CN112660430A - Mixed-field neutron radiation environment simulation system and method - Google Patents
Mixed-field neutron radiation environment simulation system and method Download PDFInfo
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Abstract
The invention discloses a mixed field neutron radiation environment simulation system and method, relates to the technical field of space environment space-ground equivalence tests and simulations, and aims to solve the problems that an existing simulation method is high in manufacturing cost and large in difference with an actual near-ground space atmospheric neutron environment. The system comprises: the atmosphere pressure component is used for simulating a low-pressure atmosphere environment in the low-pressure cabin according to a control signal of the environment simulation control computer; the emission port of the neutron source is communicated with the low-pressure cabin and is used for emitting neutron beam current to the low-pressure cabin according to a control signal of the environment simulation control computer and generating mixed-field neutron radiation in the low-pressure cabin; and the radiation environment monitoring unit is used for detecting neutron radiation information in the low-pressure cabin and feeding the neutron radiation information back to the environment simulation control computer. The system and the method realize the mixed-field neutron radiation environment simulation with low cost, the detection result is closer to the actual near-earth space atmospheric neutron environment, and the practicability is very high.
Description
Technical Field
The invention relates to the technical field of space environment space-ground equivalence test and simulation, in particular to a mixed field neutron radiation environment simulation system and method.
Background
The near-earth space atmospheric neutrons can induce a variety of radiation effects for aircraft electronics, including but not limited to single event effects, displacement damage, and total dose effects, with the single event effect being the predominant. The effect can cause serious consequences such as Single Event Upset (SEU) of a memory in the aircraft, Single Event Burnout (SEB) of a power field effect tube, Single Event Lockout (SEL) of a CMOS device and the like. Cosmic ray particles entering the earth atmosphere react with atmospheric components to generate near-earth space atmospheric neutrons, so that a mixed field neutron radiation environment is caused, and the nuclear reaction is the main reason for inducing single event upset. The development of neutron-induced single event effect experiments is a necessary measure for preventing hazardous consequences and improving the safety and reliability of the aircraft.
The existing experimental approaches mainly comprise two approaches of an actual flight experiment and a ground equivalent simulation experiment, and although the actual flight experiment is more direct and accurate, the experimental cost is too high; the difficulty and the key problem of the ground equivalent simulation experiment are designing and realizing a neutron radiation environment simulation system similar to a neutron radiation environment in a near-earth space atmosphere wide energy band. At present, methods for simulating neutron radiation environments include a hash neutron source, a fission reactor neutron source, an accelerator single-energy neutron source, a radioisotope neutron source, a neutron tube and the like, wherein the hash neutron source can obtain a neutron energy spectrum similar to a near-earth space atmospheric wide-energy-band neutron radiation environment. However, a hash neutron source, a fission reactor neutron source and the like belong to the national-level large scientific engineering, and have the disadvantages of large volume, high manufacturing cost and high use cost; the neutron energy spectrums of an accelerator mono-energy neutron source, a radioactive isotope neutron source, a neutron tube and the like are single, and the difference with the practical near-earth space atmospheric neutron environment is large.
Disclosure of Invention
The invention aims to provide a mixed-field neutron radiation environment simulation system and method, which are used for solving the problems that the conventional neutron radiation environment simulation method is high in manufacturing cost and use cost, a single-energy neutron source of an accelerator, a single-energy radioisotope neutron source, a single neutron tube and the like are single in neutron energy spectrum, and the difference between the neutron energy spectrum and the actual near-earth space atmospheric neutron environment is large.
In order to achieve the above purpose, the invention provides the following technical scheme:
a mixed-field neutron radiation environment simulation system is provided, which comprises: the system comprises a neutron source, a low-pressure cabin, an atmosphere pressure component, a radiation environment monitoring unit and an environment simulation control computer;
the atmosphere pressure component is used for simulating a low-pressure atmosphere environment in the low-pressure cabin according to a control signal of the environment simulation control computer;
the emission port of the neutron source is communicated with the low-pressure cabin and is used for emitting neutron beam current to the low-pressure cabin according to the control signal of the environment simulation control computer and generating mixed field neutron radiation in the low-pressure cabin;
and the radiation environment monitoring unit is used for detecting neutron radiation information in the low-pressure cabin and feeding back the neutron radiation information to the environment simulation control computer.
Compared with the prior art, the mixed field neutron radiation environment simulation system provided by the invention can realize mixed field neutron radiation environment simulation with relatively low construction and use cost under a laboratory environment with limited floor area, and develop a ground equivalent simulation test of a near-earth space atmospheric wide-energy-band neutron radiation environment. Overall structure is simple, and experimental control is more convenient, and it is also easier to test, and the testing result is also close actual near ground space atmospheric neutron environment more, has very high practicality.
The invention also provides a simulation method based on the mixed-field neutron radiation environment simulation system, which comprises the following steps:
the atmosphere pressure component simulates a low-pressure atmosphere environment in the low-pressure cabin according to a control signal of the environment simulation control computer;
the neutron source emits neutron beam current to the low-pressure cabin according to the control signal of the environment simulation control computer, and mixed field neutron radiation is generated in the low-pressure cabin;
and the radiation environment monitoring unit is used for detecting neutron radiation information in the low-pressure cabin and feeding back the neutron radiation information to the environment simulation control computer.
Compared with the prior art, the beneficial effects of the mixed-field neutron radiation environment simulation method provided by the invention are the same as the beneficial effects of the mixed-field neutron radiation environment simulation system based on the technical scheme, and the details are not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic block diagram of a mixed-field neutron radiation environment simulation system in an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a mixed-field neutron radiation environment simulation system according to an embodiment of the present invention.
Reference numerals:
the system comprises a neutron source 1, a low-pressure cabin 2, a radiation shielding layer 3, a vacuum pump 4, an atmospheric gas source 5, an atmospheric pressure control unit 6, an atmospheric pressure monitoring unit 7, a radiation environment monitoring unit 8 and an environment simulation control computer 9.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the simulation system for neutron radiation environment in mixed field provided by the present invention includes: the system comprises a neutron source 1, a low-pressure cabin 2, an atmosphere pressure component, a radiation environment monitoring unit 8 and an environment simulation control computer 9;
an atmosphere pressure component for simulating a low-pressure atmosphere environment in the low-pressure chamber 2 according to a control signal of the environment simulation control computer 9;
the emission port of the neutron source 1 is communicated with the low-pressure chamber 2 and is used for emitting neutron beam current into the low-pressure chamber 2 according to a control signal of the environment simulation control computer 9 and generating mixed field neutron radiation in the low-pressure chamber 2;
and the radiation environment monitoring unit 8 is used for detecting neutron radiation information in the low-pressure cabin 2 and feeding the neutron radiation information back to the environment simulation control computer 9.
In the specific implementation:
the environment simulation control computer 9 is used for controlling the neutron beam with set energy and flow intensity generated by the neutron source 1 according to the test requirements, irradiating the rarefied atmosphere in the low-pressure cabin 2 to generate mixed-field neutron radiation, receiving the information of the atmosphere pressure monitoring unit 7 and the radiation environment monitoring unit 8, controlling the atmosphere pressure control unit 6, coordinating and controlling the vacuum pump 4 and the atmosphere gas source 5, maintaining the atmosphere environment in the low-pressure cabin 2 according to the test requirements, and providing a mixed-field neutron radiation environment.
The neutron source 1 is adopted, including but not limited to a deuterium-tritium neutron tube and the like, and neutron radiation environment simulation is achieved at relatively low construction and use cost under a laboratory environment with limited floor space.
Compared with the prior art, the mixed field neutron radiation environment simulation system provided by the invention can realize mixed field neutron radiation environment simulation with relatively low construction and use cost under a laboratory environment with limited floor area, and develop a ground equivalent simulation test of a near-earth space atmospheric wide-energy-band neutron radiation environment. Overall structure is simple, and experimental control is more convenient, and it is also easier to test, and the testing result is also close actual near ground space atmospheric neutron environment more, has very high practicality.
As an implementable embodiment, the atmosphere pressure assembly includes a vacuum pump 4, an atmosphere gas source 5, and an atmosphere pressure control unit 6;
the vacuum pump 4 is communicated with the low-pressure cabin 2 through the atmosphere pressure control unit 6 and is used for extracting air in the low-pressure cabin 2 to create a low-pressure environment;
the atmosphere gas source 5 is communicated with the low-pressure cabin 2 through the atmosphere pressure control unit 6 and is used for providing a rarefied atmosphere environment atmosphere for the low-pressure cabin 2 and simulating a low-pressure atmosphere environment;
the atmosphere pressure control unit 6 is communicated with the low-pressure chamber 2 and is used for coordinating and controlling the vacuum pump 4 and the atmosphere source 5 and maintaining the low-pressure atmosphere environment in the low-pressure chamber 2.
Further, the vacuum pump 4 and the atmosphere gas source 5 are communicated with the atmosphere pressure control unit 6 through pipelines; the atmosphere pressure control unit 6 is communicated with the low-pressure chamber 2 through a cavity flange and a pipeline.
The vacuum pump 4 can provide a vacuum environment for the low-pressure cabin 2, and the atmospheric atmosphere source 5 can provide rarefied atmospheric environment atmosphere for the low-pressure cabin 2, so that atmospheric atmosphere environment simulation in a low-pressure state is realized. The vacuum pump 4 and the atmosphere gas source 5 are respectively connected with an atmosphere pressure control unit 6 through vent pipes. For example, the vacuum pump 4 and the atmospheric gas source 5 are respectively connected with the atmospheric pressure control unit 6 through a first vent pipe and a second vent pipe, and the atmospheric pressure control unit 6 is fixedly connected with the low-pressure chamber 2 through a second chamber flange and a third vent pipe. The vacuum pump 4 and the atmospheric gas source 5 are adopted to simulate the low-pressure atmospheric environment, so that the cost is lower, and the operation is simpler.
As an implementation manner, the atmosphere pressure assembly further includes an atmosphere pressure monitoring unit 7, configured to detect gas components and pressure information in the low pressure chamber 2, and send the detected information to the environment simulation control computer 9, where the environment simulation control computer 9 sends a control signal to the atmosphere pressure control unit 6 according to the detected information.
Through the detection of the gas composition and the air pressure information in the low-pressure cabin 2 by the atmosphere air pressure monitoring unit 7, the state of the low-pressure atmosphere environment in the current low-pressure cabin 2 can be better determined, and the environment in the low-pressure cabin 2 can be conveniently adjusted. The atmosphere pressure monitoring unit 7 is connected with the low-pressure chamber 2 through a data line. For example, the atmosphere pressure monitoring unit 7 and the low-pressure chamber 2 are fixed by a third chamber flange, and feed back the detected information to the environmental simulation control computer 9 in real time through a data line and the environmental simulation control computer 9.
As an implementation mode, the radiation environment monitoring unit 8, the neutron source 1, the atmosphere pressure control unit 6 and the atmosphere pressure monitoring unit 7 are all communicated with the environment simulation control computer 9 through data lines.
The environment simulation control computer 9 can receive the gas composition and the air pressure information in the low-pressure chamber 2 in real time, and adjust the low-pressure atmosphere environment of the low-pressure chamber 2 according to the gas composition and the air pressure information. And the environment simulation control computer 9 is used for providing control signals for the neutron source 1 and the atmosphere pressure control unit 6 according to test requirements, receiving information of the atmosphere pressure monitoring unit 7 and the radiation environment monitoring unit 8, and forming system control loop closure.
As an implementation, the simulation system further includes a radiation shielding layer 3 disposed outside the low-pressure chamber 2 to provide radiation shielding for the low-pressure chamber 2.
The radiation shielding layer 3 is arranged, so that shielding can be better provided for the mixed field seed radiation in the low-pressure chamber 2, and the safety of an experimental environment is ensured.
Specifically, the mixed-field neutron radiation environment simulation system has the following specific functions: the neutron source 1 is used for generating neutron beam current and irradiating the rarefied atmosphere in the low-pressure cabin 2 to generate mixed-field neutron radiation; the low-pressure chamber 2 is used for providing an environment simulating low-pressure atmospheric atmosphere of a near-earth space; the radiation shielding layer 3 is used for shielding neutron radiation in a mixed field; the vacuum pump 4 is used for pumping the gas in the low-pressure cabin 2 and reducing the pressure; the atmosphere gas source 5 is used for providing a rarefied atmosphere environment atmosphere for the low-pressure cabin 2; the atmosphere pressure control unit 6 is used for coordinately controlling the vacuum pump 4 and the atmosphere gas source 5 and maintaining the atmosphere environment atmosphere in the low-pressure chamber 2 according to the test requirements; the atmosphere and pressure monitoring unit 7 is used for feeding back the gas composition and the gas pressure information in the low-pressure chamber 2 to the environment simulation control computer 9; the radiation environment monitoring unit 8 is used for feeding back neutron radiation information to the environment simulation control computer 9; and the environment simulation control computer 9 is used for providing control signals for the neutron source 1 and the atmosphere pressure control unit 6 according to test requirements, receiving information of the atmosphere pressure monitoring unit 7 and the radiation environment monitoring unit 8, and forming system control loop closure.
Specifically, the environment simulation control computer 9 is configured to control, according to a test requirement, a neutron beam with set energy and flow intensity generated by the neutron source 1 to irradiate a lean atmosphere in the low-pressure cabin 2 to generate mixed-field neutron radiation, receive information from the atmosphere pressure monitoring unit 7 and the radiation environment monitoring unit 8, control the atmosphere pressure control unit 6, coordinate and control the vacuum pump 4 and the atmosphere gas source 5, maintain an atmosphere environment in the low-pressure cabin 2 according to the test requirement, and provide a mixed-field neutron radiation environment.
As shown in fig. 2, the present invention further provides a mixed-field neutron radiation environment simulation method, which is applied to a mixed-field neutron radiation environment simulation system, and includes the following steps:
step S10: the atmosphere pressure component simulates a low-pressure atmosphere environment in the low-pressure cabin according to a control signal of the environment simulation control computer;
step S20: the neutron source emits neutron beam current to the low-pressure cabin according to the control signal of the environment simulation control computer, and mixed field neutron radiation is generated in the low-pressure cabin;
step S30: and the radiation environment monitoring unit is used for detecting neutron radiation information in the low-pressure cabin and feeding the neutron radiation information back to the environment simulation control computer.
Compared with the prior art, the mixed field neutron radiation environment simulation system provided by the invention can realize mixed field neutron radiation environment simulation with relatively low construction and use cost under a laboratory environment with limited floor area, and develop a ground equivalent simulation test of a near-earth space atmospheric wide-energy-band neutron radiation environment. Overall structure is simple, and experimental control is more convenient, and it is also easier to test, and the testing result is also close actual near ground space atmospheric neutron environment more, has very high practicality.
As an implementation manner, the method for simulating the low-pressure atmosphere environment in the low-pressure chamber according to the control signal of the environment simulation control computer comprises the following steps:
the vacuum pump is communicated with the low-pressure cabin through the atmosphere pressure control unit, and is used for extracting air in the low-pressure cabin to create a low-pressure environment;
the atmosphere gas source is communicated with the low-pressure cabin through the atmosphere pressure control unit, and is used for providing a rarefied atmosphere environment atmosphere for the low-pressure cabin and simulating a low-pressure atmosphere environment;
the atmosphere pressure control unit is communicated with the low-pressure cabin, coordinates and controls the vacuum pump and the atmosphere gas source, and maintains the low-pressure atmosphere environment in the low-pressure cabin.
The vacuum pump can provide vacuum environment for the low-pressure cabin, and the atmosphere gas source can provide rarefied atmosphere environment atmosphere for the low-pressure cabin, so that the atmosphere environment simulation in the low-pressure state is realized. The vacuum pump and the atmosphere gas source are respectively connected with the atmosphere pressure control unit through a ventilation pipeline. For example, the vacuum pump and the atmosphere gas source are respectively connected with the atmosphere pressure control unit through a first vent pipeline and a second vent pipeline, and the atmosphere pressure control unit is fixedly connected with the low-pressure cabin through a second cabin-passing flange and a third vent pipeline. The vacuum pump and the atmospheric gas source are adopted to simulate the low-pressure atmospheric environment, so that the cost is lower, and the operation is simpler.
As an implementation manner, the method for simulating the low-pressure atmosphere environment in the low-pressure chamber according to the control signal of the environment simulation control computer further comprises the following steps:
the atmosphere pressure monitoring unit detects gas components and pressure information in the low-pressure cabin, the detected information is sent to the environment simulation control computer, and the environment simulation control computer sends a control signal to the atmosphere pressure control unit according to the detected information.
Through the detection of the gas composition and the air pressure information in the low-pressure cabin by the atmosphere air pressure monitoring unit, the state of the low-pressure atmosphere environment in the current low-pressure cabin can be better determined, and the environment in the low-pressure cabin can be conveniently adjusted. The atmosphere pressure monitoring unit is connected with the low-pressure cabin through a data line. For example, the atmosphere pressure monitoring unit and the low-pressure chamber are fixed through a third chamber flange, and the detected information is fed back to the environment simulation control computer in real time through the data line and the environment simulation control computer.
The simulation method of the neutron radiation environment in the mixed field comprises two processes:
the neutron source is adopted, including but not limited to a deuterium-tritium neutron tube and the like, and neutron beam output is realized in a laboratory environment with limited floor area.
And the low-pressure chamber is adopted for providing an environment for simulating a low-pressure atmospheric atmosphere in an adjacent space, and a mixed-field neutron radiation environment is generated by irradiating a rarefied atmospheric atmosphere with neutron beams, so that the mixed neutron radiation environment simulation is realized with relatively low construction and use costs.
Specifically, an environment simulation control computer controls neutron beam current with set energy and flow intensity generated by a neutron source according to test requirements, irradiates rarefied atmosphere in a low-pressure cabin to generate mixed-field neutron radiation, receives information of an atmosphere pressure monitoring unit and a radiation environment monitoring unit, controls an atmosphere pressure control unit, coordinately controls a vacuum pump and an atmosphere gas source, maintains atmosphere environment atmosphere in the low-pressure cabin according to the test requirements, and provides a mixed-field neutron radiation environment.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A mixed-field neutron radiation environment simulation system, comprising: the system comprises a neutron source, a low-pressure cabin, an atmosphere pressure component, a radiation environment monitoring unit and an environment simulation control computer;
the atmosphere pressure component is used for simulating a low-pressure atmosphere environment in the low-pressure cabin according to a control signal of the environment simulation control computer;
the emission port of the neutron source is communicated with the low-pressure cabin and is used for emitting neutron beam current to the low-pressure cabin according to the control signal of the environment simulation control computer and generating mixed field neutron radiation in the low-pressure cabin;
and the radiation environment monitoring unit is used for detecting neutron radiation information in the low-pressure cabin and feeding back the neutron radiation information to the environment simulation control computer.
2. The mixed-field neutron radiation environment simulation system of claim 1, wherein the atmospheric pressure assembly comprises a vacuum pump, an atmospheric gas source, and an atmospheric pressure control unit;
the vacuum pump is communicated with the low-pressure cabin through the atmosphere pressure control unit and is used for extracting air in the low-pressure cabin to create a low-pressure environment;
the atmosphere gas source is communicated with the low-pressure cabin through the atmosphere pressure control unit and is used for providing a rarefied atmosphere environment atmosphere for the low-pressure cabin and simulating a low-pressure atmosphere environment;
and the atmosphere pressure control unit is communicated with the low-pressure cabin and is used for coordinating and controlling the vacuum pump and the atmosphere gas source and maintaining the low-pressure atmosphere environment in the low-pressure cabin.
3. The mixed-field neutron radiation environment simulation system according to claim 2, wherein the atmosphere pressure assembly further comprises an atmosphere pressure monitoring unit for detecting gas components and pressure information in the low-pressure chamber and sending the detected information to the environment simulation control computer, and the environment simulation control computer sends a control signal to the atmosphere pressure control unit according to the detected information.
4. The mixed-field neutron radiation environment simulation system of claim 2, wherein the vacuum pump and the atmospheric gas source are in communication with the atmospheric pressure control unit through a pipeline.
5. The mixed-field neutron radiation environment simulation system of claim 2, wherein the atmosphere pressure control unit is in communication with the low-pressure chamber through a chamber flange and a pipe.
6. The mixed-field neutron radiation environment simulation system of claim 3, wherein the radiation environment monitoring unit, the neutron source, the atmosphere pressure control unit and the atmosphere pressure monitoring unit are all in communication with the environment simulation control computer through data lines.
7. The mixed-field neutron radiation environment simulation system of claim 1, further comprising a radiation shielding layer disposed outside the low-pressure chamber to provide radiation shielding for the low-pressure chamber.
8. A simulation method based on the mixed-field neutron radiation environment simulation system of any one of claims 1 to 7 is characterized by comprising the following steps:
the atmosphere pressure component simulates a low-pressure atmosphere environment in the low-pressure cabin according to a control signal of the environment simulation control computer;
the neutron source emits neutron beam current to the low-pressure cabin according to the control signal of the environment simulation control computer, and mixed field neutron radiation is generated in the low-pressure cabin;
and the radiation environment monitoring unit is used for detecting neutron radiation information in the low-pressure cabin and feeding back the neutron radiation information to the environment simulation control computer.
9. The simulation method of claim 8, wherein the atmospheric pressure component simulates a low-pressure atmospheric environment in the low-pressure cabin according to the control signal of the environment simulation control computer, comprising the steps of:
the vacuum pump is communicated with the low-pressure cabin through an atmosphere pressure control unit, and is used for extracting air in the low-pressure cabin to create a low-pressure environment;
an atmospheric atmosphere source is communicated with the low-pressure cabin through the atmosphere pressure control unit, and is used for providing a rarefied atmospheric environment atmosphere for the low-pressure cabin and simulating a low-pressure atmospheric environment;
the atmosphere pressure control unit is communicated with the low-pressure cabin, and coordinates and controls the vacuum pump and the atmosphere gas source to maintain the low-pressure atmosphere environment in the low-pressure cabin.
10. The simulation method of claim 9, wherein the atmospheric pressure component simulates a low-pressure atmospheric environment within the low-pressure cabin according to the control signal of the environment simulation control computer, further comprising the steps of:
the atmosphere pressure monitoring unit detects gas components and pressure information in the low-pressure cabin, the detected information is sent to the environment simulation control computer, and the environment simulation control computer sends a control signal to the atmosphere pressure control unit according to the detected information.
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