Simulation of one-dimensional system generated electromagnetic pulse boundary layer
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摘要: 应用准第一性原理的PIC程序对系统电磁脉冲(SGEMP)一维边界层进行数值模拟，研究无限大介质板发射单一能量为2 keV、发射率为3.3×1020 m-2·s-1的光电子，发射角分布为余弦角分布，且平板上留下等量正电荷时的SGEMP效应，得出稳态后电子所能到达的最大距离约在5.8~7.5 cm之间振荡；发射表面z=0处的电荷密度在(6.0~9.0)×10－6 C/m3之间振荡；表面电场值在50~55 kV/m之间振荡；边界层达到准稳态的时间约为14.0 ns。将稳态模拟结果和理论估算结果进行对比，模拟结果较理论结果更加准确、形象地反映出SGEMP一维边界层的形成过程及稳态结构。Abstract: The one-dimensional system generated electromagnetic pulse(SGEMP) boundary layer is simulated by PIC code of quasi-first principle. The SGEMP effects of monoenergetic emission model are studied—the photoelectrons are emitted normally at 3.3×1020m-2·s-1 all with 2 keV energy from infinitely large dielectric plane while positive charges are left on the plane. When the steady state is reached, the maximum distance the electrons travel is oscillating between 5.8 cm and 7.5 cm, the charge density at z=0 is oscillating within (6.0-9.0)×10－6C/m3 and electric field at the surface is 50-55kV/m. The build-up time of quasi-steady state is 14.0 ns. The simulation results of steady state accord with the theoretic results, and the simulation results could image the forming process and the adiabatic oscillation of the steady state more clearly than the theoretic results. The modeling by PIC code to study SGEMP effects is validated.
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图 5 不同时刻的电荷密度沿z坐标分布图
Figure 5. Distribution of charge density along z-axis at different time
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