CN210604793U - Tokamak density fluctuation and electromagnetic field fluctuation correlation measuring device - Google Patents
Tokamak density fluctuation and electromagnetic field fluctuation correlation measuring device Download PDFInfo
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- CN210604793U CN210604793U CN201920992652.6U CN201920992652U CN210604793U CN 210604793 U CN210604793 U CN 210604793U CN 201920992652 U CN201920992652 U CN 201920992652U CN 210604793 U CN210604793 U CN 210604793U
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Abstract
The utility model belongs to nuclear fusion plasma diagnosis field, concretely a tokamak density fluctuation and electromagnetic field fluctuation correlation measuring device. The microwave antenna comprises a transmitting microwave source and a microwave intrinsic source, and comprises a microwave transmitting link connected with the transmitting microwave source, a microwave intrinsic link connected with the microwave intrinsic source, a microwave receiving antenna and an orthogonal mode converter; an angle rotating device is arranged on the microwave receiving antenna. The device can realize the strict simultaneous measurement of plasma density fluctuation and magnetic fluctuation respectively, thereby realizing the correlation calculation between local measurement physical quantities.
Description
Technical Field
The utility model belongs to nuclear fusion plasma diagnosis field, concretely relates to restraint physical parameter measuring device.
Background
In the experimental research of magnetic confinement controlled nuclear fusion, plasma density fluctuation, electric field fluctuation and magnetic field fluctuation are key parameters in plasma transport and confinement physical research, and the correlation among the parameters is closely related to abnormal plasma radial transport and closely related to fusion plasma running in a high confinement mode. Especially, with the continuous improvement of plasma parameters, the research on magnetic turbulence is gradually becoming a hot point, and the diagnostic requirement on the local magnetic fluctuation measurement is higher and higher.
At present, in the research field, the local measurement of parameters such as plasma density fluctuation, electric field fluctuation and magnetic field fluctuation is basically completed by separate systems, and some diagnostic systems need to be in contact with plasma, such as an electrostatic probe and a magnetic probe system, a probe needs to be stretched into the plasma to realize the local measurement, and the interaction of the probe and the plasma cannot be avoided under the high-temperature plasma environment. Some systems rely on sophisticated auxiliary systems such as charge-recombination exchange spectroscopy and heavy ion beam probes. Laser diagnostics can measure density fluctuations and, after improvement, poloidal magnetic fields, however, cannot measure correlations between multiple physical quantities simultaneously. It is therefore desirable to design a device capable of simultaneously measuring the plasma density fluctuation, the electric field fluctuation and the magnetic field fluctuation and the correlation therebetween without disturbance.
Disclosure of Invention
The utility model aims at providing a support kamak density fluctuation and electromagnetic field fluctuation correlation measuring device, it can accurate measurement plasma density fluctuation, electric field fluctuation and magnetic field fluctuation and the correlation between them.
The technical scheme of the utility model as follows:
a device for measuring the correlation between Tokamak density fluctuation and electromagnetic field fluctuation comprises a transmitting microwave source and a microwave intrinsic source, and comprises a microwave transmitting link connected with the transmitting microwave source, a microwave intrinsic link connected with the microwave intrinsic source, a microwave receiving antenna and an orthogonal mode converter;
the microwave transmitting link comprises a first power divider connected with the output end of a transmitting microwave source, an isolator connected with one output end of the first power divider, a microwave transmitting antenna connected with the output end of the isolator, and a focusing lens and a polarizer which are positioned in the transmitting direction of the microwave transmitting antenna;
microwave signals of a transmitting microwave source are output through one path of the first power divider, are transmitted through a microwave antenna after passing through the isolator, are focused by using a focusing lens, and then enter the plasma by adjusting the linear polarization direction through the polarizer;
the microwave intrinsic link comprises a first frequency mixer for receiving an output signal of one output end of a microwave intrinsic source and an output signal of the other output end of the first power divider, a second power divider connected with the other output end of the microwave intrinsic source, a second frequency mixer for receiving one output signal of the second power divider and one output signal of the orthogonal mode converter, a third frequency mixer for receiving the other output signal of the second power divider and the other output signal of the orthogonal mode converter, a third power divider connected with the output end of the second frequency mixer, a fourth power divider connected with the output end of the third frequency mixer and a fifth power divider connected with the output end of the first frequency mixer;
the orthogonal mode converter receives signals transmitted by the microwave receiving antenna, and two output ends of the orthogonal mode converter are respectively connected with the radio frequency input ends of the second mixer and the third mixer;
one path of signal output after the power division of the fifth power divider is orthogonally demodulated with one path of output signal of the third power divider;
and the other path of signal output after the power division of the fifth power divider is orthogonally demodulated with one path of output signal of the fourth power divider.
One path of signal output after the power division of the fifth power divider and one path of output signal of the third power divider are orthogonally demodulated through a first orthogonal demodulator;
and the other path of signal output after the power division of the fifth power divider and one path of output signal of the fourth power divider are subjected to quadrature demodulation through a second quadrature demodulator.
The other path of output of the third power divider is a first detection end, and the output power signal P of the first detection end is a power signalX(ii) a The other path of output of the fourth power divider is a second detection end, which outputs a power signal P0。
The microwave receiving antenna is provided with an angle rotating device.
And a microwave amplifier is arranged between the second power divider and the microwave intrinsic source.
And a microwave amplifier is arranged between the fifth power divider and the first quadrature demodulator.
And a microwave amplifier is arranged between the first power divider and the isolator.
The gain of the microwave amplifier is 20-50 dB.
The utility model discloses an effect as follows:
the device can realize the strict simultaneous measurement of plasma density fluctuation and magnetic fluctuation respectively, thereby realizing the correlation calculation between local measurement physical quantities, and the system has the characteristics of high integration level, simplicity, convenience, flexibility, low cost and easy maintenance;
and the microwave amplifier is arranged at the front ends of the second power divider and the fifth power divider and used for ensuring that the input intrinsic power after power division can meet the driving power requirements of the mixer and the quadrature demodulator.
A microwave amplifier is arranged between the first power divider and the isolator and used for amplifying transmitting microwave power, and the isolator is used for preventing parasitic reflection.
Drawings
FIG. 1 is a schematic view of a Tokamak density fluctuation and electromagnetic field fluctuation correlation measurement device;
in the figure: 1. emitting a microwave source; 2. a first power divider; 3. an isolator; 4. a transmitting antenna; 5. a focusing lens; 6. a polarizer; 7. a first mixer; 8. a microwave intrinsic source; 9. a second power divider; 10. a second mixer; 11. a quadrature converter; 12. a microwave receiving antenna; 13. a third power divider; 14. a third mixer; 15. a fourth power divider; 16. a fifth power divider; 17. a first quadrature demodulator; 18. a second quadrature demodulator; a first detection terminal; 20. a second detection terminal.
Detailed Description
The present invention will be further explained with reference to the drawings and the detailed description.
In the following device names of components, the terms "first", "second", etc. do not denote any logical precedence but merely distinguish the same components included in the system.
As shown in fig. 1, the structure of the measuring apparatus is divided into a transmitting microwave source 1, a microwave transmitting chain, a microwave eigensource 8, a microwave eigenchain, a microwave receiving antenna 12, an orthogonal mode converter 11 and an orthogonal demodulator.
The microwave transmitting chain mainly comprises a first power divider 2 connected with an output end of a transmitting microwave source 1, an isolator 3 connected with one output end of the first power divider 2 (the other output end of the first power divider 2 is connected with a first mixer 7, which will be mentioned later), a microwave transmitting antenna 4 connected with an output end of the isolator 3, a focusing lens 5 located in the transmitting direction of the microwave transmitting antenna 4, and a polarizer 6.
Microwave signals of a transmitting microwave source 1 for detecting plasma are output through one path of a first power divider 2, transmitted through a microwave antenna 4 after passing through an isolator 3 and focused by a focusing lens 5, and then enter the plasma by adjusting the linear polarization direction through a polarizer 6.
As shown in fig. 1, the microwave intrinsic link includes a first mixer 7 for receiving one output signal of the microwave intrinsic source 8 and another output signal of the first power divider 2, a second power divider 9 connected to another output terminal of the microwave intrinsic source 8, a second mixer 10 for receiving one output signal of the second power divider 9 and one output signal of the orthogonal mode converter 11, a third mixer 14 for receiving another output signal of the second power divider 9 and another output signal of the orthogonal mode converter 11, a third power divider 13 connected to an output terminal of the second mixer 10, a fourth power divider 15 connected to an output terminal of the third mixer 14, and a fifth power divider 16 connected to an output terminal of the first mixer 7.
The quadrature demodulator includes: a first quadrature demodulator 17 for receiving one output signal of the fifth power divider 16 and one output signal of the third power divider 13, and a second quadrature demodulator 18 for receiving the other output signal of the fifth power divider 16 and one output signal of the fourth power divider 15.
The microwave receiving antenna 12 may be provided with an angle rotating device for adjusting the angle of the antenna, and the angle rotating device may be implemented by using well-known technologies.
Two output ends of the orthogonal analog converter 11 are respectively connected with radio frequency input ends of the second mixer 10 and the third mixer 14, and are used for decomposing the microwave signal received from the microwave receiving antenna 12 into two paths of orthogonal signals, wherein one path of orthogonal signals is parallel to the polarization direction of the incident signal, and the other path of orthogonal signals is perpendicular to the polarization direction of the incident signal.
The microwave intrinsic source 8 has two output signals, wherein one output signal and the output signal of the other output end of the first power divider 2 are mixed by the first mixer 7, frequency-reduced and then output, and then power-divided into two output signals by the fifth power divider 16.
The other output signal of the microwave intrinsic source 8 forms two output signals through the second power divider 9, wherein one output signal is mixed with one output signal of the orthogonal mode converter 11 through the second mixer 10 and then output, and the other output signal is mixed with the other output signal of the orthogonal mode converter 11 through the third mixer 14 and then output.
The signal output by the second mixer 10 after mixing is divided into two paths of output by the third power divider 13, and the signal output by the third mixer 14 after mixing is divided into two paths of output by the fourth power divider 15.
One path of signal after being power-divided by the fifth power divider 16 and one path of output signal of the third power divider 13 are orthogonally demodulated by the first orthogonal demodulator 17, and the other path of signal after being power-divided by the fifth power divider 16 and one path of output signal of the fourth power divider 15 are orthogonally demodulated by the second orthogonal demodulator 18. The other output of the third power divider 13Is a first detection terminal 19, which outputs a power signal PX(ii) a The other output of the fourth power divider 15 is a second detection terminal 20, which outputs a power signal P0。
For the part of the magnetic field fluctuation measurement link, the output signal mixed by the first mixer 7 will be used as an intrinsic reference signal for the back-end orthogonal demodulator. The received signal is output to the third mixer 14 as input through the orthogonal mode converter 11, and the microwave intrinsic source 8 is output to the third mixer 14 as intrinsic input through the second power divider 9, which is required to ensure that the intrinsic power input is enough to drive the mixer. The frequency-mixing output signal of the third mixer 14 is divided into two paths by the fourth power divider 15, one path is used for the second detection terminal 20 to judge the power, and the power signal P is output0(ii) a One path is used for the second quadrature demodulator 18 as a radio frequency input, the output signal of the first mixer 7 is output to the second quadrature demodulator 18 through the fifth power divider 16 as an intrinsic input, and the second quadrature demodulator 18 outputs two quadrature signals I and Q after demodulation. By performing fourier transform on the complex signal Q + j × I, a bilateral frequency power spectrum can be obtained, and the plasma fluctuation level can be characterized by the integral power of the spectrum.
Since the magnetic lines of force in the tokamak device have a certain inclination angle, the adjustable-angle microwave receiving antenna 12 needs to be adjusted in order to ensure that the signals output by the orthomode converter 11 are respectively perpendicular and parallel to the magnetic lines of force in the tokamak device.
The angle of the microwave receiving antenna is adjusted to ensure that signals output by the orthogonal mode converter 11 are respectively vertical and parallel to magnetic lines of force in the Tokamak device, strict simultaneous measurement of plasma density fluctuation and magnetic fluctuation is realized, correlation calculation between local measurement physical quantities is realized, and the system has the characteristics of high integration level, simplicity, convenience, flexibility, low cost, easiness in maintenance and the like.
Claims (8)
1. A device for measuring the correlation between Tokamak density fluctuation and electromagnetic field fluctuation comprises a transmitting microwave source (1) and a microwave intrinsic source (8), and is characterized in that: comprises a microwave transmitting chain circuit connected with a transmitting microwave source (1), a microwave intrinsic chain circuit connected with a microwave intrinsic source (8), a microwave receiving antenna (12) and an orthogonal mode converter (11);
the microwave transmitting link comprises a first power divider (2) connected with the output end of a transmitting microwave source (1), an isolator (3) connected with one output end of the first power divider (2), a microwave transmitting antenna (4) connected with the output end of the isolator (3), and a focusing lens (5) and a polarizer (6) which are positioned in the transmitting direction of the microwave transmitting antenna (4);
microwave signals of a transmitting microwave source (1) are output through one path of a first power divider (2), are transmitted through a microwave transmitting antenna (4) after passing through an isolator (3) and are focused by a focusing lens (5), and then enter plasma by adjusting the linear polarization direction through a polarizer (6);
the microwave intrinsic link comprises a first mixer (7) for receiving an output signal of one output end of a microwave intrinsic source (8) and an output signal of the other output end of a first power divider (2), a second power divider (9) connected with the other output end of the microwave intrinsic source (8), a second mixer (10) for receiving one output signal of the second power divider (9) and one output signal of an orthogonal mode converter (11), a third mixer (14) for receiving the other output signal of the second power divider (9) and the other output signal of the orthogonal mode converter (11), a third power divider (13) connected with the output end of the second mixer (10), a fourth power divider (15) connected with the output end of the third mixer (14), and a fifth power divider (16) connected with the output end of the first mixer (7);
the orthogonal mode converter (11) receives signals transmitted by the microwave receiving antenna (12), and two output ends of the orthogonal mode converter (11) are respectively connected with radio frequency input ends of the second mixer (10) and the third mixer (14);
one path of signal output by the fifth power divider (16) after power division is orthogonally demodulated with one path of output signal of the third power divider (13);
and the other path of signal output after the power division of the fifth power divider (16) is orthogonally demodulated with the output signal of the fourth power divider (15).
2. The apparatus for measuring correlation between density fluctuations and electromagnetic field fluctuations of tokamak according to claim 1, characterized in that: one path of signal output after the power division of the fifth power divider (16) and one path of output signal of the third power divider (13) are orthogonally demodulated through a first orthogonal demodulator (17);
and the other path of signal output after the power division of the fifth power divider (16) and the output signal of the fourth power divider (15) are orthogonally demodulated through a second orthogonal demodulator (18).
3. The apparatus for measuring correlation between density fluctuations and electromagnetic field fluctuations of tokamak according to claim 1, characterized in that: the other path of output of the third power divider (13) is a first detection end (19) which outputs a power signal PX(ii) a The other path of the output of the fourth power divider (15) is a second detection end (20) which outputs a power signal P0。
4. The apparatus for measuring correlation between density fluctuations and electromagnetic field fluctuations of tokamak according to claim 1, characterized in that: an angle rotating device is arranged on the microwave receiving antenna (12).
5. The apparatus for measuring correlation between density fluctuations and electromagnetic field fluctuations of tokamak according to claim 1, characterized in that: a microwave amplifier is arranged between the second power divider (9) and the microwave intrinsic source (8).
6. The apparatus for measuring correlation between density fluctuations and electromagnetic field fluctuations of tokamak according to claim 1, characterized in that: a microwave amplifier is arranged between the fifth power divider (16) and the first quadrature demodulator (17).
7. The apparatus for measuring correlation between density fluctuations and electromagnetic field fluctuations of tokamak according to claim 1, characterized in that: a microwave amplifier is arranged between the first power divider (2) and the isolator (3).
8. The apparatus for measuring correlation between density fluctuation and electromagnetic field fluctuation according to claim 5, 6 or 7, wherein: the gain of the microwave amplifier is 20-50 dB.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112930015A (en) * | 2021-03-17 | 2021-06-08 | 核工业西南物理研究院 | Electromagnetic composite probe for plasma electromagnetic characteristic diagnosis |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112930015A (en) * | 2021-03-17 | 2021-06-08 | 核工业西南物理研究院 | Electromagnetic composite probe for plasma electromagnetic characteristic diagnosis |
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