CN111313130A

CN111313130A - Waveguide switch for switching transmission direction of high-power electron cyclotron wave

Info

Publication number: CN111313130A
Application number: CN201911067609.XA
Authority: CN
Inventors: 夏冬辉; 田一哲; 王之江
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-06-19
Anticipated expiration: 2039-11-04
Also published as: CN111313130B

Abstract

The invention discloses a waveguide switch for switching transmission directions of high-power electronic cyclotron waves, which comprises a waveguide switch cavity, a reflector, a driving motor and first to fifth straight-through circular waveguide sections with the same size, wherein the centers of the front, rear, left, right and top five surfaces of the waveguide switch cavity are respectively provided with a circular hole with the same size, the circular holes are respectively butted with the first to fifth straight-through circular waveguide sections, the reflector is arranged in the waveguide switch cavity, the rapid switching between 4 transmission directions can be realized, and the design of the waveguide switch can meet the requirement of a large Tokamak device on rapid switching among a plurality of sets of ECRH systems. In addition, the waveguide switch is simple in structure and low in processing difficulty, the beam radius of the high-power electron cyclotron wave before and after passing through the waveguide switch is not obviously dispersed through the ellipsoidal mirror surface design of the reflecting mirror surface, and transmission is efficient and stable.

Description

Waveguide switch for switching transmission direction of high-power electron cyclotron wave

Technical Field

The invention belongs to the technical field of microwaves, and particularly relates to a waveguide switch for switching the transmission direction of a high-power electron cyclotron wave.

Background

In the current magnetic confinement controlled thermonuclear fusion experimental research, Electron Cyclotron Resonance Heating (ECRH) is a widely used plasma Heating means, and has the characteristics of good Heating effect, good Heating locality, high current driving efficiency, capability of keeping an antenna away from plasma and the like. The ECRH system mainly comprises a wave source system, a transmission system, an antenna system, a control and protection system and the like, and the power of a single set of system is usually between 200kW and 1 MW. The common ECRH system has the working frequency range of 30-200 GHz. Now consider the following two cases: 1. a large tokamak device is usually provided with a plurality of sets of ECRH systems working at different frequency points to meet the requirements of physical experiments, so that the device needs to have the capability of switching among different ECRH systems; 2. the ECRH system should have the capability of switching at least the high power electron cyclotron to two different directions to satisfy the requirement of the power measurement of the system itself. Therefore, a waveguide switch capable of switching the transmission direction of the high-power electron cyclotron wave is needed, and the waveguide switch can be suitable for working occasions with different frequencies.

At present, a common waveguide switch in the field usually adopts a mode of laying a slide rail in a cavity of the waveguide switch, a plane reflector and a straight-through waveguide section are placed on the slide rail, and the plane reflector and the straight-through waveguide section are driven to move on the slide rail through an external motor, so that the high-power electron cyclotron wave can be switched between two different transmission directions. However, the method cannot meet the application requirement under the first situation, and has a high requirement on the processing precision of the length of the slide rail, otherwise, the generated error finally easily causes the problem of collimation of the planar reflector or the straight-through waveguide section and the waveguide outside the waveguide switch cavity, the transmission efficiency of the high-power electron cyclotron wave is influenced slightly, and the ignition accident is caused seriously, so that the system safety is damaged.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a waveguide switch for switching the transmission direction of a high-power electron cyclotron wave, and aims to solve the problem that the direction of the conventional waveguide switch is less in switching among a plurality of sets of ECRH systems.

In order to achieve the purpose, the invention provides a waveguide switch for switching the transmission direction of a high-power electron cyclotron, the frequency of the high-power electron cyclotron in the application occasion of the waveguide switch is 30 GHz-200 GHz, the power is 200 kW-1 MW, and the waveguide switch comprises a waveguide switch cavity, a reflector, a driving motor and first to fifth straight-through circular waveguide sections with the same size;

the centers of the front, rear, left, right and top five surfaces of the waveguide switch cavity are respectively provided with round holes with the same size so as to be respectively butted with the first through fifth straight-through circular waveguide sections; the reflector is arranged in the waveguide switch cavity, and the driving motor is arranged in the reflector base to realize rotation control of the reflector.

Preferably, the waveguide switch cavity is a cubic cavity.

Preferably, the mirror is an ellipsoidal mirror.

Preferably, the mirror is rotatable about the central axis of the fifth through-waveguide section to 4 different positions, in each of which the projections of the longitudinal sections of the first through fourth through-waveguide sections onto the plane of the mirror completely coincide with the ellipsoidal contour of the mirror.

Preferably, the projection of the longitudinal section of the fifth straight-through circular waveguide section onto the plane of the mirror completely coincides with the ellipsoidal contour of the mirror.

Preferably, the reflector also has the function of focusing the electron cyclotron wave beam while changing the transmission direction of the electron cyclotron wave, so that the beam radius of the high-power electron cyclotron wave incident from the first through circular waveguide section to the fourth through circular waveguide section is not changed after the high-power electron cyclotron wave exits from the fifth through circular waveguide section, and the reverse direction is also applicable.

Preferably, the reflector can be conveniently taken out from the bottom of the waveguide switch and replaced by an ellipsoidal reflector with other parameters (ellipsoidal height, ellipsoidal minor axis, ellipsoidal focal length, ellipsoidal major axis, ellipsoidal minor axis and the like) so as to adapt to high-power electron cyclotron waves with different frequencies.

Preferably, the driving motor realizes parameter setting and rotation control through 1 set of motor control system.

Preferably, the first through fifth straight-through circular waveguide segments are all standard circular waveguides.

Compared with the prior art, the invention has the advantages that the easy-to-detach ellipsoidal reflector driven by the motor to rotate is installed in the waveguide switch cavity, so that the switchable transmission directions of the waveguide switch are improved to 4, and the design of the waveguide switch can meet the requirement of a large Tokamak device on quick switching among multiple sets of ECRH systems. In addition, the waveguide switch is simple in structure and low in processing difficulty, so that influence caused by processing errors is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a waveguide switch for switching a transmission direction of a high-power electron cyclotron according to an embodiment of the present invention;

FIG. 2 is a side cross-sectional view of a waveguide switch provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic diagram of an internal structure of a waveguide switch according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the present invention provides a waveguide switch for switching transmission directions of a high-power electron cyclotron, wherein the frequency of the high-power electron cyclotron in the application occasion of the waveguide switch is 30GHz to 200GHz, the power of the waveguide switch is 200kW to 1MW, and the waveguide switch comprises a waveguide switch cavity 1, an ellipsoidal reflector 2, a driving motor 3, and first to fifth straight circular waveguide sections 4 to 8 with the same size; a side cross-sectional view is shown in fig. 2.

The waveguide switch cavity 1 is a cubic cavity, and round holes with the same size are formed in the centers of the front, rear, left, right and top five surfaces of the waveguide switch cavity so as to be respectively butted with the first through fifth straight-through circular waveguide sections 4-8; the reflector 2 is arranged in the waveguide switch cavity 1, and the driving motor 3 is arranged in the base of the reflector 2, so that the rotation control of the reflector 2 is realized.

The ellipsoidal reflector is respectively rotated by 90 degrees, 180 degrees and 270 degrees clockwise/anticlockwise by controlling the driving motor 3, the ellipsoidal reflector can be rotated to 4 different positions around the central axis of the fifth through waveguide section, the projection of the longitudinal section of each through circular waveguide section 4-7 on the plane where the reflector is located is completely coincided with the outline of the ellipsoidal reflector at each specific position, and meanwhile, the projection of the longitudinal section of the top through circular waveguide section 8 on the plane where the ellipsoidal reflector 2 is located is always completely coincided with the outline of the ellipsoid reflector 2. Through the operation, the switching of the high-power electron cyclotron wave from the straight-through circular waveguide section 8 to the straight-through circular waveguide sections 4-7 in any direction can be realized, and the reverse direction is also applicable.

As shown in fig. 3, an internal structure diagram of a waveguide switch for switching the transmission direction of a high-power electron cyclotron wave. The size of the ellipsoidal reflector 2 is designed for the transmitted high-power electron cyclotron wave with specific frequency, and the focusing function of the ellipsoidal reflector can ensure that the beam radius of the high-power electron cyclotron wave incident from the A-A 'plane at the tail end of the through circular waveguide section 7 can not be obviously changed after the high-power electron cyclotron wave exits from the B-B' plane at the tail end of the through circular waveguide section 8, so that the adverse effect caused by the divergence of the beam radius of the high-power electron cyclotron wave in the free space transmission process in the waveguide switch cavity can be counteracted. The reverse direction transmission is also possible. Similarly, the transmission between the end of the straight circular waveguide segment 8 and the end of any other straight circular waveguide segment has the above-mentioned effects.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A waveguide switch for switching the transmission direction of a high-power electron cyclotron wave is characterized by comprising a waveguide switch cavity (1), a reflector (2), a driving motor (3) and first to fifth straight-through circular waveguide sections (4) to (8) with the same size;

the centers of the front, rear, left, right and top five surfaces of the waveguide switch cavity (1) are provided with round holes with the same size, and the round holes are respectively butted with the first through fifth straight-through round waveguide sections (4) to (8); the reflector (2) is arranged in the waveguide switch cavity (1), and the driving motor (3) is arranged in the reflector (2) base to realize rotation control of the reflector (2).

2. A waveguide switch according to claim 1, characterized in that the waveguide switch cavity (1) is a cubic cavity.

3. A waveguide switch according to claim 1, characterized in that the mirror (2) is an ellipsoidal mirror.

4. A waveguide switch according to claim 3, characterized in that the reflector (2) is rotatable about the central axis of the fifth straight-through circular waveguide section to 4 different positions, each position being such that the projections of the longitudinal sections of the first to fourth straight-through circular waveguide sections (4) to (7) onto the plane of the reflector (2) completely coincide with the ellipsoidal contour of the reflector (2).

5. A waveguide switch according to claim 3, characterized in that the projection of the longitudinal section of the fifth straight-through circular waveguide section (8) onto the plane in which the mirror (2) lies completely coincides with the ellipsoidal contour of the mirror (2).

6. A waveguide switch according to claim 3, characterized in that said mirror (2) also has the function of focusing the electron cyclotron wave beam while changing the direction of propagation of the electron cyclotron wave, so that the high-power electron cyclotron wave incident from the first to fourth straight circular waveguide sections (4) to (7) will have a constant beam radius after emerging from the fifth straight circular waveguide section (8), and the same applies to the opposite direction.

7. A waveguide switch according to claim 1, characterized in that the mirror (2) comprises an ellipsoidal reflecting surface, the parameters of which are determined according to the frequency of the electron cyclotron wave.

8. A waveguide switch according to claim 1, characterized in that the drive motor (3) is adapted to achieve its parameter setting and rotation control by means of 1 motor control system.

9. A waveguide switch according to claim 1, characterized in that the first to fifth straight-through circular waveguide sections (4) to (8) are all circular waveguides.