A frequency modulation structure

Abstract

This utility model discloses a frequency modulation structure, including a disk-loaded waveguide resonant unit, a frequency modulation bolt mounting cavity, and a frequency modulation bolt positioning seat. Multiple frequency modulation bolt mounting cavities are axially and equidistantly spaced on the outer edge of the disk-loaded waveguide resonant unit. Each frequency modulation bolt mounting cavity contains at least one frequency modulation bolt positioning seat, which is used to mate with the frequency modulation bolt. This utility model integrates the frequency modulation bolt mounting cavity and the frequency modulation bolt positioning seat within the side-mounted frequency modulation resonator, eliminating the need for welding and splicing the two-part split structure of existing technologies. It eliminates the need for high-precision alignment welding, fundamentally eliminating the potential for precision deviations caused by welding, reducing processing difficulty and assembly errors. When subsequently fitted with frequency modulation screws, the integrated mounting cavity and positioning seat ensure smooth screw insertion, uniform force distribution, and stable screw tightening resistance, effectively avoiding problems such as abnormal screw installation and frequency modulation failure caused by welding deviations in split structures.

Description

Technical Field

[0001] This utility model mainly relates to the field of accelerator tube technology, specifically a frequency modulation structure. Background Technology

[0002] Accelerator tubes are the core components of particle accelerators used to accelerate charged particles. They form a high-intensity, high-stability electromagnetic field through a specific structure, which enables charged particles to gain energy under the action of electric field force, realizing the acceleration process from a low energy state to a high energy state. They are a key component of particle accelerators such as medical linear accelerators and industrial flaw detection equipment.

[0003] The disk-loaded waveguide resonant unit is the basic functional unit constituting the disk-loaded waveguide structure in the accelerator tube. It forms a resonant space through a specific cavity shape, which can optimize the electromagnetic field distribution, improve the effective shunt impedance of the accelerator structure, and thus improve the microwave power conversion rate. It is a core component for the accelerator tube to achieve efficient particle acceleration. The existing frequency modulation method is to apply an external force to the cavity of the resonant unit to cause a slight deformation to adjust the resonant frequency. However, in the existing structure, the frequency modulation screw installation part adopts a two-half design, which requires welding splicing. This will result in extremely high precision alignment during welding. Otherwise, splicing deviation is easy to occur, which will make the subsequent frequency modulation screw installation difficult and uneven force, resulting in abnormal frequency modulation resistance, mismatch between adjustment stroke and frequency change, and damage to frequency modulation accuracy. Utility Model Content

[0004] This utility model addresses the problem of overly simplistic solutions in existing technologies by providing a frequency modulation structure. This structure solves the problem mentioned in the background section where the two halves of the frequency modulation screw mounting part require welding and splicing. This welding is prone to deviation due to insufficient precision, resulting in poor installation of the frequency modulation screw, uneven stress, and consequently compromising the accuracy of frequency modulation.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A frequency modulation structure includes a disk-loaded waveguide resonant unit, a frequency modulation bolt mounting cavity, and a frequency modulation bolt positioning seat. The outer edge of the disk-loaded waveguide resonant unit has multiple frequency modulation bolt mounting cavities equidistantly spaced along its axial direction. Each frequency modulation bolt mounting cavity has at least one frequency modulation bolt positioning seat inside, which is used to cooperate with the frequency modulation bolt.

[0007] Furthermore, the disk-loaded waveguide resonant unit includes a curved cavity extending along the axis and a side-mounted frequency-modulated resonant cavity enclosed by the outer edge. The curved cavity is symmetrically opened on both sides of the disk-loaded waveguide resonant unit and extends axially. The side-mounted frequency-modulated resonant cavity is formed by the solid region of the disk-loaded waveguide resonant unit.

[0008] Furthermore, the frequency modulation bolt mounting cavity and frequency modulation bolt positioning seat for mounting the frequency modulation component are integrated within the side frequency modulation resonant cavity and are evenly distributed circumferentially along the outer edge of the side frequency modulation resonant cavity.

[0009] Furthermore, the curved cavity has a bowl-shaped structure with a wider outer section and a narrower inner section along the axial direction. The curved cavities on both sides of the disk-loaded waveguide resonator unit are interconnected along the axis. After multiple disk-loaded waveguide resonator units are coaxially connected through the curved cavities in sequence, the interconnected curved cavities together form an acceleration channel for transmitting charged particle beams.

[0010] Furthermore, the frequency tuning bolt mounting cavity and the frequency tuning bolt positioning seat are arranged at an angle within the side frequency tuning resonant cavity. The angle of both is adapted to the curved surface features of the curved cavity. The axial direction of the frequency tuning bolt mounting cavity and the force-bearing end face of the frequency tuning bolt positioning seat are perpendicular to the local normal direction of the curved cavity, so that the frequency tuning component applies force in a direction perpendicular to the force-bearing surface of the curved cavity.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This novel frequency modulation structure integrates the frequency modulation bolt mounting cavity and the frequency modulation bolt positioning seat into the side frequency modulation resonator through an integrated design. This eliminates the need for welding and splicing of the two-part split structure in existing technologies. Compared with traditional structures, it eliminates the need for high-precision alignment welding, thus removing the potential for precision deviation caused by welding. This reduces processing difficulty and assembly errors. Furthermore, when used with frequency modulation screws, the integrated mounting cavity and positioning seat ensure smooth screw insertion, uniform force distribution, stable screw tightening resistance, and precise matching of adjustment stroke and frequency change. This effectively avoids problems such as abnormal screw installation and frequency modulation failure caused by welding deviations in split structures, ensuring the accuracy and stability of the frequency modulation process.

[0013] 2. The disk-loaded waveguide resonant unit adopts a bowl-shaped curved cavity with a cross-section that is wider on the outside and narrower on the inside, which runs through the axis. Multiple units can be coaxially connected sequentially through this curved cavity. When multiple units are spliced, the bowl-shaped structure achieves precise guidance and adaptation by virtue of its outer width and inner narrowing shape, which simplifies the splicing process and improves the coaxiality of the connection, ensuring the formation of a continuous and smooth acceleration channel, which is conducive to the stable transmission of charged particle beams.

[0014] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the disk-loaded waveguide resonant unit of this utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the disk-loaded waveguide resonant unit of this utility model;

[0017] Figure 3 This is a schematic diagram of the application structure of the frequency modulation bolt mounting cavity and frequency modulation bolt positioning seat of this utility model;

[0018] Figure 4 This is a schematic diagram of the main structure of an existing disk-loaded waveguide resonant unit;

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of an existing disk-loaded waveguide resonant unit.

[0020] Numbering on the map:

[0021] 1. Disc-loaded waveguide resonant unit; 101. Curved cavity; 102. Side-mounted frequency-modulated resonant cavity; 2. Frequency-modulated bolt mounting cavity; 3. Frequency-modulated bolt positioning seat. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0024] Please refer to the appendix carefully. Figure 1-5 A frequency modulation structure includes a disk-loaded waveguide resonant unit 1, a frequency modulation bolt mounting cavity 2, and a frequency modulation bolt positioning seat 3. Multiple frequency modulation bolt mounting cavities 2 are axially and equidistantly opened on the outer edge of the disk-loaded waveguide resonant unit 1. Each frequency modulation bolt mounting cavity 2 is provided with at least one frequency modulation bolt positioning seat 3, which is used to cooperate with the frequency modulation bolt.

[0025] In this embodiment, as Figure 1 and Figure 2 As shown, the disk-loaded waveguide resonant unit 1 includes a curved cavity 101 extending along the axis and a side-mounted frequency-modulated resonant cavity 102 enclosed by the outer edge. The curved cavity 101 is symmetrically opened on both sides of the disk-loaded waveguide resonant unit 1 and extends axially. The side-mounted frequency-modulated resonant cavity 102 is formed by the solid region of the disk-loaded waveguide resonant unit 1.

[0026] With the above structure, the curved cavity 101 is symmetrically connected to both sides of the disk-loaded waveguide resonant unit 1, and together with the side frequency-modulated resonant cavity 102, it forms a complete resonant system. This not only ensures the continuity of the charged particle beam transmission channel, but also allows the side frequency-modulated resonant cavity 102 to respond more directly to the frequency modulation operation, resulting in higher frequency adjustment efficiency and more uniform electric field distribution.

[0027] In this embodiment, as Figure 2 As shown, the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 for installing the frequency modulation component are integrated in the side frequency modulation resonant cavity 102 and are evenly distributed along the outer edge of the side frequency modulation resonant cavity 102.

[0028] With the above structure, compared to the existing two-part structure where the frequency modulation component is separately installed and requires welding and splicing (as shown in the attached diagram), Figure 4 and Figure 5 This structure integrates the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 into the side frequency modulation resonant cavity 102 and distributes them evenly in the circumference. The integrated design completely eliminates the precision deviation risk caused by welding in the split structure. There is no need to perform complex alignment welding process on the frequency modulation components, which reduces the processing difficulty and assembly error. The even distribution in the circumference avoids the problem of uneven distribution of frequency modulation force in the two-half structure. It can make the force of the frequency modulation component on the side frequency modulation resonant cavity 102 evenly transmitted in the circumference, ensuring that the cavity shape changes regularly and the frequency adjustment is more accurate and stable, thus improving the overall performance and service life of the resonant unit.

[0029] In this embodiment, as Figure 1 As shown, the curved cavity 101 has a bowl-shaped structure with a wider outer section and a narrower inner section along the axial direction. The curved cavities 101 on both sides of the disk-loaded waveguide resonant unit 1 are interconnected along the axis. After multiple disk-loaded waveguide resonant units 1 are coaxially connected through the curved cavities 101, the interconnected curved cavities 101 together form an acceleration channel for transmitting charged particle beams.

[0030] With the above structure, when multiple disk-loaded waveguide resonant units 1 are coaxially connected, the curved cavity 101 can achieve precise guidance and adaptation by utilizing its own structure, simplify the splicing process, improve the coaxiality of the connection, and ensure that a continuous and smooth acceleration channel is formed after the phase is connected, which is conducive to the stable transmission of charged particle beams. The bowl-shaped structure can optimize the electric field distribution and increase the effective action space.

[0031] In this embodiment, as Figure 2 As shown, the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 are arranged at an angle in the side frequency modulation resonant cavity 102. The angle of both is adapted to the curved surface features of the curved cavity 101. The axial direction of the frequency modulation bolt mounting cavity 2 and the force-bearing end face of the frequency modulation bolt positioning seat 3 are perpendicular to the local normal direction of the curved cavity 101, so that the frequency modulation component applies force in a direction perpendicular to the force-bearing surface of the curved cavity 101.

[0032] Through the above structure, the inclined layout of the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 in the side frequency modulation resonant cavity 102 in this new frequency modulation structure has multiple advantages: the inclined direction of the two allows the frequency modulation component to apply force precisely along the direction perpendicular to the force-bearing surface of the curved cavity 101, which can produce directional and controllable elastic deformation, realize high-precision and linear adjustment of the resonant frequency, and avoid force dispersion and deviation. At the same time, this inclined layout adapted to the curved surface characteristics can effectively avoid problems such as structural stress concentration caused by improper force application direction during frequency modulation, and ensure the stability and reliability of frequency modulation operation.

[0033] In another embodiment, such as Figure 3 As shown, the integrated design of the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 of this utility model can be extended to non-circular (irregular shape) resonant unit modules, in order to... Figure 3 Taking a single irregular resonant unit module structure as an example, the module also has a bowl-shaped cavity inside, which serves as an acceleration channel for the transmission of charged particle beams, ensuring particle acceleration efficiency and microwave energy coupling effect. The frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 are integrated into the module resonant cavity area (functionally equivalent to the side frequency modulation resonant cavity 102). The force-bearing end faces of the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 are also perpendicular to the local normal of the bowl-shaped cavity, ensuring that the force direction of the frequency modulation component is precise and controllable.

[0034] The specific operating procedure of this utility model is as follows: (as shown in the appendix) Figure 4 and Figure 5 The disk-loaded waveguide resonant unit 1 adopts a two-part split cavity structure. The frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 are not only coaxial with the unit axis, but are also two-part designs themselves. Although an attempt was made to optimize the structure by connecting the two arcs, which to some extent made the inner arc processing easier and improved the cavity connection, the subsequent welding process is much more difficult because the mounting cavity and the positioning seat are still separate. High-precision alignment is required to ensure coaxiality. If the two-part mounting cavity and the positioning seat (functionally equivalent to the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3) cannot be precisely aligned, there will be a deviation after the two are spliced. When installing the frequency modulation screw later, this deviation in the early welding will cause the screw to not be able to be installed smoothly and the force after installation to be uneven. This will lead to abnormal screw turning resistance and mismatch between the adjustment stroke and frequency change during the frequency modulation process, which will destroy the accuracy and stability of the frequency modulation.

[0035] In this frequency modulation structure, the disk-loaded waveguide resonant unit 1 integrates an inclined, one-piece frequency modulation bolt mounting cavity 2 and a frequency modulation bolt positioning seat 3. Multiple units are coaxially connected through the structure of the arc-shaped bowl-shaped cavity 101, which is wider on the outside and gradually narrows on the inside, forming a smooth acceleration channel inside. This reduces particle transmission loss and maximizes the inner radius of the bowl, improving the effective shunt impedance and microwave power conversion rate. During welding, since the frequency modulation bolt mounting cavity 2 and the frequency modulation bolt positioning seat 3 are one piece, there is no need for high-precision alignment welding as required by separate structures. This avoids the hidden dangers of welding deviation and reduces the welding difficulty and precision requirements. When used with frequency modulation screws, the screws are inserted smoothly and the force is even. The screw turning resistance is stable, and the adjustment stroke is precisely matched with the frequency change, ensuring the accuracy and stability of frequency modulation. This avoids problems such as abnormal screw installation and frequency modulation failure caused by welding deviation in separate structures. During long-term operation, it is not easy for components to loosen or be damaged due to stress concentration. It strongly supports the stable and efficient operation of the accelerator tube. From welding and frequency modulation to particle acceleration, it achieves comprehensive improvement in "easy processing, easy assembly, high precision, and high performance".

[0036] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A frequency modulation structure, comprising a disk-loaded waveguide resonator unit (1), a frequency modulation bolt mounting cavity (2) and a frequency modulation bolt positioning seat (3), characterized in that: The outer edge of the disk-loaded waveguide resonant unit (1) is provided with multiple frequency tuning bolt mounting cavities (2) at equal intervals along the axial direction. Each frequency tuning bolt mounting cavity (2) is provided with at least one frequency tuning bolt positioning seat (3), which is used to cooperate with the frequency tuning bolt.

2. A frequency modulation structure according to claim 1, characterized in that: The disk-loaded waveguide resonant unit (1) includes a curved cavity (101) extending along the axis and a side-mounted frequency-modulated resonant cavity (102) enclosed by the outer edge. The curved cavity (101) is symmetrically opened on both sides of the disk-loaded waveguide resonant unit (1) and extends axially. The side-mounted frequency-modulated resonant cavity (102) is formed by the solid region of the disk-loaded waveguide resonant unit (1).

3. A frequency modulation structure according to claim 2, wherein: The frequency modulation bolt mounting cavity (2) and frequency modulation bolt positioning seat (3) for installing frequency modulation components are integrated in the side frequency modulation resonant cavity (102) and are evenly distributed along the outer edge of the side frequency modulation resonant cavity (102).

4. A frequency modulation structure according to claim 2, wherein: The curved cavity (101) has a bowl-shaped structure with a wider outer section and a narrower inner section. The curved cavities (101) on both sides of the disk-loaded waveguide resonant unit (1) are interconnected along the axis. After multiple disk-loaded waveguide resonant units (1) are coaxially connected through the curved cavities (101) in sequence, the interconnected curved cavities (101) together form an acceleration channel for transmitting charged particle beams.

5. The frequency modulation structure of claim 1, wherein: The frequency tuning bolt mounting cavity (2) and the frequency tuning bolt positioning seat (3) are arranged at an inclination in the side frequency tuning resonant cavity (102). The inclination direction of both is adapted to the curved surface features of the curved cavity (101). The axial direction of the frequency tuning bolt mounting cavity (2) and the force-bearing end face of the frequency tuning bolt positioning seat (3) are perpendicular to the local normal direction of the curved cavity (101) so that the frequency tuning component applies force in a direction perpendicular to the force-bearing surface of the curved cavity (101).

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