CN106935942B - Quick controllable polarizer of high-power electron cyclotron resonance heating system - Google Patents
Quick controllable polarizer of high-power electron cyclotron resonance heating system Download PDFInfo
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- CN106935942B CN106935942B CN201511023303.6A CN201511023303A CN106935942B CN 106935942 B CN106935942 B CN 106935942B CN 201511023303 A CN201511023303 A CN 201511023303A CN 106935942 B CN106935942 B CN 106935942B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/165—Auxiliary devices for rotating the plane of polarisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/165—Auxiliary devices for rotating the plane of polarisation
- H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
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Abstract
The invention belongs to the technical field of microwaves, and particularly relates to a rapid controllable polarizer of a high-power electron cyclotron resonance heating system. The invention comprises a microwave reversing waveguide, a mounting substrate, a polarizer rotating mechanism and a rotation driving mechanism; the microwave reversing elbow is used for transmitting high-power microwaves and realizing 90-degree reversing of the microwave transmission direction; the mounting substrate is used for positioning the polarizer and the rotation and driving mechanism thereof on the microwave reversing elbow; the polarizer is used for reflecting the microwave and realizing the change of the polarization form of the microwave when the polarizer rotates; the polarizer rotating mechanism is used for realizing the rotation of the polarizer in a vacuum environment; the rotation driving mechanism is used for realizing the accurate positioning control and protection of the rotation of the polarizer; the invention has high positioning precision, is rapid and controllable in remote, can stably and efficiently transmit MW-magnitude long-pulse millimeter waves, and can meet the requirements of an electron cyclotron system on arbitrary control of microwave polarization forms.
Description
Technical Field
The invention belongs to the technical field of microwaves, and particularly relates to a rapid controllable polarizer of a high-power electron cyclotron resonance heating system.
Background
In electron cyclotron resonance heating systems, the microwave reaching the resonance layer requires a specific microwave polarization form to develop either the ordinary (O) mode or the extraordinary (X) mode heating. The proportion of the O mode and the X mode changes depending on the microwave polarization form and the incidence angle, and the microwave polarization form must be changed while the plasma operation parameters or the microwave incidence angle are changed so as to achieve the high-efficiency coupling of the wave and the plasma. The microwaves output by the wave source gyrotron are generally linearly polarized waves, and generally, a polarizer is required to change the polarization mode of the waves in the wave transmission process so as to obtain elliptically polarized waves or circularly polarized waves capable of efficiently coupling the waves and the plasma.
The polarizer in the prior art is mainly applied to an electron cyclotron non-vacuum transmission system with the power of 500MW and the pulse width of 1s, and has the following defects: the rotation of the polarizer can be controlled only manually, and the response speed is low, the precision is low, so that the polarizer cannot be linked with an antenna in real time, and the high-efficiency coupling of waves and plasma is ensured; only one polarizer is configured in a transmission system, only the change of microwave polarization form within a certain range can be realized, and the random control of microwave polarization characteristic cannot be realized, so that the coupling efficiency of wave and plasma is reduced; the power transmission device can only be used in a non-vacuum environment and cannot meet the requirement of the existing electron cyclotron single system for transmitting MW-magnitude power.
Disclosure of Invention
Aiming at the prior art, the invention provides a rapid controllable polarizer of a high-power electron cyclotron resonance heating system, which is used for solving the technical problems that the prior art cannot be used in an electron cyclotron vacuum transmission system, can only be operated manually, so that the positioning precision is not high, and the high-efficiency coupling with an antenna can not be realized due to automatic matching; the invention also aims to solve the technical problems of rapid rotation of the polarizer, high positioning precision and accurate control of the rotation angle and the like under the vacuum condition so as to ensure that the polarizer rotates smoothly, reliably and accurately under the vacuum environment.
In order to solve the technical problem, the invention provides a rapid controllable polarizer of a high-power electron cyclotron resonance heating system, which comprises a microwave reversing elbow, a mounting substrate, a polarizer rotating mechanism and a rotation driving mechanism, wherein the mounting substrate is provided with a first end and a second end;
the microwave reversing elbow is connected with the electronic cyclotron transmission system and used for transmitting high-power microwaves and realizing 90-degree reversing of the microwave transmission direction;
the mounting substrate is arranged on the microwave reversing elbow and used for arranging the polarizer, the polarizer rotating mechanism and the rotation driving mechanism on the microwave reversing elbow;
the polarizer rotating mechanism is used for realizing the rotation of the polarizer in a vacuum environment;
the rotation driving mechanism is used for realizing the accurate positioning control and protection of the rotation of the polarizer.
The microwave reversing elbow is an integrated reversing elbow; the inner wall of the microwave reversing elbow is a smooth curved surface.
And further processing the hard aluminum material of the microwave reversing elbow.
And the microwave reversing elbow is in butt joint with the electronic cyclotron transmission system through a connecting flange, and a static sealing O-shaped ring is arranged between the microwave reversing elbow and the electronic cyclotron transmission system to realize vacuum sealing.
Furthermore, a hole is formed in the center of the mounting substrate, the mounting substrate is connected with the microwave reversing elbow through a screw, and a static sealing O-shaped ring is arranged between the mounting substrate and the microwave reversing elbow to realize vacuum sealing.
The polarizer rotating mechanism further comprises a supporting bearing, a bearing seat and a rotating shaft; the bearing frame is a stepped cylindrical structure, the rotating shaft penetrates through the bearing frame, a supporting bearing is arranged between the rotating shaft and the upper section of the bearing frame, a multi-stage dynamic sealing O-shaped ring is arranged between the lower section of the rotating shaft and the bearing frame, and the lower end of the bearing frame is fixed on the mounting substrate.
And further, the bearing seat is connected with the mounting substrate through a screw, and a static sealing O-shaped ring is arranged between the bearing seat and the mounting substrate to realize vacuum sealing.
The rotation driving mechanism further comprises a rotating platform, a coupler, a motor, a turbine and a worm; the motor drives the worm to rotate through the coupler, the worm drives the worm wheel to rotate, the worm wheel drives the rotating platform to rotate, the rotating platform drives the rotating shaft to rotate, and the rotating shaft drives the polarizer to rotate.
Further the rotation driving mechanism further comprises an emergency manual adjusting device and an emergency manual adjusting device which are arranged on the motor, and the emergency braking protection of the motor is guaranteed to be achieved under the conditions of power failure and control failure.
The rotating platform further comprises an upper cover plate and an outer sleeve, the outer sleeve is sleeved outside the bearing seat, a non-circular hole is formed in the center of the upper end cover, the upper cover plate covers the outer sleeve, the rotating platform is in clearance fit with the bearing seat, and the rotating platform rotates around the bearing seat; the upper part of the rotating shaft is matched with a central non-circular hole of the upper cover plate of the rotating platform.
Further the polariscope is arranged in a cavity formed by the mounting substrate and the microwave reversing elbow, the surface of the polariscope faces towards the microwave inlet and forms a 45-degree included angle with the incident direction of the microwave, the rotating shaft is of a stepped cylindrical structure, the lower end of the rotating shaft penetrates through a central opening of the mounting substrate and is connected with the back of the polariscope, and the radius of the central opening of the mounting substrate is smaller than that of the polariscope.
The polarizer is a diffraction grating polarizer and is used for reflecting microwaves and realizing the change of the polarization form of the microwaves when the polarizer rotates.
The polarizer is a vector diffraction grating polarizer, and the mirror surface of the polarizer is processed with a uniform symmetrical groove structure.
Further the polarizer mirror finished uniform symmetrical flute configuration is a rectangular flute configuration or a non-rectangular flute configuration.
Further the polarizer mirror finished uniform symmetrical flute structure is a continuous sinusoidal corrugation structure.
Furthermore, the central position of the continuous sine wave structure of the polarized mirror surface is a wave trough.
Further, the polarizer is made of an oxygen-free copper material.
Further, the amplitude and the period of the sine wave of the continuous sine wave ripple structure on the surface of the polarizer are determined according to the wavelength of the microwave, the incident angle of the microwave, the reflection angle of the microwave, the rotation angle alpha of the elliptic main shaft of the polarizer and the ellipticity beta angle of the polarizer.
Further the polarizer mirror facets are of continuous sinusoidal corrugated structure f (x) ═ d cos (2 π x/p)/2, where d denotes flute depth, units, mm; p represents flute period, unit, mm; x represents the transverse cross-sectional direction of the flutes.
Furthermore, when the groove depth of the polarizer mirror surface is different multiples of the microwave wavelength, the elliptical polarization parameter and the linear polarization parameter of the microwave can be respectively changed.
Further the depth of the grooves of the polarizer mirror surfaces is selected to be 0.35 times the wavelength of the microwaves.
The flute depth of the polarizer mirror surface of the microwave elliptical polarization parameter is further changed to be 0.3 times of the wavelength of the microwave, and the flute depth of the polarizer mirror surface of the microwave linear polarization parameter is changed to be 0.434 times of the wavelength of the microwave.
The polarizer further comprises a rotation control system, the rotation control system comprises a controller and a logic controller, and the controller accurately acquires the rotation direction information of the polarizer in real time; the logic controller carries out remote parameter setting and rotation control on the motor and communicates with the electronic rotary main control system through the Ethernet.
The rotation control system is further used for setting remote parameters of the motor and controlling rotation; the control mode of the motor is a pulse control mode.
Further the output hole internal diameter of turbine is 60 mm.
And further, the static sealing O-shaped ring is of a metal sealing ring structure.
Further, the static sealing O-shaped ring is a Helicoflex type metal sealing ring.
Furthermore, a multistage dynamic sealing O-shaped ring arranged between the rotating shaft and the bearing seat is a Wilson dynamic sealing structure; lubricating grease with high viscosity and small volatility is filled between the multi-stage dynamic sealing O-shaped rings.
Furthermore, the number of stages of the multi-stage dynamic sealing O-shaped rings arranged between the rotating shaft and the bearing seat is 3 or more than 3.
And furthermore, the resolution of the rotating platform is less than 0.1 degrees, and the repeated positioning precision is less than 0.01 degrees.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
(1) the groove structure of the polarizer is reasonably and optimally designed to meet the requirement of any polarization;
(2) the invention meets the requirement of the rotational positioning precision to ensure that the microwave is injected into the plasma in a specific polarization mode;
(3) the high-power long-pulse millimeter wave transmission component requires that microwave power loss caused by the polarizer is as small as possible so as to ensure the efficiency of a transmission system;
(4) the invention allows for a fast controllable polarizer to be usedThe vacuum degree of the vacuum transmission system is 10- 3Pa, vacuum leak rate requirement of 10-9Pa·m3/s；
(5) The invention can carry out remote accurate control in a control room, so that a worker can conveniently execute the rotation action of the polarizer during the experiment and can realize the linkage control with the antenna;
(6) the rapid controllable polarizer of the electron cyclotron resonance heating system is suitable for an electron cyclotron MW magnitude vacuum transmission system, can realize reliable, accurate and rapid rotation control of a polarizer, and can realize the polarizer with freely changed microwave polarization form, high positioning accuracy and remote rapid control.
Drawings
FIG. 1 is a front view of a fast controllable polarizer of a high power ECR heating system according to the present invention;
FIG. 2 is a top view of a fast controllable polarizer of a high power ECR heating system according to the present invention;
FIG. 3 is a cross-sectional view of a fast controllable polarizer of a high power ECR heating system according to the present invention;
FIG. 4 is a schematic diagram of a fast controllable polarizer rotating mechanism and a rotating driving mechanism of a high power electron cyclotron resonance heating system according to the present invention;
FIG. 5 is a schematic diagram illustrating the microwave polarization parameters defining the principal axis rotation angle α and the ellipticity β;
FIG. 6 is a schematic view of a polarizer of a fast controllable polarizer of a high power ECR heating system according to the present invention;
FIG. 7 is a comparison graph of the theoretical calculation of the elliptical polarizer and the actual measurement result of low power according to the present invention;
FIG. 8 is a graph comparing the theoretical calculation of the linear polarizer and the actual measurement result of low power according to the present invention;
in the figure: the method comprises the following steps of 1-microwave reversing elbow, 2-mounting base plate, 3-polarizer, 4-static sealing O-shaped ring, 5-dynamic sealing O-shaped ring, 6-supporting bearing, 7-bearing seat, 8-rotating shaft, 9-rotating platform, 10-coupler, 11-motor, 12-emergency manual adjusting device, 13-turbine and 14-worm.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 4, the invention relates to a fast controllable polarizer of a high power electron cyclotron resonance heating system, comprising: the device comprises a microwave reversing elbow 1, a mounting substrate 2, a polarizer 3, a static sealing O-shaped ring 4, a dynamic sealing O-shaped ring 5, a support bearing 6, a bearing seat 7, a rotating shaft 8, a rotating platform 9, a coupler 10, a motor 11, an emergency manual adjusting device 12, 13-a turbine and 14-a worm;
the microwave reversing elbow 1 is connected with the electronic cyclotron transmission system and used for transmitting high-power microwaves and realizing 90-degree reversing of the microwave transmission direction; the loss problem of the reversing elbow is comprehensively considered, the microwave reversing elbow 1 is an integrated reversing elbow, namely, the input and output waveguide sections and the elbow are processed into an integral workpiece; considering the need of high-efficiency low-consumption transmission of high-power long-pulse millimeter waves, the inner wall of the microwave reversing elbow 1 is a smooth curved surface; the problem of ohmic loss during microwave transmission is comprehensively considered, and the microwave reversing elbow 1 is made of hard aluminum materials suitable for a high-power microwave transmission system; the path of a guided wave channel of an input/output port of the microwave reversing elbow 1 is consistent with that of a guided wave component of a transmission system, the guided wave channel is in butt joint with the guided wave component of the electron cyclotron transmission system through a connecting flange, and a static sealing O-shaped ring is arranged between the guided wave channel and the guided wave component of the electron cyclotron transmission system to realize vacuum sealing; the static sealing O-shaped ring is of a metal sealing ring structure, and preferably a Helicoflex metal sealing ring;
a hole is formed in the center of the mounting substrate 2 and is arranged on the microwave reversing elbow 1, the mounting substrate 2 is connected with the microwave reversing elbow 1 through a screw, and a static sealing O-shaped ring 4 is arranged between the mounting substrate 2 and the microwave reversing elbow 1 to realize vacuum sealing; the static sealing O-shaped ring 4 is of a metal sealing ring structure, and preferably a Helicoflex metal sealing ring; the mounting substrate 2 is used for arranging the polarizer 3 and the rotating mechanism and the driving mechanism thereof on the microwave reversing elbow 1;
the polarizer 3 is positioned in a cavity formed by the mounting substrate 2 and the microwave reversing elbow 1, the mirror surface faces inwards to the cavity and forms an included angle of 45 degrees with the microwave incidence direction, the rotating shaft 8 is of a stepped cylindrical structure, the lower end of the rotating shaft 8 penetrates through a central opening of the mounting substrate 2 to be connected with the back of the polarizer 3, and the radius of the central opening of the mounting substrate 2 is smaller than that of the polarizer 3;
the polarizer 3 is a diffraction grating polarizer and is used for reflecting microwaves and realizing the change of the microwave polarization form when the polarizer rotates; in order to realize the change of microwave polarization parameters, the polarizer 3 is a vector diffraction grating polarizer, and the mirror surface of the polarizer 3 is a uniform symmetrical groove structure; in order to avoid point discharge, the mirror surface of the polarizer 3 adopts a continuous sine ripple structure; the central position of the continuous sine ripple structure of the polarized mirror 3 is a wave trough; the requirements of ohmic loss, heat load, temperature rise and the like of microwaves reflected by the mirror surface of the polarizer 3 are comprehensively considered, and the polarizer 3 is made of an oxygen-free copper material; the corrugated waveguide ripple amplitude of the surface waveguide of the polarizer 3 is 1.08mm, and the period is 0.8 mm;
the polarizer rotating mechanism comprises a supporting bearing 6, a bearing seat 7 and a rotating shaft 8; the device is used for realizing the rotation of the polarizer 3 in a vacuum environment; the bearing seat 7 is of a cylindrical structure, the supporting bearings 6 are arranged on two sides of the upper section of the rotating shaft 8 and penetrate through the bearing seat 7, the dynamic sealing O-shaped ring 5 is arranged between two sides of the lower section of the rotating shaft 8 and the bearing seat 7, and the dynamic sealing O-shaped ring 5 is a Wilson dynamic sealing structure; the lower end of the bearing seat 7 is fixed on the mounting substrate 2; the bearing seat 7 is connected with the mounting substrate 2 through a screw, and a static sealing O-shaped ring 4 is arranged between the bearing seat 7 and the mounting substrate 2 to realize vacuum sealing;
the rotary platform 9 comprises an upper cover plate and an outer sleeve, the outer sleeve is sleeved outside the bearing seat 7, a non-circular hole is formed in the center of the upper end cover, the upper cover plate covers the outer sleeve, the rotary platform 9 is in clearance fit with the bearing seat 7, and the rotary platform 9 rotates around the bearing seat 7; the upper part of the rotating shaft 8 is matched with a central non-circular hole of an upper cover plate of the rotating platform 9; the resolution of the rotary platform 9 is less than 0.1 DEG, and the repeated positioning precision is less than 0.01 deg.
The rotation driving mechanism comprises a rotating platform 9, a coupler 10, a motor 11, an emergency manual adjusting device 12, a turbine 13 and a worm 14; the device is used for realizing the accurate positioning control and protection of the rotation of the polarizer 3; the motor 11 drives the worm 14 to rotate through the coupler 10, the worm 14 drives the worm wheel 13 to rotate, the worm wheel 13 drives the rotating platform 9 to rotate, the rotating platform 9 drives the rotating shaft 8 to rotate, and the rotating shaft 8 drives the polarizer 3 to rotate; the emergency manual adjusting device 12 is arranged on the motor 11, and ensures that the motor 11 can be braked emergently under the conditions of power failure and control failure; the motor 11 is a stepper motor, preferably a 42 series stepper motor.
The rotation control system comprises a controller and a logic controller and is used for setting remote parameters of the motor 11 and controlling rotation; the motor 11 is controlled by adopting a pulse control mode to realize high-precision rotation positioning; the controller has the function of accurately acquiring the rotation direction information of the polarizer in real time; the functions of the logic controller are to carry out remote parameter setting and rotation control on the motor, and the logic controller is communicated with the electronic convolution master control system through the Ethernet, so that the remote control and the safety interlocking of the polarizer are realized.
The driving rotary positioning of the motor 11 in the vacuum environment mainly has two solutions at present: firstly, the whole driving, transmission and execution mechanism is arranged in a vacuum environment, the structure adopts a motor and a transmission mechanism which need to be specially customized, and the heat dissipation and lubrication difficulty is extremely high; the other is to place the driving and transmission part outside the vacuum environment, and realize the dynamic sealing of the rotating part and the static part of the machine body through the traditional mechanical dynamic sealing mechanism, the sealing structure has large volume and complex structure, and the sealing effect is poor and the leakage point is more when the rotating shaft is static.
In order to solve two problems of vacuum sealing and accurate positioning when the polarizer rotates with low cost, the embodiment of the invention arranges the driving and transmission part outside a vacuum environment, adopts the motor 11 as a driving power source and adopts a pulse control mode to realize high-precision positioning, adopts the turbine 13, the worm 14 and the rotary platform 9 as transmission mechanisms to realize reverse locking of positioning, solves the problems that all mechanisms occupy excessive vacuum volume and have overlarge volume and high cost because of being arranged in a vacuum chamber, and has simple structure, convenient assembly and disassembly and convenient maintenance because the main mechanism is outside the vacuum environment;
in this embodiment, in order to solve the problem that the vacuum sealing cannot be realized between the stators of the ordinary turbine worm reducer, a standard turbine worm electric platform is modified:
1. the inner diameter of an output hole of the turbine 13 is determined to be increased according to the installation requirement of a rotating shaft mechanism of the polarizer 3, the inner diameter of the output hole of the turbine 13 is enabled to reach 60mm in the embodiment, so that the supporting problem of the polarizer 3 for installing the rotating shaft 8 is solved, and a space is reserved for realizing a sealing structure;
2. regarding the realization of vacuum sealing, considering that the pressure difference between the inside and the outside of a vacuum chamber is large, the single-stage O-shaped ring sealing is difficult to prevent leakage, through repeated tests, a multi-stage dynamic sealing O-shaped ring 5 is arranged between a rotating shaft 8 and a bearing seat 7, lubricating grease which is specially used in a vacuum environment and has high viscosity and small volatility is filled between the dynamic sealing O-shaped rings 5, and the reliability of sealing is ensured; preferably, more than 3 levels of dynamic sealing O-shaped rings 5 are arranged.
As shown in fig. 5, the polarization form of the microwave is determined by two parameters, i.e., the rotation angle α of the major axis of the ellipse (i.e., the angle between the major axis and the propagation direction of the wave) and the ellipticity β; the polarizer is a microwave device for changing the polarization form of microwaves; the amplitude and the period of the surface ripples of the polarizer are determined according to the wavelength, the incident angle and the reflection angle of the microwave and the alpha angle and the beta angle of the polarizer; because the wavelength of the microwave of the electron cyclotron resonance heating system is short, a quasi-optical method is generally adopted, and a vector diffraction grating polarizer is utilized to realize the purpose of changing the microwave polarization form, and the common methods include a mode matching method and a vector integration method, wherein the former method is mainly used for designing the rectangular grooved grating, and the latter method is mainly used for designing the non-rectangular grooved grating.
Considering that the power capacity of an electron cyclotron transmission system is required to reach 1MW, in order to improve the power capacity, the embodiment of the invention adopts non-rectangular grooves for design in the design process of the polarizer grating so as to avoid the problems of electric breakdown and the like at the grating in the operation process of the system.
As shown in fig. 6, the polarizer 3 of the present invention is a vector diffraction grating polarizer, and is designed with a sine wave structure; two polarizers with the groove depth of 1/4 and 1/8 are arranged in the electron cyclotron transmission system and are respectively used for changing the linear polarization parameter and the elliptical polarization parameter of microwave polarization, so that the polarization form can be changed randomly; the effect of the polarizer on changing polarization characteristics is closely related to grating groove structure, groove depth and period, and the linear polarizer groove structure determined in the embodiment of the invention is f (x) ═ d cos (2 pi x/p)/2, wherein d represents the groove depth and is unit mm; p represents flute period, unit, mm; x represents the transverse cross-sectional direction of the flutes. The flute depth of the mirror surface of the polarizer 3 is 0.35 times of the microwave wavelength, the flute depth of the polarizer 3 mirror surface with changed microwave elliptical polarization parameters is 0.3 times of the microwave wavelength, the flute depth of the polarizer 3 mirror surface with changed microwave elliptical polarization parameters is 0.86mm, the flute depth of the polarizer mirror surface with changed microwave linear polarization parameters is 0.434 times of the microwave wavelength, and the flute depth of the polarizer mirror surface with changed microwave linear polarization parameters is 1.24 mm.
FIGS. 7 and 8 are graphs comparing theoretical calculation and low power actual measurement results of the elliptical polarizer and the linear polarizer according to the present invention; the result is obtained through a low-power measuring platform, the low-power measuring platform comprises a wave source, a mode converter, a corrugated waveguide, a measured polarizer and a detector, and the measuring principle is as follows: when the rotation angle of the measured polarizer 3 is fixed, the measured data is processed by rotating the receiving antenna of the detector to obtain the rotation angle alpha and the elliptical angle beta parameter of the polarized wave, the rotation angle corresponding to the maximum value of the signal measured by the detector is the rotation angle alpha of the polarized wave, and the maximum value I of the signal measured by the detection crystal ismaxAnd a minimum value IminThe relation with the elliptical angle beta of the polarized wave is
Fig. 7 shows the test results of the elliptical polarizer and fig. 8 shows the test results of the linear polarizer, in which the abscissa indicates the rotation angle of the polarizer and the ordinate indicates the polarization parameters α and β; the test result shows that all the performances can meet the use requirement of the electron cyclotron system.
Claims (28)
1. A fast controllable polarizer for a high power electron cyclotron resonance heating system, the polarizer comprising: the microwave reversing elbow (1), a mounting substrate (2), a polarizer (3), a polarizer rotating mechanism and a rotation driving mechanism;
the microwave reversing elbow (1) is connected with the electronic cyclotron transmission system and is used for transmitting high-power microwaves and realizing 90-degree reversing of the microwave transmission direction;
the mounting substrate (2) is arranged on the microwave reversing elbow (1) and is used for arranging the polarizer (3), the polarizer rotating mechanism and the rotation driving mechanism on the microwave reversing elbow (1);
the polarizer rotating mechanism is used for realizing the rotation of the polarizer (3) in a vacuum environment;
the rotation driving mechanism is used for realizing the accurate positioning control and protection of the rotation of the polarizer (3);
the center of the mounting substrate (2) is provided with a hole, the mounting substrate (2) is connected with the microwave reversing elbow (1) through a screw, and a static sealing O-shaped ring (4) is arranged between the mounting substrate (2) and the microwave reversing elbow (1) to realize vacuum sealing;
the polarizer rotating mechanism comprises a supporting bearing (6), a bearing seat (7) and a rotating shaft (8); bearing frame (7) are the notch cuttype drum structure, and rotation axis (8) pass bearing frame (7) to set up support bearing (6) between rotation axis (8) and bearing frame (7) upper segment, set up multistage dynamic seal O type circle (5) between rotation axis (8) hypomere and bearing frame (7), bearing frame (7) lower extreme is fixed at mounting substrate (2).
2. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the microwave reversing elbow (1) is an integrated reversing elbow; the inner wall of the microwave reversing elbow (1) is a smooth curved surface.
3. The high power electron cyclotron resonance heating system fast controllable polarizer according to claim 1 or 2,
and the microwave reversing elbow (1) is made of hard aluminum material.
4. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the microwave reversing elbow (1) is in butt joint with the electronic cyclotron transmission system through a connecting flange, and a static sealing O-shaped ring (4) is arranged between the microwave reversing elbow and the electronic cyclotron transmission system to achieve vacuum sealing.
5. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the bearing seat (7) is connected with the mounting substrate (2) through screws, and a static sealing O-shaped ring (4) is arranged between the bearing seat (7) and the mounting substrate (2) to realize vacuum sealing.
6. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the rotation driving mechanism comprises a rotating platform (9), a coupler (10), a motor (11), a turbine (13) and a worm (14); the motor (11) drives the worm (14) to rotate through the coupler (10), the worm (14) drives the turbine (13) to rotate, the turbine (13) drives the rotating platform (9) to rotate, the rotating platform (9) drives the rotating shaft (8) to rotate, and the rotating shaft (8) drives the polarizer (3) to rotate.
7. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 6,
the rotary driving mechanism further comprises an emergency manual adjusting device (12) and an emergency manual adjusting device (12) which are arranged on the motor (11), and emergency braking protection of the motor (11) is guaranteed under the conditions of power failure and control failure.
8. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 6,
the rotary platform (9) comprises an upper cover plate and an outer sleeve, the outer sleeve is sleeved outside the bearing seat (7), a non-circular hole is formed in the center of an upper end cover, the upper cover plate covers the outer sleeve, the rotary platform (9) is in clearance fit with the bearing seat (7), and the rotary platform (9) rotates around the bearing seat (7); the upper part of the rotating shaft (8) is matched with a central non-circular hole of an upper cover plate of the rotating platform (9).
9. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the utility model discloses a microwave oven, including mounting substrate (2), rotation axis (8), polarizer (3), installation base plate (2) and microwave reversing elbow (1), the cavity that polarizer (3) were located mounting substrate (2) and microwave reversing elbow (1) and formed, and polarizer (3) mirror surface is towards the microwave entry, and is 45 degrees contained angles with the microwave incident direction, and rotation axis (8) are ladder cylinder structure, and the center trompil that rotation axis (8) lower extreme passed mounting substrate (2) is connected with polarizer (3) back, and the center trompil radius of mounting substrate (2) is less than polarizer (3) radius.
10. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the polarizer (3) is a diffraction grating polarizer and is used for reflecting microwaves and realizing the change of the polarization form of the microwaves when the polarizer (3) rotates.
11. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 10,
the polarizer (3) is a vector diffraction grating polarizer, and the mirror surface of the polarizer (3) is processed with a uniform symmetrical groove structure.
12. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 11,
the uniform symmetrical groove structure processed by the mirror surface of the polarizer (3) is a rectangular groove structure or a non-rectangular groove structure.
13. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 11 or 12,
the uniform symmetrical flute structure processed by the mirror surface of the polarizer (3) is a continuous sine corrugated structure.
14. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 13,
the central position of the continuous sine wave structure of the polarized mirror (3) is a wave trough.
15. The high power electron cyclotron resonance heating system fast controllable polarizer of any one of claims 1, 10, 11, 12 or 14,
the polarizer (3) is made of an oxygen-free copper material.
16. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 13,
the amplitude and the period of the sine wave of the continuous sine wave corrugated structure on the surface of the polarizer (3) are determined according to the wavelength of the microwave, the incident angle of the microwave, the reflection angle of the microwave, the rotation angle alpha of the elliptic main shaft of the polarizer (3) and the ellipticity beta angle of the polarizer (3).
17. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 14,
the surface of the polarizer (3) is a continuous sine corrugated structure f (x) ═ dcos (2 pi x/p)/2, wherein d represents the flute depth, unit and mm; p represents flute period, unit, mm; x represents the transverse cross-sectional direction of the flutes.
18. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 17,
when the groove depth of the mirror surface of the polarizer (3) is different multiples of the microwave wavelength, the elliptical polarization parameter and the linear polarization parameter of the microwave can be respectively changed.
19. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 17,
the flute depth of the mirror surface of the polarizer (3) is selected to be 0.35 times of the wavelength of the microwave.
20. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 18,
the flute depth of the mirror surface of the polarizer (3) for changing the microwave elliptical polarization parameter is 0.3 times of the microwave wavelength, and the flute depth of the mirror surface of the polarizer (3) for changing the microwave linear polarization parameter is 0.434 times of the microwave wavelength.
21. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
the polarizer also comprises a rotation control system, wherein the rotation control system comprises a controller and a logic controller, and the controller accurately acquires the rotation direction information of the polarizer in real time; the logic controller carries out remote parameter setting and rotation control on the motor (11) and communicates with the electronic rotary main control system through the Ethernet.
22. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 21,
the rotation control system is used for remote parameter setting and rotation control of the motor (11); the control mode of the motor (11) is a pulse control mode.
23. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 6,
the inner diameter of an output hole of the turbine (13) is 60 mm.
24. The high power electron cyclotron resonance heating system fast controllable polarizer of any one of claims 1, 4 or 5,
the static sealing O-shaped ring (4) is of a metal sealing ring structure.
25. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 24,
the static sealing O-shaped ring (4) is a Helicoflex type metal sealing ring.
26. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 1,
a multistage dynamic sealing O-shaped ring (5) arranged between the rotating shaft (8) and the bearing seat (7) is a Wilson dynamic sealing structure; lubricating grease with high viscosity and small volatility is filled between the multi-stage dynamic sealing O-shaped rings (5).
27. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 26,
the number of stages of the multi-stage dynamic sealing O-shaped rings (5) arranged between the rotating shaft (8) and the bearing seat (7) is 3 or more than 3.
28. The high power electron cyclotron resonance heating system fast controllable polarizer of claim 6,
the resolution of the rotary platform (9) is less than 0.1 degrees, and the repeated positioning precision is less than 0.01 degrees.
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| CN109799445B (en) * | 2017-11-17 | 2024-03-19 | 核工业西南物理研究院 | Millimeter wave band microwave polarization parameter measurement system |
| CN108376815B (en) * | 2018-02-06 | 2019-08-13 | 华中科技大学 | A kind of any polar system of high power millimeter wave based on bipolar pulse former |
| CN111258338A (en) * | 2018-12-03 | 2020-06-09 | 核工业西南物理研究院 | Real-time linkage control system for polarizer and antenna |
| CN109617630B (en) * | 2018-12-06 | 2020-05-19 | 华中科技大学 | System for automatically measuring polarization parameters of reflected waves of polarizer |
| CN112637986B (en) * | 2019-10-09 | 2023-01-24 | 新奥科技发展有限公司 | Waveguide telescopic deflection adjusting device |
| CN112752364B (en) * | 2019-10-31 | 2022-11-04 | 新奥科技发展有限公司 | Polarizer |
| CN112752363B (en) * | 2019-10-31 | 2022-11-04 | 新奥科技发展有限公司 | Polarizer |
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