CN113612006A - Distributed T-shaped traveling wave ion cyclotron antenna structure - Google Patents
Distributed T-shaped traveling wave ion cyclotron antenna structure Download PDFInfo
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- CN113612006A CN113612006A CN202110857115.2A CN202110857115A CN113612006A CN 113612006 A CN113612006 A CN 113612006A CN 202110857115 A CN202110857115 A CN 202110857115A CN 113612006 A CN113612006 A CN 113612006A
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- ion cyclotron
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- 239000004020 conductor Substances 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 10
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 description 24
- 230000005855 radiation Effects 0.000 description 8
- NMFHJNAPXOMSRX-PUPDPRJKSA-N [(1r)-3-(3,4-dimethoxyphenyl)-1-[3-(2-morpholin-4-ylethoxy)phenyl]propyl] (2s)-1-[(2s)-2-(3,4,5-trimethoxyphenyl)butanoyl]piperidine-2-carboxylate Chemical compound C([C@@H](OC(=O)[C@@H]1CCCCN1C(=O)[C@@H](CC)C=1C=C(OC)C(OC)=C(OC)C=1)C=1C=C(OCCN2CCOCC2)C=CC=1)CC1=CC=C(OC)C(OC)=C1 NMFHJNAPXOMSRX-PUPDPRJKSA-N 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 210000002381 plasma Anatomy 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- 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
- H05H1/02—Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma
-
- 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
- H05H1/02—Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma
- H05H1/16—Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma using externally-applied electric and magnetic fields
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
The invention discloses a distributed T-shaped traveling wave ion cyclotron antenna structure, which comprises a circle of distributed ion cyclotron antennas surrounding the inner wall of a Tokamak, wherein each antenna is provided with eight parallel current strips, the current strips are of a T-shaped structure, a Faraday shield, a box body, a coaxial line inner conductor, a coaxial line outer conductor, a capacitor and a grounding strip. The invention utilizes the characteristics of low voltage and low reflection power coefficient of the traveling wave antenna, adjusts the radio frequency resonance frequency on the current strips through the resistance and the capacitance, and the energy is radiated into the plasma in the mutual coupling process between the strips.
Description
Technical Field
The invention relates to the technical field of magnetic confinement ion cyclotron wave heating plasma, in particular to a distributed T-shaped traveling wave ion cyclotron antenna structure which efficiently radiates electromagnetic waves in a traveling wave state, wherein the frequency range is dozens of megahertz.
Background
Under the condition that the resonance frequency of radio frequency waves is close to or is frequency doubled with the resonance frequency of magnetic field confined ions, electromagnetic waves transfer energy to the ions to play a role in heating plasmas, and fusion of high-temperature ions is realized. The radiation of radio frequency wave energy mainly depends on an antenna, because the ion cyclotron wavelength is in a meter magnitude level, meanwhile, a window of a magnetic confinement fusion device is limited by space, the antenna consists of a current strip less than 1 meter, and the electric field distribution of the conventional ion cyclotron antenna is mainly in a standing wave form. In future large-scale magnetic confinement devices, higher requirements are placed on the heating power of the ion cyclotron antenna, for example, the ion cyclotron power of a future magnetic confinement demonstration reactor which is being designed in China needs to reach 30 megawatts, in order to occupy a horizontal window as little as possible, a traveling wave antenna which is distributed on an upper window is a potential design scheme, under limited feed-in and lead-out power ports, the antenna achieves sufficiently high radiation power, in addition, the reflection parameter S11 of the existing ion cyclotron antenna port is above 0.7, if the distributed traveling wave antenna is adopted, the reflection power of the antenna can be greatly reduced, the reflection parameter is below 0.4, and the large-scale magnetic confinement device has great potential benefits for achieving commercial power generation for future fusion.
Disclosure of Invention
In order to solve the problem of low radiation efficiency of a dozen MHz frequency band antenna in the field of magnetic confinement, the invention provides a distributed T-shaped traveling wave ion cyclotron antenna structure based on the property of high radiation efficiency of a traveling wave antenna, and the distributed T-shaped traveling wave ion cyclotron antenna structure has the characteristics of low reflection and high radiation.
In order to realize the purpose of the invention, the technical scheme is as follows: a distributed T-type traveling wave ion cyclotron antenna structure, comprising:
8 round distributed ion cyclotron antennas around the inside wall of the Tokamak, each antenna has eight parallel current strips 2, the current strips are T-shaped, the Faraday shield 1, the box 3, the coaxial line inner conductor 4, the coaxial line outer conductor 5, the capacitor 6 and the grounding strip 7.
Furthermore, each ion cyclotron antenna is fed with power and positioned on a coaxial transmission line of the first current strip 2, power is led out on a coaxial line inner conductor 4 of the eighth current strip, one end of each of the first current strip and the eighth current strip is open, the other end of each of the first current strip and the eighth current strip is grounded, and power is fed in or led out from the middle of each current strip through the coaxial line inner conductor 4.
Furthermore, the middle six current strips 2 are not directly fed into a power end, the middle of each current strip is grounded through a grounding strip 7, two ends of each current strip are T-shaped, two ends of each current strip and a U-shaped capacitor 6 form a circuit, and after power is fed into the corresponding current strip from the first current strip, the power is sequentially transmitted to the eighth current strip from the second current strip through mutual coupling among the current strips. Most of the power is radiated out during propagation and only a small amount of power is returned to the transmission system from the coaxial line of the eighth current strip.
Further, the first current strip feed port reflection parameter S11 is lower than 0.4.
The invention has the advantages that:
1. the distributed T-shaped traveling wave ion cyclotron antenna structure has good radiation performance, the reflection parameter S11 of the feed-in port is lower than 0.4, the maximum voltage of a transmission system can be reduced due to the low reflection coefficient, and the power capacity is increased;
2. the distributed T-shaped traveling wave ion cyclotron antenna structure does not occupy a horizontal Tokamak window, only an antenna transmission line is arranged at the position of the upper window, and the antenna is integrated with the first Tokamak wall.
3. The invention utilizes the characteristics of low voltage and low reflection power coefficient of the traveling wave antenna, designs the resistor and the capacitor on the current strip to adjust the radio frequency resonance frequency, and the energy is radiated in the mutual coupling process between the strips.
Drawings
FIG. 1 is a two-dimensional view of the structure of the present invention in a Tokamak;
FIG. 2 is a first and eighth current strip configuration of the present invention;
FIG. 3 is a middle six current strip configuration of the present invention;
FIG. 4 is a schematic diagram of the principles of the present invention;
FIG. 5 is a diagram illustrating a comparison of scattering parameters of a feed port of an ion cyclotron antenna according to the present invention.
Reference numerals:
1: a Faraday shield; 2: a current strip; 3: a box body; 4: a coaxial line inner conductor; 5: a coaxial line outer conductor; 6: a capacitor; 7: a ground strap; 8: inside wall of tokamak.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, 2 and 3, a distributed T-type traveling wave ion cyclotron antenna structure comprises a circle of distributed ion cyclotron antennas surrounding an inner wall 8 of a tokamak, each antenna has eight parallel current strips 2, the current strips 2 are in a T-shaped structure, a faraday shield 1, a box body 3, a coaxial line inner conductor 4, a coaxial line outer conductor 5, a capacitor 6 and a grounding strip 7. The current strips 2 are located between the faraday shield 1 and the box 3. The coaxial line is directly connected to the current strip 2.
Each ion cyclotron antenna is fed with power and positioned on a coaxial transmission line of a first current strip 2, power is led out on a coaxial line inner conductor 4 of an eighth current strip, one end of each of the first current strip and the eighth current strip is open, the other end of each of the first current strip and the eighth current strip is grounded, and power is fed in or led out through the coaxial line inner conductor 4 in the middle of each current strip.
The middle six current strips 2 are not directly fed into a power end, the middle of each current strip is grounded through a grounding strip 7, two ends of each current strip are T-shaped, and two ends of each current strip and a U-shaped capacitor 6 form a circuit. Referring to fig. 4, the power input by the first current strip 2 oscillates on the circuit formed by the resistor and the capacitor 6, and the energy is transferred to the second current strip through mutual coupling, and so on, until the energy is transmitted to the eighth current strip, and during the energy transmission, the energy is radiated, wherein each current strip has the inherent resistor and the capacitor 6, which together determine the resonant frequency, and when the resonant frequencies of all the strips are close, the effective radiation energy of the antenna can be satisfied.
With the structure, as shown in fig. 5, when the scattering parameter S11 of the power input port of the first current strip of the antenna is compared with S11 of the conventional ion cyclotron antenna, S11 of the conventional antenna is greater than 0.7, and S11 of the distributed T-type traveling wave ion cyclotron antenna is less than 0.4, it can be seen that the radiation performance of the antenna according to the present invention 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 (4)
1. A distributed T-shaped traveling wave ion cyclotron antenna structure is characterized by comprising:
encircle support card mark inner wall (8) round distributed ion cyclotron antenna, every antenna has eight parallel current strip (2), and current strip (2) present T type structure, Faraday shield (1), box (3), coaxial line inner conductor (4), coaxial line outer conductor (5), electric capacity (6) and ground strip (7).
2. The distributed T-type traveling-wave ion cyclotron antenna structure of claim 1, wherein:
the power feeding position of each ion cyclotron antenna is arranged on a coaxial transmission line of a first current strip (2), power is led out on a coaxial line inner conductor (4) of an eighth current strip, one end of each of the first current strip and the eighth current strip is open, the other end of each of the first current strip and the eighth current strip is grounded, and power is fed in or led out from the middle of each current strip through the coaxial line inner conductor (4).
3. The distributed T-type traveling-wave ion cyclotron antenna structure of claim 1, wherein:
the middle six current strips (2) are not directly fed into a power end, the middle of each current strip (2) is grounded through a grounding strip (7), two ends of each current strip are T-shaped, two ends of each current strip (2) and a U-shaped capacitor (6) form a circuit, and power is fed into the circuit from the first current strip (2) and then is transmitted to the eighth current strip (2) from the second current strip (2) in sequence through mutual coupling among the current strips (2).
4. The distributed T-type traveling-wave ion cyclotron antenna structure of claim 1, wherein:
the first current strip (2) feed port reflection parameter S11 is below 0.4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110857115.2A CN113612006A (en) | 2021-07-28 | 2021-07-28 | Distributed T-shaped traveling wave ion cyclotron antenna structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110857115.2A CN113612006A (en) | 2021-07-28 | 2021-07-28 | Distributed T-shaped traveling wave ion cyclotron antenna structure |
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| CN113612006A true CN113612006A (en) | 2021-11-05 |
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| CN202110857115.2A Pending CN113612006A (en) | 2021-07-28 | 2021-07-28 | Distributed T-shaped traveling wave ion cyclotron antenna structure |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4755345A (en) * | 1986-08-01 | 1988-07-05 | The United States Of America As Represented By The United States Department Of Energy | Impedance matched, high-power, rf antenna for ion cyclotron resonance heating of a plasma |
| US5289509A (en) * | 1993-01-19 | 1994-02-22 | General Atomics | Shielded comb-line antenna structure for launching plasma waves |
| US20020080904A1 (en) * | 1995-09-11 | 2002-06-27 | The Regents Of The University Of California | Magnetic and electrostatic confinement of plasma in a field reversed configuration |
| CN102291925A (en) * | 2005-03-07 | 2011-12-21 | 加州大学评议会 | Plasma electric generation system |
| CN102420090A (en) * | 2010-09-28 | 2012-04-18 | 东京毅力科创株式会社 | Plasma processing apparatus and plasma processing method |
| CN102543223A (en) * | 2012-02-15 | 2012-07-04 | 中国科学院等离子体物理研究所 | ICRF (Ion Cyclotron Resonance Frequency) antenna structure with angle-adjustable faraday shield cooling tube |
| CN103943958A (en) * | 2014-04-11 | 2014-07-23 | 中国科学院等离子体物理研究所 | Conjugate antenna structure oriented towards plasma coupling impedance rapid changes |
| WO2014202739A1 (en) * | 2013-06-19 | 2014-12-24 | Universita' Degli Studi Di Torino | Electromagnetic radiating structure to generate a direct current in a magnetically confined plasma in a tokomak thermonuclear fusion reactor by high frequency electromagnetic radiation |
| CN107706524A (en) * | 2017-09-01 | 2018-02-16 | 中国科学院合肥物质科学研究院 | The ion involution of height tolerance plasma variations heats long antenna |
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-
2021
- 2021-07-28 CN CN202110857115.2A patent/CN113612006A/en active Pending
Patent Citations (10)
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|---|---|---|---|---|
| US4755345A (en) * | 1986-08-01 | 1988-07-05 | The United States Of America As Represented By The United States Department Of Energy | Impedance matched, high-power, rf antenna for ion cyclotron resonance heating of a plasma |
| US5289509A (en) * | 1993-01-19 | 1994-02-22 | General Atomics | Shielded comb-line antenna structure for launching plasma waves |
| US20020080904A1 (en) * | 1995-09-11 | 2002-06-27 | The Regents Of The University Of California | Magnetic and electrostatic confinement of plasma in a field reversed configuration |
| CN102291925A (en) * | 2005-03-07 | 2011-12-21 | 加州大学评议会 | Plasma electric generation system |
| CN102420090A (en) * | 2010-09-28 | 2012-04-18 | 东京毅力科创株式会社 | Plasma processing apparatus and plasma processing method |
| CN102543223A (en) * | 2012-02-15 | 2012-07-04 | 中国科学院等离子体物理研究所 | ICRF (Ion Cyclotron Resonance Frequency) antenna structure with angle-adjustable faraday shield cooling tube |
| WO2014202739A1 (en) * | 2013-06-19 | 2014-12-24 | Universita' Degli Studi Di Torino | Electromagnetic radiating structure to generate a direct current in a magnetically confined plasma in a tokomak thermonuclear fusion reactor by high frequency electromagnetic radiation |
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| CN208753531U (en) * | 2018-09-28 | 2019-04-16 | 江阴立马机械科技有限公司 | A kind of ion involution antenna uncoupling device |
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