CN113612006A - Distributed T-shaped traveling wave ion cyclotron antenna structure - Google Patents

Distributed T-shaped traveling wave ion cyclotron antenna structure Download PDF

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Publication number
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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CN
China
Prior art keywords
current strip
current
strip
antenna
ion cyclotron
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Pending
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CN202110857115.2A
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Chinese (zh)
Inventor
杨桦
秦成明
张新军
袁帅
王永胜
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Hefei Institutes of Physical Science of CAS
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Hefei Institutes of Physical Science of CAS
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Priority to CN202110857115.2A priority Critical patent/CN113612006A/en
Publication of CN113612006A publication Critical patent/CN113612006A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/002Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/48Earthing means; Earth screens; Counterpoises
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/52Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05HPLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00Generating plasma; Handling plasma
    • H05H1/02Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05HPLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00Generating plasma; Handling plasma
    • H05H1/02Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma
    • H05H1/16Arrangements 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

Distributed T-shaped traveling wave ion cyclotron antenna structure
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.
CN202110857115.2A 2021-07-28 2021-07-28 Distributed T-shaped traveling wave ion cyclotron antenna structure Pending CN113612006A (en)

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Citations (10)

* Cited by examiner, † Cited by third party
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
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

Patent Citations (10)

* Cited by examiner, † Cited by third party
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
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
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
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
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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JAYESH GANJI.ETC: "The Impact of the Resonator Shape of a Combline Travelling Wave Antenna on its RF and Thermal Performance", 2020 IEEE ASIA-PACIFIC MICROWAVE CONFERENCE *
曹振平;: "ICRF传输系统的优化数值分析", 核电子学与探测技术 *
杨庆喜;宋云涛;武松涛;陈永华;: "EAST离子回旋加热天线传输线结构设计", 核聚变与等离子体物理 *

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