CN203660060U - High-power grating polarizer - Google Patents
High-power grating polarizer Download PDFInfo
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- CN203660060U CN203660060U CN201320838054.6U CN201320838054U CN203660060U CN 203660060 U CN203660060 U CN 203660060U CN 201320838054 U CN201320838054 U CN 201320838054U CN 203660060 U CN203660060 U CN 203660060U
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Abstract
The utility model belongs to a megawatt grade high-power grating polarizer in the technical field of high power radio frequency heating of nuclear fusion plasma. The high-power grating polarizer comprises a polarizer shell, a right angle ripple waveguide cavity arranged in the polarizer shell, a reflecting plate and a rotating head thereof, and a fixing plate, and a reflecting surface of the reflecting plate is a cosine or sine wave arc curved surface. According to the high-power grating polarizer, the cosine or sine wave arc curved surface serves as the reflecting surface of the polarizer so that the polarization mode of microwave is changed by taking advantage of the reflected phase difference between the top and the bottom of the arc curved surface from different wave field components, arbitrary polarization of the microwave mode is realized via the rotation of the reflecting surface, and different polarization requirements of various heating and current driving of plasma for waves are satisfied. The high-power grating polarizer is advantaged by high power capacity, flexible and convenient usage, and high reliability, the field intensity of the surface area of each groove of the reflecting surface is significantly reduced, and the generation of arc breakdown can be effectively prevented. The polarizer can be widely applicable to ECRH systems with a frequency of 140 GHz in order to adjust the polarization mode of the microwave.
Description
Technical field
The utility model belongs to nuclear fusion plasma high-power RF heating technique research and experiment field, particularly bronze mirror reflecting surface is carved with remaining (just) string waveform groove, for changing the MW class high power light grid polarizer of microwave polarization mode in 140GHz ECRH (Electron Cyclotron Resonance Heating) system communications line.
Background technology
In ECRH system, the polarization characteristic of incident electromagnetic wave is a very important parameter.The electron cyclotron wave of gyrotron output is through in transmission line and horizontal transmit antenna feed-in plasma.In order to carry out under different discharge parameters, plasma heating or In Lhcd, require microwave with certain angle of inclination injected plasma conventionally.After the electron cyclotron wave of free space transmission enters plasma under certain angle, can be coupled to O mould or X mould to carry out O1 or the heating of X2 mould, the ratio of these two kinds of patterns depends on polarised direction and the incident angle of incident wave.Therefore,, in order to carry out O mould and the experiment of X mould plasma heating, need to produce required polarization characteristic by rotary polarization device optical grating speculum.
Polarizer is the microwave device for changing microwave polarization mode.Utilize two reflectings surface of the different slots line degree of depth to change microwave polarization parameter, i.e. polarization ellipse anglec of rotation α and polarization ellipse rate β, to realize any change of polarization.Development polarizer is exactly to select best groove line (shape) structure and the degree of depth and the cycle of groove, obtains polarization parameter α and the β of reflected wave under polaroid polarizer different rotary angle according to these parameters by numerical computations.In addition, also should reduce parasitic mode as far as possible, guarantee the safe operation of polarizer under high power long pulse.
At " Application of a grating polarizer to the106.4GHz ECH system on Heliotron-E (being applied to the grating polarizer of ECH system on spiral organ device) " (Nagasaki of Japanese University of Kyoto, the people such as Isayama are published in " Review of Scientific Instruments " Vol.66 in nineteen ninety-five, PP.3432-3437) in a literary composition, disclosing a kind of reflector (plate) is that its reflecting surface of copper material is the polarizer of rectangular channel line face, this polarizer comprises circular shell, be located at the waveguide cavity in housing and be positioned at waveguide cavity and be carved with the reflector of rectangular channel reflection (mirror) face (the rectangular channel cycle is 0.35 λ, groove width is 0.25 λ, groove depth is 0.32 λ, λ=2.82 ㎜), and be located at the swivel head with handle that reflector rear portion is connected with reflector, when this polarizer uses, be located at the quarter bend place of corrugated waveguide transmission line and be communicated with and fix with corrugated waveguide chamber, the reflecting surface that is carved with rectangular channel is positioned at the external corners place of the waveguide cavity of corrugated waveguide.This polarizer is intensive owing to locating power line in each rectangular channel two lateral edges (line), potential gradient is large, near it, field intensity reaches 1.24MV/cm left and right (approaching the 1.3MV/cm of vacuum breakdown field intensity), cause portion gas breakdown and occur point discharge, easily cause polarizer generation arc through phenomenon, affect the safe operation of system.
Summary of the invention
The purpose of this utility model is for the defect existing in background technology, improve a kind of high power light grid polarizer of design, the reflecting surface of this polarizer on reflecting plate adopts cosine or positive wave arc-shaped curved surface, change microwave polarization mode to reach the potential gradient in the each grooved area of effective reduction reflecting surface, avoid the generation of arc through phenomenon, the objects such as the security performance of raising operation.
Solution of the present utility model is still to adopt the reflecting plate that copper or copper alloy are polarizer, and change its reflecting surface into cosine or positive wave arc-shaped curved surface by the rectangle groove face of background technology, thereby reduce the electric field strength in the each arc groove surf zone of reflecting surface, avoid the generation of arc through phenomenon; The utility model realizes its goal of the invention with this.Thereby the utility model high power light grid polarizer comprises polarizer housing and establishes rectangular wave ripple guide cavity in the inner, reflecting plate and swivel head thereof, fixed head, key is that the reflecting surface on reflecting plate is cosine or sinusoidal wave arc-shaped curved surface; Reflecting plate is by bolt and the detachable one that is tightened to of swivel head, and by fixed head, reflecting plate is fixed on to the external corners place in rectangular wave ripple guide cavity turnably.
Reflecting surface on described reflecting plate is cosine or sinusoidal wave arc-shaped curved surface, in the time adopting cosine wave arc-shaped curved surface, its arc-shaped curved surface function is f (x)=d2[1+cos (2 π x/p)], in formula: p is that cycle, d are the degree of depth of the each groove of arc-shaped curved surface.Described reflecting plate is fixed on to the external corners place in rectangular wave ripple guide cavity turnably, reflecting plate is 45° angle and vertical with two axial lines formed plane with rectangular wave ripple guide cavity into and out of the axis of port respectively.Described rectangular wave corrugated waveguide cavity cross-sectional area is 1:1.26-1.30 with the ratio of the area of reflecting plate.
The utility model is due to the reflecting surface that adopts cosine or sinusoidal wave arc-shaped curved surface as polarizer, thereby can make full use of different wave field components and change at the phase difference of the top and bottom reflection of arc-shaped curved surface the polarization mode of microwave, and realize any polarization of microwave mode by rotary reflection surface, meet the difference polarization requirement to ripple of the various heating of plasma and current drives.In addition, the utility model adopts the direction of propagation of the convertible wave beam of elbow structure, meets the practical layout arrangement of transmission line and the functional requirement that will reach, and corrugated waveguide can low-loss transmission HE
11mould, transmission capacity is large, and can make HE
11the high efficiency mutual conversion of mould and Gaussian mode; The utility model can be down to 0.95MV/cm by the electric field strength in each reflecting surface arc groove surf zone and far below the 1.3MV/cm of vacuum breakdown field intensity.Thereby, the utlity model has that power capacity is large, flexible and convenient to use, reliability is high, greatly reduce the field intensity of the each recess surface area of reflecting surface, thereby can effectively avoid the features such as the generation of arc through.The utility model can be widely used in ECRH system that frequency is 140GHz to regulate the polarization mode of microwave.
Brief description of the drawings
Fig. 1 is the utility model high power light grid polarizer structural representations (cutaway view).
Fig. 2 is the polarization ellipse of the utility model reflected wave and the position view of α, β; Wherein: α is that polarization ellipse Spindle rotation angle degree, β are the angle between polarization ellipse major axis and minor axis diagonal,, reflected wave is pure linear polarization when the β=0 °, and when β=45 °, reflected wave is pure circular polarization.
Fig. 3 (A) is the polarization parameter curve (coordinate diagram) of the embodiment of the present invention 1; Fig. 3 (B) is the polarization parameter curve (coordinate diagram) of the embodiment of the present invention 2.
In figure: 1. corrugated waveguide transmission line, 2. housing, 3. swivel head, 3-1. turning handle, 4. reflecting plate, 4-1.(cosine or positive wave arc) reflecting surface, 5. bolt, 6. ball, 7. fixed head.
Embodiment
Embodiment mono-
The present embodiment taking to internal diameter ECRH (Electron Cyclotron Resonance Heating) the system corrugated waveguide transmission line as φ 63.5mm, material as 6061-T6 aluminium alloy change microwave polarization mode with photogate device as example: wherein, corrugated waveguide 1 internal diameter φ 63.5mm, each ripple groove depth 0.41mm, cycle are 0.66mm, groove width 0.46mm, external diameter φ 76.2mm, and on it, this interior open area of the major axis 84.71mm of quarter bend top otch, minor axis 61.40mm(is 4083.26mm
2, its area is 1.29 times of corrugated waveguide cavity cross-sectional area), otch plane is all 45 ° and vertical with two axial lines formed plane with elbow both sides corrugated waveguide into and out of the axis of port; Reflecting plate 4 is oval, its long and short axle is respectively 84.71mm, 61.40mm, thickness is 11.48mm, reflecting surface 4-1 the present embodiment on it adopts cosine waveform curved surface, arc-shaped curved surface function is f (x)=d2[1+cos (2 π x/p)], in formula: depth d=0.34 λ of period p=0.48 λ, each groove, λ is wavelength.Fixed head 7 by bolted on housing 2, swivel head 3 by bolt 5 and reflecting plate 4 be detachablely fastenedly connected into an assembly, this assembly the present embodiment is connected with fixed head 7 turnably by the rolling ring being divided on swivel head 3 and reflecting plate 4; Originally be implemented on swivel head 3 and be also provided with turning handle 3-1 to facilitate adjusting rotational angle.
Fig. 3 (A) is the present embodiment polarizer emulation experiment gained polarization parameter curvilinear coordinate figure, and wherein " N " shape curve is that the polarization ellipse anglec of rotation (α) curve, scope are from-90 °-90 °; Being with leg-of-mutton curve is ellipticity (β) curve, and scope is from-38 °-38 °; Therefore, reflected wave can be considered circular polarization in the time that the reflecting surface anglec of rotation is 60 ° or 120 °.
Embodiment bis-
The degree of depth of what the present embodiment was different from embodiment mono-is each groove is d=0.45 λ, and remaining is all identical with embodiment mono-.
Fig. 3 (B) is the present embodiment polarizer emulation experiment gained polarization parameter curvilinear coordinate figure, and wherein " N " shape curve is that the polarization ellipse anglec of rotation (α) curve, scope are from-90 °-90 °; Curve with triangular waveform is polarization ellipse rate (β) curve, and scope is from-12.8 °-12.8 °; Therefore, reflected wave can be similar to and be considered as linear polarization in 0-180 ° of the reflecting surface anglec of rotation, because ellipticity β is less than 13 °, this also just means that the energy component in ellipse short shaft direction is less than 5%.
Claims (4)
1. a high power light grid polarizer, comprises polarizer housing and establishes rectangular wave ripple guide cavity in the inner, reflecting plate and swivel head thereof, and fixed head, is characterized in that the reflecting surface on reflecting plate is cosine or sinusoidal wave arc-shaped curved surface; Reflecting plate is by bolt and the detachable one that is tightened to of swivel head, and by fixed head, reflecting plate is fixed on to the external corners place in rectangular wave ripple guide cavity turnably.
2. by high power light grid polarizer described in claim 1, it is characterized in that the reflecting surface on described reflecting plate is cosine or sinusoidal wave arc-shaped curved surface, in the time adopting cosine wave arc-shaped curved surface, its arc-shaped curved surface function is f (x)=d2[1+cos (2 π x/p)], in formula: p is that cycle, d are the degree of depth of the each groove of arc-shaped curved surface.
3. by high power light grid polarizer described in claim 1, it is characterized in that described reflecting plate being fixed on to the external corners place in rectangular wave ripple guide cavity turnably, reflecting plate is 45° angle and vertical with two axial lines formed plane with rectangular wave ripple guide cavity into and out of the axis of port respectively.
4. by high power light grid polarizer described in claim 1 or 3, it is characterized in that rectangular wave corrugated waveguide cavity cross-sectional area and the ratio of the area of reflecting plate are 1:1.26-1.30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320838054.6U CN203660060U (en) | 2013-12-18 | 2013-12-18 | High-power grating polarizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320838054.6U CN203660060U (en) | 2013-12-18 | 2013-12-18 | High-power grating polarizer |
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| CN203660060U true CN203660060U (en) | 2014-06-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105789909A (en) * | 2016-03-31 | 2016-07-20 | 深圳超级数据链技术有限公司 | Polarizer and resonant cavity |
| CN106935942A (en) * | 2015-12-30 | 2017-07-07 | 核工业西南物理研究院 | A kind of quick controllable polarizer of great-power electronic cyclotron resonance heating system |
| CN108376815A (en) * | 2018-02-06 | 2018-08-07 | 华中科技大学 | A kind of arbitrary polar system of high power millimeter wave based on bipolar pulse former |
| CN109980358A (en) * | 2017-12-28 | 2019-07-05 | 核工业西南物理研究院 | A kind of design method of double frequency polarization grating |
| CN112752364A (en) * | 2019-10-31 | 2021-05-04 | 新奥科技发展有限公司 | Polarizer |
-
2013
- 2013-12-18 CN CN201320838054.6U patent/CN203660060U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106935942A (en) * | 2015-12-30 | 2017-07-07 | 核工业西南物理研究院 | A kind of quick controllable polarizer of great-power electronic cyclotron resonance heating system |
| CN106935942B (en) * | 2015-12-30 | 2022-03-18 | 核工业西南物理研究院 | Quick controllable polarizer of high-power electron cyclotron resonance heating system |
| CN105789909A (en) * | 2016-03-31 | 2016-07-20 | 深圳超级数据链技术有限公司 | Polarizer and resonant cavity |
| CN105789909B (en) * | 2016-03-31 | 2018-12-25 | 深圳超级数据链技术有限公司 | A kind of polarizer and resonant cavity |
| CN109980358A (en) * | 2017-12-28 | 2019-07-05 | 核工业西南物理研究院 | A kind of design method of double frequency polarization grating |
| CN109980358B (en) * | 2017-12-28 | 2021-07-20 | 核工业西南物理研究院 | Design method of dual-frequency polarization grating |
| CN108376815A (en) * | 2018-02-06 | 2018-08-07 | 华中科技大学 | A kind of arbitrary polar system of high power millimeter wave based on bipolar pulse former |
| 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 |
| CN112752364A (en) * | 2019-10-31 | 2021-05-04 | 新奥科技发展有限公司 | Polarizer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20161218 |