Application of AF-NUMIT2 to the Modeling of Deep-Dielectric Spacecraft Charging in the Space Environment

Beecken, Brian P.; Englund, Joel T.; Lake, Jonathan James; Wallin, Bryan M.

doi:10.1109/tps.2015.2448413

Cited by 14 publications

(2 citation statements)

References 12 publications

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“…They did not exceed the claimed 5% stability. The dose depth deposition was rather non-uniform in line with literature data (see for example [22]). Evidently, this is a problem for RIC assessment and methods to circumvent it, and this will be discussed below.…”

Section: Methodssupporting

confidence: 81%

Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism

et al. 2019

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Polymer dielectrics subjected to intense radiation fluxes exhibit a radiation-induced conductivity (RIC). Polyimide is a good dielectric with excellent mechanical and thermal properties featuring high radiation resistance currently widely used in the spacecraft industry. Its RIC has been extensively studied in several laboratories. The purpose of the present study is to make a direct measurement of the RIC for both pulsed and continuous irradiation using a current sensing technique, which is contrary to the indirect method employing a surface-potential decay technique that is now preferred by spacecraft charging engineers. Our experiments are done in a small-signal regime excluding any recombination and dose effects. In combination with existing computer codes, we managed to develop further the conventional multiple trapping formalism and the RIC theory based on it. The main idea is to supplement an exponential trap distribution responsible for a dominant dispersive carrier transport in polymers with a small concentration of inherent deep traps which may or may not have an energy distribution. In line with this reasoning, we propose a tentative set of RIC model parameters for polyimide that accounts for the observed experimental data. The findings and their implications are discussed in a broad context of previous studies.

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Section: Methodssupporting

confidence: 81%

Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism

et al. 2019

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“…As a further test of the measurements and method, a simulation of the deposited charge distribution was determined with AF-NUMIT3, a deep dielectric charging code [14]. This can be seen as the narrower green distribution superimposed on the plot in figure 4.…”

Section: Resultsmentioning

confidence: 99%

A Simple Method for Determining Shallow Charge Distributions in Dielectrics via Pulsed Electroacoustic Measurements

Gibson

Dennison

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The understanding of charge dynamics in dielectric materials is paramount in mitigating electrostatic discharge events for spacecraft. The most critical spacecraft charging events are found to result from incident electrons in the energy range of 10 keV to 50 keV. The charge embedded in dielectric materials in this energy range are deposited a distance into the material on the order of a few to tens of microns. One way to measure and understand the deposited charge is via pulsed electroacoustic measurements (PEA). However, the typical PEA spatial resolution of ~ 10 μm is not sufficient to resolve or discern charge deposited at the lower end of this incident electron energy range, where deposited charge distributions are obscured by the superposition of the signal originating from induced mirror charge on the electrode of the pulsed electroacoustic system. A simple method is proposed and demonstrated in which reference measurements from a pristine sample are used to separate the effect of the induced mirror charge from the measured embedded charge to obtain a more accurate determination of the deposited charge distribution.

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Robust Simulation and Visualization of Satellite Orbit Tracking System

Ezzat

Mahdy

Hassanien

et al. 2018

Advances in Intelligent Systems and Computing

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Application of AF-NUMIT2 to the Modeling of Deep-Dielectric Spacecraft Charging in the Space Environment

Cited by 14 publications

References 12 publications

Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism

Time-Resolved Radiation-Induced Conductivity of Polyimide and Its Description Using the Multiple Trapping Formalism

A Simple Method for Determining Shallow Charge Distributions in Dielectrics via Pulsed Electroacoustic Measurements

Robust Simulation and Visualization of Satellite Orbit Tracking System

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