CN113108899A - Ground simulation research device for interaction between near-earth space plasma and laser - Google Patents
Ground simulation research device for interaction between near-earth space plasma and laser Download PDFInfo
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- CN113108899A CN113108899A CN202110378169.0A CN202110378169A CN113108899A CN 113108899 A CN113108899 A CN 113108899A CN 202110378169 A CN202110378169 A CN 202110378169A CN 113108899 A CN113108899 A CN 113108899A
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Abstract
The invention discloses a ground simulation research device for interaction of near-earth space plasma and laser, which comprises a vacuum pump, a vacuum cavity, an electromagnetic wave emission mechanism, a tunable laser and a detector, wherein the vacuum pump is connected with the vacuum cavity; the vacuum pump is used for adjusting the vacuum degree in the vacuum cavity; an excitation coil and a plasma generating mechanism are arranged in the vacuum cavity, the excitation coil generates a magnetic field with adjustable strength, and the plasma generating mechanism generates plasma and conveys the plasma into the magnetic field; the electromagnetic wave emission mechanism is arranged outside the vacuum cavity and has the functions of adjusting frequency and power, and sends electromagnetic waves to the magnetic field through the quartz window of the vacuum cavity; the tunable laser is of an irradiation angle adjustable structure, the detector is of a receiving angle adjustable structure, and the tunable laser sends laser to the detector after penetrating through the magnetic field and the plasma; the device can realize the analog adjustment of various parameters, thereby practically solving the problem of single research function in the prior art.
Description
Technical Field
The invention relates to the technical field of interaction simulation of plasma and laser, in particular to a ground simulation research device for interaction of near-earth space plasma and laser.
Background
The plasma is a special dispersion electromagnetic medium, has the characteristics of high energy content (the free energy density is far higher than that of other substances), multi-scale energy momentum transport and the like, and the research on the interaction of the plasma and substances such as laser, electromagnetic waves and the like has important influence on the national economy and the scientific and technical progress.
The space experiment is the most direct means for researching the interaction between the near-earth space plasma environment and the laser, however, the research on the interaction between the near-earth space plasma environment and the laser, which is carried out by simply adopting the space experiment, also represents certain limitations in the development process, for example, the space satellite detection cost is high, and meanwhile, global multi-point observation data is difficult to obtain.
Therefore, when the space on-orbit experiment is widely carried out, a proper ground simulation research device is established, and the ground simulation research of the related space scientific experiment is carried out, so that the ground simulation research device has important scientific value and urgent practical significance for the advance of science and the national important requirements. Because the ground simulation experiment of the interaction between the near-earth space plasma environment and the laser has the advantages of controllable process/parameter, repeatable integral evolution process, simultaneous measurement at multiple points and the like, the method has important significance in understanding the physical process of laser transmission in the near-earth space plasma, improving the capability of human beings to explore the evolution rule of the near-earth space environment and improving the understanding level of the interaction between the near-earth space plasma and the laser.
However, the existing near-earth space plasma research device designed and built at home and abroad can only provide a simple dipole magnetic field configuration and background plasma, and does not have the research function of the interaction of the near-earth space plasma and laser under various working conditions.
Disclosure of Invention
The invention aims to provide a ground simulation research device for interaction of near-earth space plasma and laser, which aims to solve the problem of single research function in the prior art.
In order to solve the technical problem, the invention provides a ground simulation research device for interaction of near-earth space plasma and laser, which comprises a vacuum pump, a vacuum cavity, an electromagnetic wave emission mechanism, a tunable laser and a detector, wherein the vacuum pump is connected with the vacuum cavity; the vacuum pump is communicated with the inside of the vacuum cavity and is used for adjusting the vacuum degree in the vacuum cavity; the plasma generator is characterized in that an excitation coil and a plasma generating mechanism are arranged in the vacuum cavity, the excitation coil and the plasma generating mechanism are arranged oppositely in the vertical direction, the excitation coil is used for generating a magnetic field with adjustable strength, and the plasma generating mechanism is used for generating plasma and conveying the plasma into the magnetic field; a quartz window is arranged on the side wall of the vacuum cavity and is opposite to the magnetic field; the electromagnetic wave emission mechanism is arranged outside the vacuum cavity, has the functions of adjusting frequency and power, is arranged opposite to the quartz window and is used for sending electromagnetic waves to the magnetic field through the quartz window; the tunable laser is of an irradiation angle adjustable structure, the detector is of a receiving angle adjustable structure, the tunable laser and the detector are both arranged in the vacuum cavity, the tunable laser and the detector are respectively arranged outside two opposite sides of the magnetic field, and the tunable laser is used for sending laser to pass through the magnetic field and the plasma and then to be sent to the detector.
In one embodiment, a first support frame and a second support frame are arranged in the vacuum cavity; the tunable laser is in rotary connection with the first support frame, and the rotation of the tunable laser is used for adjusting the irradiation angle of the magnetic field; the detector is rotatably connected with the second support frame, and the rotation of the detector is used for adjusting the irradiation angle of the magnetic field.
In one embodiment, the vacuum pump is used for controlling the working vacuum degree in the vacuum cavity to be 10-1～10-2Pa and an ultimate degree of vacuum of 10-5Pa。
In one embodiment, the excitation coil is used for generating the magnetic field with the central intensity of 1-2T and the target area intensity of 100-1000 Gs.
In one embodiment, the plasma generating mechanism includes a cathode electron emission source and an anode grid, and the cathode electron emission source, the anode grid and the excitation coil are sequentially arranged in an upward direction from below.
In one embodiment, the plasma generating mechanism is used to generate a density of 109～1010cm-3And the temperature of the plasma is 1-80 eV.
In one embodiment, the electromagnetic wave emitting mechanism comprises an antenna power supply and an electron cyclotron resonance antenna, the antenna power supply is in power supply connection with the electron cyclotron resonance antenna, and the electron cyclotron resonance antenna is arranged opposite to the quartz window.
In one embodiment, the frequency of the electron cyclotron resonance antenna is adjusted within a range of 1 to 20GHz, and the power of the electron cyclotron resonance antenna is adjusted within a range of 1 to 50 kW.
In one embodiment, the surface of the excitation coil is covered with an insulating coating.
The invention has the following beneficial effects:
1. the excitation coil is used for generating a magnetic field with adjustable strength, so that the excitation coil can be used for simulating the earth magnetic field in the near-earth space and has high similarity with the earth dipole magnetic field in the near-earth space in terms of magnetic topology;
2. because the electromagnetic wave transmitting mechanism has the functions of adjusting frequency and power, the simulated near-earth space plasma which can be adjusted in a certain range can be obtained;
3. the tunable laser is used as a laser beam generating device to obtain a laser beam which can continuously change the output wavelength within a certain range, and the laser beam passes through the plasma to generate the change of physical information such as phase, wave front and the like, so that the tunable laser is used for ground experiment simulation research under different conditions;
4. the tunable laser is of an irradiation angle adjustable structure, and the detector is of a receiving angle adjustable structure, so that the transmission characteristics of laser beams in simulated near-earth space plasma under different transmission paths can be obtained by changing the spatial positions of the tunable laser and the detector, and the method is used for researching the influence rule of the transmission paths on the interaction of the laser and the near-earth space plasma;
5. because the vacuum pump is used for adjusting the vacuum degree in the vacuum cavity, according to the similarity calibration relation of space-ground experiments, by changing the parameters such as background gas pressure, gas components and the like in the vacuum cavity, the influence rule of the parameters such as gas pressure and gas components on the interaction of the laser and the near-ground space plasma can be researched.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram provided by an embodiment of a ground simulation research device for interaction between near-earth space plasma and laser according to the present invention.
The reference numbers are as follows:
10. a vacuum pump;
20. a vacuum chamber; 21. a field coil; 22. a plasma generating mechanism; 221. a cathode electron emission source; 222. an anode grid; 223. plasma; 23. a magnetic field; 24. a quartz window; 251. a first support frame; 252. a second support frame;
30. an electromagnetic wave emitting mechanism; 31. an antenna power supply; 32. an electron cyclotron resonance antenna;
40. a tunable laser;
50. and a detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the invention provides a ground simulation research device for interaction of near-earth space plasma and laser, and an embodiment of the ground simulation research device is shown in fig. 1, and comprises a vacuum pump 10, a vacuum cavity 20, an electromagnetic wave emission mechanism 30, a tunable laser 40 and a detector 50; the vacuum pump 10 is connected and communicated with the inside of the vacuum cavity 20, and the vacuum pump 10 is used for adjusting the vacuum degree in the vacuum cavity 20; an excitation coil 21 and a plasma generating mechanism 22 are arranged in the vacuum cavity 20, the excitation coil 21 and the plasma generating mechanism 22 are arranged in a vertical direction in a relative mode, the excitation coil 21 is used for generating a magnetic field 23 with adjustable strength, and the plasma generating mechanism 22 is used for generating plasma 223 and conveying the plasma 223 into the magnetic field 23; a quartz window 24 is arranged on the side wall of the vacuum cavity 20, and the position of the quartz window 24 is opposite to that of the magnetic field 23; the electromagnetic wave emitting mechanism 30 is arranged outside the vacuum cavity 20, the electromagnetic wave emitting mechanism 30 has the function of adjusting frequency and power, the electromagnetic wave emitting mechanism 30 is arranged opposite to the quartz window 24, and the electromagnetic wave emitting mechanism 30 is used for sending electromagnetic waves to the magnetic field 23 through the quartz window 24; the tunable laser 40 is of an irradiation angle adjustable structure, the detector 50 is of a receiving angle adjustable structure, the tunable laser 40 and the detector 50 are both arranged in the vacuum cavity 20, the tunable laser 40 and the detector 50 are respectively arranged outside two opposite sides of the magnetic field 23, and the tunable laser 40 is used for sending laser to pass through the magnetic field 23 and the plasma 223 and then to the detector 50.
During working, key parameters such as the intensity of the magnetic field 23, the density of the plasma 223, the laser wavelength and the like are determined according to the similarity calibration relation between the space and a ground experiment, and then the excitation coil 21 is electrified to generate the simulated near-earth space earth magnetic field configuration with the size of the magnetic field 23 meeting the experiment requirement. Then, the electromagnetic wave emitting mechanism 30 is turned on to emit the electromagnetic wave into the magnetic field 23 through the quartz window 24, and the density of the plasma 223 generated in the magnetic field 23 and simulating the near-earth space is adjusted. Thereafter, the configuration parameters of the tunable laser 40 are set, the spatial positions of the tunable laser 40 and the detector 50 are adjusted, and the tunable laser 40 is turned on to obtain a laser beam with a wavelength meeting the experimental requirements and to pass through the target plasma 223 region. The detector 50 is adopted to receive the laser beam, and the result is analyzed, so that the research rule of the interaction between the near-earth space plasma 223 and the laser is obtained.
In summary, the scheme has at least the following advantages:
1. the excitation coil 21 can be used for simulating the earth magnetic field in the near-earth space, and has high similarity with the earth dipole magnetic field in the near-earth space in magnetic topology;
2. a simulated near-earth spatial plasma 223 that is adjustable over a range can be obtained;
3. the tunable laser 40 is used as a laser beam generating device to obtain a laser beam which can continuously change the output wavelength within a certain range, and the laser beam passes through the plasma 223 to generate the change of physical information such as phase, wave front and the like, so that the tunable laser is used for ground experiment simulation research under different conditions;
4. by changing the spatial positions of the tunable laser 40 and the detector 50, the transmission characteristics of the laser beam in the simulated near-earth space plasma 223 under different transmission paths can be obtained, and the method is used for researching the influence rule of the transmission paths on the interaction of the laser and the near-earth space plasma 223;
5. according to the similarity calibration relation of the space-ground experiment, by changing the parameters such as the background gas pressure, the gas components and the like in the vacuum cavity, the influence rule of the parameters such as the gas pressure and the gas components on the interaction of the laser and the near-earth space plasma 223 can be researched; the working gas may be hydrogen, helium, argon, or a mixture thereof.
As shown in fig. 1, a first supporting frame 251 and a second supporting frame 252 are disposed in the vacuum chamber 20; the tunable laser 40 is rotatably connected with the first support 251, and the rotation of the tunable laser 40 is used for adjusting the irradiation angle of the magnetic field 23; the detector 50 is rotatably connected with the second support frame 252, and the rotation of the detector 50 is used for adjusting the irradiation angle of the magnetic field 23.
As can be seen from the illustration, at this time, the first supporting frame 251 is disposed at the upper left of the vacuum chamber 20, the right end of the first supporting frame 251 is rotatably connected to the tunable laser 40, the second supporting frame 252 is disposed at the lower right of the vacuum chamber 20, the upper side of the second supporting frame is rotatably connected to the detector 50, and the rotatable connection can be implemented by hinging, rotating shaft connection, or using a universal rotating component, so that during the application process, the simulation of various paths can be implemented by only correspondingly adjusting the rotating angles of the tunable laser 40 and the detector 50.
It is preferable thatThe vacuum pump 10 of this embodiment is used to control the operating vacuum degree of the vacuum chamber 20 to 10-1～10- 2Pa and an ultimate degree of vacuum of 10-5Pa。
After the arrangement mode is adopted, the adjustment of the vacuum degree in a wider range can be realized in the vacuum cavity 20, so that different experimental requirements can be met.
Preferably, the exciting coil 21 of this embodiment is used for generating the magnetic field 23 with the central intensity of 1-2T and the target area intensity of 100-1000 Gs.
After the arrangement mode is adopted, the intensity of the magnetic field 23 can be adjusted in a wider range by the magnetic field 23, so that different experimental requirements can be met.
As shown in fig. 1, the plasma generating mechanism 22 includes a cathode electron emission source 221 and an anode grid 222, and the cathode electron emission source 221, the anode grid 222 and the excitation coil 21 are arranged in this order in the direction from bottom to top.
In application, the cathode electron emission source 221 is heated to emit thermal electrons, the thermal electrons are accelerated by the electric field of the anode grid 222 and enter the magnetic field 23, and then the thermal electrons collide with working gas (such as hydrogen, helium, argon, or a mixture thereof) to ionize and generate plasma 223 moving along magnetic lines.
In this case, the plasma generation mechanism 22 is preferably controlled to generate a density of 109～1010cm-3And a plasma 223 at a temperature of 1-80 eV to meet the requirements of various experimental simulations.
As shown in fig. 1, the electromagnetic wave emitting mechanism 30 includes an antenna power supply 31 and an electron cyclotron resonance antenna 32, the antenna power supply 31 is electrically connected to the electron cyclotron resonance antenna 32, and the electron cyclotron resonance antenna 32 is disposed opposite to the quartz window 24.
When the electromagnetic wave emitting mechanism 30 is used, the electromagnetic wave is injected into the magnetic field 23 through the quartz window 24, the electron cyclotron resonance electromagnetic wave ionizes working gas (hydrogen, helium, argon, or a mixture of the hydrogen and the helium) at the resonance magnetic field 23 to generate the simulated near-earth space plasma 223, and the frequency adjusting range of the electron cyclotron resonance antenna 32 is preferably set to be 1-20 GHz, the power adjusting range of the electron cyclotron resonance antenna 32 is preferably set to be 1-50 kW, and the electron cyclotron resonance antenna is used for generating the plasma 223 density disturbance at different resonance surface positions through electromagnetic disturbance.
Preferably, this embodiment also covers the surface of the exciting coil 21 with an insulating coating to improve the service life of the exciting coil 21, and it is also possible to arrange that each turn of the winding of the exciting coil 21 includes a water cooling channel to avoid the exciting coil 21 being in a high temperature working state for a long time.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A ground simulation research device for the interaction between near-earth space plasma and laser is characterized in that,
the device comprises a vacuum pump, a vacuum cavity, an electromagnetic wave emission mechanism, a tunable laser and a detector;
the vacuum pump is communicated with the inside of the vacuum cavity and is used for adjusting the vacuum degree in the vacuum cavity;
the plasma generator is characterized in that an excitation coil and a plasma generating mechanism are arranged in the vacuum cavity, the excitation coil and the plasma generating mechanism are arranged oppositely in the vertical direction, the excitation coil is used for generating a magnetic field with adjustable strength, and the plasma generating mechanism is used for generating plasma and conveying the plasma into the magnetic field; a quartz window is arranged on the side wall of the vacuum cavity and is opposite to the magnetic field;
the electromagnetic wave emission mechanism is arranged outside the vacuum cavity, has the functions of adjusting frequency and power, is arranged opposite to the quartz window and is used for sending electromagnetic waves to the magnetic field through the quartz window;
the tunable laser is of an irradiation angle adjustable structure, the detector is of a receiving angle adjustable structure, the tunable laser and the detector are both arranged in the vacuum cavity, the tunable laser and the detector are respectively arranged outside two opposite sides of the magnetic field, and the tunable laser is used for sending laser to pass through the magnetic field and the plasma and then to be sent to the detector.
2. The ground simulation research device for near-earth space plasma and laser interaction according to claim 1,
a first support frame and a second support frame are arranged in the vacuum cavity;
the tunable laser is in rotary connection with the first support frame, and the rotation of the tunable laser is used for adjusting the irradiation angle of the magnetic field;
the detector is rotatably connected with the second support frame, and the rotation of the detector is used for adjusting the irradiation angle of the magnetic field.
3. The ground simulation research device of the interaction of near-earth space plasma and laser according to claim 1, wherein the vacuum pump is used for controlling the working vacuum degree in the vacuum cavity to be 10-1～10-2Pa and an ultimate degree of vacuum of 10-5Pa。
4. The ground simulation research device for near-earth space plasma and laser interaction according to claim 1, wherein the excitation coil is used for generating the magnetic field with the central intensity of 1-2T and the target area intensity of 100-1000 Gs.
5. The ground simulation research device for near-earth space plasma and laser interaction according to claim 1, wherein the plasma generation mechanism comprises a cathode electron emission source and an anode grid, and the cathode electron emission source, the anode grid and the excitation coil are arranged in sequence in a direction from bottom to top.
6. The ground simulation research device for near-earth space plasma and laser interaction according to claim 5, wherein the plasma generation mechanism is used for generating the density of 109～1010cm-3And the temperature of the plasma is 1-80 eV.
7. The ground simulation research device for interaction between near-earth space plasma and laser according to claim 1, wherein the electromagnetic wave emitting mechanism comprises an antenna power supply and an electron cyclotron resonance antenna, the antenna power supply is in power connection with the electron cyclotron resonance antenna, and the electron cyclotron resonance antenna is arranged opposite to the quartz window.
8. The ground simulation research device for near-earth space plasma and laser interaction of claim 7, wherein the frequency of the ECR antenna is adjusted within a range of 1-20 GHz, and the power of the ECR antenna is adjusted within a range of 1-50 kW.
9. The ground simulation study device of the interaction of near-earth space plasma and laser according to claim 1, wherein the surface of the exciting coil is covered with an insulating coating.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115988725A (en) * | 2023-02-17 | 2023-04-18 | 哈尔滨工业大学 | Magnet position adjusting mechanism for high-vacuum plasma environment |
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| FR3002720A1 (en) * | 2013-02-27 | 2014-08-29 | Ecole Polytech | DEVICE FOR MAGNETIZATION OF LASER PLASMA BY MAGNETIC FIELD PULSE |
| CN107091854A (en) * | 2017-03-20 | 2017-08-25 | 中国科学院上海光学精密机械研究所 | Simulate experimental provision and its control method that femtosecond laser interacts with cirrocumulus |
| CN111800934A (en) * | 2020-07-04 | 2020-10-20 | 郑州航空工业管理学院 | Method for improving quality of proton beam in interaction of laser and target |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1274079A (en) * | 2000-06-08 | 2000-11-22 | 中国科学院上海光学精密机械研究所 | Diagnosis device for parameters of nuctual action between laser and plasma |
| FR3002720A1 (en) * | 2013-02-27 | 2014-08-29 | Ecole Polytech | DEVICE FOR MAGNETIZATION OF LASER PLASMA BY MAGNETIC FIELD PULSE |
| CN107091854A (en) * | 2017-03-20 | 2017-08-25 | 中国科学院上海光学精密机械研究所 | Simulate experimental provision and its control method that femtosecond laser interacts with cirrocumulus |
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