A Modified and Calibrated Drift-Diffusion-Reaction Model for Time-Domain Analysis of Charging Phenomena in Electron-Beam Irradiated Insulators

TL;DR

This paper introduces an enhanced drift-diffusion-reaction model for insulator charging under electron-beam irradiation, incorporating new boundary conditions and dynamic mechanisms to improve long-term accuracy and match experimental data.

Contribution

The paper develops a calibrated, physically consistent model that accurately predicts long-term charging phenomena in insulators under electron-beam exposure.

Findings

Model reproduces experimental yield-energy curves.

Analyzes long-time charging under various beam conditions.

Improves physical realism at extended time scales.

Abstract

This paper presents an improved version of the previously proposed self-consistent drift-diffusion-reaction model correcting for non-physical behavior at longer time scales. To this end a novel boundary condition is employed that takes into account the effect of tertiary electrons and a fully dynamic trap-assisted generation-recombination mechanism is implemented. Sensitivity of the model with respect to material parameters is investigated and a calibration procedure is developed that reproduces experimental yield-energy curves for uncharged insulators. Long-time charging and yield variations are analyzed for stationary defocused and focused beams as well as moving beams dynamically scanning composite insulators.