物理学报Issue(8)：1-7,7.DOI:10.7498/aps.64.085201
介质表面附近微波大气击穿的理论研究∗
Theoretical study of the microwave air breakdown at dielectric surface
摘要
Abstract
Microwave air breakdown at dielectric surface is investigated by numerically solving the fluid-based plasma equations coupled with the Maxwell equations. The plasma formation and microwave scattering and absorption by plasma are investigated by one-dimensional (1D) and two-dimensional (2D) models. In the 1D model, it is found that at the initial stage of microwave breakdown, the plasma develops in the whole plasma region. As time increases, the plasma in the upstream grows much faster than in the downstream. Although the electron density distributions for ne=0 and j=0 are different, the microwave reflection, absorption and transmission are almost the same. It is found that the electron number density in the upstream region for 20 mm is larger than for 5 mm. In the 2D model, it is found for TE10 mode that the plasmoid first grows in the middle of waveguide until its density becomes large enough to diffract the incident field, then the plasma region moves along the surface to both sides. The plasma region cannot reach the wall of waveguide, where the electric field is smaller than the breakdown threshold. After comparison between the computational and experimental results, it is found that the simulated absorbed power is larger than the measured one, and the transmitted power is smaller than than measured one. The reason is that the initial electron densities in 1D and 2D simulation are both assumed to cover the whole dielectric surface, but the plasma in experiment develops in a very small region.关键词
介质表面/微波大气击穿/数值模拟Key words
dielectric surface/microwave air breakdown/numerical simulation引用本文复制引用
周前红,董烨,董志伟,周海京..介质表面附近微波大气击穿的理论研究∗[J].物理学报,2015,(8):1-7,7.基金项目
国家重点基础研究发展规划(批准号:2013CB328904)、国家自然科学基金(批准号:11105018,11305015,61201113,11475155)和国防基础科研计划(批准号：B1520132018)资助的课题.* Project supported by the National Basic Research Program of China (Grant No.2013CB328904), the National Natural Science Foundation of China (Grant Nos.11105018,11305015,61201113,11475155), and the National Defense Basic Research Program of China (Grant No. B1520132018) （批准号:2013CB328904）
