Geosynchronous orbit material non-equivalent charged test device

Abstract

The invention discloses a geosynchronous orbit material non-equivalent charged test device. By using the device, a geosynchronous orbit non-equivalent charged environment required by experiments can be effectively generated, and the device has the advantages of being small in environmental plasma density and energy fluctuation, adjustable in plasma parameter, changeable in illumination condition and the like. According to the device, a to-be-detected sample is placed in a vacuum chamber, and the vacuum environment of a geosynchronous orbit is simulated; then a double-Maxwell distribution function is adopted to simulate the distribution of high-energy plasmas of the geosynchronous orbit, and two electron guns are used for simulating the plasma energy corresponding to two peaks in the double-Maxwell distribution function respectively, so that the most severe environment of the geosynchronous orbit is simulated; meanwhile, the light influence of the non-equivalent charged effect of a material is considered, and a solar simulation ultraviolet light source is adopted to simulate the irradiation condition, so that the charge and discharge performance of the to-be-detected sample under the worst condition and the light condition is obtained.

Description

technical field [0001] The invention relates to the field of space plasma environment ground simulation technology, and is applicable to the simulation of the charged environment ground of the surface material of a synchronous orbit spacecraft, in particular to a space environment magnetic storm plasma and a space environment that cause unequal charging effects on adjacent materials on the surface of the spacecraft. Experimental device for ground simulation of light environment. Background technique [0002] The ground height of Geosynchronous Orbit (GEO) is about 36,000km. Normally, the entire orbit runs through the high-energy electron ion cloud from the solar wind on the sunny side (often causing geomagnetic substorms), the outer Van Allen radiation belt, and the low-energy, high-density plasma in the shadow area of ​​the earth. body environment. Because the geosynchronous orbit runs through different regions, and the plasma energy and temperature in different regions ar...

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Problems solved by technology

Moreover, unequal charging will form local potential wells and barriers near the surface of different adjacent materials, and the formation of potential wells will affect the emission of photoelectrons, backscattered electrons and secondary electrons on the material surface, thereby affecting the emission of material surfaces. Potential distribution

[0004] During geomagnetic substorms, there will be a large amount of high-energy plasma in the geosynchronous orbit, and its energy range is 0.1-50keV. At present, single Maxwell or double Maxwell distribution functions are used to characterize the characteristics of synchronous orbit plasma at home and abroad. However, due to the The energy coverage is wide, which leads to great technical difficulties in simulating the characteristics of energy spectrum plasma in ground tests

[0005] At present, for the ground simulation test of the unequal electrification effect of materials in geosynchronous orbit spacecraft, domestic research in this area is in its infancy, and there is no relevant test method for the unequal electrification effect of space materials in the literature. According to engineering requirements, it needs to be established independently And test the validity of the unequal charging effect ground test

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