阅读说明：本技术 回旋管高频腔体结构 (High-frequency cavity structure of gyrotron ) 是由 武春风 刘巧 秦建飞 易亮 刘洋 朱键华 于 2020-12-16 设计创作，主要内容包括：本发明公开了回旋管高频腔体结构,包括截止段、输入渐变波导段、主腔体段、主腔体凹部段、多个输出渐变波导段和输出直波导段,多个输出渐变波导段、输出直波导段、截止段均与输入渐变波导段连接,输入渐变波导段与主腔体段连接,主腔体段右端加入凹部段形成主腔体凹部段等；本发明可以有效地提高主模纵向高阶模式的Q值,从而降低该类模式的起振电流和电压；通过结合主腔体段及输出渐变波导段,以有效地实现可调频回旋管在超低电压电流状态下工作等。(The invention discloses a high-frequency cavity structure of a gyrotron, which comprises a cut-off section, an input gradual change waveguide section, a main cavity body concave section, a plurality of output gradual change waveguide sections and an output straight waveguide section, wherein the output gradual change waveguide sections, the output straight waveguide section and the cut-off section are all connected with the input gradual change waveguide section; the invention can effectively improve the Q value of the longitudinal high-order mode of the main mode, thereby reducing the starting oscillation current and voltage of the mode; the adjustable-frequency gyrotron can work under the state of ultralow voltage current and the like effectively by combining the main cavity section and the output gradual change waveguide section.)

1. The gyrotron high-frequency cavity structure is characterized by comprising a cut-off section (1), an input gradual change waveguide section (2), a main cavity body section (3), a main cavity body concave section (31), a plurality of output gradual change waveguide sections and output straight waveguide sections (7), wherein the output gradual change waveguide sections, the output straight waveguide sections (7) and the cut-off section (1) are all connected with the input gradual change waveguide section (2), the input gradual change waveguide section (2) is connected with the main cavity body section (3), and the concave section is added to the right end of the main cavity body section (3) to form the main cavity body concave section (31); the plurality of output tapered waveguide segments comprises a first output tapered waveguide segment (4), a second output tapered waveguide segment (5) and a third output tapered waveguide segment (6); the main cavity section (3) is connected with a first output gradual change waveguide section (4), the first output gradual change waveguide section (4) is connected with a second output gradual change waveguide section (5), the second output gradual change waveguide section (5) is connected with a third output gradual change waveguide section (6), and the third output gradual change waveguide section (6) is connected with an output straight waveguide section (7).

2. The gyrotron high-frequency cavity structure according to claim 1, wherein the first output tapered waveguide segment (4), the second output tapered waveguide segment (5) and the third output tapered waveguide segment (6) have the inclination angles of a first output tapered waveguide segment inclination angle a1, a second output tapered waveguide segment inclination angle a2 and a third output tapered waveguide segment inclination angle a3, respectively, and a1< a2< a3 < 5 °.

3. The high-frequency cavity structure of gyrotron as claimed in claim 1, wherein said main cavity section (3) has a total length L, L ≦ 15 λ, λ being the wavelength of the electromagnetic wave of the high-frequency cavity working mode.

4. The high-frequency cavity structure of gyrotron as claimed in claim 1, wherein said main cavity recess (31) is formed by a straight waveguide with radius R2 and left and right tapered waveguides, wherein the length of the straight waveguide is not higher than the wavelength of the electromagnetic wave at the working frequency of the high-frequency cavity, the angles of the left and right tapered waveguides are a4 and a5, respectively, and the sizes of a4 and a5 are less than 5 degrees.

5. Convolute duct high frequency cavity structure according to claim 1, wherein said main cavity concave section (31) is curvilinear in shape.

6. The gyrotron high-frequency cavity structure according to claim 1, wherein the number of the plurality of output tapered waveguide sections is controlled to be within 3 to 5, and the inclination angles of the plurality of output tapered waveguide sections are different from each other and are less than 5 °.

7. The convolute duct high frequency cavity structure of claim 1 wherein said cavity comprises a metallic structural material.

Technical Field

The invention relates to the technical field of gyrotrons, in particular to a high-frequency cavity structure of a gyrotron.

Background

A gyrotron, one of electric vacuum devices, is applied to fields with many special requirements due to its excellent performance in terms of high frequency, wherein it is a basic operation principle of the gyrotron that a cyclotron electron beam and an electromagnetic wave interact in a high frequency cavity of the gyrotron to generate or amplify an electromagnetic signal. With the development of millimeter wave terahertz wave technology in recent years, gyrotrons are widely applied to various systems as source devices, such as magnetic confinement controllable thermonuclear fusion, ceramic sintering, advanced material heat treatment, plasma diagnosis, dynamic nuclear polarization-nuclear magnetic resonance, terahertz imaging and the like. For some applications, it is particularly desirable that the gyrotron has a continuously tunable function, and that the operating current and voltage thereof are as small as possible to reduce the complexity of the system. Thus, miniaturization and even miniaturisation of the gyrotron is the key to reducing the overall system size. In miniaturized or miniaturized gyrotrons, ultra-low current-voltage operation is the key direction to reduce system volume. Since the oscillation of the primary mode in the gyrotron requires an operating current higher than the lowest oscillation starting current of the mode, and the oscillation starting current I_oscThe voltage is in inverse relation with the working voltage and the Q value of the cavity; therefore, in order to reduce the operating voltage and current of the gyrotron as much as possible, the Q value of the high-frequency cavity needs to be increased. Based on the traditional method, the Q value of the cavity is improved mainly by means of increasing the length of the main cavity. For the tunable performance of the gyrotron, the tunable performance is mainly realized in a mode that a high-frequency cavity works in a longitudinal high-order mode (TEm.p.q. (q ═ 1,2,3 …); however for TEm.p.q (q)>1) Mode Q is much smaller than TEm.p.1 mode, in order to increase TEm.p.q (q.q.q.s.>1) The Q value of the mode requires a further enlargement of the length of the main cavity. It is known from the fundamental principle of the convoluted tube that the longer the length of the main cavity is, the more easily the main cavity causes unnecessary parasitic mode oscillation, thereby affecting the operation of the main mode and the stability of the whole tube. In summary, how to do not excessivelyOn the premise of increasing the length of the main cavity of the high-frequency cavity, the mode Q value of the cavity TEm.p.q (Q is 1,2,3 …) is the key for realizing that the frequency-adjustable gyrotron works in an ultra-low voltage current state and simultaneously realizing that the principal mode of the gyrotron stably works.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a gyrotron high-frequency cavity structure, and can effectively improve the Q value of a longitudinal high-order mode of a main mode, thereby reducing the starting oscillation current and voltage of the mode; the adjustable-frequency gyrotron can work under the state of ultralow voltage current and the like effectively by combining the main cavity section and the output gradual change waveguide section.

The purpose of the invention is realized by the following scheme:

the gyrotron high-frequency cavity structure comprises a cut-off section, an input gradual change waveguide section, a main cavity body concave section, a plurality of output gradual change waveguide sections and an output straight waveguide section, wherein the output gradual change waveguide sections, the output straight waveguide section and the cut-off section are all connected with the input gradual change waveguide section; the plurality of output tapered waveguide segments comprises a first output tapered waveguide segment, a second output tapered waveguide segment, and a third output tapered waveguide segment; the main cavity section is connected with a first output gradual change waveguide section, the first output gradual change waveguide section is connected with a second output gradual change waveguide section, the second output gradual change waveguide section is connected with a third output gradual change waveguide section, and the third output gradual change waveguide section is connected with an output straight waveguide section.

Further, the inclination angles of the first output tapered waveguide section, the second output tapered waveguide section and the third output tapered waveguide section are respectively a first output tapered waveguide section inclination angle a1, a second output tapered waveguide section inclination angle a2 and a third output tapered waveguide section inclination angle a3, and a1< a2< a3 is less than or equal to 5 °.

Further, the total length of the main cavity body section is L, L is less than or equal to 15 lambda, and lambda is the wavelength of the electromagnetic wave in the high-frequency cavity body working mode.

Further, the main cavity concave section is composed of a straight waveguide with a radius of R2 and left and right tapered waveguides, wherein the length of the straight waveguide section is not higher than the wavelength of the electromagnetic wave at the operating frequency of the high-frequency cavity, the angles of inclination of the left and right tapered waveguides are a4 and a5, respectively, and the sizes of a4 and a5 are both less than 5 degrees.

Further, the shape of the main cavity recess section 31 is curved.

Further, the number of the output tapered waveguide sections is controlled within 3-5, and the inclination angles of the output tapered waveguide sections are different and are all smaller than 5 degrees.

Further, the cavity is made of a metal structure material.

The invention has the beneficial effects that:

the invention can effectively improve the Q value of the longitudinal high-order mode of the main mode, thereby reducing the starting oscillation current and voltage of the mode; the adjustable-frequency gyrotron can work under the state of ultralow voltage current and the like effectively by combining the main cavity section and the output gradual change waveguide section.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 shows an exemplary operating mode TE of the present invention_10.2.q(q-1, 2,3,4,5) mode start-up current case;

in the figure, 1-stop, 2-input tapered waveguide section, 3-main cavity section, 31-main cavity recess section, 4-first output tapered waveguide section, 5-second output tapered waveguide section, 6-third output tapered waveguide section, 7-output straight waveguide section, a 1-first output tapered waveguide section tilt angle, a 2-second output tapered waveguide section tilt angle, a 3-third output tapered waveguide section tilt angle, R1-main cavity radius, R2-radius of straight waveguide of recess section at end of main cavity, a 4-tilt angle of right tapered waveguide of recess section, a 5-tilt angle of left tapered waveguide of recess section, length of L-main cavity section 3.

Detailed Description

All of the features disclosed in the specification for all of the embodiments (including any accompanying claims, abstract and drawings), or all of the steps of a method or process so disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.

As shown in fig. 1 and 2, the high-frequency cavity structure of the gyrotron includes a stop segment 1, an input tapered waveguide segment 2, a main cavity segment 3, a main cavity recess segment 31, a plurality of output tapered waveguide segments and an output straight waveguide segment 7, wherein the plurality of output tapered waveguide segments, the output straight waveguide segment 7 and the stop segment 1 are all connected with the input tapered waveguide segment 2, the input tapered waveguide segment 2 is connected with the main cavity segment 3, and a recess segment is added to the right end of the main cavity segment 3 to form the main cavity recess segment 31; the plurality of output tapered waveguide segments comprises a first output tapered waveguide segment 4, a second output tapered waveguide segment 5 and a third output tapered waveguide segment 6; the main cavity section 3 is connected with a first output gradual change waveguide section 4, the first output gradual change waveguide section 4 is connected with a second output gradual change waveguide section 5, the second output gradual change waveguide section 5 is connected with a third output gradual change waveguide section 6, and the third output gradual change waveguide section 6 is connected with an output straight waveguide section 7.

Further, the first output tapered waveguide segment 4, the second output tapered waveguide segment 5 and the third output tapered waveguide segment 6 have the inclination angles of a first output tapered waveguide segment inclination angle a1, a second output tapered waveguide segment inclination angle a2 and a third output tapered waveguide segment inclination angle a3 respectively, and a1< a2< a3 < 5 °.

Further, the total length of the main cavity section 3 is L, L is not more than 15 λ, and λ is the wavelength of the electromagnetic wave in the high-frequency cavity working mode.

Further, the main cavity recess section 31 is composed of a straight waveguide with a radius R2 and left and right tapered waveguides, wherein the length of the straight waveguide is not higher than the wavelength of the electromagnetic wave at the operating frequency of the high-frequency cavity, the angles of inclination of the left and right tapered waveguides are a4 and a5, respectively, and the sizes of a4 and a5 are both less than 5 degrees.

Further, the shape of the main cavity recess section 31 is curved.

Further, the number of the output tapered waveguide sections is controlled within 3-5, and the inclination angles of the output tapered waveguide sections are different and are all smaller than 5 degrees.

Further, the cavity is made of a metal structure material.

In another embodiment of the present invention, as shown in fig. 1, this embodiment provides a high-frequency cavity structure capable of realizing ultra-low current and voltage operation of a tunable gyrotron, the structure mainly includes: the waveguide structure comprises a cut-off section 1, an input gradual change waveguide section 2, a main cavity section 3, a concave section 31 at the right end of the main cavity, first, second and third output gradual change waveguide sections 4-6, an output straight waveguide section 7, the cut-off section is connected with the input gradual change waveguide section 2, the input gradual change waveguide section 2 is connected with the main cavity section 3, the concave section 31 is added at the right end of the main cavity section, the main cavity section 3 is connected with the first output gradual change waveguide section 4, the first output gradual change waveguide section 4 is connected with the second output gradual change waveguide section 5, the second output gradual change waveguide section 5 is connected with the third output gradual change waveguide section 6, and the third output gradual change waveguide section is connected with the output straight waveguide section 7.

Specifically, when the radius of the cutoff section is 2.4mm, the radius R1 of the main cavity is 2.617mm, the length is 15mm, the radius R2 of the straight waveguide of the concave section at the tail end of the main cavity is 2.6mm, the left and right inclination angles a4 and a5 of the concave section are both 2 degrees, the inclination angle a1 of the first output gradual change waveguide is 0.5 degree, the inclination angle a2 of the second output gradual change waveguide is 1.0 degree, and the inclination angle a3 of the third output gradual change waveguide is 2.5 degrees. The main mode of the high-frequency cavity is TE calculated_10.2.q(q ═ 1,2,3,4,5), where the resonant frequencies of the longitudinal harmonic modes are: TE_10.2.1The mode resonant frequency is 299.93GHz, TE_10.2.2The mode resonant frequency is 300.22GHz, TE_10.2.3The mode resonant frequency is 300.65GHz, TE_10.2.4The mode resonant frequency is 301.22GHz, TE_10.2.5The mode resonance frequency was 301.94 GHz. As shown in FIG. 2, when the operating voltage is 500V, TE_10.2.qThe (q is 1,2,3,4,5) mode oscillation starting current changes along with the magnetic field. As can be seen from FIG. 2, under the condition of 500V working voltage, the lowest oscillation starting current of the working mode with five working frequency points ranges from 0.03mA to 15 mA.

Other embodiments than the above examples may be devised by those skilled in the art based on the foregoing disclosure, or by adapting and using knowledge or techniques of the relevant art, and features of various embodiments may be interchanged or substituted and such modifications and variations that may be made by those skilled in the art without departing from the spirit and scope of the present invention are intended to be within the scope of the following claims.

The functionality of the present invention, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium, and all or part of the steps of the method according to the embodiments of the present invention are executed in a computer device (which may be a personal computer, a server, or a network device) and corresponding software. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, or an optical disk, exist in a read-only Memory (RAM), a Random Access Memory (RAM), and the like, for performing a test or actual data in a program implementation.