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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. © 2018 Journal of Mechanical Engineering.
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Jixie Gongcheng Xuebao/Journal of Mechanical Engineering
ISSN: 0577-6686
Year: 2018
Issue: 9
Volume: 54
Page: 121-127
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 5
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count: -1
Chinese Cited Count: -1
30 Days PV: 1