Particle-in-cell simulation of multipactor discharge on a dielectric in a parallel-plate waveguide

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• 作者：A. S. Sakharov ; V. A. Ivanov ; M. E. Konyzhev
• 刊名：Plasma physics reports
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：6
• 页码：610-618
• 全文大小：1,429 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Atoms, Molecules, Clusters and Plasmas
  Russian Library of Science
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-6938
• 卷排序：42

文摘

An original 2D3V (two-dimensional in coordinate space and three-dimensional in velocity space) particle-in-cell code has been developed for simulation of multipactor discharge on a dielectric in a parallelplate metal waveguide with allowance for secondary electron emission (SEE) from the dielectric surface and waveguide walls, finite temperature of secondary electrons, electron space charge, and elastic and inelastic scattering of electrons from the dielectric and metal surfaces. The code allows one to simulate all stages of the multipactor discharge, from the onset of the electron avalanche to saturation. It is shown that the threshold for the excitation of a single-surface multipactor on a dielectric placed in a low-profile waveguide with absorbing walls increases as compared to that in the case of an unbounded dielectric surface due to escape of electrons onto the waveguide walls. It is found that, depending on the microwave field amplitude and the SEE characteristics of the waveguide walls, the multipactor may operate in two modes. In the first mode, which takes place at relatively low microwave amplitudes, a single-surface multipactor develops only on the dielectric, the surface of which acquires a positively potential with respect to the waveguide walls. In the second mode, which occurs at sufficiently high microwave intensities, a single-surface multipactor on the dielectric and a two-surface multipactor between the waveguide walls operate simultaneously. In this case, both the dielectric surface and the interwall space acquire a negative potential. It is shown that electron scattering from the dielectric surface and waveguide walls results in the appearance of high-energy tails in the electron distribution function.Original Russian Text © A.S. Sakharov, V.A. Ivanov, M.E. Konyzhev, 2014, published in Uspekhi Prikladnoi Fiziki, 2014, Vol. 2, No. 5, pp. 476–485.