Parallel FDTD method, by setting resistors as lossy media across grids, is used in time-domain simulation of large vertically polarized electromagnetic pulse(EMP) radiating-wave simulator with discrete resistors. Radiation fields in time-domain with different load-type of discrete resistors are given. Effect of different resistor load is shown. Electric fields in time domain of simulator with discrete resistors and a cylinder effector are presented. It shows that loading discrete resistors improve effectively waveform of radiated electric fields by reducing reflection from simulator's top. However, radiation performance may be weaken as simulators with resistors load. Energy entering into the effector through a square hole is much as the side with hole is near to simulator and parallel with polarized orientation of simulator. The method has general application, and can be used in simulation of time-domain fields of other large vertically polarized EMP radiating-wave simulators with discrete resistors, including simulation of coupling fields as the ground and effectors existing.

Modeling of high-altitude electromagnetic pulse (HEMP) consists of one self-consistent process. Current density produced by Compton effects of gamma rays not only is the source in Maxwell's equation to produce electromagetic pulse, but also is influenced by electric fields. In this paper, analytical relation of Compton current and local electric field was deduced with reasonable hypotheses in one dimension model. It shows that self-consistent process is equivalent to an effective conductivity and can be combined with original non-self-consistent model. Analytical relation between Compton current and electric filed was verified using particle in cell and finite-difference time-domain methods. Finally, an example of HEMP environments calculated by this means was shown.