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Chin. Phys. B, 2021, Vol. 30(1): 017901    DOI: 10.1088/1674-1056/abc2be
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Analysis of secondary electron emission using the fractal method

Chun-Jiang Bai(白春江)1, Tian-Cun Hu(胡天存)1, Yun He(何鋆)1, Guang-Hui Miao(苗光辉)1, Rui Wang(王瑞)1, Na Zhang(张娜)1, and Wan-Zhao Cui(崔万照)1,
National Key Laboratory of Science and Technology on Space Science, China Academy of Space Technology (Xi'an), Xi'an 710100, China
Abstract  Based on the rough surface topography with fractal parameters and the Monte-Carlo simulation method for secondary electron emission properties, we analyze the secondary electron yield (SEY) of a metal with rough surface topography. The results show that when the characteristic length scale of the surface, G, is larger than 1× 10-7, the surface roughness increases with the increasing fractal dimension D. When the surface roughness becomes larger, it is difficult for entered electrons to escape surface. As a result, more electrons are collected and then SEY decreases. When G is less than 1× 10-7, the effect of the surface topography can be ignored, and the SEY almost has no change as the dimension D increases. Then, the multipactor thresholds of a C-band rectangular impedance transfer and an ultrahigh-frequency-band coaxial impedance transfer are predicted by the relationship between the SEY and the fractal parameters. It is verified that for practical microwave devices, the larger the parameter G is, the higher the multipactor threshold is. Also, the larger the value of D, the higher the multipactor threshold.
Keywords:  secondary electron emission yield      the fractal method      multipactor  
Received:  22 July 2020      Revised:  04 September 2020      Accepted manuscript online:  20 October 2020
PACS:  79.20.Hx (Electron impact: secondary emission)  
  05.45.Df (Fractals)  
  52.80.Pi (High-frequency and RF discharges)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1537211 and 61901361).
Corresponding Authors:  Corresponding author. E-mail: cuiwanzhao@126.com   

Cite this article: 

Chun-Jiang Bai(白春江), Tian-Cun Hu(胡天存), Yun He(何鋆), Guang-Hui Miao(苗光辉), Rui Wang(王瑞), Na Zhang(张娜), and Wan-Zhao Cui(崔万照) Analysis of secondary electron emission using the fractal method 2021 Chin. Phys. B 30 017901

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