A method and system for simulating space orbit electron radiation environment

Abstract

The present invention provides a method and system for simulating the electron radiation environment in a space orbit. The system comprises a femtosecond laser system, an optical system, a composite target, a magnet, a beam detector, and an electron spectrometer, all connected in sequence. The method for simulating the electron radiation environment in a space orbit using this system includes acquiring target orbit information and obtaining electron energy spectrum information corresponding to the target orbit; while keeping the laser and target II parameters fixed, varying the density and length of target I, collecting information on the energy and number of electron beams generated by target II, and obtaining electron beam energy spectrum information as well as its corresponding electron temperature and electron cutoff energy; when the electron temperature and electron cutoff energy obtained by adjusting the density and length of target I match those of the target orbit, the target orbit electron radiation environment is obtained. The present invention enables ground-based simulation of the electron radiation environment in a space orbit, filling a gap in the field of ground-based simulation of radiation environments in different orbits.

Description

Technical Field

[0001] The present invention relates to the fields of novel particle acceleration technology and space radiation environment technology, and in particular to a method and system for simulating space orbit electron radiation environment. Background Art

[0002] Under the influence of the geomagnetic field, there are a large number of electrons with energies below 10MeV in the Earth's radiation belt. The energy spectrum structure of these electrons after accumulation presents a nearly exponential distribution, which has the characteristics of a wide energy spectrum. At present, the space radiation environment simulation device based on traditional accelerators cannot produce such electron beams. Therefore, there are problems such as equivalence of space radiation simulation, and it is difficult to accurately characterize the radiation effects of space particles. The rapid development of laser accelerators has provided an effective method for the generation of wide energy spectrum electron beams. For example, by using a focused power density of 10 18 -10 20 W / cm 2 It is easier to produce exponentially wide energy spectrum electron beams by bombarding solid targets with ultra-intense lasers.

[0003] At present, most of the research on simulating space electron radiation environment based on laser particle accelerators is achieved by directly bombarding high-density solid targets with lasers. This method has high requirements for laser focusing, and the energy spectrum structure of the generated electron beam is difficult to control, the divergence is large, and high laser energy is required.

[0004] Therefore, there is an urgent need for a new technology of a method and system for simulating the space orbit electron radiation environment. Summary of the Invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a method and system for simulating the space orbit electron radiation environment. Under the condition of fixing the laser parameters, the parameters of the target can be adjusted to obtain an electron beam that adapts to the electron energy spectrum of different orbits in space, filling the gap in the field of space radiation environment simulation on the ground in simulating different orbit radiation environments, and can provide a theoretical analysis model for subsequent experimental work, which has certain guiding significance.

[0006] To achieve the above-mentioned object, the present invention provides a system for simulating the space orbit electron radiation environment, the system comprising a femtosecond laser system, a vacuum chamber, an optical system, a composite target, a focusing magnetic field, a beam detector, and an electron spectrometer;

[0007] The composite target, focusing magnetic field, beam detector and electron spectrometer are all arranged in a vacuum chamber;

[0008] The femtosecond laser system generates a beam of femtosecond laser light, which is modulated by an optical system for transmission and focusing. The modulated femtosecond laser light is injected into a vacuum target chamber to ionize atoms of a composite target into plasma. An accelerated electron beam is formed under the combined action of laser ponderomotive force or surface ponderomotive force acceleration and a J×B heating mechanism. The electron beam passes through a focusing magnetic field and is injected into a beam current monitor to obtain information on the charge and divergence angle of the electrons. The energy spectrum of the electron beam is then obtained by an electron spectrometer, thereby achieving ground-based simulation of electron radiation environments in different orbits in space.

[0009] The composite target is T-shaped, comprising a target I and a target II that are perpendicular to each other, and the incident direction of the femtosecond laser is parallel to the target I.

[0010] Furthermore, the target I is an aerogel target or a carbon nanotube target whose density and length can be adjusted; and the target II is a solid aluminum target or a hydrocarbon target.

[0011] Furthermore, 3D printing technology was used to obtain aerogel targets I with different densities and lengths, and they were combined with solid aluminum target II through an adhesive.

[0012] Furthermore, the electron number density of the target I is 5×10 19 cm -3 ~1.1×10 22 cm -3 , length is 1μm~8μm, width is 0.1μm~1μm;

[0013] The electron number density of target II is 2×10 22 cm -3 ~3×10 23 cm -3 , length is 20μm~200μm, width is 10μm~80μm.

[0014] Furthermore, the beam detector and the electronic spectrometer are both connected to a computer.

[0015] Furthermore, the focusing magnetic field is a magnet.

[0016] Furthermore, the composite target is arranged in a vacuum target chamber to fix the combined target I and target II.

[0017] Furthermore, the normalized intensity of the femtosecond laser is 2.8 to 4.7, corresponding to a peak power of 1×10 19 W / cm 2 ~3×10 19 W / cm 2 , the pulse length is 20fs~80fs, and the focal spot radius is 3μm~8μm.

[0018] The present invention also provides a method for simulating a space orbit electron radiation environment, wherein a system for simulating a space orbit electron radiation environment as described above is used to conduct an experiment, and the method comprises the following steps:

[0019] Acquiring target orbital information to obtain electron energy spectrum information corresponding to the target orbital; the electron energy spectrum information corresponding to the target orbital includes electron temperature and electron cutoff energy;

[0020] Under the condition of fixed laser parameters and target II parameters, the density and length information of target I are changed, the energy and number information of the electron beam generated by target II are collected, and the energy spectrum information of the electron beam and its corresponding electron temperature and electron cutoff energy are obtained;

[0021] When the electron temperature and electron cutoff energy obtained by adjusting the density and length information of target I match the electron energy spectrum information corresponding to the target orbit, the electron radiation environment of the target orbit is obtained.

[0022] Furthermore, the target orbital information is obtained to obtain the electron energy spectrum information corresponding to the target orbital, specifically:

[0023] Obtain the perigee and apogee heights, inclination, and running time of the target orbit, and calculate the electron energy spectrum of the target orbit using the AE8 or AE9 model.

[0024] Directly obtaining the electron cutoff energy of the target orbital according to the electron energy spectrum of the target orbital;

[0025] According to the electron energy spectrum of the target orbit, the electron temperatures of the low energy segment and the high energy segment are calculated respectively.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention determines the electron temperature of a specific energy region of the space orbit electron energy spectrum by fixing the initial laser wavelength, normalized intensity, and laser pulse width, and selects appropriate target parameters to obtain an electron beam that matches it. The electron energy spectrum of the specified orbit is obtained using the AE8 or AE9 model, and the electron temperature is calculated by fitting the electron energy spectrum of the low energy and high energy segments respectively. The combined target used is composed of target I and target II, wherein the density and length of target I are adjustable to adjust the temperature of the generated electron beam; the material of target I is aerogel or carbon nanotube, and its density can be adjusted between 1n c The electron energy spectra generated by targets with different parameters are statistically analyzed to obtain electron temperatures in different energy ranges. The generated electron energy spectra all have an exponentially broad energy spectrum structure. The composite target structure of this invention can fill the gap in simulating space electron radiation environments in multiple orbits, which is of great significance for ground-based research on space radiation effects. The target is simple and easy to manufacture, which helps to control the cost of target material production.

[0028] 2. Regarding the space radiation environment, orbits at different altitudes have significantly different radiation environments. This invention uses laser-driven electron acceleration to simulate electron radiation in different orbits, enabling the simulation of multiple complex environments at a relatively low cost. By utilizing the variations in the electron acceleration mechanism in plasmas of varying densities and controlling the target length, the electron energy spectrum can be regulated to match the electron radiation environments of different orbits. Combining theory with two-dimensional particle simulation experiments, this invention proposes a target design scheme for space orbit electron radiation environments. This scheme analyzes the electron temperatures of different orbits and statistically analyzes the changes in electron temperature to adjust the density and length parameters of target I, ensuring that the electron beam generated by the interaction between the laser and the target matches the electron radiation environment of a given orbit.

[0029] 3. This invention can generate femtosecond laser pulses by selecting different laser and optical system configurations. Aerogel targets I of varying densities and lengths are produced using 3D printing technology and combined with a solid aluminum or hydrocarbon target II using an adhesive. The electron beam accelerated by the laser is then incident on an electron beam diagnostic system after passing through a magnetic focusing system. This allows analysis of the energy spectrum and angular divergence of the electron beam, enabling ground-based simulation of the electron radiation environment at different orbits in space.

[0030] 4. The present invention provides a method and system for simulating the space orbit electron radiation environment, which can not only provide analytical guidance for ground simulation of different orbit electron radiation environments and help experiments select target types with appropriate parameters, but also the solution has multiple application scenarios and provides a solution for conducting multi-field radiation effect research on ground simulation of space radiation environment.

[0031] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 This is a schematic structural diagram of a system for simulating space orbit electron radiation environment provided by the present invention;

[0034] Figure 2 This is a principle diagram and parameter diagram of a composite target in a system for simulating space orbit electron radiation environment provided by the present invention; wherein, Figure 2 (a) is the principle diagram of the composite target. Figure 2 (b) is the parameter diagram of the composite target;

[0035] Figure 3 This is a flow chart of a method for simulating space orbit electron radiation environment provided by the present invention;

[0036] Among them, 1. Femtosecond laser system, 2. Optical system, 3. Composite target, 4. Magnet, 5. Beam detector, 6. Electron spectrometer, 7. Computer, 8. Vacuum chamber, 9. Vacuum target chamber. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0038] like Figure 1 and Figure 2 As shown, the present invention provides a system for simulating a space orbit electron radiation environment, the system comprising a femtosecond laser system 1, a vacuum chamber 8, an optical system 2, a composite target 3, a focusing magnetic field, a beam detector 5, and an electronic spectrometer 6; the composite target 3, the focusing magnetic field, the beam detector 5, and the electronic spectrometer 6 are all arranged in the vacuum chamber 8;

[0039] The femtosecond laser system 1 is used to generate a femtosecond laser. After the femtosecond laser is injected into the optical system 2, a modulated femtosecond laser is obtained. The modulated femtosecond laser is injected into the vacuum target chamber 9 to ionize the atoms of the composite target 3 into plasma, and an accelerated electron beam is formed under the combined action of the laser ponderomotive force or the surface ponderomotive force acceleration and the J×B heating mechanism. After passing through the focusing magnetic field, the electron beam is first injected into the beam detector 5 to obtain the charge amount and divergence angle information of the electron beam, and then injected into the electron spectrometer 6 to obtain the energy spectrum of the electron beam, thereby realizing the ground simulation of the electron radiation environment of different orbits in space.

[0040] The composite target 3 is T-shaped, including target I and target II arranged perpendicular to each other; the incident direction of the modulated femtosecond laser is parallel to target I, that is, it first enters target I in the composite target 3 in parallel and then enters target II perpendicularly.

[0041] In a specific embodiment, the femtosecond laser system 1 includes a laser, a filter and a compression amplifier connected in sequence, which are used to provide femtosecond laser with intensity and pulse width. The optical system 2 includes an optical transmission device and a laser focusing device, which are used to modulate the focal spot and angle of the laser and control laser transmission and focusing. The composite target 3 is arranged in a vacuum target chamber 9, which is used to fix the combined target I and target II. The focusing magnetic field is a magnet 4, which can focus the accelerated electron beam. The beam detector 5 obtains the charge amount and divergence angle information of the electron beam, and the electron spectrometer 6 obtains the energy spectrum of the electron beam. The beam detector 5 and the electron spectrometer 6 are both electrically connected to a computer 7 for deriving simulation experimental data.

[0042] In one specific embodiment, target I is an aerogel target or carbon nanotube target with adjustable density and length; plasma target II is a high-density solid aluminum target or hydrocarbon target. Aerogel targets I of varying density and length are produced using 3D printing technology and combined with solid aluminum target II using an adhesive. The electron beam energy information described in this invention can be obtained using a beam detector and an electron spectrometer and rapidly derived using a computer in numerical simulations. Target I is made of aerogel, and current 3D printing technology can produce square targets of specific density and length.

[0043] The electron number density of target I is 5×10 19 cm -3 ≤n e ≤1.1×10 22 cm -3 , length 1μm≤l≤8μm, width 0.1μm≤d≤1μm. The electron number density of target II is 2×10 22 cm -3 ≤n e ≤3×10 23 cm -3 , length 20μm≤l≤200μm, width 10μm≤D≤80μm.

[0044] The normalized intensity of the femtosecond laser is 2.8≤a0≤4.7, corresponding to a peak power of 1×10 19 W / cm 2 ≤I0≤3×10 19 W / cm 2 , the pulse length is 20fs≤τ≤80fs, and the focal spot radius is 3μm≤σ≤8μm. Preferably, the initial laser is set to a normalized intensity a0=3.2, the incident laser propagates along the x-axis, is polarized along the y-axis, and is a Gaussian pulse in both the transverse and longitudinal directions. The laser field intensity expression is:

[0045]

[0046] Where ξ = x-ct is the co-moving coordinate, r is the lateral distance from the optical axis, the laser pulse width τ0 = 40 fs, and the focal spot radius σ0 = 5 μm.

[0047] The laser electron acceleration experiment in the present invention is specifically as follows: a femtosecond laser system generates a beam of linearly polarized femtosecond laser, the femtosecond laser focal spot and angle are modulated by an optical system, the modulated femtosecond laser is injected into the target chamber to ionize the atoms in the combined target into plasma, and an accelerated electron beam is formed under the combined action of laser ponderomotive force or surface ponderomotive force acceleration and J×B heating mechanism. Different target parameters are used to produce different acceleration effects, thereby obtaining electron beams with different electron temperatures.

[0048] The radiation environment in space varies significantly at orbits of different altitudes. This invention uses laser particle acceleration to simulate electron radiation in different orbits, enabling the simulation of a variety of complex environments at a relatively low cost. By utilizing the variations in the electron acceleration mechanism in plasmas of varying densities and controlling the target length, the electron energy spectrum can be regulated to match the electron radiation environment of different orbits. While maintaining fixed laser parameters and target II parameters, this invention adjusts the density and length of target I to obtain an electron beam that matches the electron energy spectrum of different orbits in space, thereby simulating the electron radiation environment of different orbits in space. This fills a gap in the field of space radiation environment simulation for ground-based simulations of different orbital radiation environments, and provides a theoretical analysis model for subsequent experimental work, thus providing certain guiding significance.

[0049] like Figure 3 As shown, the present invention also provides a method for simulating a space orbit electron radiation environment, which uses the above-mentioned space orbit electron radiation environment simulation system to conduct an experiment, specifically comprising the following steps:

[0050] Step 1. Determine the perigee and apogee heights, inclination, and operating time of the target orbit, and use the AE8 or AE9 model to calculate the electron energy spectrum of the target orbit. Based on the electron energy spectrum of the target orbit, the electron cutoff energy of the target orbit can be directly obtained; based on the electron energy spectrum of the target orbit, the fitted electron temperatures at the low energy end (less than 1 MeV) and the high energy end (greater than 1 MeV) are calculated respectively.

[0051] Step 2: After determining the target orbital electron temperature, within the laser and target parameter range, that is, the laser normalized intensity 2.8≤a0≤4.7, corresponding to the peak power 1×10 19 W / cm 2 ≤I0≤3×10 19 W / cm 2 , pulse length 20fs≤τ≤80fs, focal spot radius 3μm≤σ≤8μm, target I electron number density 5×10 19 cm -3 ≤n e ≤1.1×10 22 cm -3 , length 1μm≤l≤8μm, width 0.1μm≤d≤1μm, target II electron density 2×10 22 cm -3 ≤n e ≤3×10 23 cm -3 , length 20μm≤l≤200μm, width 10μm≤D≤80μm, select appropriate initial parameters.

[0052] Step 3: Based on the initial parameters: laser normalized intensity a0 = 3.2, corresponding to peak power I0 = 1.4×10 19 W / cm 2 , pulse length τ = 40 fs, focal spot radius σ = 5 μm, target I electron number density n e =1.1×10 20 cm -3 , length l = 3 μm, width d = 1 μm, target II electron number density n e =6.6×10 22 cm -3 , length L = 30 μm, width D = 10 μm, the electron cutoff energy is 5.6 MeV, and the high-energy electron temperature is 0.64 MeV. Keeping the laser parameters and target II parameters unchanged, the density and length of target I are adjusted. When the density increases, the electron cutoff energy increases, and the electron temperature increases. Among them, the density is 3.3×10 20 cm -3 When the length is below 1μm, the electron cutoff energy increases slightly, about 1MeV in the range of 1μm-8μm, the electron temperature increases by about 0.2MeV, and the density exceeds 3.3×10 20 cm -3 When the length is increased, the electron cutoff energy and electron temperature have obvious gain effects. The maximum increase is about 9MeV in the range of 1μm-8μm, and the electron temperature increases by about 1.5MeV.

[0053] Step 4: Input all parameters into the particle simulation program LAPINE for two-dimensional simulation calculations, count the momentum and quantity information of the electrons collected after target II, calculate the electron energy spectrum and the electron temperatures at the low and high energy ends, and directly obtain the electron cutoff energy.

[0054] Step 5: When the electron temperature and electron cutoff energy obtained by adjusting the density and length information of target I match the electron energy spectrum information corresponding to the target orbit, the electron radiation environment of the target orbit is obtained.

[0055] The method of the present invention determines the target orbital energy spectrum structure information, calculates the electron energy spectrum to obtain the electron temperature at the low and high energy ends, and determines the laser intensity, focal spot radius, pulse width, and the density and size of targets I and II to obtain an electron beam that matches the target orbital electron radiation energy spectrum. The present invention uses a two-dimensional particle simulation experiment to select specific laser and target parameters to obtain an electron beam that matches the target orbital electron energy spectrum. The degree of matching between the obtained electron energy spectrum structure and the target orbital electron energy spectrum is determined by simple calculation and analysis, and combined with theory, it is found that for target I with an electron number density less than n e =1×10 20 cm -3In the case of laser ponderomotive force, the electron acceleration mechanism is dominated by the laser ponderomotive force. As the electron number density increases, the electron acceleration mechanism gradually transitions from laser ponderomotive force to surface ponderomotive force. At this point, the length of Target I is positively correlated with the cutoff energy of the accelerated electrons. By switching between these two acceleration mechanisms, the electron beam energy spectrum structure and electron temperature obtained by targets of different densities and lengths can be effectively controlled, thereby achieving a result that closely matches the electron energy spectrum of the target orbit.

[0056] This invention provides a method and system for simulating the electron radiation environment in a space orbit. By calculating the electron energy spectrum of the target orbit, determining the electron temperature, and selecting laser parameters within a certain range and combining the density and size of Targets I and II within the target, the system generates an electron beam with a specific energy distribution that matches the space electron radiation energy spectrum of the target orbit. This method can help ground-based simulations of space radiation environments by providing target design solutions based on laser particle acceleration, obtaining electron beams with specified energy distributions, and facilitating research on radiation effects in fields such as materials science and biology.

[0057] The present invention is further explained and illustrated below in conjunction with specific embodiments.

[0058] The proposed method is based on ground-based simulations of the electron radiation environment in different orbits using the two-dimensional particle simulation software LAPINE. Taking the GPS orbit electron energy spectrum as an example, with an operating altitude of 36,000 km, an orbital inclination of 55°, and an operating time of 15 years, the model software calculated an electron energy spectrum cutoff energy of 6.5 MeV and a fitted electron temperature of 0.62 MeV at the high-energy end.

[0059] Set the laser normalized intensity a0 = 3.2, pulse width τ0 = 40 fs, and focal spot radius σ0 = 5 μm. The incident laser propagates along the x-axis, is polarized along the y-axis, and is Gaussian in both the transverse and longitudinal directions. The laser field intensity expression is:

[0060]

[0061] Where ξ = x-ct is the co-moving coordinate, and r is the lateral distance from the optical axis.

[0062] According to the initial parameters, the electron beam cutoff energy is 5.6MeV and the electron temperature at the high energy end is 0.64MeV. To improve the electron cutoff energy, the electron number density of target I can be increased to increase the cutoff energy, while reducing the length of target I. Set the electron number density of target I n e =8.3×10 20 cm -3 , length l = 2.4 μm, width d = 1 μm, solid aluminum target II, electron number density n e =6.6×10 22 cm -3, length L = 30 μm, width D = 10 μm.

[0063] Laser and target parameters were imported into the two-dimensional particle simulation software LAPINE for calculations. A simulation window of 40 μm × 30 μm was selected to reduce unnecessary calculations. The grid was divided into 8000 × 2000 grids, each containing 20 macroparticles, each representing 5000 electrons or ions.

[0064] After the calculation is completed, the electron energy distribution information is collected, and the electron cutoff energy is 5.9MeV. The calculated high-energy end electron temperature is 0.63MeV, which is consistent with the high-energy end electron temperature of the target orbit.

[0065] This solution is universal for the space electron radiation environment with orbital altitudes between 500 km and 40,000 km, that is, the electron cutoff energy is concentrated within 8 MeV, and the electron temperature is in the range of 0.4-1 MeV. The parameters of the laser and target selected within the scope of the claims can meet the simulation calculation within this range.

[0066] The present invention is very easy to apply in numerical simulation experiments. The target orbit electron energy spectrum is very convenient to calculate using the space radiation environment model software, and the electron temperature calculation method is simple and rapid. At the same time, it is very quick to modify the parameters in the numerical simulation experiment, and the simulation results can be quickly obtained and sorted and analyzed. In actual experiments, square targets of different densities and sizes can be easily obtained through 3D printing technology. They are ionized into plasma by a pre-laser pulse. The electron beam accelerated after the laser is incident is incident into the electron beam diagnostic system after passing through the magnetic focusing system. The motion trajectory of the electron on the imaging target is captured by a CCD camera, and the energy spectrum and divergence of the electron beam and other information can be analyzed. The method and system for simulating the space orbit electron radiation environment proposed by the present invention can provide a solution for ground simulation of electron radiation in different orbits. At the same time, the method has a simple process and fast calculation, and can quickly provide various parameters of the laser and the target.

[0067] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A system for simulating the electron radiation environment of a space orbit, characterized in that: The system includes a femtosecond laser system, a vacuum chamber, an optical system, a composite target, a focusing magnetic field, a beam detector, and an electron spectrometer; The composite target, focusing magnetic field, beam detector and electron spectrometer are all arranged in a vacuum chamber; The femtosecond laser system generates a beam of femtosecond laser light, which is modulated by an optical system for transmission and focusing. The modulated femtosecond laser light is injected into a vacuum target chamber to ionize atoms of a composite target into plasma. An accelerated electron beam is formed under the combined action of laser ponderomotive force or surface ponderomotive force acceleration and a J×B heating mechanism. The electron beam passes through a focusing magnetic field and is injected into a beam current monitor to obtain information on the charge and divergence angle of the electrons. The energy spectrum of the electron beam is then obtained by an electron spectrometer, thereby achieving ground-based simulation of electron radiation environments in different orbits in space. The composite target is T-shaped, including target I and target II arranged perpendicular to each other. The incident direction of the femtosecond laser is parallel to target I. The femtosecond laser first enters target I in the composite target in parallel and then enters target II perpendicularly.

2. The system for simulating space orbit electron radiation environment according to claim 1, characterized in that: The target I is an aerogel target or a carbon nanotube target whose density and length can be adjusted; the target II is a solid aluminum target or a hydrocarbon target.

3. The system for simulating space orbit electron radiation environment according to claim 2, characterized in that: Aerogel targets I with different densities and lengths were obtained using 3D printing technology and combined with solid aluminum target II using adhesives.

4. The system for simulating space orbit electron radiation environment according to claim 2, characterized in that: The electron number density of target I is , the length is , with a width of ; The electron number density of target II is , the length is , with a width of .

5. The system for simulating space orbit electron radiation environment according to claim 1, characterized in that: The beam detector and the electronic spectrometer are both connected to a computer.

6. The system for simulating space orbit electron radiation environment according to claim 1, characterized in that: The focusing magnetic field is a magnet.

7. The system for simulating space orbit electron radiation environment according to claim 1, characterized in that: The composite target is arranged in a vacuum target chamber and is used to fix the combined target I and target II.

8. The system for simulating space orbit electron radiation environment according to claim 1, characterized in that: The normalized intensity of the femtosecond laser is , the corresponding peak power is , the pulse length is , the focal spot radius is .

9. A method for simulating a space orbit electron radiation environment, characterized in that: Conducting an experiment using a system for simulating a space orbit electron radiation environment as described in any one of claims 1 to 8 comprises the following steps: Acquiring target orbital information to obtain electron energy spectrum information corresponding to the target orbital; the electron energy spectrum information corresponding to the target orbital includes electron temperature and electron cutoff energy; Under the condition of fixed laser parameters and target II parameters, the density and length information of target I are changed, the energy and number information of the electron beam generated by target II are collected, and the energy spectrum information of the electron beam and its corresponding electron temperature and electron cutoff energy are obtained; When the electron temperature and electron cutoff energy obtained by adjusting the density and length information of target I match the electron energy spectrum information corresponding to the target orbit, the electron radiation environment of the target orbit is obtained.

10. The method for simulating space orbit electron radiation environment according to claim 9, characterized in that: Obtain target orbital information and obtain the electron energy spectrum information corresponding to the target orbital, specifically: Obtain the perigee and apogee heights, inclination, and running time of the target orbit, and calculate the electron energy spectrum of the target orbit using the AE8 or AE9 model. Directly obtaining the electron cutoff energy of the target orbital according to the electron energy spectrum of the target orbital; According to the electron energy spectrum of the target orbit, the electron temperatures of the low energy segment and the high energy segment are calculated respectively.

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