A solar proton spectrum modulator design method and system

Abstract

The present invention relates to a solar proton energy spectrum modulator design method, comprising the following steps: calculating the integrated total area of ​​the geosynchronous orbit solar proton energy spectrum; dividing the geosynchronous orbit solar proton energy spectrum into multiple energy spectrum intervals and solving for the average value of the proton energy in each interval; calculating the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum based on the average value of the proton energy in each interval; selecting a total material thickness, and sequentially reducing the total material thickness in a preset shape according to the thickness and corresponding area proportion required for the average energy corresponding to each energy spectrum interval to form an energy reduction sheet; supporting the energy reduction sheet and enabling the energy reduction sheet to rotate along its geometric center at a set speed. The present invention also provides a solar proton energy spectrum modulator design system. Using the solar proton energy spectrum modulator design method and system of the present invention, a radiation environment comparable to the solar proton energy spectrum in space can be obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of solar proton irradiation environment simulation, and in particular relates to a solar proton energy spectrum modulator design method and system. Background Art

[0002] When spacecraft such as artificial satellites, deep space probes, manned spacecraft, and space stations perform their missions, their internal electronic components and astronauts are inevitably exposed to high-energy particles from the space radiation environment. High-energy particles in the space radiation environment primarily include protons, alpha particles, and heavy ions, with protons accounting for up to 85% of these particles. These particles primarily originate from solar cosmic rays, released during solar activity. Therefore, solar cosmic rays, also commonly referred to as solar proton rays, are primarily influenced by the cyclical nature of solar activity. Therefore, before conducting space missions such as deep space exploration and manned spaceflight, it is necessary to investigate the impact of solar proton radiation on onboard electronic components and astronauts.

[0003] When high-energy protons irradiate electronic components, some of their energy is deposited within them. On the one hand, the high-energy protons transfer their energy to atoms in the semiconductor lattice within the device through a non-ionizing process. These atoms then displace themselves from their original positions in the lattice, forming Frenkel defect pairs. This phenomenon is also known as displacement damage. Displacement damage often alters the band structure of the semiconductor material, thereby affecting the electrical performance of the electronic component. On the other hand, high-energy protons react with the semiconductor material in the electronic component to produce heavy ions. These heavy ions directly ionize the electronic components, causing single-event effects (SEEs), which can affect the stable operation of spacecraft and threaten the mission's success. Numerous serious space accidents have been caused by radiation effects in both China and abroad, with SEEs accounting for 86% of all radiation effects. The ocean observation satellite TOPEX / Poseidon, the Globalstar-1 satellite in the Globalstar constellation, and the Galileo probe used for Jupiter exploration have all suffered serious functional failures due to SEEs. Furthermore, astronauts will inevitably be exposed to high-energy particle radiation during space missions, and high-energy proton radiation can have serious health consequences. To improve the reliability of electronic components during space missions and ensure the health of astronauts, it is necessary to study the relevant radiation effects using ground-based radiation environment simulation devices and assess the comprehensive performance of electronic components under radiation conditions, particularly the effects of solar protons.

[0004] Currently, radiation effect experiments in China primarily rely on proton accelerators and other related devices, and these proton irradiation experiments primarily utilize protons of a single energy. Therefore, the proton radiation sources used in current proton irradiation experiments differ significantly from the actual solar proton radiation environment. This is primarily due to the fact that current ground-based proton simulation sources use protons of a single energy, while solar protons in space have a continuous energy spectrum. To study electronic components and astronauts exposed to real solar proton radiation, the energy of the proton beam emitted by the accelerator must be modulated to align with the energy spectrum of solar protons in real space. Summary of the Invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a solar proton spectrum modulator design method and system to obtain a radiation environment that can be comparable to the solar proton spectrum in space.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a solar proton energy spectrum modulator design method, including the steps of: calculating the integrated total area of ​​the geosynchronous orbit solar proton energy spectrum; dividing the geosynchronous orbit solar proton energy spectrum into multiple energy spectrum intervals, and solving the average value of the proton energy in each interval; calculating the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum based on the average value of the proton energy in each interval; selecting the total thickness of the material, and in turn reducing the total thickness of the material in a preset shape according to the thickness and corresponding area proportion required for the average energy corresponding to each energy spectrum interval to form an energy reduction sheet; supporting the energy reduction sheet and allowing the energy reduction sheet to rotate along the geometric center at a set speed.

[0007] Furthermore, when dividing the energy spectrum into multiple intervals, the density of regional division is increased in the portion where the energy spectrum changes dramatically.

[0008] Furthermore, the total thickness of the material is the material thickness required to completely block protons with an energy equal to the maximum energy of the solar proton spectrum introduced by the accelerator.

[0009] Furthermore, the preset shape is a circular ring, the depth of the circular ring is the thickness of the energy reduction material required for the average energy in the corresponding energy spectrum interval, and the ratio of the area of ​​the circular ring to the total area of ​​the energy reduction plate is the proportion of the integral area of ​​the average energy in the corresponding energy spectrum interval to the integral total area.

[0010] Furthermore, the preset shape is a plurality of micropores, the depth of the plurality of micropores is the thickness of the energy reduction material required for the average energy in the corresponding energy spectrum interval, and the ratio of the total area of ​​the plurality of micropores to the total area of ​​the energy reduction sheet is the proportion of the integral area of ​​the average energy in the corresponding energy spectrum interval to the integral total area.

[0011] Furthermore, the plurality of micropores are randomly distributed.

[0012] Furthermore, when the preset shape is a circular ring, the energy reduction sheet is in a step shape.

[0013] Furthermore, before calculating the integrated total area of ​​the geosynchronous orbit solar proton energy spectrum, the method further includes the step of screening the energy reduction sheet material.

[0014] Furthermore, when screening the energy reduction sheet materials, the Monte Carlo simulation method is used to calculate the highest energy protons in the solar proton energy spectrum passing through different candidate energy reduction materials, and the materials with the lowest secondary particle yield are screened out as candidate materials for the energy reduction sheet.

[0015] The present invention also provides a solar proton energy spectrum modulator design system, including: an integral total area calculation unit, used to calculate the integral total area of ​​the geosynchronous orbit solar proton energy spectrum; an energy spectrum division unit, used to divide the geosynchronous orbit solar proton energy spectrum into multiple energy spectrum intervals, and solve the average value of the proton energy in each interval; a proportion solving unit, used to calculate the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum based on the average value of the proton energy in each interval; an energy reduction sheet forming unit, used to select the total thickness of the material, and in turn, reduce the total thickness of the material in a preset shape according to the thickness and corresponding area proportion required for the average energy corresponding to each energy spectrum interval to form an energy reduction sheet; a support unit, used to support the energy reduction sheet and enable the energy reduction sheet to rotate along the geometric center at a set speed.

[0016] The present invention achieves this by precisely modulating the energy spectrum of the proton beam emitted by the accelerator to match the true solar proton energy spectrum in geosynchronous orbit through the design of the energy-reducing plate structure. Furthermore, rotating the energy-reducing plate allows the modulated protons to be evenly distributed within the beam spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a flow chart of the steps of a solar proton spectrum modulator design method of the present invention;

[0018] Figure 2 This is a schematic diagram of the working principle of the solar proton spectrum modulator;

[0019] Figure 3 This is a schematic diagram of the solar proton energy spectrum;

[0020] Figure 4 is a front view schematic diagram of a solar proton spectrum modulator when the preset shape is a ring;

[0021] Figure 5 is a schematic cross-sectional view of a solar proton spectrum modulator when the preset shape is a ring;

[0022] Figure 6is a front view schematic diagram of a solar proton spectrum modulator when the preset shape is a microhole;

[0023] Figure 7 This is a cross-sectional schematic diagram of a solar proton spectrum modulator when the preset shape is a microhole. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-7 As shown, the present invention provides a solar proton spectrum modulator design method, which includes the following steps:

[0026] S1, calculate the integrated total area of ​​the solar proton energy spectrum in geosynchronous orbit;

[0027] Specifically, the distribution of the solar proton energy spectrum in the geosynchronous orbit is integrated according to its energy, and the obtained integral area is set to S:

[0028]

[0029] where φ(E) is the proton flux that varies with energy.

[0030] S2, divide the solar proton energy spectrum in geosynchronous orbit into multiple energy spectrum intervals and calculate the average value of proton energy in each interval;

[0031] Specifically, the solar proton energy spectrum in the geosynchronous orbit is evenly divided into multiple energy spectrum intervals according to energy. The larger the number of energy spectrum intervals, the better. The density of regional division should be increased accordingly in the part where the energy spectrum changes more dramatically.

[0032] After the energy spectrum intervals are divided, the average value of the proton energy in the interval is obtained for the corresponding segmented energy spectra in multiple energy spectrum intervals:

[0033]

[0034] For each energy spectrum interval, the average energy of protons in each interval is expressed as Indicates that the average energy value of the protons in each interval is used as the proton energy in that area, such as Figure 3 shown.

[0035] S3, based on the average proton energy in each interval, calculate the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum;

[0036] Specifically, after obtaining the average proton energy of each interval, each energy spectrum interval is integrated according to its energy to obtain the integral area of ​​each energy spectrum interval. The calculation method is:

[0037]

[0038] That is, the integral areas obtained by multiple calculations are S1, S2, ..., S N By dividing the integral areas obtained by multiple calculations by the total integral area, we can get the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum. For example, S1 / S=P1, S2 / S=P2, ..., S N / S=P N .

[0039] S4, selecting the total thickness of the material, and sequentially reducing the total thickness of the material and the corresponding area ratio according to the average energy corresponding to each energy spectrum interval in a preset shape to form an energy reduction sheet;

[0040] Specifically, the total thickness of the material is determined by the thickness required to completely block protons emitted by the accelerator with an energy equal to the maximum energy of the solar proton spectrum. Based on the intervals of the geosynchronous solar proton energy spectrum, the required thickness of the energy-reducing material is used to determine the required depth of the energy reduction sheet based on the average energy of each energy spectrum interval. The required area of ​​the energy reduction sheet is then determined based on the ratio of the integrated area of ​​each energy spectrum interval to the total integrated area.

[0041] Taking an example as an illustration, first, the material thickness D1 required to completely block protons with an energy equal to the maximum energy of the solar proton spectrum introduced by the accelerator is selected as the total thickness D.

[0042] Then, calculate the energy required to reduce the protons extracted from the accelerator to the average energy of the second energy spectrum partition (X1 to X2) The required thickness of the energy-reducing material is D2, and the required depth of reduction is D-D2. The ratio of the area to be reduced to the total area of ​​the energy-reducing sheet is the ratio of the average energy integrated area S2 of the second energy spectrum segment to the total integrated area S, that is, P2.

[0043] Next, the energy of the protons extracted from the accelerator is reduced to the average energy of the third energy spectrum partition (X2 to X3). The required energy reduction material thickness is D3, and the required reduction depth is D-D3. The ratio of the required reduction area to the total area of ​​the energy reduction sheet is the ratio of the average energy integrated area S3 of the third energy spectrum segment to the total integrated area S, that is, P3.

[0044] By analogy, after calculating the thickness and area corresponding to the reduction of all energy spectrum partitions, the material can be reduced according to the calculated data to form an energy reduction sheet.

[0045] Furthermore, the preset shape is a circular ring, wherein the depth of the circular ring is the thickness of the energy reduction material required for the average energy in the corresponding energy spectrum interval, and the ratio of the area of ​​the circular ring to the total area of ​​the energy reduction sheet is the proportion of the integral area of ​​the average energy in the corresponding energy spectrum interval to the integral total area.

[0046] Take an example as an example, when the average energy value of the energy spectrum interval is When the ratio of the integral to the total integral area S is P2, the required thickness of the energy reduction material is D2, then the depth of the cut ring is D-D2, and the total area of ​​the cut ring / the total area of ​​the energy reduction sheet = P2. When the preset shape is a circular ring, the energy reduction sheet structure is as follows Figure 4-5 shown.

[0047] Furthermore, the preset shape is a plurality of microholes, wherein the depth of the microholes is the thickness of the energy reducing material required for the average energy in the corresponding energy spectrum interval, and the ratio of the total area of ​​the plurality of microholes to the total area of ​​the energy reducing sheet is the proportion of the integral area of ​​the average energy in the corresponding energy spectrum interval to the integral total area.

[0048] Take a specific example as an example, when the average energy value of the energy spectrum interval is When the ratio of the integrated area to the total integrated area S is P2, the required thickness of the energy reducing material is D2, and the depth of the micro-hole is D-D2, and the total area of ​​the multiple micro-holes / the total area of ​​the energy reducing sheet = P2. When the preset shape is multiple micro-holes, the structure of the energy reducing sheet is as follows Figure 6-7 shown.

[0049] Furthermore, the plurality of micropores are randomly distributed.

[0050] It should be noted that when the preset shape is a circular ring, the energy reduction sheet is in a step-like shape. When the preset shape is a plurality of microholes, the smaller the aperture of each microhole, the better.

[0051] It is understandable that the preset shape can also be other shapes, as long as the energy reduction plate is formed according to the preset shape, the protons drawn out of the accelerator can be modulated into a proton beam that is completely consistent with the energy spectrum of solar protons in the geosynchronous orbit.

[0052] S5, supporting the energy reduction sheet and allowing the sheet to rotate along the geometric center at a set speed;

[0053] Specifically, after the energy reduction sheet is formed, a support structure for the sheet with a driving function is set up. During the test, the new energy reduction sheet rotates along the geometric center at a set speed, so that protons of different energies passing through the energy reduction sheet can be evenly distributed in the beam spot.

[0054] Furthermore, before step S1, the method further includes the following steps:

[0055] Screening of energy reduction sheet materials;

[0056] Specifically, the Monte Carlo simulation method is used to calculate the proton energy and secondary particle correlation of the highest energy protons in the solar proton energy spectrum after passing through different candidate energy reduction materials. After comprehensive evaluation, the material with the lowest secondary particle yield is selected as the candidate material for the energy reduction sheet.

[0057] The present invention also provides a solar proton spectrum modulator design system, which includes:

[0058] The integral total area calculation unit is used to calculate the integral total area of ​​the solar proton energy spectrum in geosynchronous orbit;

[0059] An energy spectrum division unit is used to divide the geosynchronous orbit solar proton energy spectrum into multiple energy spectrum intervals and calculate the average value of the proton energy in each interval;

[0060] The proportion solving unit is used to calculate the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum based on the average proton energy of each interval;

[0061] The energy reduction sheet forming unit is used to select the total thickness of the material and, in turn, reduce the total thickness of the material in a preset shape according to the thickness and corresponding area ratio of the energy material corresponding to the average energy of each energy spectrum interval to form the energy reduction sheet;

[0062] The supporting unit is used to support the energy reduction sheet and enable the energy reduction sheet to rotate along the geometric center at a set speed.

[0063] The above examples demonstrate that the present invention, through the design of the energy-reducing plate structure, precisely modulates the energy spectrum of the proton beam emitted by the accelerator to align with the true solar proton energy spectrum in geosynchronous orbit. Furthermore, by rotating the novel energy-reducing plate designed in the present invention, the modulated protons can be evenly distributed within the beam spot.

[0064] The method and system of the present invention are not limited to the embodiments described in the specific implementation manner. Those skilled in the art may derive other implementation manners based on the technical solution of the present invention, which also fall within the scope of the technical innovation of the present invention.

Claims

1. A solar proton spectrum modulator design method, characterized in that: include: Calculate the integrated total area of ​​the solar proton energy spectrum in geosynchronous orbit; Divide the solar proton energy spectrum in geosynchronous orbit into multiple energy spectrum intervals and calculate the average value of proton energy in each interval; Based on the average proton energy in each interval, calculate the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum; Select the total thickness of the material, and then reduce the thickness of the material and the corresponding area ratio according to the average energy corresponding to each energy spectrum interval in turn, and use the preset shape to reduce the total thickness of the material to form an energy reduction sheet; The energy reduction sheet is supported and can be rotated along the geometric center at a set speed.

2. The solar proton spectrum modulator design method according to claim 1, wherein: When dividing the energy spectrum into multiple intervals, the density of regional division is increased in the part where the energy spectrum changes dramatically.

3. The solar proton spectrum modulator design method according to claim 1, wherein: The total thickness of the material is the material thickness required to completely block protons with an energy equal to the maximum energy of the solar proton spectrum introduced by the accelerator.

4. The solar proton spectrum modulator design method according to claim 1, wherein: The preset shape is a circular ring, the depth of the circular ring is the thickness of the energy reduction material required for the average energy in the corresponding energy spectrum interval, and the ratio of the area of ​​the circular ring to the total area of ​​the energy reduction sheet is the proportion of the integral area of ​​the average energy in the corresponding energy spectrum interval to the total integral area.

5. The solar proton spectrum modulator design method according to claim 1, wherein: The preset shape is a plurality of micropores, the depth of the plurality of micropores is the thickness of the energy reducing material required for the average energy in the corresponding energy spectrum interval, and the ratio of the total area of ​​the plurality of micropores to the total area of ​​the energy reducing sheet is the proportion of the integral area of ​​the average energy in the corresponding energy spectrum interval to the integral total area.

6. The method for designing a solar proton spectrum modulator according to claim 5, wherein: The plurality of micropores are randomly distributed.

7. The method for designing a solar proton spectrum modulator according to claim 4, wherein: When the preset shape is a circular ring, the energy reduction sheet is in a step shape.

8. The solar proton spectrum modulator design method according to claim 1, wherein: Before calculating the integrated total area of ​​the geosynchronous orbit solar proton energy spectrum, the method further comprises the following steps: Screening of energy reduction sheet materials.

9. The method for designing a solar proton spectrum modulator according to claim 8, wherein: When screening the energy reduction sheet materials, the Monte Carlo simulation method is used to calculate the highest energy protons in the solar proton energy spectrum passing through different candidate energy reduction materials, and the materials with the lowest secondary particle yield are screened out as candidate materials for the energy reduction sheet.

10. A solar proton spectrum modulator design system, characterized in that: include: The integral total area calculation unit is used to calculate the integral total area of ​​the solar proton energy spectrum in geosynchronous orbit; An energy spectrum division unit is used to divide the geosynchronous orbit solar proton energy spectrum into multiple energy spectrum intervals and calculate the average value of the proton energy in each interval; The proportion solving unit is used to calculate the proportion of each energy spectrum interval in the entire geosynchronous orbit solar proton energy spectrum based on the average proton energy of each interval; The energy reduction sheet forming unit is used to select the total thickness of the material and, in turn, reduce the total thickness of the material in a preset shape according to the thickness and corresponding area ratio of the energy material corresponding to the average energy of each energy spectrum interval to form the energy reduction sheet; The supporting unit is used to support the energy reduction sheet and enable the energy reduction sheet to rotate along the geometric center at a set speed.

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