CN110351940B - High-frequency magnetic probe diagnosis system for measuring ion cyclotron radiation - Google Patents
High-frequency magnetic probe diagnosis system for measuring ion cyclotron radiation Download PDFInfo
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- CN110351940B CN110351940B CN201910501253.XA CN201910501253A CN110351940B CN 110351940 B CN110351940 B CN 110351940B CN 201910501253 A CN201910501253 A CN 201910501253A CN 110351940 B CN110351940 B CN 110351940B
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Abstract
The invention discloses a high-frequency magnetic probe diagnosis system for measuring ion cyclotron radiation, which comprises a vacuum coaxial electrode, a high-temperature and high-pressure resistant coaxial cable, an ultrahigh-frequency magnetic probe, a power divider, a wave detector, a spectrum analyzer and a signal acquisition system, wherein the vacuum coaxial electrode and the vacuum coaxial cable are used for transmitting radio-frequency signals from inside to outside of a tokamak; the ultrahigh frequency magnetic probe is used for coupling radio frequency signals; the power divider divides the source signal into eight paths of signals with equal amplitude; the detector detects the peak-to-peak value of the radio frequency signal of the voltage probe, and the result is output as a direct current signal; the spectrum analyzer converts the radio frequency signal from a time domain to a frequency domain; the signal acquisition system stores the acquired voltage signals into a computer. The magnetic probe diagnosis system is passive, does not inject radio frequency waves or gas into the plasma, has no influence on the plasma, has great significance for researching fusion alpha ions and high-energy beam ions, and has the advantages of simple structure, low cost and convenient operation.
Description
Technical Field
The invention relates to the technical field of research on high-energy ions in tokamak, in particular to a high-frequency magnetic probe diagnosis system for measuring ion cyclotron radiation.
Background
Ion cyclotron radiation is electromagnetic radiation generated in a magnetic confinement plasma and around an ion cyclotron frequency band, and is driven by local high-energy ions, and the analysis of the ion cyclotron radiation from the aspect of a physical mechanism is magnetoacoustic cyclotron instability, and the instability is caused by the interaction of the high-energy ions and a fast alfen wave. Ion cyclotron radiation was first detected by JET in the uk as early as the eighty-ninety years of the last century and it was found that the ion cyclotron radiation signal intensity and the neutron radiation intensity exhibit a linear relationship in six orders of magnitude. Meanwhile, the frequency of ion cyclotron radiation is closely related to a background toroidal magnetic field, and toroidal current has a certain influence on the frequency of the ion cyclotron radiation, although the influence is not very large. It was subsequently discovered that the effect of magnetohydrodynamic instability on ion cyclotron radiation was due to changes in the high energy ion content and distribution caused by the magnetohydrodynamic instability. The influence of the electromagnetic fluid instability such as ELM outbreak, fishbone model, sawtooth model and the like on ion cyclotron radiation is found in a plurality of devices. The probes used are mainly of two types: 1) a coil mounted on the low field side for coupling ion cyclotron radiation signals; 2) ion cyclotron antenna, because ion cyclotron antenna is itself a magnetic probe. The research on ion cyclotron radiation has important significance for the future research on high-energy ions generated by fusion, and is also an indispensable diagnostic method for future fusion diagnosis.
Disclosure of Invention
The invention aims to remedy the defects of the prior art and provides a high-frequency magnetic probe diagnostic system for measuring ion cyclotron radiation.
The invention is realized by the following technical scheme:
a high frequency magnetic probe diagnostic system for measuring ion cyclotron radiation, characterized by: the device comprises a high-frequency magnetic probe, a vacuum coaxial electrode, a high-vacuum coaxial line, a DC blocking device, a power divider, a filter, a wave detector, a data acquisition and processing module, a spectrum analyzer and a computer. The high-frequency magnetic probe is positioned inside the Tokamak and used for coupling ion cyclotron radiation signals, the coupled ion cyclotron radiation signals are transmitted to the outside of the Tokamak through a high-vacuum coaxial line and a coaxial electrode, then the signals are divided into eight paths of signals with equal amplitude through a power divider, seven paths of signals measure the amplitude signal intensity in each frequency band through a filter and a detector, the detector sends the output signals to a data acquisition and processing module, the data acquisition and processing module calculates ion cyclotron radiation values by using the amplitudes of radio frequency wave signals and sends calculation results to a computer for storage, the other path of signals of the power divider is sent to a spectrum analyzer, and the spectrum analyzer converts the radio frequency signals from a time domain to a frequency domain and sends the radio frequency signals to the computer for storage for later calculation.
The high-frequency magnetic probe comprises a stainless steel fixing frame, an adjusting plate, a coil supporting frame and a copper wire coil, wherein the adjusting plate is fixed on the stainless steel fixing frame, the coil supporting frame is fixed at one end of the adjusting plate, the copper wire coil is fixed on the coil supporting frame through a wire clamping groove, a polytetrafluoroethylene coil leather sleeve is further arranged between the copper wire coil and the coil supporting frame, and the high-frequency magnetic probe is welded on the inner wall of the support clamp mark through the stainless steel fixing frame. The stainless steel 316L fixing frame is welded on the wall of the mark to fix the whole structure, the stainless steel 316L adjusting plate is used for adjusting the distance between the probe and the plasma, the pure copper wire clamping groove and the screw hole are used for fixing the wire clamping groove. A pure copper coil is the most important one for coupling the ion cyclotron radiation signal. The adjusting plate is a telescopic plate with the length adjusted through the fixation of a screw nut, the adjusting plate is adjusted before the fixation, and the length cannot be adjusted after the fixation.
The vacuum coaxial electrode is a fifty-ohm ceramic welding BNC female head-to-BNC female head for blocking ultrahigh vacuum, and is combined with a vacuum flange to be installed on a Tokamak wall for transmitting ion cyclotron radiation signals.
The spectrometer is a device for converting an ion cyclotron radiation signal from a time domain to a frequency domain.
The filter is used for carrying out band-frequency filtering on the signal from the power divider, and only a specific frequency can pass through the filter.
A spectrum analyzer is a device that transforms a radio frequency signal from the time domain to the frequency domain to facilitate our analysis of the spectrum.
The invention has the advantages that: the magnetic probe diagnosis system is passive, does not inject radio frequency waves or gas into the plasma, has no influence on the plasma, has great significance for researching fusion alpha ions and high-energy beam ions, and has the advantages of simple structure, low cost and convenient operation.
Drawings
FIG. 1 is a system block diagram of the present invention.
FIG. 2 is a schematic view of the structure of the high-frequency magnetic probe of the present invention.
FIG. 3 is a top view of the high frequency magnetic probe.
Fig. 4 is a graph of filter calibration.
Detailed Description
As shown in fig. 1, a high-frequency magnetic probe diagnostic system for measuring ion cyclotron radiation comprises a high-frequency magnetic probe 1, a vacuum coaxial electrode 2, a high-vacuum coaxial line, a dc blocking device 3, a power divider 4, a filter 5, a detector 6, a data acquisition and processing module 7, a spectrum analyzer 8 and a computer 16, wherein the high-frequency magnetic probe 1 is located inside a tokamak 9, an output end of the high-frequency magnetic probe 1 is connected with the vacuum coaxial electrode 2 through the high-vacuum coaxial line, the vacuum coaxial electrode 2 is connected with the power divider 4 through the dc blocking device 3, a part of signals of the power divider 4 are connected with an input end of the filter 5, a signal output from the filter 5 is connected with an input end of the detector 6, an output end of the detector 6 is connected with an input end of the data acquisition and processing module 7, and an output end of the data acquisition and processing module 7 is connected with the computer; another part of the signal from the power divider 4 is connected to the spectrum analyzer 8.
The high-frequency magnetic probe 1 is coupled with an ion cyclotron radiation signal, the ion cyclotron radiation signal is transmitted to the outside of a Tokamak 9 through a high-vacuum coaxial line and a vacuum coaxial electrode 2, the signal is divided into eight paths of signals with equal amplitude through a power divider 4, a part of signals are measured by a filter 5 and a wave detector 6 to obtain the amplitudes of the signals in different frequency bands, the wave detector 6 sends the output signals to a data acquisition and processing module 7, the data acquisition and processing module 7 calculates an ion cyclotron radiation value by using the amplitudes of radio frequency wave signals, and the calculation result is sent to a computer for storage; the other part of the signal passing from the power divider 4 is sent to a spectrum analyzer 8, and the spectrum analyzer 8 converts the radio frequency signal from the time domain to the frequency domain and sends the radio frequency signal to a computer for storage.
As shown in fig. 2 and 3, the high-frequency magnetic probe 1 comprises a stainless steel fixing frame 10, an adjusting plate 11, a coil supporting frame 12 and a copper wire coil 13, the adjusting plate 11 is fixed on the stainless steel fixing frame 10, the coil supporting frame 12 is fixed at one end of the adjusting plate 11, the copper wire coil 13 is fixed on the coil supporting frame 12 through a wire clamping groove 14, a polytetrafluoroethylene coil leather sheath 15 is further arranged between the copper wire coil 13 and the coil supporting frame 12, and the high-frequency magnetic probe 1 is welded on the inner wall of the tokamak 9 through the stainless steel fixing frame 10. The stainless steel 316L fixing frame 10 fixes the whole structure by welding to the wall of the mark, the stainless steel 316L adjusting plate 11 is used for adjusting the distance between the probe and the plasma, the pure copper wire clamping groove and the screw hole are used for fixing the wire clamping groove. A pure copper coil is the most important one for coupling the ion cyclotron radiation signal.
The vacuum coaxial electrode 2 is a fifty-ohm ceramic welding barrier ultrahigh vacuum BNC female head, and is combined with a vacuum flange to be installed on a Tokamak wall for transmitting ion cyclotron radiation signals.
The detector 6 measures a relatively small ion cyclotron radiation signal by using an AD8307 chip, and is a device for converting a radio frequency signal into a direct current signal.
The spectrum analyzer 8 is a device that converts the radio frequency signal from the time domain to the frequency domain to facilitate our analysis of the spectrum.
Fig. 4 is a calibration curve of the filter 5, from which we can derive the intensity of the radio frequency wave in different frequency bands. Depending on the intensities in the different frequency bands, a coarse fourier transformation can be achieved.
Claims (1)
1. A high frequency magnetic probe diagnostic system for measuring ion cyclotron radiation, characterized by: the device comprises a high-frequency magnetic probe, a vacuum coaxial electrode, a high-vacuum coaxial line, a DC blocking device, a power divider, a filter, a wave detector, a data acquisition and processing module, a spectrum analyzer and a computer, wherein the high-frequency magnetic probe is positioned inside a Tokamak, the high-frequency magnetic probe is coupled with an ion cyclotron radiation signal, the coupled ion cyclotron radiation signal is transmitted to the outside of the Tokamak through the high-vacuum coaxial line and the vacuum coaxial electrode, then the power divider divides the signal into eight paths of signals with equal amplitude, seven paths of signals measure the amplitude signal intensity in each frequency band through the filter and the wave detector, the wave detector sends the output signal to the data acquisition and processing module, the data acquisition and processing module calculates the ion cyclotron radiation value by using the amplitude of a radio frequency wave signal and sends the calculation result to the computer for storage, and the other path of the power divider is sent to the spectrum analyzer, the spectrum analyzer converts the radio frequency signal from a time domain to a frequency domain and sends the radio frequency signal to a computer for storage;
the high-frequency magnetic probe comprises a stainless steel fixing frame, an adjusting plate, a coil supporting frame and a copper wire coil, wherein the adjusting plate is fixed on the stainless steel fixing frame;
the vacuum coaxial electrode is a fifty-ohm ceramic welding BNC female head-to-BNC female head for blocking ultrahigh vacuum, and is installed on a Tokamak wall in combination with a vacuum flange for transmitting ion cyclotron radiation signals;
the spectrum analyzer is a device for converting an ion cyclotron radiation signal from a time domain to a frequency domain.
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| CN110809355B (en) * | 2019-11-04 | 2022-02-11 | 中国科学院合肥物质科学研究院 | Langmuir probe multi-Mmewwell electron distribution automatic analysis method |
| CN112930015B (en) * | 2021-03-17 | 2021-11-30 | 核工业西南物理研究院 | Electromagnetic composite probe for plasma electromagnetic characteristic diagnosis |
| CN113380429B (en) * | 2021-05-18 | 2022-09-20 | 清华大学 | Plasma signal acquisition device and acquisition method |
| 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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