CN107896412B - It is a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property - Google Patents
It is a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property Download PDFInfo
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- CN107896412B CN107896412B CN201710889252.8A CN201710889252A CN107896412B CN 107896412 B CN107896412 B CN 107896412B CN 201710889252 A CN201710889252 A CN 201710889252A CN 107896412 B CN107896412 B CN 107896412B
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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
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
- H05H1/0081—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature by electric means
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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
- H05H1/0006—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 radio frequency wave property, measuring system includes vacuum coaxial electrode, high frequency magnetic probe, power splitter, wave detector, phase discriminator, signal acquiring system, and vacuum coaxial electrode is for radiofrequency signal to be transferred to outside tokamak out of tokamak；High frequency magnetic probe is used to coupled RF signal；The amplitudes such as voltage probe and current probe signal, equiphase are assigned as two-way by power splitter；Wave detector detects the peak-to-peak value of voltage probe and current probe radiofrequency signal, as a result with DC signal output；Phase discriminator detects phase difference between voltage probe and current probe signal, as a result with DC signal output.Signal acquiring system will be in the voltage signal storage to computer of acquisition.
Description
Technical field
The present invention relates to the characteristic technical fields more particularly to one of ion cyclotron wave near measurement ion involution antenna itself
Plant the high frequency magnetic probe diagnostic system for measuring radio frequency wave property.
Background technique
Ion cyclotron wave auxiliary heating system is all main auxiliary heating system in most tokamak.Ion
Frequency range of the cyclotron wave in support Karma is substantially in 20-80MHz.It is currently operating frequency range in EAST in 25-
70MHz.Frequency electromagnetic waves are coupled in plasma by antenna, realize the heating of plasma.ICRF is mainly electromagnetism
Wave Fast Wave Heating, but slow wave is inevitable, so Measured Boundary, slow wave ratio is particularly important, to me
Optimize antenna, critically important effect can be played by improving rf wave coupling.It is understood that antenna heating effect and K compose close phase
It closes, after a series of activities such as Antenna Construction Design antenna installation are completed, we mainly pass through the phase changed between current strap
Potential difference is composed to change K.For example, antenna heats the heating mode that best state is (0, π, 0, π), K at this time is probably attached 14
Closely.Magnetic probe designed by us plays the role of composing K real-time monitoring, and the heated condition to antenna is a kind of monitoring well.
Besides we can be coupled to the power of probe by calculating to judge the heating effect of antenna, when antenna heating effect compares
The power that probe is coupled to when good is smaller.We can monitor plasma well at plasma boundary at present
Volume density, temperature, parameters such as potential, but necessary understanding is lacked to the characteristic of ion involution itself, in this context we
The a set of magnetic probe diagnostic system built is mainly used for the characteristic to measurement ion cyclotron wave itself.
Summary of the invention
The object of the invention is to remedy the disadvantages of known techniques, provides a kind of for measuring the high frequency of radio frequency wave property
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 radio frequency wave property, include that high frequency magnetic probe, vacuum are coaxial
Electrode, high vacuum coaxial line, filter, power splitter, wave detector, phase discriminator, data acquisition and procession module and computer, high frequency
The output end of magnetic probe connects vacuum coaxial electrode by high vacuum coaxial line, and vacuum coaxial electrode is connected by block isolating device and filtered
The input terminal of device, filter and power splitter connects, an output end tie geophone of power splitter, and other two of power splitter is defeated
The output end of outlet connection phase discriminator, wave detector and phase discriminator is all connected with the input terminal of data acquisition and procession module, and data are adopted
Collection connect computer with the output end of processing module, and the high frequency magnetic probe is located inside tokamak, high frequency magnetic probe coupling
The fast wave of ion cyclotron wave and the radiofrequency signal of slow wave are closed, radiofrequency signal is transmitted by high vacuum coaxial line and vacuum coaxial electrode
To outside tokamak, signal frequency is concentrated near ion cyclotron frequency by filter, the power splitter is by radio frequency
The amplitudes equiphase such as signal is assigned as two-way, by the amplitude of the rf wave signal of wave detector measurement coupling, is surveyed by phase discriminator
It measures the phase difference of the rf wave of close magnetic probe, wave detector and phase discriminator and the signal of output is sent to data acquisition and procession mould
Block, data acquisition and procession module utilize phase difference calculating ion cyclotron wave wave spectrum, and by calculated result be sent to computer into
Row storage.
The high frequency magnetic probe includes stainless steel cavity, cover board is equipped at the top of stainless steel cavity, in stainless steel
Ceramic shaft is equipped in cavity, ceramic shaft is equipped with coil, ceramic wafer is equipped in the inside bottom of stainless steel cavity, in the upper of cover board
Face is equipped with SMA adapter, inner conductor is equipped in stainless steel cavity, the both ends of the inner conductor are separately connected coil and SMA
Adapter, is also provided with gap on the cover board, and the coil is used for coupled RF signal, with SMA adapter by the signal of coupling
Output, gap be in order to electromagnetic signal can enter stainless steel cavity in, ceramic wafer be in order to prevent plasma enter it is stainless
Steel cavity damages magnetic spy needle thread loop.
The vacuum coaxial electrode is that a kind of BNC of 50 ohm of ceramic weldings barrier ultrahigh vacuum turns the switching of BNC
Head is mounted on tokamak wall in conjunction with vacuum flange and is used for transmission radiofrequency signal.
The wave detector is that smaller radiofrequency signal is measured using AD8307 chip, is a kind of by radiofrequency signal turn
Change the device of direct current signal one kind.
Phase discriminator is to utilize the phase difference between AD8302 chip measurement two-way radiofrequency signal.
The invention has the advantages that 1. it be that currently the only can detect in EAST ICRF antenna ion involution wave property nearby
Diagnostic system, it has good monitoring to act on the operational effect of entire ion cyclotron wave heating system.2. high frequency magnetic
Another advantage of probe be when realizing oneself function can't plasma itself have an impact, do not need toward etc.
The thing of ray etc is injected in gas ions.3. theoretical and structure is all fairly simple, convenient to carry out, price is relatively cheap.
Detailed description of the invention
Fig. 1 is high frequency magnetic probe diagnostic system overall structure figure.
Fig. 2 is that (Fig. 2 (a) is high frequency Magnetic probe array to the specific structure chart of probe；Fig. 2 (b) magnetic probe structure top view；
Fig. 2 (c) magnetic probe structural front view；Fig. 2 (d) magnetic probe structural side view).
Fig. 3 is antenna measurement platform basic block diagram.
Fig. 4 is the wave spectrogram that transmission line medium wave is measured on experiment porch.
Fig. 5 is the HFSS model configuration figure of probe.
Fig. 6 is the coefficient of coup result of HFSS simulation and the relational graph of frequency.
Specific embodiment
As shown in Figure 1, it is a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property, it include high frequency magnetic probe
1, vacuum coaxial electrode 2, high vacuum coaxial line 3, filter 4, power splitter 5, wave detector 6, phase discriminator 7, data acquisition and procession
The output end of module 8 and computer 9, high frequency magnetic probe 1 connects vacuum coaxial electrode 2 by high vacuum coaxial line 3, and vacuum is coaxial
Electrode 2 connects filter 4 by block isolating device 10, and filter 4 is connect with the input terminal of power splitter 5, an output end of power splitter 5
The output end of tie geophone 6, other two output end connection phase discriminator 7 of power splitter 5, wave detector 6 and phase discriminator 7 is all connected with
The output end of the input terminal of data acquisition and procession module 8, data acquisition and procession module 8 connects computer 9, the high frequency
Magnetic probe 1 is located inside tokamak, the fast wave of 1 coupled ion cyclotron wave of high frequency magnetic probe and the radiofrequency signal of slow wave, radio frequency
Signal is transferred to outside tokamak by high vacuum coaxial line 3 and vacuum coaxial electrode 2, by filter 4 by signal frequency
It concentrates near ion cyclotron frequency, the amplitudes equiphase such as radiofrequency signal is assigned as two-way by the power splitter 5, passes through detection
The amplitude of the rf wave signal of the measurement coupling of device 6, the phase difference of the rf wave of close magnetic probe, detection are measured by phase discriminator 7
The signal of output is sent to data acquisition and procession module 8 by device 6 and phase discriminator 7, and data acquisition and procession module 8 utilizes phase
Difference calculates ion cyclotron wave wave spectrum, and sends computer 9 for calculated result and store.
As shown in Fig. 2, the high frequency magnetic probe includes stainless steel cavity 11, it is equipped at the top of stainless steel cavity 11
Cover board 12 is equipped with ceramic shaft 13 in stainless steel cavity 11, and ceramic shaft 13 is equipped with coil 14, in the inside of stainless steel cavity 11
Bottom is equipped with ceramic wafer 15, is equipped with SMA adapter 16 in the upper surface of cover board 12, inner conductor 17 is equipped in stainless steel cavity 11,
The both ends of the inner conductor 17 are separately connected coil 14 and SMA adapter 16, and gap 18 is also provided on cover board 12, described
Coil 14 is used for coupled RF signal, is exported the signal of coupling with SMA adapter 16, and gap 18 is in order to which electromagnetic signal can be with
Into in stainless steel cavity 11, ceramic wafer 15 is that plasma enters stainless steel cavity in order to prevent, damages magnetic spy needle thread loop.
The vacuum coaxial electrode 2 is that a kind of BNC of 50 ohm of ceramic weldings barrier ultrahigh vacuum turns the switching of BNC
Head is mounted on tokamak wall in conjunction with vacuum flange and is used for transmission radiofrequency signal.
The wave detector 6 is that smaller radiofrequency signal is measured using AD8307 chip, is a kind of by radiofrequency signal
Convert the device of direct current signal one kind.
Phase discriminator 7 is to utilize the phase difference between AD8302 chip measurement two-way radiofrequency signal.
By building test platform in the coefficient of coup of transmission line calibration probe, actual power is calculated using the coefficient of coup
Density.Specific step is as follows.It is illustrated in figure 3 a basic structure of antenna measurement platform:
1,2,3,4,5,6 is six probes, and probe and transmission line inside are tangent.The calculating of surface density: we give radio frequency source
One power Pav, then according to formulaThe power solved at transmission line inside outer wall probe gap is close
Degree.
PInto=PFace× S is the power for being coupled to probe from gap, and S is the area in gap.Probe is measured using wave detector
Power beη is the coefficient of coup.Using the coefficient of coup, it is in place that tokamak middle probe institute can be found out
The power density set.
The calculating of wave number K: from general wave equation: Φ ≡ kx- ω t, x are distances, and ω is the wave velocity of wave, and t is the time.
Wave number k can be found out by the derivative for asking phase to adjust the distance,Time is not introduced into required k spectral term.It draws
By the value of the obtained k spectrum of antenna measurement platform, as shown in Figure 4.
We carry out having carried out electromagnetical analogies to probe before processing probe,
We are simulated using the coefficient of coup of the HFSS electromagnetic simulation software to probe, as shown in Figure 5.The wherein coefficient of coup and spy
The structure of needle itself has relationship, and such as the size in gap, the size and circle number, integrally-built size of probe etc. of coil are related
System.Fig. 5 is the model configuration figure on HFSS.
It is consistent with actual size that HFSS simulates size.The coupled systemes numerical value that we obtain can directly be read from HFSS result
Out.Fig. 6 is the result of simulation:
It is about -81.5dB that we, which simulate obtained H-couple probe coefficient, when 31.5MHz, this value and we
The data tested on experiment porch are almost the same.This is the result is that it is contemplated that the knot simulated in the case where actual conditions
Fruit, material object are also to be processed according to the size of simulation.At this point, coil gap area is S=20mm2, the diameter of circle is 8mm,
The size of metal shell is each 28mm of length and width, a height of 45mm.This size is modified according to their own needs, can be passed through
HFSS carries out parameter scanning.
The corresponding input radio frequency signal peak value of wave detector output direct current signal value has a coefficient of correspondence, phase discriminator
Phase difference has a coefficient of correspondence between the direct current signal value of output and its two-way radiofrequency signal inputted, the two coefficients pass through in advance
Calibration is crossed to provide.Wave detector output numerical value, the phase discriminator output numerical value, geophone calibration coefficient, mirror obtained thus according to experiment
Phase device calibration coefficient can calculate voltage probe radiofrequency signal peak-to-peak value, current probe radiofrequency signal peak-to-peak value and voltage and visit
Phase value between needle, current probe signal.
High frequency magnetic probe with must first pass through calibration before.When calibrating current probe, by vector network analyzer port 1
1 end of transmission line is connect, port 2 connects current probe, and voltage probe and transmission line load terminate 50 Ω standard terminations.By vector network point
Analyzer test frequency is chosen to be 29MHz~34MHz, and S is saved after stablizing21Modulus value and phase value, to calculate the coefficient of coup.It visits
The purpose of needle is to solve for power density there are two one, another is to calculate wave spectrum by measurement phase difference.Whole process
Radiofrequency signal is converted the radio signal transmission of coupling to wave detector phase discriminator by phase discriminator and wave detector by namely probe
For direct current signal, according to the coefficient of coup calibrated before, by collected voltage signal be converted into our needs power and
Phase difference calculates wave spectrum by phase signal further according to calculation method before.
Claims (5)
1. a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property, it is characterised in that: include high frequency magnetic probe,
Vacuum coaxial electrode, high vacuum coaxial line, filter, power splitter, wave detector, phase discriminator, data acquisition and procession module and meter
The output end of calculation machine, high frequency magnetic probe connects vacuum coaxial electrode by high vacuum coaxial line, and vacuum coaxial electrode passes through blocking
The input terminal of device connection filter, filter and power splitter connects, an output end tie geophone of power splitter, power splitter
The output end of other two output end connection phase discriminator, wave detector and phase discriminator is all connected with the input of data acquisition and procession module
The output end at end, data acquisition and procession module connects computer, and the high frequency magnetic probe is located inside tokamak, high frequency
The fast wave of H-couple probe ion cyclotron wave and the radiofrequency signal of slow wave, radiofrequency signal are coaxial by high vacuum coaxial line and vacuum
Electrode is transferred to outside tokamak, is concentrated on signal frequency near ion cyclotron frequency by filter, the function point
The amplitudes equiphase such as radiofrequency signal is assigned as two-way by device, by the amplitude of the rf wave wave signal of wave detector measurement coupling, is led to
The phase difference that phase discriminator measures the rf wave of close magnetic probe is crossed, the signal of output is sent to data and adopted by wave detector and phase discriminator
Collection and processing module, data acquisition and procession module utilizes phase difference calculating ion cyclotron wave wave spectrum, and calculated result is sent
It is stored to computer.
2. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property, feature exists
Include stainless steel cavity in the high frequency magnetic probe, cover board is equipped at the top of stainless steel cavity, in stainless steel cavity
Equipped with ceramic shaft, ceramic shaft is equipped with coil, is equipped with ceramic wafer in the inside bottom of stainless steel cavity, is equipped in the upper surface of cover board
SMA adapter is equipped with inner conductor in stainless steel cavity, and the both ends of the inner conductor are separately connected coil and SMA adapter,
It is provided with gap on the cover board, and the coil is used for coupled RF signal, the signal of coupling is exported with SMA adapter, gap
It is in order to which electromagnetic signal can enter in stainless steel cavity, ceramic wafer is that plasma enters stainless steel cavity in order to prevent, damage
Bad magnetic spy needle thread loop.
3. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property, feature exists
In: the vacuum coaxial electrode is that a kind of BNC of 50 ohm of ceramic weldings barrier ultrahigh vacuum turns the adapter of BNC, knot
Conjunction vacuum flange, which is mounted on tokamak wall, is used for transmission radiofrequency signal.
4. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property, feature exists
In: the wave detector is that smaller radiofrequency signal is measured using AD8307 chip, is a kind of that radiofrequency signal conversion is straight
Flow the device of signal one kind.
5. according to claim 1 a kind of for measuring the high frequency magnetic probe diagnostic system of radio frequency wave property, feature exists
In: phase discriminator is to utilize the phase difference between AD8302 chip measurement two-way radiofrequency signal.
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| CN108882492B (en) * | 2018-07-25 | 2019-08-16 | 北京航空航天大学 | Novel Mach probe |
| CN110351940B (en) * | 2019-06-11 | 2021-07-30 | 中国科学院合肥物质科学研究院 | High-frequency magnetic probe diagnosis system for measuring ion cyclotron radiation |
| CN110505744B (en) * | 2019-07-19 | 2020-11-17 | 北京航空航天大学 | Radio frequency compensation emission probe |
| CN113092896A (en) * | 2021-03-14 | 2021-07-09 | 郑州大学 | Plasma probe array diagnostic system behind vacuum switch arc |
| CN113295918B (en) * | 2021-05-10 | 2023-04-21 | 中国科学院合肥物质科学研究院 | Diagnostic system for measuring current and current intensity and phase difference of antenna |
| CN113536211B (en) * | 2021-07-24 | 2024-02-06 | 大连理工大学 | Numerical method for fast extraction of EAST tokamak magnetic signals |
| CN118098648A (en) * | 2024-04-23 | 2024-05-28 | 中国科学院合肥物质科学研究院 | Device for measuring 4.6GHz low clutter parallel refractive index in tokamak |
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| JPH07209391A (en) * | 1994-01-19 | 1995-08-11 | Seigo Matsuura | Composite type wide-band magnetic field measuring system |
| CN101882936A (en) * | 2009-05-08 | 2010-11-10 | 赵洪亮 | EAST-ICRF (Experimental Advanced Superconducting Tokamak-Ion Cyclotron Resonant Heating) transmitter impedance matching and regulating system |
| US8513939B2 (en) * | 2010-10-12 | 2013-08-20 | Applied Materials, Inc. | In-situ VHF voltage sensor for a plasma reactor |
| CN103995187B (en) * | 2013-04-22 | 2016-06-01 | 中国人民解放军63655部队 | X-band High-Power Microwave integrated radiation field measuring system |
| CN203859921U (en) * | 2014-05-04 | 2014-10-01 | 核工业西南物理研究院 | Polarized electron cyclotron emission (ECE) diagnosis system for measuring plasma current distribution |
| CN105049131B (en) * | 2015-05-24 | 2017-12-29 | 浙江大学 | A kind of direct method of sampling of New-type radio-frequency signal and system based on spatial sampling |
| CN105137306B (en) * | 2015-09-16 | 2018-06-26 | 杭州柯林电气股份有限公司 | The tracking of superfrequency partial discharge active noise inhibits measuring system and its method of work |
| CN107132415A (en) * | 2017-05-05 | 2017-09-05 | 中国科学院合肥物质科学研究院 | Ion involution antenna impedance measuring system based on voltage probe and current probe |
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