CN113612012A - Movable grid type surface wave ion cyclotron antenna structure - Google Patents
Movable grid type surface wave ion cyclotron antenna structure Download PDFInfo
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- CN113612012A CN113612012A CN202110859076.XA CN202110859076A CN113612012A CN 113612012 A CN113612012 A CN 113612012A CN 202110859076 A CN202110859076 A CN 202110859076A CN 113612012 A CN113612012 A CN 113612012A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
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- Spectroscopy & Molecular Physics (AREA)
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- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a movable grid type surface wave ion cyclotron antenna structure which comprises a current strip, a Faraday shield, a back plate, a grid plate, ceramics and a movable connecting rod. The current strip is arranged between the Faraday shield and the back plate, one end of the current strip is connected with the inner conductor of the radio frequency transmission line, and the other end of the current strip is fixed on the box body; the grid plate and the ceramic are assembled together through a movable connecting rod and are suspended and fixed between the current strip and the back plate; the device is characterized in that a metal grid plate connected with ceramics adopts a grid type structure and is fixed with a movable connecting rod, and water cooling loops are designed in the grid plate and the movable connecting rod; the resonance frequency of the antenna is not changed by the change of the plasma state, the load impedance of the antenna is changed, the reflection coefficient of the antenna is influenced to a certain extent, but the resonance frequency of the antenna is not changed, so that the stability of the radiation performance of the antenna is ensured, and the high-power steady-state operation of the antenna is reliably ensured.
Description
Technical Field
The invention relates to the technical field of magnetic confinement ion cyclotron wave heating plasma antennas, in particular to a movable grid type surface wave ion cyclotron antenna structure which is used for heating plasma in tokamak and has the working frequency range of 30-100 MHz.
Background
The realization of magnetic confinement fusion requires that ions with high enough temperature are effectively collided, and ion cyclotron resonance heating is one of the important methods for ion heating on the existing magnetic confinement device and is widely applied to various magnetic confinement plasma devices. The ion cyclotron frequency is 30-100MHz, the wavelength in vacuum is about 3-10 m, and the ion cyclotron antenna length is far lower than 1/4 wavelength, the input impedance of the antenna is usually 1-10 ohm, the characteristic impedance of the transmission line is 30 or 50 ohm, and the mismatch of the impedance causes the power transmission efficiency to be low. Scattering parameter S of conventional ion cyclotron antenna11During the megawatt high-power operation period with more than-0.2 dB, the reflected power forms high standing waves on the transmission line, the standing wave voltage of the transmission line is increased, and the phenomena of breakdown and ignition are easily caused. In order to effectively improve the radiation performance of the antenna, the invention designs an ion cyclotron antenna with low reflection power by utilizing the principle of high surface impedance wave: a dielectric (such as ceramic) surface with high dielectric constant is perforated for connecting metal and grounding parts on the ceramic surface, and the resonant frequency of the antenna is controlled by adjusting the positions of the metal structure and the grounding via hole, so that the resonant ion cyclotron antenna meeting a specific frequency is designed. In the related patents (CN108601190A, CN110278649A) and articles of the prior application, the structure is only faraday shield, strip and box, and there is no movable ceramic and metal grid structure in the ion cyclotron antenna structure.
Disclosure of Invention
In order to solve the problems of low radiation efficiency and high reflection coefficient of the traditional ion cyclotron short antenna, the invention designs a movable ceramic structure based on a surface wave structure to realize the resonance of the antenna in the working frequency range.
The invention aims to provide a movable grid type surface wave ion cyclotron antenna structure, which is an ion cyclotron antenna with high surface impedance, wherein a movable grid type metal structure and a ceramic structure are designed between an antenna current strip and an antenna box body, a hole is formed in ceramic, the metal structure penetrates through a through hole in the ceramic to be connected with a grounding structure, and under the condition of not changing the length of the ion cyclotron antenna, the capacitance and the inductance of the antenna are changed by adjusting the positions of the ceramic and a grid plate relative to the current strip, so that the ion cyclotron antenna and plasma frequency resonance are realized, the radiation power of the antenna is effectively improved, and the scattering parameter S of the antenna is obtained11And the reflection coefficient is effectively reduced below-10 dB, so that high-temperature plasma is obtained, and the effective heating of the Tokamak plasma is ensured.
The technical scheme adopted by the invention is as follows:
a movable grid type surface wave ion cyclotron antenna structure comprises a Faraday shield 2, a box body 5, a current strip 1, a grid plate 3, ceramics 4, a movable connecting rod 7 and a metal sliding sheet base 8. The Faraday shielding box body 5 is fixed on the back plate; the current strip 1 is arranged between the Faraday shielding box body 5 and the back plate, one end of the current strip is connected with the radio frequency coaxial line 10, and the other end of the current strip is fixed on the Faraday shielding box body 5. A movable ceramic 4 is installed between the antenna current strip 1 and the box body 5, a movable connecting rod 7 passes through the center of the ceramic 4, and the ceramic 4 is attached to the movable connecting rod 7.
Furthermore, the antenna structure further comprises a back plate. The grid plate 3 is assembled with the ceramic 4 blocks by movable connecting rods 7 and fixed in suspension between the current strips 1 and the back plate.
Further, the ceramic 4 is made of 99 porcelain, holes are formed in specific positions, the movable connecting rod 7 passes through the holes from the center, and the ceramic 4 is tightly attached to the movable connecting rod 7.
Furthermore, the grid metal plate connected with the ceramic 4 blocks adopts a grid type structure, the grid plate 3 and the movable connecting rod 7 are fixed together to form a resonance loop with the antenna current strip, and a water cooling loop is designed inside the grid plate 3 and the movable connecting rod 7.
Further, the movable ceramic 4 moves through a movable connecting rod 7, and the movable connecting rod 7 is connected with the box body through a fixed shaft sleeve 6 with a metal sliding sheet 9.
Furthermore, the ceramic 4 block, the grid plate 3 and the movable connecting rod 7 are fixed on the back plate together through the fixed shaft sleeve 6, the grid plate 3 and the ceramic 4 are arranged between the current strip and the back plate in a suspended mode and keep a distance from the box body 5 and the current strip respectively, and the movable connecting rod is connected with the box body 5 through a metal slide sheet 9 on a metal slide sheet base 8. Ensuring good electrical contact between the movable connecting rod 7 and the tank 5.
Further, the ceramic 4 is 99 porcelain.
The invention has the advantages that:
1. the invention enables the ion cyclotron frequency of plasma and the frequency of an antenna structure to resonate under the condition of not changing the length of the ion cyclotron antenna (the length of the antenna is limited by the actual size of a Tokamak window), thereby realizing the high-efficiency radiation of the antenna;
2. the ion cyclotron antenna has a low reflection coefficient (the theoretical value is less than-10 dB), and the power reflection coefficient is greatly reduced compared with the power reflection coefficient (more than-0.2 dB) of the current ion cyclotron antenna running on a Tokamak, so that the power capacity of a system is effectively improved;
3. the radiation performance of the antenna is less affected by load, namely, the radiation performance of the antenna is not changed by the change of the plasma state, so that the practical range of the ion cyclotron antenna is ensured. Both theory and simulation prove that the load impedance of the antenna changes, and although the reflection coefficient of the antenna has certain influence, the resonance frequency does not change, so that the radiation efficiency of the antenna can reach the optimal effect, and the effective transmission of high power is realized.
Drawings
FIG. 1 is a three-dimensional side view of a structure of the present invention;
FIG. 2 is a view showing the structure of a grid metal plate according to the present invention;
FIG. 3 is a view of the fixed bushing structure of the movable connecting rod contacting the housing of the present invention;
FIG. 4 is a schematic diagram of the structure of the present invention;
fig. 5 is a comparison of scattering parameters of the antenna of the present invention and a conventional antenna.
Reference numerals:
1: a current strip; 2: a Faraday shield; 3: a grid plate; 4: a ceramic; 5: a box body; 6: fixing the shaft sleeve; 7: a movable connecting rod; 8: a metal slip sheet base; 9: a metal slip sheet; 10: a coaxial line.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a three-dimensional side view of the structure of the present invention. Fig. 3 is a view showing a fixed bushing structure of the movable link 7 contacting the casing 5 according to the present invention. Referring to fig. 1 and 3, a movable grid type surface wave ion cyclotron antenna structure comprises a faraday shield 2, a box 5, a current strip 1, a grid plate 3, ceramics 4, a movable connecting rod 7 and a metal slide sheet base 8. The Faraday shielding box body 5 is fixed on the back plate; the current strip 1 is mounted between the faraday shield box 5 and the back plate.
One end of the current strip 1 is connected with the box body 5, the other end of the current strip is connected with the radio frequency coaxial line 10, the grid plate 3 and the ceramic 4 are located between the current strip 1 and the back plate, and the grid plate 3 and the ceramic 4 are connected with the back plate of the box body through the movable connecting rod 7.
Install portable pottery 4 between antenna current strip 1 and box 5, the pottery adopt 99 porcelains, but movable connecting rod 7 passes through from 4 central points on pottery, pottery and movable connecting rod closely laminate.
The movable ceramic 4 is moved by a movable connecting rod. The ceramic 4, the grid plate 3 and the movable connecting rod 7 are fixed on the back plate together through the fixed shaft sleeves, the grid plate 3 and the ceramic 4 are arranged between the current strip 1 and the back plate in a suspended mode and respectively keep a certain distance from the box body 5 and the current strip 1, the movable connecting rod 7 is connected with the box body 5 through a metal sliding sheet (9) on a metal sliding sheet base (8), and good electric contact between the movable connecting rod 7 and the box body 5 is guaranteed.
Fig. 2 is a structural view of a grid metal plate of the present invention. Referring to fig. 1 and 2, the grid plate 3 includes a plurality of parallel horizontal grid plates and a vertical grid plate, which are crossed, and grooves for the horizontal grid plates to be inserted are formed on the vertical grid plate. See attached figures 2 and 3, the grid plate 3 and the ceramic 4 are connected with the movable connecting rod 7, the other end of the movable connecting rod 7 passes through the box body 5 and is in contact with the box body 5 through the metal slip sheet base 8, and the metal slip sheet 9 is installed between the metal slip sheet base 8 and the box body 5, so that the effect of ensuring good electric contact is achieved. The metal slip sheet base 8 is fixed on the box body 5 through the fixing shaft sleeve 6, and plays a role in mechanical fixing.
The grid metal plate connected with the ceramic 4 is of a grid structure, the grid plate 3 and the movable connecting rod 7 are fixed together to form a resonance loop with the antenna current strip 1, and a water cooling loop is designed inside the grid plate 3 and the movable connecting rod 7.
Fig. 4 is a schematic diagram of the structure of the present invention. Referring to the attached drawings 1 and 4, radio frequency waves excite an electromagnetic field between a current strip 1 and a box body 5, a Faraday shield 2, a grid plate 3, ceramics 4 and a movable connecting rod 7 play a role in adjusting capacitance and resistance of a circuit, and the movable connecting rod 7 is adjusted to enable an antenna to resonate at a working frequency so as to realize high-efficiency radiation.
Fig. 5 is a comparison of scattering parameters of the antenna of the present invention and a conventional antenna. Referring to fig. 5, the antenna of the present invention has a lower power reflection coefficient than the conventional antenna, and the radiation performance is greatly improved.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art. The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and the preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is to be covered by the protection scope defined by the claims.
Claims (5)
1. A movable grid type surface wave ion cyclotron antenna structure is characterized in that: the device comprises a Faraday shield (2), a box body (5), a current strip (1), a grid plate (3), ceramics (4), a movable connecting rod (7) and a metal slip sheet base (8); the Faraday shielding box body (5) is fixed on the back plate; the current strip (1) is arranged between the Faraday shielding box body (5) and the back plate, one end of the current strip (1) is connected with the radio frequency coaxial line (10), and the other end of the current strip is fixed on the Faraday shielding box body (5); install portable pottery (4) between antenna current strip (1) and box (5), but movable connecting rod (7) are followed pottery (4) central point and are put through, and pottery (4) and movable connecting rod (7) laminating.
2. The movable gridlike surface wave ion cyclotron antenna structure of claim 1, wherein: the grid metal plate connected with the ceramic (4) adopts a grid type structure, the grid plate (3) and the movable connecting rod (7) are fixed together to form a resonance circuit with the antenna current strip (1), and a water cooling circuit is designed inside the grid plate (3) and the movable connecting rod (7).
3. The movable gridlike surface wave ion cyclotron antenna structure of claim 1, wherein: the movable ceramic (4) moves through a movable connecting rod (7), and the movable connecting rod (7) is connected with the box body through a fixed shaft sleeve (6) with a metal sliding sheet (9).
4. The movable gridlike surface wave ion cyclotron antenna structure of claim 1, wherein: the grid plate and movable connecting rod combined type solar photovoltaic power generation system is characterized in that the ceramic (4), the grid plate (3) and the movable connecting rod (7) are fixed on the back plate together through the fixed shaft sleeve (6), the grid plate (3) and the ceramic (4) are arranged between the current strip (1) and the back plate in a suspended mode and are respectively kept away from the box body (5) and the current strip (1), and the movable connecting rod (7) is connected with the box body through a metal sliding piece (9) on a metal sliding piece base (8).
5. The movable gridlike surface wave ion cyclotron antenna structure of claim 1, wherein: the ceramic (4) is 99 porcelain.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110859076.XA CN113612012B (en) | 2021-07-28 | 2021-07-28 | Movable grid type surface wave ion cyclotron antenna structure |
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| CN202110859076.XA CN113612012B (en) | 2021-07-28 | 2021-07-28 | Movable grid type surface wave ion cyclotron antenna structure |
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| CN113612012A true CN113612012A (en) | 2021-11-05 |
| CN113612012B CN113612012B (en) | 2023-09-29 |
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