Research on Secondary Electron Emission and Multipactor Discharge via Surface Micro-trapped Structure

doi:10.3901/JME.2018.09.121

Abstract

Abstract: With the purpose of suppressing multipactor discharges in spacecraft, a kind of micro-trap structure is proposed to reduce hold secondary electron emission from the sample surface. After etching structure on the surface and spurting metals on its structure surface, samples with micro-trap structure on its surface are obtained and tested their secondary electron emission characteristics in a testing platform(20~4 000 eV). In addition, a numerical simulation model is built with dividing the emitted electron into the elastic backscattering electrons, the inelastic backscattering electrons and the true secondary electrons. Numerical simulation results agree well with experimental results. Experimental and simulation results show that those micro-trap structure can help suppress secondary electron emission effectively, and the depth-to-width ratio of structure will enhance the effect of suppression as well. Surface structure with a cylindrical hole resist the secondary electron emission better than the surface structure with rectangle groove when their depth-to-width ratios are the same. Furthermore, a sample with a larger depth-to-width ratio can not only corresponds a less maximum secondary electron yield and a larger first cross energy, but also improve the quality factor of multipactor discharge F linearly.

Key words: micro-trapped structure, multipactor discharge, numerical analysis, secondary electron emission

CLC Number:

O462

FENG Guobao, CUI Wanzhao, HU Tiancun, CHEN Bangdao, WANG Ning. Research on Secondary Electron Emission and Multipactor Discharge via Surface Micro-trapped Structure[J]. Journal of Mechanical Engineering, 2018, 54(9): 121-127.

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