Numerical Simulation of SGEMP Generated by X-Rays From High-Altitude Nuclear Detonations

In this work, the system generated electromagnetic pulse (SGEMP) generated by the X-rays from high-altitude nuclear detonation (HAND) is investigated by numerical simulation. First, based on the mass attenuation coefficients, the spatial distributions of energy fluence, spectrum, and energy deposition of the X-rays propagating in air are calculated, as well as the number density of preionized air. Then, the photon–electron transport between the attenuated X-rays and the metal surface is simulated using the Monte Carlo method. Finally, the SGEMP of a metal cylinder is calculated based on the particle-in-cell (PIC) method. The results show that the electric field close to the irradiated surface consists of a short positive pulse with high intensity and a long negative pulse with low intensity. The magnitude of the electromagnetic field increases upon increasing yield of burst, while decreases upon increasing explosion height and distance from the burst point.