CN107993916B - Large-scale uniform plasma environment simulation system and simulation method thereof - Google Patents
Large-scale uniform plasma environment simulation system and simulation method thereof Download PDFInfo
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Abstract
The invention relates to a large-scale uniform plasma simulation system and a simulation method thereof, belonging to the field of space environment simulation and space environment detection. In the large-scale uniform plasma environment simulation system, the transitional source cabin can be adopted to ensure that the plasma enters the real spaceThe plasma of the inspection chamber is more uniform; helmholtz (Helmholtz) current-carrying coils are adopted, so that charged particles in plasmas in a source chamber and an experimental chamber of the large-scale plasma environment simulation system are effectively weakened or eliminated
Drift effect; the plasma output end plate with a special structure is adopted, so that the radial uniformity of plasma distribution in the source chamber and the experiment chamber is effectively improved, and the axial gradient is reduced. The large-scale uniform plasma environment simulation method can realize that the radial nonuniformity of the plasma density distribution in the large-scale simulation experiment cabin is less than 10 percent (within the range of phi 500mm scale), and the axial nonuniformity is less than 10 percent (within the range of phi 500mm scale).
Description
Technical Field
The invention relates to a large-scale uniform plasma simulation system and a simulation method thereof, belonging to the field of space environment simulation and space environment detection.
Background
The space plasma environment simulation test technology is not only used for researching space physics, space weather science, space environment and the like, but also is a basic method means for researching interaction of the spacecraft and materials thereof with the space plasma. Particularly, for space environment detection type payloads (Langmuir probes, plasma analyzers, electric field detectors, surface potential analyzers and the like), in order to correctly and effectively verify, test and evaluate the working principle, the operation mode, the function, the performance and the like of the payloads through experiments, a large-scale uniform plasma environment needs to be established on the ground so as to objectively and truly simulate the environment conditions of the spacecraft and the load flight orbit plasma.
Disclosure of Invention
Based on a space plasma environment ground simulation test technology and according to a space environment detection type effective load working principle and functional performance requirements, the invention aims to provide a large-scale uniform plasma environment simulation system and a simulation method thereof, which are used for simulating the plasma environment of a spacecraft and a load flight orbit.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a large-scale uniform plasma environmental simulation system, the system comprising: the device comprises a plasma source, a plasma output end plate, an experiment chamber horizontal Helmholtz current-carrying coil and an experiment chamber vertical Helmholtz current-carrying coil; the plasma source and the experiment chamber are respectively connected to two ends of the plasma output end plate in an equiaxial manner, the center of a horizontal Helmholtz current-carrying coil of the experiment chamber and the center of the experiment chamber are in the same vertical direction, and the experiment chamber is vertical to the center of the Helmholtz current-carrying coil and is positioned on the axis of the experiment chamber; the number of horizontal Helmholtz current-carrying coils of the experiment chamber is 2, the number of vertical Helmholtz current-carrying coils of the experiment chamber is at least 4, and a vacuum air extractor, a plasma diagnosis device and a magnetic field measuring device are arranged in the experiment chamber.
Furthermore, the system also comprises a source chamber, a source chamber horizontal Helmholtz current-carrying coil and a source chamber vertical Helmholtz current-carrying coil, wherein the source chamber is equiaxed and connected between the plasma output end plate and the experiment chamber; the center of a horizontal Helmholtz current-carrying coil of the source cabin and the center of the source cabin are in the same vertical direction, and the source cabin is vertical to the Helmholtz current-carrying coil and the center of the Helmholtz current-carrying coil is on the axis of the source cabin; the number of horizontal Helmholtz current-carrying coils of the source cabin is 2, and the number of vertical Helmholtz current-carrying coils of the source cabin is at least 2; the source cabin is internally provided with a vacuum air extractor, a plasma diagnosis device and a magnetic field measuring device.
Furthermore, the experiment cabin is made of nonmagnetic stainless steel, the effective diameter is larger than 1500mm, and the effective length is larger than 3000 mm.
Further, the gas in the experimental chamber is argon.
Further, the standard deviation of the plasma density or the electron temperature in the experimental chamber within the time scale of 2h is less than 2%.
Furthermore, the plasma output end plate is of a circular ring structure, and the end face of the plasma output end plate is provided with arc through grooves which are uniformly distributed in the circumferential direction and are radially distributed in a fan shape.
Furthermore, 12 groups of arc-shaped through grooves are uniformly formed in the plasma output end plate, each group of arc-shaped through grooves comprises 10 sections of concentric arcs, and each section of concentric arc is radially distributed in a sector shape with an opening angle of 25 degrees; the diameter that interior circular arc led to the groove is 180mm, and the diameter that outer circular arc led to the groove is 360mm, and each arc leads to the radial interval of groove and is 20 mm.
Furthermore, the source cabin adopts no magnetism stainless steel material, and effective diameter is greater than 500mm, and effective length is greater than 1000 mm.
A large-scale uniform plasma environment simulation method, comprising the steps of:
(1) placing the large-scale uniform plasma environment simulation system along the horizontal projection direction of the geomagnetic field;
(2) applying current to a horizontal Helmholtz current-carrying coil of the experiment chamber and a vertical Helmholtz current-carrying coil of the experiment chamber, and stopping applying the current after acquiring current parameters corresponding to demagnetization of the experiment chamber when the intensity of a residual magnetic field in a scale range of central local area phi 500mm multiplied by 2000mm in the experiment chamber is less than 500nT and the nonuniformity is less than 10%; wherein, the residual magnetic field intensity and the inhomogeneity are obtained by testing a magnetic field measuring device;
(3) starting a vacuum pumping device, and vacuumizing to ensure that the background vacuum degree in the experiment cabin is better than 5 multiplied by 10-5Pa magnitude;
(4) starting a plasma source, and adjusting plasma parameters in an experiment cabin as follows: ion density neIn the range of 5X 109～5×1012ele./m3Temperature T of ioneIn the range of 500 to 5000K, and a static ion temperature TiThe range of (1) is 500-5000K, and the drift state argon ion energy kTiIs 12eV, where k is Boltzmann constant; wherein, the plasma parameters are obtained by testing the plasma diagnostic device;
(5) applying current to the Helmholtz current-carrying coil according to the current parameters obtained in the step (2);
(6) and maintaining the current parameters and the plasma parameters unchanged, and completing the simulation of the large-scale uniform plasma environment.
A large-scale uniform plasma environment simulation method, comprising the steps of:
(1) placing the large-scale uniform plasma environment simulation system along the horizontal projection direction of the geomagnetic field;
(2) applying current to a horizontal Helmholtz current-carrying coil of the experiment chamber, a vertical Helmholtz current-carrying coil of the experiment chamber, a horizontal Helmholtz current-carrying coil of the source chamber and a vertical Helmholtz current-carrying coil of the source chamber, and stopping applying the current after acquiring current parameters corresponding to demagnetization of the experiment chamber and the source chamber when the intensity of a residual magnetic field in a central local phi 500mm multiplied by 2000mm scale range in the experiment chamber is less than 500nT and the nonuniformity is less than 10%, the intensity of the residual magnetic field in a central local phi 150mm multiplied by 500mm scale range in the source chamber is less than 1 muT and the nonuniformity is less than 25%; wherein, the residual magnetic field intensity and the inhomogeneity are obtained by testing a magnetic field measuring device;
(3) starting a vacuum air extractor, and vacuumizing to make the background vacuum degree in the experiment chamber and the source chamber better than 5 multiplied by 10-5Pa magnitude;
(4) starting a plasma source, and adjusting plasma parameters in an experiment cabin as follows: ion density neIn the range of 5X 109～5×1012ele./m3Temperature T of ioneIn the range of 500 to 5000K, and a static ion temperature TiIn the range of 500 to 5000K, drift state argon ionsEnergy kTiIs 12eV, where k is Boltzmann constant; wherein, the plasma parameters are obtained by testing the plasma diagnostic device;
(5) applying current to the Helmholtz current-carrying coil according to the current parameters obtained in the step (2);
(6) and maintaining the current parameters and the plasma parameters unchanged, and completing the simulation of the large-scale uniform plasma environment.
Advantageous effects
(1) In the large-scale uniform plasma environment simulation system, the plasma entering the experiment chamber can be more uniform by adopting the transitional source chamber.
(1) In the large-scale uniform plasma environment simulation system, charged particles in plasmas in the source cabin and the experimental cabin of the large-scale plasma environment simulation system are effectively weakened or eliminated by adopting Helmholtz current-carrying coilsDrift effect.
(2) In the large-scale uniform plasma environment simulation system, the plasma output end plate with a special structural form is adopted, so that the radial uniformity of plasma distribution in the source chamber and the experiment chamber is effectively improved, and the axial gradient is reduced.
(3) The large-scale uniform plasma environment simulation method can realize that the radial nonuniformity of the plasma density distribution in the large-scale simulation experiment cabin is less than 10 percent (within the range of phi 500mm scale), and the axial nonuniformity is less than 10 percent (within the range of phi 500mm scale).
Drawings
FIG. 1 is a schematic diagram of a large-scale uniform plasma environment simulation system according to the present invention.
FIG. 2 is a schematic diagram of a plasma output end plate structure according to the present invention.
The device comprises a 1-plasma source, a 2-plasma output end plate, a 3-source chamber, a 4-large-scale experiment chamber, a 5-experiment chamber horizontal Helmholtz current-carrying coil, a 6-experiment chamber vertical Helmholtz current-carrying coil, a 7-source chamber horizontal Helmholtz current-carrying coil, an 8-source chamber vertical Helmholtz current-carrying coil and a 9-arc through groove.
Detailed Description
A large-scale uniform plasma environment simulation system, as shown in fig. 1, the system comprising: the device comprises a plasma source 1, a plasma output end plate 2, a source chamber 3, an experiment chamber 4, an experiment chamber horizontal Helmholtz current-carrying coil 5, an experiment chamber vertical Helmholtz current-carrying coil 6, a source chamber horizontal Helmholtz current-carrying coil 7 and a source chamber vertical Helmholtz current-carrying coil 8; the plasma source 1 and the source chamber 3 are respectively connected with two ends of the plasma output end plate 2 in an isometric mode, the experiment chamber 4 is connected with the source chamber 3 in an isometric mode, the center of the horizontal Helmholtz current-carrying coil 5 of the experiment chamber and the center of the experiment chamber 4 are in the same vertical direction, and the center of the Helmholtz current-carrying coil 6 vertical to the experiment chamber is on the axis of the experiment chamber 4; the center of the horizontal Helmholtz current-carrying coil 7 of the source cabin and the center of the source cabin 3 are in the same vertical direction, and the center of the vertical Helmholtz current-carrying coil 8 of the source cabin is on the axis of the source cabin 3; the number of horizontal Helmholtz current-carrying coils 5 of experiment chamber is 2, the number of vertical Helmholtz current-carrying coils 6 of experiment chamber is 4, the number of horizontal Helmholtz current-carrying coils 7 of source chamber is 2, the number of vertical Helmholtz current-carrying coils 8 of source chamber is 2, and vacuum air-extracting devices, plasma diagnosis devices (Langmuir probe and prevention potential analyzer) and magnetic field measuring devices (triaxial fluxgate magnetic field measuring instrument) are arranged in the experiment chamber 4 and the source chamber 3.
The gas in the experiment chamber 4 is argon.
The standard deviation of the plasma density or the electron temperature of the plasma source 1 in the experimental chamber is less than 2% within the time scale of 2 h.
The plasma output end plate 2 is of a circular ring structure, 12 groups of arc through grooves 9 are uniformly formed in the end face of the plasma output end plate, each group of arc through grooves 9 comprises 10 sections of concentric arcs, and each section of concentric arc is radially distributed in a sector shape with an opening angle of 25 degrees; the diameter of the inner arc-shaped through groove is 180mm, the diameter of the outer arc-shaped through groove is 360mm, the radial distance between the arc-shaped through grooves is 20mm, and the structural schematic diagram is shown in fig. 2.
A large-scale uniform plasma environment simulation method, comprising the steps of:
(1) placing the large-scale space plasma environment simulation system along the horizontal projection direction of the geomagnetic field;
(2) applying current to a horizontal Helmholtz current-carrying coil of the experiment chamber, a vertical Helmholtz current-carrying coil of the experiment chamber, a horizontal Helmholtz current-carrying coil of the source chamber and a vertical Helmholtz current-carrying coil of the source chamber, and stopping applying the current after current parameters corresponding to demagnetization of the experiment chamber and the source chamber are obtained;
(3) vacuum pumping is carried out, so that the background vacuum degrees in the experiment chamber and the source chamber are both superior to 5 multiplied by 10-5Pa magnitude;
(4) starting a plasma source, and adjusting plasma parameters in the experiment cabin;
(5) applying current to the Helmholtz current-carrying coil according to the current parameters obtained in the step (2); corresponding current is applied to the Helmholtz coil of the experiment cabin and the source cabin to greatly reduce the residual magnetic field intensity in the source cabin and the experiment cabin, so that the charged particles in the plasma are reduced or eliminated
Drift effect, and the distribution uniformity of large-scale plasma space is improved.
According to the plasma and the bipolar diffusion theory thereof, the electric potential distribution of the plasma in the experimental chamber can be expressed by a boltzmann formula as follows:
in the formula, VP-AIs plasma potential V at A point in the experimental chamberP-RIs plasma potential T at R reference point in the experimental chambereIs the plasma electron temperature, e is the electron charge amount, ne-AIs the electron density of the plasma at point a,ne-Ris the plasma electron density at the R reference point.
According to the formula (1), since the plasma density distribution in the experiment chamber objectively has a radial or axial gradient, inevitably, the plasma space potential distribution in the experiment chamber has a corresponding radial or axial gradient, namely, a quasi-static electric field distribution. This can also be verified using the emission probe or langmuir probe test.
The quasi-static electric field of plasma at a certain position in the experiment chamber or the source chamber is set as
Where the residual magnetic field has a magnetic induction intensity of
The charged particles in the plasma will have edges
A direction drift motion. Such drift motion can cause the effects of "agglomeration" or "dishing" of charged particles in the plasma, thereby causing non-uniformity in the spatial distribution of the plasma. In particular, for large-scale plasma environment experiment devices, charged particles
Drift effects can lead to significant plasma spatial distribution non-uniformities, for example plasma electron density non-uniformities even exceeding 100% over the radial dimension 500mm for an experimental chamber with an effective size of 3000mm x 5000 mm. Theoretical and experimental researches show that when the residual magnetic field in the experiment chamber and the source chamber has the magnetic induction intensity
Weakly, charged particles in the plasma
The "crowding" or "dishing" equivalents caused by drift motion should be significantly reduced or even negligible.
(6) And maintaining the current parameters and the plasma parameters unchanged, and completing the simulation of the large-scale uniform plasma environment.
In the step (2), when the residual magnetic field strength in the central local phi 500mm multiplied by 2000mm scale range in the experimental cabin is less than 500nT and the nonuniformity is less than 10%, the residual magnetic field strength in the central local phi 150mm multiplied by 500mm scale range in the source cabin is less than 1 muT and the nonuniformity is less than 25%, the current application is stopped.
In the step (4), the plasma parameters in the test chamber are as follows: ion density ne≈5×109～5×1012ele./m3Temperature T of ioneApproximately equal to 500-5000K, and static ion temperature TiApproximately equal to 500-5000K, and drift state argon ion energy kTi12eV, where k is Boltzmann constant.
The invention includes, but is not limited to, the above embodiments, and any equivalent substitutions or partial modifications made under the spirit and principle of the invention are deemed to be within the scope of the invention.
Claims (8)
1. A large-scale uniform plasma environment simulation method is characterized in that: the method comprises the following steps:
(1) placing the large-scale uniform plasma environment simulation system along the horizontal projection direction of the geomagnetic field;
(2) applying current to a horizontal Helmholtz current-carrying coil of the experiment chamber and a vertical Helmholtz current-carrying coil of the experiment chamber, and stopping applying the current after acquiring current parameters corresponding to demagnetization of the experiment chamber when the intensity of a residual magnetic field in a scale range of central local area phi 500mm multiplied by 2000mm in the experiment chamber is less than 500nT and the nonuniformity is less than 10%; wherein, the residual magnetic field intensity and the inhomogeneity are obtained by testing a magnetic field measuring device;
(3) starting a vacuum pumping device, and vacuumizing to ensure that the background vacuum degree in the experiment cabin is better than 5 multiplied by 10-5Pa magnitude;
(4) starting a plasma source, and adjusting plasma parameters in an experiment cabin as follows: ion density neIn the range of 5X 109～5×1012ele./m3Ions ofTemperature TeIn the range of 500 to 5000K, and a static ion temperature TiThe range of (1) is 500-5000K, and the drift state argon ion energy kTiIs 12eV, where k is Boltzmann constant; wherein, the plasma parameters are obtained by testing the plasma diagnostic device;
(5) applying current to the Helmholtz current-carrying coil according to the current parameters obtained in the step (2);
(6) keeping the current parameter and the plasma parameter unchanged, and completing the simulation of the large-scale uniform plasma environment;
wherein, the large-scale uniform plasma environment simulation system comprises: the device comprises a plasma source (1), a plasma output end plate (2), a source chamber (3), an experiment chamber (4), an experiment chamber horizontal Helmholtz current-carrying coil (5), an experiment chamber vertical Helmholtz current-carrying coil (6), a source chamber horizontal Helmholtz current-carrying coil (7) and a source chamber vertical Helmholtz current-carrying coil (8); the plasma source (1) and the source cabin (3) are respectively connected to two ends of the plasma output end plate (2) in an equiaxial mode, the experiment cabin (4) is connected with the source cabin (3) in an equiaxial mode, the center of the horizontal Helmholtz current-carrying coil (5) of the experiment cabin and the center of the experiment cabin (4) are in the same vertical direction, and the center of the Helmholtz current-carrying coil (6) vertical to the experiment cabin is on the axis of the experiment cabin (4); the number of horizontal Helmholtz current-carrying coils (5) of the experiment chamber is 2, the number of vertical Helmholtz current-carrying coils (6) of the experiment chamber is at least 4, and a vacuum air extractor, a plasma diagnosis device and a magnetic field measuring device are arranged in the experiment chamber (4); the center of the horizontal Helmholtz current-carrying coil (7) of the source cabin and the center of the source cabin (3) are in the same vertical direction, and the center of the vertical Helmholtz current-carrying coil (8) of the source cabin is on the axis of the source cabin (3); the number of the horizontal Helmholtz current-carrying coils (7) of the source cabin is 2, and the number of the vertical Helmholtz current-carrying coils (8) of the source cabin is at least 2; a vacuum air extractor, a plasma diagnosis device and a magnetic field measuring device are arranged in the source cabin (3).
2. A large-scale uniform plasma environment simulation method is characterized in that: the method comprises the following steps:
(1) placing the large-scale uniform plasma environment simulation system along the horizontal projection direction of the geomagnetic field;
(2) applying current to a horizontal Helmholtz current-carrying coil of the experiment chamber, a vertical Helmholtz current-carrying coil of the experiment chamber, a horizontal Helmholtz current-carrying coil of the source chamber and a vertical Helmholtz current-carrying coil of the source chamber, and stopping applying the current after acquiring current parameters corresponding to demagnetization of the experiment chamber and the source chamber when the intensity of a residual magnetic field in a central local phi 500mm multiplied by 2000mm scale range in the experiment chamber is less than 500nT and the nonuniformity is less than 10%, the intensity of the residual magnetic field in a central local phi 150mm multiplied by 500mm scale range in the source chamber is less than 1 muT and the nonuniformity is less than 25%; wherein, the residual magnetic field intensity and the inhomogeneity are obtained by testing a magnetic field measuring device;
(3) starting a vacuum air extractor, and vacuumizing to make the background vacuum degree in the experiment chamber and the source chamber better than 5 multiplied by 10-5Pa magnitude;
(4) starting a plasma source, and adjusting plasma parameters in an experiment cabin as follows: ion density neIn the range of 5X 109～5×1012ele./m3Temperature T of ioneIn the range of 500 to 5000K, and a static ion temperature TiThe range of (1) is 500-5000K, and the drift state argon ion energy kTiIs 12eV, where k is Boltzmann constant; wherein, the plasma parameters are obtained by testing the plasma diagnostic device;
(5) applying current to the Helmholtz current-carrying coil according to the current parameters obtained in the step (2);
(6) keeping the current parameter and the plasma parameter unchanged, and completing the simulation of the large-scale uniform plasma environment;
wherein, the large-scale uniform plasma environment simulation system comprises: the device comprises a plasma source (1), a plasma output end plate (2), a source chamber (3), an experiment chamber (4), an experiment chamber horizontal Helmholtz current-carrying coil (5), an experiment chamber vertical Helmholtz current-carrying coil (6), a source chamber horizontal Helmholtz current-carrying coil (7) and a source chamber vertical Helmholtz current-carrying coil (8); the plasma source (1) and the source cabin (3) are respectively connected to two ends of the plasma output end plate (2) in an equiaxial mode, the experiment cabin (4) is connected with the source cabin (3) in an equiaxial mode, the center of the horizontal Helmholtz current-carrying coil (5) of the experiment cabin and the center of the experiment cabin (4) are in the same vertical direction, and the center of the Helmholtz current-carrying coil (6) vertical to the experiment cabin is on the axis of the experiment cabin (4); the number of horizontal Helmholtz current-carrying coils (5) of the experiment chamber is 2, the number of vertical Helmholtz current-carrying coils (6) of the experiment chamber is at least 4, and a vacuum air extractor, a plasma diagnosis device and a magnetic field measuring device are arranged in the experiment chamber (4); the center of the horizontal Helmholtz current-carrying coil (7) of the source cabin and the center of the source cabin (3) are in the same vertical direction, and the center of the vertical Helmholtz current-carrying coil (8) of the source cabin is on the axis of the source cabin (3); the number of the horizontal Helmholtz current-carrying coils (7) of the source cabin is 2, and the number of the vertical Helmholtz current-carrying coils (8) of the source cabin is at least 2; a vacuum air extractor, a plasma diagnosis device and a magnetic field measuring device are arranged in the source cabin (3).
3. The large-scale uniform plasma environment simulation method of claim 1 or 2, wherein: the experiment chamber (4) is made of nonmagnetic stainless steel, the effective diameter is larger than 1500mm, and the effective length is larger than 3000 mm.
4. The large-scale uniform plasma environment simulation method of claim 1 or 2, wherein: the gas in the experiment chamber (4) is argon.
5. The large-scale uniform plasma environment simulation method of claim 1 or 2, wherein: the standard deviation of the plasma density or the electron temperature in the experimental chamber of the plasma source (1) is less than 2% within the time scale of 2 h.
6. The large-scale uniform plasma environment simulation method of claim 1 or 2, wherein: the plasma output end plate (2) is of a circular ring structure, and the end face of the plasma output end plate is provided with arc through grooves (9) which are uniformly distributed in the circumferential direction and are distributed in a sector shape in the radial direction.
7. The method of claim 6, wherein the plasma environment is modeled by: 12 groups of arc through grooves (9) are uniformly formed in the plasma output end plate (2), each group of arc through grooves (9) comprises 10 sections of concentric arcs, and each section of concentric arc is radially distributed in a fan shape with an opening angle of 25 degrees; the diameter that interior circular arc led to the groove is 180mm, and the diameter that outer circular arc led to the groove is 360mm, and each arc leads to the radial interval of groove and is 20 mm.
8. The large-scale uniform plasma environment simulation method of claim 1 or 2, wherein: the source cabin (3) is made of nonmagnetic stainless steel, the effective diameter is larger than 500mm, and the effective length is larger than 1000 mm.
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