CN104634452A - Method of measuring plasma MHD perturbation by using far infrared laser interferometer - Google Patents
Method of measuring plasma MHD perturbation by using far infrared laser interferometer Download PDFInfo
- Publication number
- CN104634452A CN104634452A CN201310551725.5A CN201310551725A CN104634452A CN 104634452 A CN104634452 A CN 104634452A CN 201310551725 A CN201310551725 A CN 201310551725A CN 104634452 A CN104634452 A CN 104634452A
- Authority
- CN
- China
- Prior art keywords
- mhd
- laser interferometer
- perturbation
- plasma
- hcn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention belongs to a novel plasma MHD perturbation diagnosis method, and particularly relates to a method of measuring MHD perturbation of a plasma core part by using a far infrared laser interferometer. The method comprises the following steps: a Schottky diode detector with high sensitivity is arranged on an HCN laser interferometer for receiving beat signals; a signal output end adopts a preamplifier with a wide band-pass; pre-amplified output signals are introduced to a high-speed acquisition card for acquisition and storage; a far end reads data measured by the HCN laser interferometer, a specgram program is then used for analyzing a signal spectrum, and MHD perturbation happens to the plasma, a perturbation frequency f1 can be obtained from a (f1+f0) spectral line; and the spectrum measured by the HCN laser interferometer is compared with a result measured by a Mirnov magnetic probe and a soft X ray. The method of the invention has the advantages that MHD perturbation in a large frequency range can be measured; and the method can be applied to an interference/polarization system for other laser sources in the future, and MHD perturbation signals with higher frequency can be measured.
Description
Technical field
The invention belongs to a kind of new plasma MHD disturbance diagnostic method, be specifically related to the MHD disturbance that one utilizes far infrared (FIR) laser interferometer measurement plasma core.
Background technology
The disturbance of MHD instability is an emphasis problem in the research of tokamak (tokamak) plasma physics, it affects the constraint of plasma particle and energy, affect the running status of plasma, even can cause the generation that plasma discharge breaks, very big destruction is caused to tokamak first wall.Especially on current tokamak device, along with the raising of auxiliary heating power, in plasma, MHD disturbance behavior is very general, and how developing how effective MHD disturbance diagnostic tool is the prerequisite of carrying out MHD physical study.At present, tokamak upper MHD disturbance diagnostic tool mainly contains: Mirnov magnetic probe, grenz ray array, electron gyroradiation (ECE), Microwave reflectometry etc.Although above method technology is very ripe, but also there is the deficiency of some in some diagnosis, such as magnetic probe and microwave reflection can only measure marginarium plasma information, grenz ray detection be the set effect of multiple physical quantity, not easily judge the behavior source etc. of MHD.
Summary of the invention
The object of this invention is to provide a kind of method that FIR laser interferometer measures plasma MHD disturbance, it has expanded the diagnostic field of FIR laser interferometer in high-temperature plasma.
The present invention is achieved in that a kind of FIR laser interferometer measures the method for plasma MHD disturbance, and it comprises the steps,
(1) highly sensitive schottky diode detector is installed in HCN laser interferometer for receiving Beat Signal;
(2) signal output part adopts the prime amplifier that broadband leads to;
(3) introduce high-speed collection card collection by front putting output signal, and store;
(4) under MATLAB environment, far-end reads HCN laser interferometer system measuring channels data, then utilizes specgram process analysis signal spectrum, when there is MHD disturbance in plasma, and forcing frequency f
1can from (f
1+ f
0) spectral line acquisition;
(5) HCN laser interferometer measurement frequency spectrum and Mirnov magnetic probe, grenz ray measurement result are contrasted.
Advantage of the present invention is, FIR laser interferometer, in the application of MHD disturbance fields of measurement, can not affect its original electron density measurement ability; The MHD disturbance of plasma core area can be measured; Schottky diode detector has very high response frequency (>500kHz), and therefore, it can measure the MHD disturbance of very large frequency range; This method can be applied to the interference/polarimeter system of other LASER Light Source (as HCOOH) in the future, measures the MHD disturbing signal of higher frequency.
Accompanying drawing explanation
Fig. 1 is FIR interferometer measurement signal spectrum distribution schematic diagram;
Wherein, f
0fIR laser interferometer system intermediate frequency, f
1be MHD forcing frequency, beat signal frequency is by intermediate frequency f
0with side frequency (f
1+ f
0), (f
1-f
0), (2f
1+ f
0), (2f
1-f
0), (3f
1+ f
0), (3f
1-f
0) composition, forcing frequency f
1can from (f
1+ f
0) obtain.
Fig. 2 is HCN laser interferometer measurement MHD perturbation motion method implementation step figure;
Wherein, 1. high sensitivity schottky diode detector, 2. MHD disturbance, 3. broadband leads to prime amplifier, 4. data acquisition, storage, and 5. MATLAB frequency spectrum calculates, 6. measurement result contrast.
Fig. 3 is fish-bone mould (fishbone) disturbance that employing three kinds of different diagnostic methods measure on HL-2A
Wherein, a is HCN interferometer measurement passage (r/a ≈ 0.26) Beat Signal frequency spectrum, and b is Mirnov magnetic probe signal spectrum figure, and c is grenz ray frequency spectrum, and d is magnetic probe original signal.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail:
FIR laser interferometer measurement Tokamak Plasma MHD perturbation motion method, the existing HCN laser of HL-2A tokamak (wavelength is 337um) interferometer realizes.This system adopts low noise, highly sensitive schottky diode detector and broadband to lead to prime amplifier, successfully measures the MHD disturbance in HL-2A plasma.
FIR laser interferometer measurement road Beat Signal is
when in plasma, (B, ω occurring
1) MHD disturbance, measuring channels signal will be modulated into
carry out spectrum analysis to this signal, see that Fig. 1 shows, it is by centre frequency f
0with side frequency (f
1+ f
0), (f
1-f
0), (2f
1+ f
0), (2f
1-f
0), (3f
1+ f
0), (3f
1-f
0) ... composition.Forcing frequency f
1can from spectral line (f
1+ f
0) obtain, and to have size be f
0frequency displacement.HL-2A HCN laser interferometer adopts Grating Modulation to obtain f
0=10KHz, therefore, will there is the fixing frequency displacement of 10kHz in our measurement result.
FIR laser interferometer measurement Tokamak Plasma MHD perturbation motion method, the existing HCN laser interferometer of HL-2A realizes, and implementation step is shown in Fig. 2.
(1) highly sensitive schottky diode detector is installed in HCN laser interferometer for receiving Beat Signal;
(2) signal output part adopts the prime amplifier that broadband leads to, and amplifier requirements bandwidth is enough large, to guarantee that MHD disturbing signal is not by filtering;
(3) introduce high-speed collection card collection by front putting output signal, and store, require that capture card sampling rate is enough high, be convenient to carry out spectrum analysis to signal;
(4) under MATLAB environment, far-end reads HCN laser interferometer system measuring channels data, then utilizes specgram process analysis signal spectrum, when there is MHD disturbance in plasma, and forcing frequency f
1can from (f
1+ f
0) spectral line acquisition;
(5) HCN laser interferometer measurement frequency spectrum and Mirnov magnetic probe, grenz ray measurement result are contrasted.
Fig. 3 is fish-bone mould (fishbone) disturbance that HL-2A device is measured, and HCN interferometer measurement result exists 10kHz frequency displacement, and consistent with Mirnov magnetic probe, grenz ray measurement result.
Claims (1)
1. measure a method for plasma MHD disturbance with FIR laser interferometer, it is characterized in that: it comprises the steps,
(1) highly sensitive schottky diode detector is installed in HCN laser interferometer for receiving Beat Signal;
(2) signal output part adopts the prime amplifier that broadband leads to;
(3) introduce high-speed collection card collection by front putting output signal, and store;
(4) under MATLAB environment, far-end reads HCN laser interferometer system measuring channels data, then utilizes specgram process analysis signal spectrum, when there is MHD disturbance in plasma, and forcing frequency f
1can from (f
1+ f
0) spectral line acquisition;
(5) HCN laser interferometer measurement frequency spectrum and Mirnov magnetic probe, grenz ray measurement result are contrasted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310551725.5A CN104634452A (en) | 2013-11-08 | 2013-11-08 | Method of measuring plasma MHD perturbation by using far infrared laser interferometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310551725.5A CN104634452A (en) | 2013-11-08 | 2013-11-08 | Method of measuring plasma MHD perturbation by using far infrared laser interferometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104634452A true CN104634452A (en) | 2015-05-20 |
Family
ID=53213455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310551725.5A Pending CN104634452A (en) | 2013-11-08 | 2013-11-08 | Method of measuring plasma MHD perturbation by using far infrared laser interferometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104634452A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112040625A (en) * | 2020-07-21 | 2020-12-04 | 西安电子科技大学 | High-precision high-space-time resolution three-dimensional determination method, system, medium and application |
| CN113762475A (en) * | 2021-08-27 | 2021-12-07 | 核工业西南物理研究院 | Prediction basis visualization method of plasma fracture predictor |
| CN113779855A (en) * | 2021-09-02 | 2021-12-10 | 大连理工大学 | Method for solving fishbone mode dispersion relation in tokamak plasma |
-
2013
- 2013-11-08 CN CN201310551725.5A patent/CN104634452A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112040625A (en) * | 2020-07-21 | 2020-12-04 | 西安电子科技大学 | High-precision high-space-time resolution three-dimensional determination method, system, medium and application |
| CN113762475A (en) * | 2021-08-27 | 2021-12-07 | 核工业西南物理研究院 | Prediction basis visualization method of plasma fracture predictor |
| CN113762475B (en) * | 2021-08-27 | 2023-08-15 | 核工业西南物理研究院 | Prediction basis visualization method of plasma fracture predictor |
| CN113779855A (en) * | 2021-09-02 | 2021-12-10 | 大连理工大学 | Method for solving fishbone mode dispersion relation in tokamak plasma |
| CN113779855B (en) * | 2021-09-02 | 2024-02-06 | 大连理工大学 | Method for solving fishbone mode dispersion relation in Tokamak plasma |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103616571B (en) | Based on electric field detecting method and the device of Rydberg atom Stark effect | |
| CN102707208B (en) | Positioning system and method of local discharge of transformer | |
| CN107560644B (en) | Distributed optical fiber sensing device based on signal multiplexing perception and demodulation | |
| CN103575504A (en) | Optical time-domain reflectometer based on superconductivity nanowire single photon detector | |
| CN103712960B (en) | A kind of Opto-thertnal detection device and detection method thereof adopting cascade phase lock-in detecting | |
| CN104714110A (en) | Device and method for measuring high-frequency microwave field strength based on electromagnetic induction transparent effect | |
| Harrison et al. | The appearance and propagation of filaments in the private flux region in mega amp spherical tokamak | |
| CN102944765A (en) | Low-frequency-stage magnetic sensor background noise measuring method | |
| CN204439100U (en) | Dynamic distributed Brillouin light fiber sensing equipment | |
| CN104634452A (en) | Method of measuring plasma MHD perturbation by using far infrared laser interferometer | |
| CN105043930A (en) | Detection device and method for metal steam atomic density of microstructure alkali metal gas chambers | |
| CN201725011U (en) | Alternating Current (AC) measuring device of solar battery quantum efficiency | |
| CN203572631U (en) | Optical time-domain reflectometer based on superconducting nanowire single-photon detector | |
| CN103823175A (en) | Photoelectric detection circuit frequency response characteristic test method based on OTDR | |
| CN104034515B (en) | The unstable monitoring method of optical-fiber laser pattern of surveying based on scattered light | |
| CN103105541B (en) | Near field probe used for detecting electromagnetic interference radiation performance and application method thereof | |
| CN113358218A (en) | Lithium niobate waveguide infrared two-photon coincidence measurement device and method based on periodic polarization | |
| CN101520509A (en) | Method for comparatively measuring range of interframe of chaotic light time domain waveform | |
| Inman et al. | Detection of liquid water in the flow channels of PEM fuel cell using an optical sensor | |
| CN101871992A (en) | Alternating current measuring device for quantum efficiency of solar battery and using method thereof | |
| CN103091568B (en) | A kind of avalanche photodiode excessive noise factor measuring system | |
| CN103048061B (en) | Device for detecting transient temperature of divertor graphite tile through reflecting terahertz spectrum technique | |
| CN108132094B (en) | Distributed optical fiber vibration sensing device and method based on pulsed light | |
| CN101893679A (en) | Direct-current measuring device for quantum efficiency of solar cell and using method thereof | |
| CN204758834U (en) | Alpha particle measurement appearance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150520 |
|
| RJ01 | Rejection of invention patent application after publication |