is movably connected to the lower Dee plate of Dee plate 2 by a high-frequency spring. This design can adapt to the shape of the head of Dee plate 2, which is designed separately under various working conditions, and uses gravity to slightly sag to enhance structural stability.

[0081] The "racetrack-shaped" structural design with symmetrical inner rods: Employing one or more inner rods of equal height, consistent with the cavity height, reduces interference from openings on the cyclotron's magnetic field. Simultaneously, the "racetrack-shaped" inner rod structure enhances support. Furthermore, by adjusting the number, position, and size of the inner rods, the cavity can be optimized to the desired frequency and voltage distribution during simulation.

[0082] The dual-stage tuning system design employs a combination of a fixed tail capacitor tuner 6 and two symmetrically positioned movable capacitor tuners 7. One to three fixed capacitor tuners 6 are needed for coarse frequency tuning, correcting frequency shifts caused by manufacturing errors during cold testing of the cavity. The two symmetrically positioned movable capacitor tuners 7 are used for fine frequency tuning, enabling dynamic adjustment to ensure the cavity tuning accuracy and frequency stability requirements are met. The dual-stage tuning system provides a frequency tuning bandwidth of at least 800kHz, ensuring the cavity frequency accurately meets requirements.

[0083] Full-area water cooling design: To prevent excessive thermal deformation of the cavity caused by temperature rise, water channels are distributed throughout the shell 1, Dee plate 2, tuner, coupler 8 and other components to reduce cavity frequency drift caused by thermal deformation.

[0084] This invention allows for the design of cavities with frequencies of 30 to 150 MHz, an unloaded quality factor greater than 10,000, and a tuning frequency greater than 800 kHz to meet the requirements of high-energy, high-current acceleration.

[0085] While specific examples have been shown and described above, it will be apparent upon understanding this disclosure that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood in a descriptive sense only and not for limiting purposes. The description of features or aspects in each example should be considered applicable to similar features or aspects in other examples. Suitable results may still be achieved if the described techniques are performed in a different order, and / or if components in the described system, architecture, device, or circuit are combined in different ways and / or replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in this disclosure.

[0086] 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 compact superconducting cyclotron accelerator cavity for isotope production, characterized in that, include: The housing includes a spiral upper plate and a lower plate that are symmetrically arranged vertically. The head of the housing is a small-radius magnetic pole, and the tail of the housing is a large-radius magnetic pole. The Dee plate is arranged parallel to the upper shell plate and the lower shell plate, and is located between the upper shell plate and the lower shell plate. The Dee plate includes an upper Dee plate and a lower Dee plate that are symmetrically arranged vertically. A head connecting block is disposed at the head of the Dee board and connected to the upper Dee board and the lower Dee board; A tail connector is disposed at the tail of the Dee board and connected to the upper Dee board and the lower Dee board; A frame, disposed between the upper Dee plate and the lower Dee plate to support the upper Dee plate and the lower Dee plate, and a covering panel is provided on the surface of the frame; The inner rod connects the housing and the Dee plate. The inner rod has a symmetrical structure and includes a first inner rod and a second inner rod spaced apart from each other. A fixed capacitor tuner is disposed on the housing near the tail of the Dee board; A movable capacitor tuner is mounted on the housing near the head of the Dee board. The movable capacitor tuner includes two symmetrical movable capacitor tuners, each connected to a motor. A coupler, the coupler being disposed on the housing; The lower Dee plate is fixedly connected to the head connecting block, the upper Dee plate is movably connected to the head connecting block by a spring, the upper Dee plate is fixedly connected to the tail connecting block, and the lower Dee plate is movably connected to the tail connecting block by a spring. The height of the first inner rod is equal to the height of the second inner rod and is consistent with the height of the cavity, so as to reduce the interference of the opening on the magnetic field of the cyclotron. The height of the shell decreases at the magnetic poles in its large-radius valley region, causing the tail of the shell to be symmetrically recessed towards the middle by one-third on both the upper and lower sides.

2. A compact superconducting cyclotron accelerator cavity for isotope production according to claim 1, characterized in that, The spring is a high-frequency spring, which utilizes gravity to slightly sag to enhance structural stability.

3. A compact superconducting cyclotron accelerator cavity for isotope production according to claim 1, characterized in that, The cross-sectional shape of the inner rod is "racetrack-like" to enhance its support.

4. A compact superconducting cyclotron accelerator cavity for isotope production according to claim 1, characterized in that, By adjusting the number, position, and size of the inner rods, the cavity can be optimized to the required frequency and voltage distribution during simulation.

5. A compact superconducting cyclotron accelerator cavity for isotope production according to claim 1, characterized in that, One to three fixed capacitor tuners are provided for coarse frequency tuning to correct frequency shifts caused by machining errors during cavity cold testing.

6. A compact superconducting cyclotron accelerator cavity for isotope production according to claim 1, characterized in that, Two symmetrically positioned movable capacitor tuners are used for dynamic frequency fine-tuning to ensure that the cavity tuning accuracy and frequency stability requirements are met.

7. A compact superconducting cyclotron accelerator cavity for isotope production according to claim 1, characterized in that, Water channels are distributed throughout the housing, the Dee plate, the fixed capacitor tuner, the movable capacitor tuner, and the coupler to reduce cavity frequency drift caused by thermal deformation.

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