Resonant cavity remote frequency modulation device

Abstract

A resonant cavity remote frequency modulation device relates to the technical field of resonant cavities, and adopts the technical scheme that the resonant cavity remote frequency modulation device comprises a telescopic unit, a driving unit and a guide unit, the telescopic unit comprises a mounting flange, a sliding rod in sliding connection with the mounting flange, and an adjusting block arranged at one end, facing a Dee plate, of the sliding rod; the driving unit comprises a nut arranged at the other end of the sliding rod, a lead screw in threaded connection with the nut and a motor in transmission connection with the lead screw. The guide unit comprises a guide rail and a sliding block connected with the guide rail in a sliding mode, and the sliding block is arranged on the sliding rod. The mode of manually adjusting the frequency of the resonant cavity in the prior art can be replaced, complex operation is not needed during frequency modulation, stable adjustment can be achieved in a vacuum environment, safety risks in the operation process are avoided, the working efficiency is improved, fine adjustment in a smaller range is further achieved, mechanical movement does not exist in the resonant cavity, and the service life of the resonant cavity is prolonged. And the Q value can be stabilized and improved.

Description

Technical Field

[0001] The present invention relates to the technical field of resonant cavities, and in particular to a resonant cavity remote frequency modulation device. Background Art

[0002] The resonant cavity is used to generate the accelerating electric field in the cyclotron and is an important component of the cyclotron. During the design process of the cyclotron, the conditions for resonant acceleration are: , where is the resonant cavity frequency, is the magnetic field frequency, The resonant cavity frequency must match the accelerator's magnetic field frequency, representing the number of times a particle is accelerated per revolution. In actual engineering, due to manufacturing errors, assembly errors, and calculation errors, there is often a certain deviation between the magnetic field frequency and the resonant cavity frequency. To ensure that these two frequencies match, mechanical mechanisms are usually used to adjust the frequency.

[0003] CN210042349U discloses a high-frequency cavity, comprising two symmetrically arranged circular tuning cylinders, wherein a vertical short-circuit rod is arranged inside the tuning cylinder, the upper end of the short-circuit rod extends out of the tuning cylinder and is fixedly connected to the accelerating electrode plate (Dee plate) of the cyclotron, and the lower end of the short-circuit rod extends out of the tuning cylinder and is fixedly connected to the supporting disk; a short-circuit disk is fixedly arranged at the bottom of the tuning cylinder; at least one supporting screw is fixedly arranged at the bottom of the short-circuit disk, and a positioning hole is provided on the supporting disk to match the supporting screw, and the supporting screw is passed through the positioning hole; each supporting screw is provided with a group of adjusting nuts, and the operating frequency of the resonant cavity can be adjusted conveniently and quickly by changing the distance between the Dee plate and the short-circuit disk.

[0004] In actual engineering applications, the short-circuit disk is located in the lower half of the accelerator, requiring workers to lie flat during tuning, leaving limited space. Throughout the tuning process, the resonant cavity undergoes mechanical motion during operation, causing instability in the quality factor (Q value), increasing power loss in the cavity, leading to severe cavity heating and low cavity pressure, ultimately affecting the beam intensity extracted by the accelerator. The entire process is time-consuming and poses safety risks. Because it is manually adjusted, fine adjustments within a specific, small range require a high level of skill and are often difficult to achieve. Summary of the Invention

[0005] In response to the problems in existing technical solutions such as limited manual adjustment operation space, difficulty in precise adjustment, and unstable Q value of the resonant cavity during tuning, the present invention provides a resonant cavity remote frequency modulation device.

[0006] The present invention provides the following technical solution: a resonant cavity remote frequency modulation device, comprising: The telescopic unit includes a mounting flange, a sliding rod slidably connected to the mounting flange, and an adjustment block provided at one end of the sliding rod facing the Dee plate; A driving unit comprising a nut provided at the other end of the sliding rod, a screw threadedly connected to the nut, and a motor drivingly connected to the screw; The guide unit comprises a guide rail and a slider slidably connected to the guide rail, and the slider is arranged on the sliding rod.

[0007] Preferably, the mounting flange is provided with a bracket, and the guide rail is provided on the bracket.

[0008] Preferably, the bracket is further provided with a bearing seat, the screw rod passes through the bearing seat, and an angular contact bearing is provided between the screw rod and the bearing seat.

[0009] Preferably, the motor output shaft is connected to the screw rod through a coupling.

[0010] Preferably, the device further comprises a controller electrically connected to the motor.

[0011] The beneficial effects of the present invention are: using a motor to drive the lead screw to drive the nut and the sliding rod to move linearly, changing the distance between the adjustment block and the Dee plate, thereby changing the capacitance formed between the resonant cavity and the vacuum box, and then achieving the purpose of adjusting the frequency of the resonant cavity. It can replace the manual adjustment of the resonant cavity frequency in the existing technology. No complicated operation is required for frequency modulation, and it can be smoothly adjusted in a vacuum environment, avoiding safety risks during operation, improving work efficiency, and further realizing fine adjustment in a smaller range. In addition, there is no mechanical movement in the resonant cavity, which can be stable and improve the Q value. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A schematic diagram of an embodiment of a remote frequency modulation device.

[0013] Figure numerals: 11, mounting flange; 12, sliding rod; 13, adjusting block; 14, bracket; 21, nut; 22, screw rod; 23, motor; 24, bearing seat; 31, guide rail; 32, slider; 41, vacuum box; 42, Dee plate. DETAILED DESCRIPTION

[0014] The following is a more detailed description of the embodiments of the present invention with reference to the accompanying drawings and reference numerals, so that those skilled in the art can implement the invention after studying this specification. It should be understood that the specific embodiments described herein are only used to illustrate the invention and are not intended to limit the invention.

[0015] Cyclotron accelerators often use coaxial resonant cavities with half wavelength and 1 / 4 wavelength. In the coaxial resonant cavity, the resonant cavity frequency satisfies the following formula:

[0016] Where, is the resonant cavity frequency, C is the capacitance, and l is the coaxial line length of the coaxial resonant cavity.

[0017] The present invention provides a resonant cavity remote frequency modulation device, which is used to replace the manual adjustment of the resonant cavity frequency in the prior art. The frequency modulation does not require complicated operations and can be smoothly adjusted in a vacuum environment, avoiding safety risks during operation, improving work efficiency, and further realizing fine adjustment within a smaller range.

[0018] like Figure 1 As shown, the remote frequency modulation device includes a telescopic unit, a driving unit and a guiding unit.

[0019] The telescopic unit includes a mounting flange 11 for securing the remote frequency modulation device to the side wall of a vacuum box 41, a sliding rod 12 slidably connected to the mounting flange 11, and an adjustment block 13 disposed at the end of the sliding rod 12 facing the Dee plate 42. The vacuum box 41 and Dee plate 42 are the original structure of the cyclotron and are not within the scope of protection of this invention.

[0020] The interior of the vacuum box 41 is in a vacuum state. A through hole is opened in the side wall of the vacuum box 41, and the mounting flange 11 is installed at the through hole. A sealing ring is provided between the mounting flange 11 and the vacuum box 41 to improve sealing performance. One end of the sliding rod 12 passes through the mounting flange 11 and enters the interior of the vacuum box 41. This end faces the Dee plate 42 and is bolted to the adjustment block 13. A sealing ring is also provided between the sliding rod 12 and the mounting flange 11. By sliding the sliding rod 12 relative to the mounting flange 11, the distance between the adjustment block 13 and the Dee plate 42 is changed, thereby changing the capacitance formed between the resonant cavity and the vacuum box, thereby achieving the purpose of adjusting the resonant cavity frequency.

[0021] The drive unit includes a nut 21 disposed at the other end of the sliding rod 12, a screw 22 threadedly connected to the nut 21, and a motor 23 in transmission connection with the screw 22. Specifically, the nut 21 is bolted to the sliding rod 12; the mounting flange 11 is provided with a bracket 14, which is provided with a bearing seat 24, and the screw 22 is rotatably connected to the bearing seat 24 via an angular contact bearing; the screw 22 is in transmission connection with the output shaft of the motor 23 via a coupling; the motor 23 can be a servo motor, which is electrically connected to a controller, which can be a PLC or single-chip microcomputer to achieve precise positioning. If combined with other program settings, it can also realize functions such as automatic frequency tracking and automatic frequency finding of the accelerator.

[0022] The guide unit includes a guide rail 31 and a slider 32 slidably connected to the guide rail 31. The guide rail 31 is mounted on the bracket 14 and extends parallel to the axial direction of the screw rod 22. The slider 32 is mounted on the sliding rod 12. When the sliding rod 12 moves linearly, the guide unit ensures that the motion trajectory does not deviate.

[0023] Motor 23 rotates screw 22. The threaded connection between screw 22 and nut 21 drives nut 21 and slide rod 12 to move linearly along the screw's axial direction, thereby changing the distance between adjustment block 13 and Dee plate 42. This approach offers the advantage of high positioning accuracy, enabling fine adjustments within a narrow range. During frequency modulation using this method, there is no mechanical movement in the resonant cavity, which improves the Q factor, reduces cavity losses, increases accelerator cavity pressure, and enhances beam intensity.

[0024] The above is a description of one or more embodiments of the present invention, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A resonant cavity remote frequency modulation device, characterized in that: include: The telescopic unit includes a mounting flange, a sliding rod slidably connected to the mounting flange, and an adjustment block provided at one end of the sliding rod facing the Dee plate; A driving unit comprising a nut provided at the other end of the sliding rod, a screw threadedly connected to the nut, and a motor drivingly connected to the screw; The guide unit comprises a guide rail and a slider slidably connected to the guide rail, and the slider is arranged on the sliding rod.

2. A resonant cavity remote frequency modulation device according to claim 1, characterized in that: The mounting flange is provided with a bracket, and the guide rail is provided on the bracket.

3. A resonant cavity remote frequency modulation device according to claim 2, characterized in that: The bracket is further provided with a bearing seat, the screw rod passes through the bearing seat, and an angular contact bearing is provided between the screw rod and the bearing seat.

4. The resonant cavity remote frequency modulation device according to claim 1, characterized in that: The motor output shaft is connected to the screw rod through a coupling.

5. The resonant cavity remote frequency modulation device according to claim 1, characterized in that: Also included is a controller electrically connected to the motor.

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