Simulation of the SGEMP Response Inside the Cavity With Aperture

Abstract

In laser inertial confinement fusion facilities, the X-ray streak cameras and framing cameras are shielded by the structure of a cavity with aperture. The cavity is illuminated by the compound radiation environment composed of X-rays and electromagnetic pulses (EMPs). A complex EMP environment is generated by the multiphysical field interaction, which excites intense system-generated EMP (SGEMP) interference. Two cases are simulated to demonstrate the characteristics of the coupling field of external SGEMP and the complex EMP environment. The planes of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$z$ </tex-math></inline-formula> = 2.5 cm and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$z$ </tex-math></inline-formula> = 20 cm are selected to represent the area near and away from the aperture, respectively. The electric fields located at several positions along the axis or radius are output to depict the spatial distributions. The electric field waveform varies a lot and its peak keeps decreasing when away from the center of aperture. Finally, the waveform comparisons of the two cases indicate that the coupling field provides the governing contribution to the complex EMP environment.