A high-frequency resonant device with a variable diameter helical wire

Abstract

This invention relates to a variable-diameter helical high-frequency resonant device, comprising: an inner conductor and a racetrack-shaped base. The inner conductor adopts a gradually changing diameter helical structure, including an oxygen-free copper gradually changing helical channel and a stainless steel gradually changing helical partition, with the stainless steel gradually changing helical partition disposed within the oxygen-free copper gradually changing helical channel; the racetrack-shaped base is welded to the inner conductor, and the edges, corners, and sharp corners of both the inner conductor and the racetrack-shaped base are chamfered. The inner conductor of the cavity employs a novel gradually changing diameter helical structure, which not only significantly reduces the cavity size but also ensures full contact between the helical inner conductor and the cavity base, enhancing the stability of the entire inner conductor structure.

Description

Technical Field

[0001] This invention relates to the field of high-frequency resonance, and more specifically to a high-frequency resonant device with a variable diameter helical wire. Background Technology

[0002] In recent years, linear accelerators have gradually replaced traditional cyclotron accelerators due to their advantages such as high acceleration gradient, high energy, high efficiency, excellent beam quality, and simple injection and extraction structures. They have become the primary injector system for medical heavy ion therapy synchrotrons and next-generation high-intensity heavy ion accelerators. Linear accelerators typically consist of a radio frequency quadrupole accelerator (RFQ), a bundler, a debuncher, and a drift tube linear accelerator (DTL). Depending on the different requirements for the final beam energy and quality, multiple bundler and debuncher cavities with different voltages are needed along the entire linear segment to perform beam focusing or debunching operations. Therefore, the bundler and debuncher systems have become important components of linear accelerators.

[0003] In order to improve beam energy and current intensity, medical heavy ion therapy linear accelerators require a small-sized, high-frequency voltage, and high-power Buncher and DeBuncher cavity system to focus or disperse the beam after it is accelerated through the high-energy linear section of the DTL cavity. This reduces beam energy dispersion at the DTL cavity exit and improves the transmission efficiency and longitudinal matching efficiency of subsequent beamlines. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a high-power variable-diameter spiral high-frequency resonant cavity and its power transmission device to achieve the design specifications required for the focuser cavity in a medical therapeutic heavy ion linear accelerator.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A variable diameter helical high-frequency resonant device, comprising:

[0007] The inner conductor adopts a gradually changing diameter helical structure, including an oxygen-free copper gradually changing helical channel and a stainless steel gradually changing helical baffle. The stainless steel gradually changing helical baffle is set inside the oxygen-free copper gradually changing helical channel; and

[0008] The racetrack-shaped base is welded to the inner conductor, and the edges, corners, and sharp corners of the inner conductor and the racetrack-shaped base are chamfered.

[0009] The variable diameter spiral high-frequency resonant device includes a high-frequency resonant cavity, on which a frequency fine-tuning component, a collimation reference target, a sampling port, a frequency coarse-tuning component, and a power coupler are sequentially arranged on the outer peripheral surface of the high-frequency resonant cavity.

[0010] On the inner circumferential surface of the high-frequency resonant cavity, there are sequentially arranged: a fine-tuning frequency rod, a coarse-tuning frequency capacitor plate, and a power coupler coupling ring.

[0011] The high-frequency resonant cavity also includes a three-dimensional adjustable support.

[0012] The inner conductor of the variable diameter spiral is formed by rotating a rectangular cross section. During the rotation, a variable diameter method is used, and the maximum rectangular cross section after the spiral diameter is changed is fully connected with the racetrack-shaped base.

[0013] The oxygen-free copper gradient spiral water channel is separated by a stainless steel spiral baffle into an inlet channel and an outlet channel for the inner conductor. The inlet and outlet channels of the inner conductor extend to the head of the spiral to ensure sufficient cooling of the entire inner conductor.

[0014] The water inlet and outlet channels of the inner conductor are connected to the racetrack-shaped base, and a cooling water pipe is connected from the bottom surface of the racetrack-shaped base to introduce water.

[0015] A high-frequency connecting spring ring and a vacuum sealing ring are installed on the racetrack-shaped base.

[0016] The variable diameter spiral high-frequency resonant device is connected to the radio frequency power source through a transmission feeder device.

[0017] The transmission feeder device includes:

[0018] Inner conductor ferrule;

[0019] The outer conductor and the inner conductor insert are located inside the outer conductor.

[0020] A coaxial rigid coaxial feed tube elbow is provided, with the feed tube connected to the feed port of the high-frequency cavity. A coaxial rigid feed tube insert is installed in the coaxial rigid coaxial feed tube elbow, and a coaxial rigid feed tube hose clamp and a coaxial rigid feed tube clamp are installed on the outside of the coaxial rigid coaxial feed tube elbow.

[0021] The present invention has the following advantages due to the adoption of the above technical solutions:

[0022] 1. The high-frequency resonant cavity provided by this invention employs a novel gradually varying diameter helical structure for its inner conductor. This structure not only significantly reduces the cavity size but also ensures full contact between the helical inner conductor and the cavity base, enhancing the stability of the entire inner conductor structure. The upper-variable helical inner conductor design successfully solves the problem of limited installation space in linear accelerator focuser cavities.

[0023] 2. The inner conductor of this invention is made of oxygen-free copper, and the high thermal conductivity of oxygen-free copper ensures effective cooling of the inner conductor.

[0024] 3. The high strength of the stainless steel partition of this invention effectively improves the thermal stability of the spiral inner conductor. Attached Figure Description

[0025] 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:

[0026] Figure 1 This is a schematic diagram of a power transmission device at any angle directly connected to a spiral high-frequency resonant cavity for power feeding.

[0027] Figure 2 This is a front view of the overall structure of the high-frequency resonant cavity;

[0028] Figure 3 This is a left view of the overall structure of the high-frequency resonant cavity;

[0029] Figure 4 This is a perspective view of the overall structure of the high-frequency resonant cavity;

[0030] Figure 5 This is a bottom view of the overall structure of the high-frequency resonant cavity;

[0031] Figure 6 This is a front view of the internal structure of a high-frequency resonant cavity with a variable diameter spiral.

[0032] Figure 7 This is a 3D diagram of the internal structure of a high-frequency resonant cavity with a variable diameter spiral.

[0033] Figure 8 This is a front view of the inner conductor of the variable diameter spiral high-frequency resonant cavity and its water-cooling structure.

[0034] Figure 9 This is a three-dimensional diagram of the inner conductor and water-cooling structure of a variable-diameter spiral high-frequency resonant cavity.

[0035] Figure 10 This is a three-dimensional diagram of the inner conductor and water-cooling structure of a variable-diameter spiral high-frequency resonant cavity.

[0036] Figure 11 This is a diagram of the inner conductor of the variable diameter spiral high-frequency resonant cavity and its water-cooling structure.

[0037] Figure 12 This is a schematic diagram of the arbitrary angle rotation component of the power transmission device in the structure of an arbitrary angle power transmission device;

[0038] Figure 13 This is a schematic diagram of the arbitrary angle horizontal rotation structure in the arbitrary angle power transmission device structure.

[0039] Figure 14This is a schematic diagram of a coaxial hard-feed right-angle bend in the structure of an arbitrary angle power transmission device;

[0040] Figure 15 This is a schematic diagram of the shaft-driven hard-feed right-angle elbow, insert, and clamp / hose structure in the structural diagram of an arbitrary angle power transmission device.

[0041] The markings in the attached diagram are as follows:

[0042] 1. Helical cavity; 2. Transmission pipeline; 3. Power source; 4. Frequency coarse adjustment component; 5. Power coupler; 6. Inner conductor cooling water pipe; 7. Side plate cooling water pipe; 8. Sampling port; 9. Vacuum pump interface; 10. Cavity; 11. Right side end plate; 12. Three-dimensional adjustable support; 13. Left side end plate; 14. Power coupling interface; 15. Collimation reference target base; 16. Frequency fine adjustment component; 17. Frequency fine adjustment rod; 18. Gradually changing diameter helical inner conductor; 19. Racetrack-shaped base; 20. Frequency coarse adjustment capacitor plate; 21. Power coupler coupling ring; 22. Drift tube; 23. 24. Vacuum sealing ring; 27. High-frequency sealing ring; 28. Open end of inner conductor; 29. ​​Chamfered structure of inner conductor; 30. Chamfered structure of racetrack-shaped base; 31. High-frequency connecting spring ring of racetrack-shaped base; 32. Stainless steel partition structure; 33. Oxygen-free copper inner conductor; 34. Cooling water inlet channel of oxygen-free copper inner conductor; 35. Cooling water outlet channel of oxygen-free copper inner conductor; 46. Inner conductor insert; 47. Outer conductor; 48. Corner component; 49. Flange; 40. Right angle elbow of coaxial rigid feeder pipe; 41. Insert structure of coaxial rigid feeder pipe; 42. Hose clamp structure of coaxial rigid feeder pipe; 43. Clamping structure of coaxial rigid feeder pipe. Detailed Implementation

[0043] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can 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 the invention and to fully convey the scope of the invention to those skilled in the art.

[0044] According to this application, a helical high-frequency resonant cavity and its power transmission line adopt a gradually changing diameter helical structure, which can effectively reduce the volume of the high-frequency resonant cavity and save installation space. The cooling structure of the cavity helical line has been specially designed, which greatly improves the cooling efficiency of the cavity, enabling the cavity to maintain thermal stability under high power conditions, with small frequency drift and reliable overall operation. The power transmission line of this type of cavity has been redesigned, which reduces unnecessary multiple turns of the transmission line when the power feed of the cavity is in any angle direction, and has excellent power transmission matching parameters.

[0045] According to this application, the spiral high-frequency resonant cavity is a high-power gradually changing spiral structure cavity, wherein the spiral structure adopts a gradually changing diameter method. Based on the actual working characteristics of the resonant cavity, the spiral inner conductor is designed as a spiral structure with gradually increasing size (diameter or side length) from the open circuit end to the short circuit end.

[0046] According to the design of the spiral-shaped high-frequency resonant cavity in this application, both the inner conductor spiral and the racetrack-shaped base structure adopt a chamfering treatment, so that there are no edges, sharp corners and corners on the entire spiral inner conductor and the racetrack-shaped base, which effectively reduces the maximum power density of the entire inner conductor and the base surface.

[0047] The spiral-shaped high-frequency resonant cavity according to this application is a variable-diameter spiral structure cavity suitable for high-power operating conditions. This structure can greatly improve the output voltage of the resonant cavity. When operating at high power, the high heat generated by the resonant cavity is carried away in time by efficient water cooling, thus maintaining the thermal stability of the resonant cavity structure.

[0048] Based on the structural characteristics of the spiral high-frequency resonant cavity of this application, a power transmission system that can be directly matched and connected to a power source when the power feed port is oriented at any angle reduces the installation cost and complexity of the power transmission system and increases the stability and reliability of the transmission system.

[0049] This invention adopts the following technical solution: a high-power variable-diameter spiral high-frequency resonant cavity and its power transmission device, comprising:

[0050] The inner conductor of the cavity adopts a novel gradually tapered spiral structure. This structure not only significantly reduces the cavity size but also ensures full contact between the spiral inner conductor and the cavity base, enhancing the stability of the entire inner conductor structure. The gradually tapered spiral inner conductor design successfully solves the problem of limited installation space in the focuser cavity of a medical heavy ion therapy linear accelerator.

[0051] The inner conductor of a novel spiral high-frequency resonant cavity is the primary heat-generating component. Typically, this type of cavity uses stainless steel plated with copper to fabricate the inner conductor, with cooling channels inside the stainless steel to circulate cooling water at a certain flow rate. However, stainless steel is a poor conductor of heat, making this method unsuitable for high-power high-frequency resonant cavities. Copper, while possessing good thermal conductivity, is too soft and easily deformed to be processed into such a complex spiral structure. Addressing these contradictions and challenges, this application innovatively designs a spiral inner conductor welding structure combining an oxygen-free copper gradient spiral and a stainless steel gradient spiral partition. This fully utilizes the high thermal conductivity of oxygen-free copper to significantly improve the cavity's cooling efficiency, while leveraging the high strength of stainless steel to enhance the overall stability of the spiral inner conductor structure. This effectively solves the contradiction between cooling efficiency and structural strength in high-power cavities, reducing thermal deformation and frequency drift, and ensuring stable operation of the entire system.

[0052] Due to its compact structure and small longitudinal dimensions, the design of the connection between the internal conductor and the base is crucial for helical cavity structures. In this application, the base design fully utilizes the transverse and longitudinal space within the cavity, employing a "racetrack-shaped" base to prevent tip discharge or arcing caused by the small distance between the base and the cavity side plate. The connection between the base and the helical internal conductor fully considers surface contact, ensuring a reliable connection and structural stability. Simultaneously, the increased contact area between the base and the helical internal conductor reduces the surface current density on the contact surface, resulting in more uniform heat generation between the short-circuit surface and the base, less thermal deformation between the internal conductor and the base, and stable frequency during high-power operation of the cavity.

[0053] Due to their compact structure and small size, high-voltage, high-power spiral cavities have an increased risk of arcing inside. Therefore, the cavity design must consider limiting the maximum electric field strength to reduce the risk of arcing. In the spiral inner conductor and racetrack-shaped base designed in this application, all edges, corners, and sharp corners are chamfered, which significantly reduces the risk of arcing in the cavity and effectively ensures the safety performance of other equipment in the entire system. At the same time, the use of a gradient spiral inner conductor structure greatly reduces the current density on the surface of the inner conductor, thereby reducing the average temperature of the inner conductor surface and ensuring the working stability of the entire system.

[0054] Power transmission systems used to connect high-power high-frequency resonant cavities and their power sources can only use rigid coaxial feed tubes for connection, and rigid feed tubes cannot be directly rotated. Furthermore, the power feed port of a helical high-frequency resonant cavity cannot typically be designed in a horizontal or vertical direction. Therefore, when connecting to a power source, multiple rotations of the rigid coaxial feed tube using 90° right-angle bends are necessary, increasing the complexity of the transmission line system and reducing safety and stability. This application designs a rigid coaxial feed tube bend with an arbitrarily variable angle, allowing direct feed tube connection for any angle of the feed port direction of the high-frequency cavity, and providing good impedance matching parameters. Simultaneously, the reflection coefficient S11 of this bend is better than -30dB, fully meeting the requirements of high-power transmission and effectively solving the problems of complex connection processes, numerous right-angle turns, and significant risks associated with high-power RF power transmission.

[0055] Figure 1 This is a schematic diagram of a power transmission device at any angle directly connected to a helical high-frequency resonant cavity for power feeding. (Example:) Figure 1 As shown, the spiral cavity 1 is connected to the power source 3 through the transmission pipeline 2.

[0056] Figures 2 to 5 This is a schematic diagram of the overall structure of a high-frequency resonant cavity with a variable diameter spiral.

[0057] like Figures 2 to 5 As shown, the variable-diameter helical high-frequency resonant cavity includes: a fine tuner 16, a collimation reference target 15, a sampling port 8, a coarse tuner 4, a power coupler 5, an inner conductor cooling water pipe 6, a side plate cooling water pipe 7, a vacuum pump interface 9, a cavity cylinder 10, a right end plate 11, a three-dimensional adjustable support 12, a left end plate 13, and a power coupling interface 14. The helical cavity 1 is an annular cavity, with a left end plate 13 and a right end plate 11 respectively located at the two axial ends of the annular cavity to make the helical cavity a sealed cavity. Multiple openings are provided on the annular wall of the helical cavity 1, which are respectively connected to the coarse tuner 4, the power coupler 5, the sampling port 8, the vacuum pump interface 9, the collimation reference target 15, and the fine tuner 16.

[0058] Figures 6 to 7 This is a diagram of the internal structure of a high-frequency resonant cavity with a variable diameter spiral.

[0059] like Figures 6 to 7As shown, the interior of the variable-diameter spiral high-frequency resonant cavity includes: a fine-tuning frequency rod 17, a variable-diameter spiral inner conductor 18, a racetrack-shaped base 19, a coarse-tuning frequency capacitor plate 20, a power coupler coupling ring 21, a drift tube 22, a vacuum sealing ring 23, and a high-frequency sealing ring 24. The vacuum sealing ring 23 and the high-frequency sealing ring 24 are disposed between the cavity cylinder 10 and the left end plate 13 and the right end plate 11. The fine-tuning frequency rod 17, the coarse-tuning frequency capacitor plate 20, and the power coupler coupling ring 21 extend inward from the annular wall of the cavity cylinder 10 into the cavity interior. The racetrack-shaped base 19 is disposed on the inner wall of the cavity cylinder 10. One end of the variable-diameter spiral inner conductor 18 is connected to the racetrack-shaped base 19, and the other end of the variable-diameter spiral inner conductor 18 is connected to the drift tube 22. The drift tube 22 is disposed at the center of the cavity cylinder 10.

[0060] Figures 8 to 11 This is a diagram of the inner conductor of a variable-diameter spiral high-frequency resonant cavity and its water-cooling structure.

[0061] like Figures 8 to 11 As shown, the inner conductor of the variable-diameter spiral high-frequency resonant cavity includes: a gradually decreasing diameter spiral inner conductor 18, a racetrack-shaped base 19, an open-circuit end 27 of the inner conductor, a chamfer 28 of the spiral inner conductor, a chamfer 29 of the racetrack-shaped base, a high-frequency connecting spring coil 30 of the racetrack-shaped base, a variable-diameter spiral stainless steel partition 31, a variable-diameter spiral oxygen-free copper inner conductor 32, an oxygen-free copper inner conductor cooling water inlet channel 33, and an oxygen-free copper inner conductor cooling water outlet channel 34. The end of the inner conductor 18 connected to the drift tube 22 is the open-circuit end 27. A high-frequency connecting spring coil 30 of the racetrack-shaped base is located at the bottom of the racetrack-shaped base 19. A stainless steel partition 31 is located in the middle of the oxygen-free copper inner conductor 32. The stainless steel partition 31 divides the interior of the oxygen-free copper inner conductor 32 into two channels, one serving as the cooling water inlet channel 33 and the other as the cooling water outlet channel 34.

[0062] Figures 12 to 15 This is a structural diagram of a power transmission device at any angle.

[0063] like Figures 12 to 15 As shown, the arbitrary angle power transmission device includes: an inner conductor insert 39, an outer conductor 40, a corner component 41, a flange 42, a coaxial rigid feeder right-angle elbow 45, a coaxial rigid feeder insert 46, a coaxial rigid feeder hose clamp 47, and a coaxial rigid feeder clamp 48. The inner conductor insert 39 is disposed within the inner cavity of the outer conductor 40. Figure 12 As shown, a corner component 41 is provided between the two outer conductors 40, and the corner component 41 is connected to the outer conductors 40 via a flange 42. Figure 13 As shown, the angle of the corner component 41 can be changed arbitrarily. Figure 14 and Figure 15The structure of the coaxial rigid feeder right-angle elbow 45 and the coaxial rigid feeder insert 46 is shown. The coaxial rigid feeder insert 46 is set in the coaxial rigid feeder right-angle elbow 45, and the coaxial rigid feeder hose clamp 47 and the coaxial rigid feeder clamp 48 are clamped on the outer periphery of the rigid feeder right-angle elbow 45.

[0064] The following is a detailed description of the principle and characteristics of a high-power variable-diameter spiral high-frequency resonant cavity and an arbitrary-angle power transmission device of this application. The examples given are only used to explain this application.

[0065] According to an embodiment of this application, a variable diameter spiral high-frequency resonant cavity mainly consists of a spiral inner conductor 18, a racetrack-shaped base 19, a cavity cylinder 10 with a diameter of 600mm (the specific number is only for example), two side plates with a diameter of 600mm, three drift tubes 22, a power coupler 5, a frequency coarse adjustment component 4, a frequency fine adjustment component 16, two voltage samplers, a vacuum pump interface 9, a vacuum gauge interface, four collimation target seats 15, a set of three-dimensional adjustable brackets 12, and a set of cooling water inlet and outlet drains, etc.

[0066] like Figure 8 As shown, the inner conductor 18 of the variable diameter spiral is formed by rotating a rectangular cross-section by 540 degrees. During the rotation, a variable diameter method is used, and the largest rectangular cross-section of the spiral after the diameter change is fully connected to the racetrack-shaped base 19 by welding.

[0067] like Figure 9 As shown, all four sides of the spiral are chamfered, and all sides of the racetrack-shaped base 19 are also chamfered. The inner conductor 18 and the base surface have no sharp edges.

[0068] like Figure 10 As shown, the oxygen-free copper gradient spiral water channel is separated by a stainless steel spiral baffle 31, with the inlet and outlet water channels for the inner conductor on both sides. The water channel extends to the head of the spiral, ensuring sufficient cooling for the entire inner conductor. The oxygen-free copper spiral has a wall thickness greater than 10mm to ensure its structural strength and stability. The stainless steel baffle is 8mm thick, which can fully support the shape of the oxygen-free copper spiral, ensuring that the thermal deformation of the spiral is small enough and has little impact on the cavity resonant frequency. The water channel of the inner conductor 18 is connected to the racetrack-shaped base 19. The cooling water pipe is connected to the bottom surface of the racetrack-shaped base 19. The water first rotates once on the inner surface of the racetrack-shaped base 19 before entering the water inlet channel of the inner conductor 18, flowing to the head of the inner conductor 18, entering the return water pipe of the inner conductor 18, and finally returning to the return water pipe of the inner conductor 18 from the return water pipe of the racetrack-shaped base 19.

[0069] The water channels distributed on the inner surface of the racetrack-shaped base 19 can effectively cool the heat generated on the base surface.

[0070] like Figure 11As shown, the runway-shaped base 19 is equipped with a high-frequency connecting spring ring and a vacuum sealing ring, and the inner conductor 18 and the runway-shaped base 19 are welded together. The bottom of the runway-shaped base 19 is designed with two seals, one is a high-frequency connecting spring ring 30, and the other is a vacuum sealing ring.

[0071] like Figures 12 to 15 As shown, the arbitrary angle power transmission pipeline 2 can directly change the direction of the cavity outlet feed port to horizontal or vertical according to different cavity feed port angles, and directly connect to the power source 3, avoiding the problems of complex connection process, many right-angle turns, and large hidden dangers of high-power radio frequency power transmission in traditional transmission systems.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-frequency resonant device with a variable diameter helical wire, characterized in that, include: The inner conductor adopts a gradually changing diameter spiral structure, including an oxygen-free copper gradually changing spiral channel and a stainless steel gradually changing spiral baffle. The stainless steel gradually changing spiral baffle is disposed in the oxygen-free copper gradually changing spiral channel. and A runway-shaped base is welded to an inner conductor, and the edges, corners, and sharp corners of the inner conductor and the runway-shaped base are chamfered. The inner conductor of the variable diameter spiral is formed by rotating a rectangular cross section. During the rotation, a variable diameter method is used, and the maximum rectangular cross section of the spiral after the diameter change is fully connected with the racetrack-shaped base. The variable diameter spiral high-frequency resonant device is connected to the radio frequency power source through a transmission feeder device. The variable diameter spiral high-frequency resonant device also includes a high-frequency resonant cavity. The transmission feeder includes: Inner conductor ferrule; An outer conductor, wherein the inner conductor insert is disposed inside the outer conductor; A coaxial rigid coaxial feed tube elbow is provided, the feed tube is connected to the feed port of the high-frequency resonant cavity, a coaxial rigid feed tube insert is provided in the coaxial rigid coaxial feed tube elbow, and a coaxial rigid feed tube hose clamp and a coaxial rigid feed tube clamp are provided on the outside of the coaxial rigid coaxial feed tube elbow.

2. The variable diameter helical high-frequency resonant device according to claim 1, characterized in that, The following components are sequentially arranged on the outer peripheral surface of the high-frequency resonant cavity: a frequency fine-tuning component, a collimation reference target, a sampling port, a frequency coarse-tuning component, and a power coupler.

3. The variable diameter helical high-frequency resonant device according to claim 2, characterized in that, The following components are arranged sequentially on the inner circumferential surface of the high-frequency resonant cavity: a fine-tuning frequency rod, a coarse-tuning frequency capacitor plate, and a power coupler coupling ring.

4. The variable diameter helical high-frequency resonant device according to claim 3, characterized in that, The high-frequency resonant cavity also includes a three-dimensional adjustable support.

5. The variable diameter helical high-frequency resonant device according to claim 1, characterized in that, The oxygen-free copper gradient spiral water channel is separated by a stainless steel spiral partition into an inlet channel and an outlet channel for the inner conductor. The inlet channel and the outlet channel of the inner conductor extend to the head of the spiral to ensure sufficient cooling of the entire inner conductor.

6. The variable diameter helical high-frequency resonant device according to claim 5, characterized in that, The water inlet and outlet channels of the inner conductor are connected to the racetrack-shaped base, and a cooling water pipe is connected from the bottom surface of the racetrack-shaped base to introduce water.

7. The variable diameter helical high-frequency resonant device according to claim 1, characterized in that, A high-frequency connecting spring ring and a vacuum sealing ring are installed on the runway-shaped base.

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