CN110351940A - It is a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation - Google Patents
It is a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation Download PDFInfo
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- CN110351940A CN110351940A CN201910501253.XA CN201910501253A CN110351940A CN 110351940 A CN110351940 A CN 110351940A CN 201910501253 A CN201910501253 A CN 201910501253A CN 110351940 A CN110351940 A CN 110351940A
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- H—ELECTRICITY
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- 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
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
- H05H1/0087—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature by magnetic means
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Abstract
The invention discloses a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, including vacuum coaxial electrode, high temperature high voltage resistant coaxial cable, hyperfrequency magnetic probe, power splitter, wave detector, spectrum analyzer, signal acquiring system, vacuum coaxial electrode is with coaxial for radiofrequency signal to be transferred to outside tokamak out of tokamak；Hyperfrequency magnetic probe is used to coupled RF signal；Power splitter is divided into eight road signals for the amplitudes such as source signal；Wave detector detects the peak-to-peak value of voltage probe radiofrequency signal, as a result with DC signal output；Radiofrequency signal is transformed into frequency domain from time domain by spectrum analyzer；The voltage signal of acquisition is deposited category to computer by signal acquiring system.Magnetic probe diagnostic system of the present invention is passively, rf wave or gas will not to be injected into plasma, therefore plasma does not have any influence, there is great meaning for research fusion Alpha ion and energetic beam ions, structure is simple, at low cost, easy to operate.
Description
Technical field
The present invention relates to the studying technological domains to energetic ion in tokamak, more particularly to one kind is for measuring ion
The high frequency magnetic probe diagnostic system of cyclotron radiation, energetic ion mainly include the energetic ion that nuclear fusion generates and auxiliary heating system
The energetic ion that heating plasma of uniting generates, research energetic ion have important meaning for the realization of the following nuclear fusion.
Background technique
Ion cyclotron radiation is a kind of electromagnetic radiation near ion involution frequency range generated in magnetically confined plasma,
It is driven by local energetic ion, and it is that a kind of magnetosonic convolution is unstable that ion cyclotron radiation is analyzed in terms of its physical mechanism
Property, interaction of this unstability from energetic ion and fast Alfven wave.Early in eighties of last century the 80s and 90s by
Ion cyclotron radiation has been detected on the JET of Britain for the first time and has found that ion cyclotron radiation signal strength and neutron irradiation are strong
Linear relationship is presented in six magnitudes in degree.They also found simultaneously, and the frequency of ion cyclotron radiation and background toroidal magnetic field are closed
System is close, and toroidal current also has a certain impact to ion cyclotron radiation frequency, although it not is very big for influencing.With descendant
Influence of the magnetohydrodynamics unstability to ion cyclotron radiation is also found, the reason is that since magnetohydrodynamics is unstable
Property causes the variation of energetic ion content and distribution.It has been found that ELM outburst, fish-bone mould, saw on many devices
Influence of the hydromagnetic instabilities such as tooth mould to ion cyclotron radiation.And the probe used mainly is exactly two kinds: 1) is mounted on low
The coil for coupled ion cyclotron radiation signal of field side；2) ion involution wave antenna, because ion involution antenna is inherently
It is a magnetic probe.The energetic ion that research ion cyclotron radiation generates future studies fusion has important meaning, and
The following fusion diagnoses indispensable diagnostic method.
Summary of the invention
The object of the invention is to remedy the disadvantages of known techniques, provides a kind of for measuring the height of ion cyclotron radiation
Frequency magnetic probe diagnostic system.
The present invention is achieved by the following technical solutions:
It is a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, it is characterised in that: include high frequency magnetic probe,
Vacuum coaxial electrode, high vacuum coaxial line, block isolating device, power splitter, filter, wave detector, data acquisition and procession module, frequency spectrum
Analyzer and computer.The high frequency magnetic probe is located at the inside of tokamak, and high frequency magnetic probe circles round for coupled ion
Radiation signal, the ion cyclotron radiation signal being coupled to are transferred to outside tokamak by high vacuum coaxial line and coaxial electrode
Then the amplitudes such as signal are divided into eight road signals by power splitter by portion, wherein seven road signals pass through filter and wave detector
The amplitude signal intensity in each frequency range is measured, the signal of output is sent to data acquisition and procession module, data by wave detector
Acquisition calculates ion cyclotron radiation value using the amplitude of rf wave signal with processing module, and sends computer for calculated result
It is stored, and the another way signal of power splitter is sent to spectrum analyzer, spectrum analyzer converts radiofrequency signal from time domain
To frequency domain and it is sent to computer and carries out storage in case subsequent calculating.
The high frequency magnetic probe includes stainless steel fixed frame, adjustable plate, coil support frame and copper wire coil, the adjusting
Plate is fixed on stainless steel fixed frame, and coil support frame is fixed on one end of adjustable plate, and copper wire coil is fixed on by cable clamping interface
On coil support frame, polytetrafluoroethylene (PTFE) coil leather sheath is additionally provided between copper wire coil and coil support frame, high frequency magnetic probe is logical
Stainless steel fixed frame is crossed to be welded on tokamak inner wall.Stainless steel 316 L fixed frame by be welded on mark's wall fix it is whole
A structure, Stainless steel 316 L adjustable plate are used for adjusting the distance between probe and plasma, the cable clamping interface of fine copper, screw hole
In fixed cable clamping interface.Fine copper coil is a most important part for coupled ion cyclotron radiation signal.Adjustable plate is to pass through
The expansion plate of screw and nut secured adjusted length is adjusted before fixed, and length can not be adjusted after fixing.
The vacuum coaxial electrode is that a kind of BNC female of 50 ohm of ceramic weldings barrier ultrahigh vacuum turns BNC mother
Head is mounted on tokamak wall in conjunction with vacuum flange and is used for transmission ion cyclotron radiation signal.
The frequency spectrograph is the device that ion cyclotron radiation signal is transformed into frequency domain from time domain.
Filter is that the signal for coming out power splitter carries out band frequency filtering, and only specific frequency can pass through.
Spectrum analyzer is a kind of equipment for converting frequency domain from time domain for radiofrequency signal, in order to which we divide frequency spectrum
Analysis.
The invention has the advantages that magnetic probe diagnostic system of the present invention is passively, radio frequency will not to be injected into plasma
Wave or gas, therefore plasma does not have any influence, has for research fusion Alpha ion and energetic beam ions
Great meaning, structure is simple, at low cost, easy to operate.
Detailed description of the invention
Fig. 1 is system construction drawing of the invention.
Fig. 2 is the structural schematic diagram of high frequency magnetic probe of the invention.
Fig. 3 is the top view of high frequency magnetic probe.
Fig. 4 is filter calibration curve graph.
Specific embodiment
As shown in Figure 1, it is a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, it include high frequency magnetic spy
Needle 1, vacuum coaxial electrode 2, high vacuum coaxial line, block isolating device 3, power splitter 4, filter 5, wave detector 6, data acquisition and procession
Module 7, spectrum analyzer 8 and computer 16, the high frequency magnetic probe 1 are located inside tokamak 9, high frequency magnetic probe 1
Output end connects vacuum coaxial electrode 2 by high vacuum coaxial line, and vacuum coaxial electrode 2 connects power splitter 4 by block isolating device 3,
A part of signal of power splitter 4 is connect with the input terminal of filter 5, the input for the signal tie geophone 6 that filter 5 comes out
End, the input terminal of output end connection the data acquisition and processing module 7 of wave detector 6, the output end of data acquisition and procession module 7
Connect computer；The another part signal access that power splitter 4 the comes out spectrum analyzer 8.
1 coupled ion cyclotron radiation signal of high frequency magnetic probe, ion cyclotron radiation signal is by high vacuum coaxial line and very
Empty coaxial electrode 2 is transferred to outside tokamak 9, and by power splitter 4 by the eight road signals that are divided into of the amplitudes such as signal, a part is believed
The amplitude of signal in different frequency range number is measured by filter 5 and wave detector 6, the signal of output is sent to number by wave detector 6
According to acquisition and processing module 7,7 pieces of the data acquisition and procession mould amplitudes using rf wave signal calculate ion cyclotron radiation value,
And computer is sent by calculated result and is stored；Another part signal passed through from power splitter 4 is sent to spectrum analyzer
8, radiofrequency signal is transformed into frequency domain from time domain and is sent to computer and stored by spectrum analyzer 8.
As shown in Figure 2,3, the high frequency magnetic probe 1 includes stainless steel fixed frame 10, adjustable plate 11, coil support frame
12 and copper wire coil 13, the adjustable plate 11 be fixed on stainless steel fixed frame 10, coil support frame 12 is fixed on adjustable plate
11 one end, copper wire coil 13 is fixed on coil support frame 12 by cable clamping interface 14, in copper wire coil 13 and coil support frame
Polytetrafluoroethylene (PTFE) coil leather sheath 15 is additionally provided between 12, high frequency magnetic probe 1 is welded to tokamak 9 by stainless steel fixed frame 10
On inner wall.Stainless steel 316 L fixed frame 10 fixes total by being welded on mark's wall, Stainless steel 316 L adjustable plate 11
For adjusting the distance between probe and plasma, the cable clamping interface of fine copper, screw hole is for fixing cable clamping interface.Fine copper coil is
A most important part is used for coupled ion cyclotron radiation signal.
The vacuum coaxial electrode 2 is that a kind of BNC female of 50 ohm of ceramic weldings barrier ultrahigh vacuum turns BNC mother
Head is mounted on tokamak wall in conjunction with vacuum flange and is used for transmission ion cyclotron radiation signal.
The wave detector 6 is that smaller ion cyclotron radiation signal is measured using AD8307 chip, is a kind of incite somebody to action
The device of radiofrequency signal conversion direct current signal.
The spectrum analyzer 8 is a kind of equipment for converting frequency domain from time domain for radiofrequency signal, in order to which we are to frequency
The analysis of spectrum.
Fig. 4 is the calibration curve of filter 5, according to the calibration curve of filter our available rf waves in different frequencies
Intensity in section.According to the intensity in different frequency range, rough Fourier transformation may be implemented.
Claims (4)
1. a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, it is characterised in that: include high frequency magnetic spy
Needle, vacuum coaxial electrode, high vacuum coaxial line, block isolating device, power splitter, filter, wave detector, data acquisition and procession module,
Spectrum analyzer and computer, the high frequency magnetic probe are located at the inside of tokamak, high frequency H-couple probe ion involution
Radiation signal, the ion cyclotron radiation signal being coupled to are transferred to tokamak by high vacuum coaxial line and vacuum coaxial electrode
Then the amplitudes such as signal are divided into eight road signals by power splitter by outside, wherein seven road signals pass through filter and detection
Device measures the amplitude signal intensity in each frequency range, and the signal of output is sent to data acquisition and procession module by wave detector, number
Ion cyclotron radiation value is calculated using the amplitude of rf wave signal with processing module according to acquisition, and sends calculating for calculated result
Machine is stored, and the another way signal of power splitter is sent to spectrum analyzer, and spectrum analyzer turns radiofrequency signal from time domain
Change to frequency domain and is sent to computer and is stored.
2. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, feature
Be: the high frequency magnetic probe includes stainless steel fixed frame, adjustable plate, coil support frame and copper wire coil, the tune
Section plate is fixed on stainless steel fixed frame, and coil support frame is fixed on one end of adjustable plate, and copper wire coil is fixed by cable clamping interface
On coil support frame, polytetrafluoroethylene (PTFE) coil leather sheath, high frequency magnetic probe are additionally provided between copper wire coil and coil support frame
It is fixed on tokamak inner wall by stainless steel fixed frame.
3. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, feature
Be: the vacuum coaxial electrode is that a kind of BNC female of 50 ohm of ceramic weldings barrier ultrahigh vacuum turns BNC female,
It is mounted on tokamak wall in conjunction with vacuum flange and is used for transmission ion cyclotron radiation signal.
4. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of ion cyclotron radiation, feature
Be: the frequency spectrograph is the device that ion cyclotron radiation signal is transformed into frequency domain from time domain.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110809355A (en) * | 2019-11-04 | 2020-02-18 | 中国科学院合肥物质科学研究院 | Langmuir probe multi-Mmewwell electron distribution automatic analysis method |
| 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 |
| CN113380429A (en) * | 2021-05-18 | 2021-09-10 | 清华大学 | Plasma signal acquisition device and acquisition method |
| CN117214585A (en) * | 2023-11-06 | 2023-12-12 | 中国科学院合肥物质科学研究院 | Detection device and detection method for transmission device of ion cyclotron system |
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| CN117214585A (en) * | 2023-11-06 | 2023-12-12 | 中国科学院合肥物质科学研究院 | Detection device and detection method for transmission device of ion cyclotron system |
| CN117214585B (en) * | 2023-11-06 | 2024-02-23 | 中国科学院合肥物质科学研究院 | Detection device and detection method for transmission device of ion cyclotron system |
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