Cyclotron high-frequency cavity frequency device and tuning method thereof

Abstract

The invention relates to a cyclotron high-frequency cavity frequency device and a tuning method thereof, and belongs to the technical field of cyclotrons. The cyclotron high-frequency cavity frequency device comprises a cavity shell, a Dee plate electrode, a Dee plate and inner rod connecting part, an inner rod, a feed-in mechanism, a coarse adjustment mechanism and a fine adjustment mechanism. The coarse adjustment mechanism comprises a first coarse adjustment mechanism and a second coarse adjustment mechanism; the feed-in mechanism, the coarse adjustment mechanism and the fine adjustment mechanism are all arranged on the cavity shell; the feed-in mechanism and the coarse adjustment mechanism are located on the left side of the cavity shell, and the fine adjustment mechanism is located on the right side of the cavity shell. And the feed-in mechanism, the coarse adjustment mechanism and the fine adjustment mechanism are spaced from the Dee plate electrode. According to the invention, the preliminary tuning of the frequency of the high-frequency cavity in the installation period can be satisfied, the real-time fine tuning of the acceleration cavity in the operation process can be realized, the structure is simple, the reusability is high, and the purpose of tuning the frequency of the high-frequency cavity is well achieved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cyclotrons, and in particular relates to a cyclotron high-frequency cavity frequency device and a tuning method thereof. BACKGROUND

[0002] In the existing technical field of cyclotrons, patent application CN202010264504.X and patent application CN202323634831.8 disclose frequency tuning methods. However, in the process of converting a cyclotron cavity from theory to practice, mechanical errors and installation errors inevitably cause the frequency to be unable to completely match the theoretical design. In addition, in the practical application of the accelerator, some factors will cause the resonant frequency of the resonant cavity to drift, such as the expansion of the cavity due to heating after the power is fed in, the instability of the power supply voltage and power source, and the beam intensity, which will also affect the high-frequency frequency.

[0003] In order to meet the isochronicity requirement of particle acceleration, the cavity frequency must be consistent with the theory and the relative stability of the cavity frequency must be maintained, so a frequency tuning method is needed to ensure that the cavity frequency is consistent with the theory and to keep the resonant frequency stable in real time, so that the cavity frequency is consistent with the power source feeding frequency as much as possible, and the best matching is achieved to realize high-efficiency particle acceleration. SUMMARY

[0004] The present application proposes a cyclotron high-frequency cavity frequency device and a tuning method thereof, which aims to partially or completely solve the above-mentioned problems in the frequency tuning of the existing cyclotron high-frequency cavity. The present application can meet the preliminary tuning of the high-frequency cavity frequency during the installation period and can also realize real-time fine tuning during the operation of the acceleration cavity. The structure is simple and has high reusability. In order to achieve the purpose of the present application, the technical solution of the present application is as follows: A cyclotron high-frequency cavity frequency device, comprising: a cavity shell, a Dee plate electrode, a Dee plate and inner rod connecting component, an inner rod, a feeding mechanism, a coarse tuning mechanism, and a fine tuning mechanism; The coarse tuning mechanism comprises a first coarse tuning mechanism and a second coarse tuning mechanism. The feeding mechanism, the coarse tuning mechanism, and the fine tuning mechanism are all arranged on the cavity shell. The feeding mechanism and the coarse tuning mechanism are located on the left side of the cavity shell, and the fine tuning mechanism is located on the right side of the cavity shell. The feeding mechanism, the coarse tuning mechanism, and the fine tuning mechanism all form a spacing with the Dee plate electrode.

[0005] Optionally, the position of the first coarse tuning mechanism and / or the second coarse tuning mechanism relative to the Dee plate electrode is adjusted.

[0006] Optionally, the size of the capacitive plate of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism is adjusted.

[0007] Optionally, the position of the fine adjustment mechanism relative to the Dee plate electrode is adjusted.

[0008] Optionally, the position of the support rod of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism relative to the Dee plate electrode is adjusted.

[0009] A method for tuning the frequency of a high-frequency cavity of a cyclotron using any of the high-frequency cavity frequency tuning devices described above, comprising: adjusting the position of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism relative to the Dee plate electrode; and / or, adjusting the size of the capacitive plate of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism; and / or, adjusting the position of the fine adjustment mechanism relative to the Dee plate electrode.

[0010] The beneficial effects achieved by the present application relative to the prior art are as follows: In the present application, the high-frequency cavity frequency tuning device and the tuning method thereof have both coarse and fine frequency tuning, and can correct the frequency deviation caused by mechanical errors of the cavity components and actual beam emission cavity heating; the coarse frequency tuning can be performed using capacitive plates of different sizes, without the use of electric equipment, and the design is simple and reliable; the coarse tuning equipment is easy to disassemble and assemble, has high adaptability, can be used for different energy cyclotrons, and in actual use, the fine frequency tuning only needs to control the distance between the tuning capacitive plate and the Dee plate, the program and structure are simple and reliable, do not affect the high-frequency magnetic field and electric field, have high reusability, and the corresponding results show that the linearity of the corresponding parameter adjustment and the frequency change is good and the purpose of high-frequency cavity frequency tuning is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0012] Figure 1 FIG. 1 is a structural schematic diagram of a high-frequency cavity frequency tuning device of a cyclotron according to the present application; Figure 2 FIG. 3 is a result diagram of the resonant frequency after frequency tuning by adjusting the position of the coarse adjustment mechanism relative to the Dee plate electrode according to the present application; Figure 3 FIG. 4 is a result diagram of the resonant frequency after frequency tuning by adjusting the size of the capacitive plate of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism according to the present application. Figure 4 This is a schematic diagram showing the result of frequency tuning after adjusting the position of the fine-tuning mechanism relative to the Dee plate electrode according to the present invention. The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this application.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means one, two, or more than two, unless otherwise explicitly specified.

[0016] In this invention application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral molding, or an integrated unit; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention application according to the specific circumstances.

[0017] To make the objectives, technical solutions, and advantages of this invention application clearer, the embodiments of this invention application will be described in further detail below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, a high-frequency cavity frequency tuning device for a cyclotron accelerator includes: 1. Cavity shell; 2. Dee plate electrode; 3. Dee plate and inner rod connection component; 4. Inner rod; 5. Feeding mechanism; 8. Coarse adjustment mechanism and fine adjustment mechanism; The coarse adjustment mechanism includes a first coarse adjustment mechanism 6 and a second coarse adjustment mechanism 7; the feed mechanism 5, the coarse adjustment mechanism, and the fine adjustment mechanism 8 are all located on the cavity shell 1; the feed mechanism 5 and the coarse adjustment mechanism are located on the left side of the cavity shell 1, and the fine adjustment mechanism 8 is located on the right side of the cavity shell 1. The feeding mechanism 5, the coarse adjustment mechanism, and the fine adjustment mechanism 8 all form a gap with the Dee plate electrode 2.

[0019] In this invention application, the Dee (short for "D-shaped electrode") plate electrode 2 can be made of a highly conductive material (such as copper or aluminum alloy), shaped like the letter "D," and mounted on the inner rod 4 and fixed by the connecting component 3 to ensure the generation of a uniform radio frequency electric field within the high-frequency cavity for particle acceleration. Cyclotrons typically have two symmetrical Dee plates placed in a strong magnetic field. When particles pass through the gap between the two Dee plates, they are accelerated by the electric field, while the magnetic field causes the particles to move along a spiral path, achieving continuous acceleration. The shape and size of the Dee plate electrode are optimized according to the cavity resonant frequency to meet isochronous acceleration requirements.

[0020] In this invention application, the feed mechanism 5 is an RF power coupler, which can adopt a coaxial feed line or waveguide structure and is located on the left side of the cavity housing 1. It is used to input an external RF power source (such as a solid-state amplifier or a vacuum tube amplifier) ​​into the high-frequency cavity. The feed mechanism 5 may include a coupling ring or probe assembly, which maintains an appropriate distance from the Dee plate electrode 2 to avoid interference field distribution and achieve impedance matching. It may also integrate a variable inductance coupling mechanism, which adjusts the coupling coefficient by a sliding short circuit to ensure that the power transmission efficiency is higher than 90%. The feed mechanism 5 may also be equipped with a cooling system for heat dissipation.

[0021] In this invention application, the first coarse adjustment mechanism 6 and the second coarse adjustment mechanism 7 together constitute a coarse adjustment mechanism. Both the first coarse adjustment mechanism 6 and the second coarse adjustment mechanism 7 can adopt a sliding tuning plate or a sliding tuner mechanism driven by hydraulic or stepper motor. The sliding tuning mechanism achieves a wide range of frequency adjustment by changing the equivalent capacitance or inductance in the cavity through mechanical movement.

[0022] In this invention application, the support rods of the first coarse adjustment mechanism 6 and the second coarse adjustment mechanism 7 are both integrated on the sliding tuning plate or tuner. The support rods of the first coarse adjustment mechanism 6 and the second coarse adjustment mechanism 7 are used to provide mechanical connection, support and position adjustment functions. The support rods can be made of high-strength materials (such as stainless steel or aluminum alloy). The support rods can have a telescopic or adjustable length design to control the distance between the coarse adjustment mechanism and the Dee plate electrode 2, thereby indirectly affecting the change of cavity volume or parasitic parameters, resulting in a corresponding shift in resonant frequency. Working in conjunction with the sliding tuning mechanism, it improves the reliability of tuning and avoids uneven field distribution.

[0023] In this invention application, the first coarse adjustment mechanism 6 can be mainly responsible for the movement of the top or main panel to compensate for frequency shifts caused by mechanical installation errors and thermal expansion; the second coarse adjustment mechanism 7 serves as an auxiliary mechanism to provide symmetrical or local micro-movement adjustments to ensure uniform changes in cavity volume or capacitance. This can be achieved through a multi-functional sliding short circuit breaker and integrated with the feed mechanism 5.

[0024] In this invention application, the fine-tuning mechanism 8 can be a motor-driven fine-tuner or a piezoelectric / magnetostrictive element, located on the right side of the cavity shell 1, for real-time precise frequency adjustment (e.g., tuning range of tens of kHz). The fine-tuning mechanism 8 maintains an appropriate distance from the Dee plate electrode 2 to avoid disturbing the radio frequency field distribution. Specifically, the fine-tuning mechanism 8 can achieve fine mechanical displacement by driving the fine-tuner with a motor (such as a stepper motor or servo motor), or generate micron-level deformation using a piezoelectric element (based on the inverse piezoelectric effect, generating micron-level deformation by applying voltage), or induce material expansion and contraction using a magnetostrictive element (based on the principle of magnetic field-induced material expansion and contraction, providing high-response speed nanometer-level adjustment), for real-time precise frequency adjustment (e.g., tuning range of tens of kHz).

[0025] In this invention application, the radio frequency power generated by an external radio frequency power source is input into the high-frequency cavity inside the cavity housing 1 through the feed mechanism 5. The feed mechanism 5 employs a radio frequency power coupler (such as a coaxial feed line or waveguide structure), using a coupling ring or probe assembly to couple the power to the Dee plate electrodes 2. The coupling coefficient is adjusted by a sliding short-circuit device to achieve impedance matching and efficient power transmission. The Dee plate electrodes 2, as the core accelerating element, are fixed to the inner rod 4 and installed inside the cavity housing 1 via connecting components 3. Their D-shaped structure design generates a uniform radio frequency electric field. When charged particles move along a spiral path in a strong magnetic field and pass through the gap between the Dee plate electrodes 2, they are accelerated by the alternating electric field, achieving continuous particle acceleration.

[0026] In the initial stage, the coarse adjustment mechanism (including the first coarse adjustment mechanism 6 and the second coarse adjustment mechanism 7) can be used for a wide range of frequency adjustments. The first coarse adjustment mechanism 6 and the second coarse adjustment mechanism 7 employ a hydraulic or stepper motor driven sliding tuner plate or slugtuner mechanism to compensate for frequency shifts caused by mechanical installation errors and thermal expansion by changing the cavity volume or capacitance (such as moving the top or main panel) (tuning range up to hundreds of kHz to MHz).

[0027] In actual operation, the fine-tuning mechanism 8 is used for real-time precision frequency adjustment. The fine-tuning mechanism 8 adopts a motor-driven trimmer or piezoelectric / magnetostrictive element, and realizes closed-loop feedback control (tuning range of tens of kHz) by monitoring the cavity sampling signal (such as phase shift or reflection power), quickly responding to frequency drift factors (such as beam intensity or power fluctuation), and compensating for thermal detuning under high RF power.

[0028] By combining the above coarse and / or fine adjustments, the cavity frequency can be made as consistent as possible with the power source feed frequency, achieving optimal matching and high-efficiency particle acceleration. At the same time, all mechanisms (feed mechanism 5, coarse adjustment mechanism, and fine adjustment mechanism 8) are appropriately spaced from the Dee plate electrode 2, avoiding direct interference or disturbance of the radio frequency electric field generated by these mechanisms on the Dee plate electrode 2. This prevents arc discharge, parasitic capacitance changes, or thermal conduction effects caused by mechanical contact or excessively close distance, thereby maintaining the stability of the high-frequency cavity's resonant characteristics and reducing energy loss.

[0029] like Figure 2 As shown, frequency tuning can be achieved by adjusting the position of the first coarse adjustment mechanism 6 and / or the second coarse adjustment mechanism 7 from the Dee plate electrode 2. For example, adjusting the position of the support rod of the first coarse adjustment mechanism 6 and / or the second coarse adjustment mechanism 7 from the Dee plate electrode 2. Specifically, by adjusting the support rod to change the distance between the coarse adjustment mechanism and the Dee plate electrode 2 (ranging from about 10mm to about 25mm), coarse adjustment of the cavity resonant frequency can be achieved. When the distance increases from about 10mm to about 25mm, the resonant frequency gradually increases from about 62.4073MHz to 63.6854MHz, showing an initial rapid increase followed by a flattening curve relationship (data points include 62.8896MHz, 63.2036MHz, 63.4205MHz, and 63.5736MHz, etc.). This adjusts the cavity frequency to be consistent with the theoretical frequency, ensuring compensation for the initial frequency deviation caused by mechanical and installation errors, achieving the initial matching of the high-frequency cavity, and well achieving the purpose of high-frequency cavity frequency tuning.

[0030] like Figure 3As shown, frequency tuning can be achieved by adjusting the size of the capacitor plate in the first coarse adjustment mechanism 6 and / or the second coarse adjustment mechanism 7. Specifically, by changing the size of the capacitor plate (ranging from approximately 0mm to 55mm), coarse adjustment of the cavity resonant frequency can be realized. When the capacitor plate size increases from 0mm to 50mm, the resonant frequency gradually increases from 63.4717MHz to 63.7449MHz, an increase of approximately 0.2732MHz. The curve shows an approximately linear but initially rapid upward trend (data points include 63.4897MHz, 63.5051MHz, etc.). (MHz, 63.5214MHz, 63.5422MHz, 63.5613MHz, 63.5832MHz, 63.6036MHz, 63.6253MHz, 63.6552MHz, 63.6771MHz, 63.7015MHz, and 63.7265MHz, etc.). By selecting an appropriate capacitor plate size, the cavity frequency is adjusted to match the theoretical frequency, ensuring compensation for frequency deviation caused by thermal expansion or power instability, achieving efficient initial tuning, and well achieving the purpose of high-frequency cavity frequency tuning.

[0031] like Figure 4 As shown, frequency tuning can be achieved by adjusting the position of the fine-tuning mechanism relative to the Dee plate electrode 2. Specifically, by precisely adjusting the distance between the fine-tuning mechanism 8 and the Dee plate electrode 2 (ranging from 5mm to 30mm), real-time fine-tuning of the cavity resonant frequency can be realized. When the distance increases from 5mm to 30mm, the resonant frequency gradually rises from 61.8739MHz to 63.9112MHz, an increase of approximately 2.0373MHz. The curve exhibits a continuously rising quadratic curve characteristic (data points include 62.9401MHz, 63.3665MHz, 63.5983MHz, 63.6798MHz, 63.7444MHz, and 63.8429MHz, etc.). This closed-loop feedback control of the distance achieves precise compensation for frequency drift, ensuring the cavity frequency matches the theoretical frequency and remains relatively stable. This effectively achieves the goal of high-frequency cavity frequency tuning and supports the isochronism requirements of particle acceleration.

[0032] In this invention application, the high-frequency cavity frequency device and its tuning method for a cyclotron accelerator combine coarse and fine frequency tuning, and can simultaneously correct frequency deviations caused by mechanical errors of various cavity components and actual beam output cavity heating. Coarse frequency tuning can be performed using capacitor plates of different sizes, without electric equipment, with simple design and high reliability. The coarse tuning device is easy to assemble and disassemble, highly adaptable, and can be used in cyclotron accelerators of different energies. In actual use, fine frequency tuning only requires controlling the distance between the tuning capacitor plate and the Dee plate. The procedure is simple and reliable, and it will not affect the high-frequency magnetic field or electric field. It has high reusability, and the corresponding results show that the linearity between the adjustment of the corresponding parameters and the frequency change is good, and the purpose of high-frequency cavity frequency tuning is achieved.

[0033] A method for tuning the frequency of a high-frequency cavity in a cyclotron, using a high-frequency cavity tuning device for a cyclotron, comprising: Adjust the position of the coarse adjustment mechanism relative to electrode 2 on the Dee plate; And / or, adjust the size of the capacitor plate of the first coarse adjustment mechanism 6 and / or the second coarse adjustment mechanism 7; And / or, adjust the position of the fine-tuning mechanism relative to the Dee plate electrode 2.

[0034] In this invention application, adjusting the position of the coarse adjustment mechanism from the Dee plate electrode 2 includes: adjusting the position of the support rod of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism from the Dee plate electrode. Preferably, the position of the support rod of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism from the Dee plate electrode is adjusted.

[0035] In this invention application, during the initial coarse adjustment stage, by adjusting the position of the coarse adjustment mechanism relative to the Dee plate electrode 2 (e.g., changing the length of the support rod to vary the distance within the range of 10mm to 25mm), the equivalent capacitance or parasitic inductance within the cavity can be effectively changed, causing the resonant frequency to rise or fall accordingly. This achieves wide-range frequency compensation, overcoming the initial offset caused by mechanical installation errors and thermal expansion. Alternatively or simultaneously, the size of the capacitor plate of the first coarse adjustment mechanism 6 and / or the second coarse adjustment mechanism 7 can also be adjusted to further coarsely adjust the frequency by directly modifying the capacitance value. During operation, the position of the fine adjustment mechanism 8 relative to the Dee plate electrode 2 can be adjusted, and a closed-loop feedback mechanism (e.g., monitoring phase shift or reflected power) can be used to achieve real-time fine adjustment, quickly responding to frequency drift factors (e.g., beam intensity or power fluctuations) and compensating for thermal detuning under high RF power.

[0036] In the invention application, by adjusting the distance and / or size of the capacitor plate of the coarse adjustment mechanism and the precise position control of the fine adjustment mechanism, full coverage from large-scale initial matching to real-time fine adjustment can be achieved, effectively overcoming frequency drift, ensuring that the cavity frequency is consistent with the theoretical value, improving the isochronism and stability of particle acceleration, and the tuning method enables impedance matching between the cavity and the power source. The individual or combined application of various adjustment methods can adapt to different cavity designs and operating conditions, and can also be extended to other cyclotron accelerator types, improving the versatility and economy of tuning.

[0037] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted; furthermore, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted; furthermore, the steps, measures, and schemes in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The above-described embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the patent for the embodiments of this disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the embodiments of this disclosure, and these all fall within the protection scope of the embodiments of this disclosure. Therefore, the protection scope of the embodiments of this disclosure should be determined by the appended claims. As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail can be made without departing from the spirit and scope of the present invention as defined in the appended claims.

[0038] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A high-frequency cavity frequency device for a cyclotron accelerator, comprising: Cavity shell, Dee plate electrode, Dee plate and inner rod connection component, inner rod, feeding mechanism, coarse adjustment mechanism and fine adjustment mechanism; The coarse adjustment mechanism includes a first coarse adjustment mechanism and a second coarse adjustment mechanism; the feed mechanism, the coarse adjustment mechanism, and the fine adjustment mechanism are all located on the outer shell of the cavity; the feed mechanism and the coarse adjustment mechanism are located on the left side of the outer shell of the cavity, and the fine adjustment mechanism is located on the right side of the outer shell of the cavity; The feeding mechanism, coarse adjustment mechanism, and fine adjustment mechanism all form a gap with the Dee plate electrode.

2. The high-frequency cavity frequency device for a cyclotron accelerator according to claim 1, characterized in that, Adjust the position of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism relative to the Dee plate electrode.

3. The high-frequency cavity frequency device for a cyclotron accelerator according to claim 1, characterized in that, Adjust the size of the capacitor plate of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism.

4. The high-frequency cavity frequency device for a cyclotron accelerator according to claim 1, characterized in that, Adjust the position of the fine-tuning mechanism relative to the Dee plate electrode.

5. The high-frequency cavity frequency device for a cyclotron accelerator according to claim 1, characterized in that, Adjust the position of the support rod of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism from the Dee plate electrode.

6. A method for tuning the frequency of a cyclotron's high-frequency cavity, using the cyclotron's high-frequency cavity frequency device according to any one of claims 1-5, comprising: Adjust the position of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism relative to the Dee plate electrode; And / or, adjust the size of the capacitor plate of the first coarse adjustment mechanism and / or the second coarse adjustment mechanism; And / or, adjust the position of the fine-tuning mechanism relative to the Dee plate electrode.

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