Dual-frequency independent tuning method for dual-mode high-frequency cavity

Abstract

The application discloses a dual-frequency independent tuning method of a dual-mode high-frequency cavity, and comprises the following steps: simulating electromagnetic field distribution in the dual-mode high-frequency cavity by electromagnetic field simulation calculation and test software; finding positions for installing two piston type tuners according to the simulated electromagnetic field distribution; and adjusting depths of the two piston type tuners in the cavity respectively. According to the application, the electromagnetic field simulation calculation and test software are used to simulate the electromagnetic field distribution in the dual-mode high-frequency cavity, one piston type tuner is fixedly installed in a region with strong magnetic field and weak electric field of a fundamental wave and uniform electromagnetic field distribution of a third harmonic wave, another piston type tuner is fixedly installed in a region with strong magnetic field and weak electric field of the third harmonic wave and uniform electromagnetic field distribution of the fundamental wave, the vertical depth of the bottom end of the piston type tuner is adjusted, and then the dual-frequency of the dual-mode high-frequency cavity is independently tuned.

Description

Technical Field

[0001] This invention relates to the field of high-frequency systems for particle accelerators, and particularly to a dual-frequency independent tuning method for a dual-mode high-frequency cavity. Background Technology

[0002] High-performance synchrotron radiation source storage ring high-frequency systems require the use of two different types of high-frequency cavities—fundamental and harmonic—to compensate for the power loss of the electron beam due to synchrotron radiation and to reduce in-beam scattering effects and improve Toscher lifetime.

[0003] High-performance synchrotron radiation source storage ring high-frequency systems typically use a combination of multiple types of high-frequency cavities, which increases system complexity, construction costs, and operation and maintenance difficulties. They also require more space and affect system stability. Furthermore, existing high-frequency cavities only have one operating frequency, and frequency tuning methods are all for one frequency, making it difficult to achieve separate tuning of the two operating frequencies in a dual-mode high-frequency cavity, thus reducing its applicability and convenience. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-frequency independent tuning method for a dual-mode high-frequency cavity to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dual-mode high-frequency cavity dual-frequency independent tuning method, comprising the following steps:

[0006] Step 1: Simulate the electromagnetic field distribution inside the dual-mode high-frequency cavity using electromagnetic field simulation calculation and testing software;

[0007] Step 2: Based on the electromagnetic field distribution simulated in Step 1, find the region with a strong magnetic field and weak electric field of the fundamental wave and a uniform distribution of the electromagnetic field of the third harmonic, and use it to install the piston-type tuner for adjusting the fundamental wave.

[0008] Step 3: Based on the electromagnetic field distribution simulated in Step 1, find the region with strong magnetic field and weak electric field of the third harmonic and uniform distribution of electromagnetic field of the fundamental wave, and use it to install the piston-type tuner for adjusting the third harmonic.

[0009] Step 4: By adjusting the depth of the fundamental frequency piston tuner and the third harmonic piston tuner inside the cavity respectively, the two operating frequencies of the dual-mode high-frequency cavity can be tuned independently.

[0010] Preferably, both the fundamental tuner and the third harmonic tuner are piston-type tuners. The fundamental tuner and the third harmonic tuner are located outside the dual-mode high-frequency cavity. The fundamental tuner is located in the region of strong magnetic field, weak electric field and uniform electromagnetic field of the third harmonic, and the third harmonic tuner is located in the region of strong magnetic field, weak magnetic field and uniform electromagnetic field of the fundamental.

[0011] Preferably, the dual-mode high-frequency cavity includes:

[0012] An inner conductor, located in the middle of the cavity of a dual-mode high-frequency cavity, is used for the flow of electrons;

[0013] End plate one, the middle part of which is fixedly inserted and connected to one end of the inner conductor, is used to fix and install the inner conductor;

[0014] An outer conductor one, one end of which is fixedly connected to the outer wall of an end plate one;

[0015] The second outer conductor has one end fixedly connected to the other end of the first outer conductor and is arranged in a cylindrical shape.

[0016] End plate two, one end of which is fixedly connected to the other end of outer conductor two;

[0017] A through hole is provided in the middle of end plate two;

[0018] Multiple piston-type tuners are disposed on top of the outer walls of outer conductor one and outer conductor two, and are configured to tune the fundamental frequency and the third harmonic.

[0019] The technical effects and advantages of this invention are as follows:

[0020] This invention utilizes a combination of outer conductor two, outer conductor one, and a piston-type tuner. The outer conductor two and outer conductor one form a convex structure, which, together with the inner conductor, constitutes the main body of a dual-mode high-frequency cavity. Electromagnetic field distribution within the dual-mode high-frequency cavity is simulated using electromagnetic field simulation calculations and testing software. One piston-type tuner is fixedly installed in a region with a strong magnetic field and weak electric field of the fundamental wave, while the third harmonic electromagnetic field is evenly distributed. Another piston-type tuner is fixedly installed in a region with a strong magnetic field and weak electric field of the third harmonic wave, while the fundamental wave electromagnetic field is evenly distributed. Adjustment is achieved by extending the bottom of the piston-type tuner vertically, thereby independently tuning the two frequencies of the dual-mode high-frequency cavity. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2This is a schematic cross-sectional view of the inner conductor of the present invention.

[0023] Figure 3 This is a schematic diagram of the longitudinal distribution of the electromagnetic field amplitude inside the cavity wall of the dual-mode high-frequency cavity of the present invention.

[0024] In the diagram: 1. Dual-mode high-frequency cavity; 2. Inner conductor; 3. End plate one; 4. Outer conductor one; 5. Outer conductor two; 6. End plate two; 7. Through hole; 8. Piston-type tuner. Detailed Implementation

[0025] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides, for example Figure 1-2 The dual-mode high-frequency cavity dual-frequency independent tuning method shown includes the following steps:

[0027] Step 1: Simulate the electromagnetic field distribution inside the dual-mode high-frequency cavity using electromagnetic field simulation calculation and testing software;

[0028] Step 2: Based on the electromagnetic field distribution simulated in Step 1, find the region with a strong magnetic field and weak electric field of the fundamental wave and a uniform distribution of the electromagnetic field of the third harmonic, and use it to install the piston-type tuner for adjusting the fundamental wave.

[0029] Step 3: Based on the electromagnetic field distribution simulated in Step 1, find the region with strong magnetic field and weak electric field of the third harmonic and uniform distribution of electromagnetic field of the fundamental wave, and use it to install the piston-type tuner for adjusting the third harmonic.

[0030] Step 4: By adjusting the depth of the fundamental frequency piston tuner and the third harmonic piston tuner into the cavity respectively, the two operating frequencies of the dual-mode high-frequency cavity can be tuned independently.

[0031] Both the fundamental tuner and the third harmonic tuner are piston-type tuners. The fundamental tuner and the third harmonic tuner are located on the outside of the dual-mode high-frequency cavity. The fundamental tuner is located in the region of strong magnetic field and weak electric field of the fundamental wave and uniform electromagnetic field of the third harmonic wave. The third harmonic tuner is located in the region of strong magnetic field and weak magnetic field of the third harmonic wave and uniform electromagnetic field of the fundamental wave.

[0032] The dual-mode high-frequency cavity 1 includes:

[0033] The dual-mode high-frequency cavity 1 is convex in shape. Based on the principle of cavity perturbation, the resonant frequency can be adjusted in strong magnetic field / weak electric field or strong electric field / weak magnetic field regions using cavity perturbation. However, if perturbation is performed in the electromagnetic field equilibrium region, the frequency remains essentially unchanged. (See the attached instruction manual.) Figure 3 In region A, the fundamental wave has a strong magnetic field and a weak electric field, while the electromagnetic field of the third harmonic is balanced. (See the attached instruction manual.) Figure 3 In region B, where the magnetic field of the third harmonic is strong and the electric field is weak, while the electromagnetic field of the fundamental wave is balanced, a piston-type tuner can be used to tune the fundamental wave separately in the region where the magnetic field of the fundamental wave is strong and the electric field is weak, while the electromagnetic field of the third harmonic is balanced. In the region where the magnetic field of the third harmonic is strong and the electric field is weak, while the electromagnetic field of the fundamental wave is balanced, a piston-type tuner can be used to tune the third harmonic separately, and the two do not affect each other.

[0034] Inner conductor 2 is fixedly installed in the middle of the cavity of the dual-mode high-frequency cavity 1. The electron flow flows in the cavity of the inner conductor 2 and flows to the position of the through hole 7.

[0035] End plate 3, the middle part of end plate 3 is fixedly inserted and connected to one end of inner conductor 2, inner conductor 2 is electrically connected to end plate 3, and is fixedly installed in the inner cavity of dual-mode high-frequency cavity 1 through end plate 3;

[0036] Outer conductor 4, one end of which is fixedly connected to the outer wall of end plate 3, and the length and diameter of outer conductor 4 are greater than those of outer conductor 5;

[0037] Outer conductor 2 5, one end of which is fixedly connected to the other end of outer conductor 1 4, is arranged in a cylindrical shape, and a convex structure is formed between outer conductor 2 5 and outer conductor 1 4, which together with inner conductor 2 form the main body of dual-mode high-frequency cavity 1;

[0038] End plate 2 6, one end of end plate 2 6 is fixedly connected to the other end of outer conductor 2 5, and is used to seal the other end of outer conductor 2 5;

[0039] Through hole 7 is located in the middle of end plate 2 6. Through hole 7 corresponds to the position of inner conductor 2. Electrons are accelerated and then leave through through hole 7.

[0040] Multiple piston-type tuners 8 are electrically connected to an external power supply via an external switch. The electronic control system drives the piston rod and tuner to move in the vertical direction. Two piston-type tuners 8 are fixedly installed on the top of the outer walls of outer conductor 1 4 and outer conductor 2 5, respectively, and are used to tune the fundamental wave and the third harmonic.

[0041] The working principle of this invention is as follows: A convex structure is formed between outer conductor 2 5 and outer conductor 4, which together with inner conductor 2 forms the main body of dual-mode high-frequency cavity 1. The electromagnetic field distribution inside dual-mode high-frequency cavity 1 is simulated according to electromagnetic field simulation calculation and testing software. One piston-type tuner 8 is fixedly installed in the region with strong magnetic field and weak electric field of the fundamental wave and uniform distribution of electromagnetic field of the third harmonic wave. Another piston-type tuner 8 is fixedly installed in the region with strong magnetic field and weak electric field of the third harmonic wave and uniform distribution of electromagnetic field of the fundamental wave. The bottom of the piston-type tuner 8 is adjusted in a vertically deep position, thereby independently tuning the two frequencies of dual-mode high-frequency cavity 1.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-frequency independent tuning method for a dual-mode high-frequency cavity, characterized in that, The dual-mode high-frequency cavity (1) includes: The inner conductor (2) is located in the middle of the cavity of the dual-mode high-frequency cavity (1) and is used to allow electrons to pass through. End plate 1 (3), the middle part of which is fixedly inserted into one end of the inner conductor (2), is used to fix and install the inner conductor (2); Outer conductor 1 (4), one end of which is fixedly connected to the outer wall of end plate 1 (3); Outer conductor two (5), one end of which is fixedly connected to the other end of outer conductor one (4), and is arranged in a cylindrical shape; End plate two (6), one end of which is fixedly connected to the other end of outer conductor two (5); Through hole (7), the through hole (7) is located in the middle of end plate two (6); Multiple piston-type tuners (8) are disposed on the top of the outer walls of outer conductor one (4) and outer conductor two (5) and are configured to tune the fundamental frequency and the third harmonic; the dual-frequency independent tuning method includes the following steps: Step 1: Simulate the electromagnetic field distribution inside the dual-mode high-frequency cavity using electromagnetic field simulation calculation and testing software; Step 2: Based on the electromagnetic field distribution simulated in Step 1, find the region with a strong magnetic field and weak electric field of the fundamental wave and a uniform distribution of the electromagnetic field of the third harmonic, and use it to install the piston-type tuner for adjusting the fundamental wave. Step 3: Based on the electromagnetic field distribution simulated in Step 1, find the region with strong magnetic field and weak electric field of the third harmonic and uniform distribution of electromagnetic field of the fundamental wave, and use it to install the piston-type tuner for adjusting the third harmonic. Step 4: By adjusting the depth of the fundamental frequency piston tuner and the third harmonic piston tuner inside the cavity respectively, the two operating frequencies of the dual-mode high-frequency cavity can be tuned independently.

2. The dual-frequency independent tuning method for a dual-mode high-frequency cavity according to claim 1, characterized in that, Both the fundamental tuner and the third harmonic tuner are piston-type tuners. The fundamental tuner and the third harmonic tuner are located outside the dual-mode high-frequency cavity. The fundamental tuner is located in a region with a strong magnetic field, a weak electric field, and a uniform electromagnetic field of the third harmonic. The third harmonic tuner is located in a region with a strong magnetic field, a weak magnetic field, and a uniform electromagnetic field of the fundamental.

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