Development and Application of NUMIT for Realistic Modeling of Deep-Dielectric Spacecraft Charging in the Space Environment

NUMIT has been refined, developed, and greatly enhanced so that it can be used to model and predict the deep charging of dielectrics on spacecraft. The new tool, called AF-NUMIT2, can now model isotropically incident electron fluxes from realistic energy spectra that change with time. The model has...

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Bibliographic Details
Main Author: Beecken, Brian P
Format: Report
Language:English
Subjects:
Astronautics
CHARGE TRANSFER
CHARGE TRANSPORT ALGORITHM
Computer Programming and Software
COMPUTERIZED SIMULATION
CRRES(COMBINED RELEASE AND RADIATION EFFECTS SATELLITE)
DEEP-DIELECTRIC CHARGING
DIELECTRICS
ELECTRIC FIELDS
ELECTRICAL CONDUCTIVITY
Electricity and Magnetism
ELECTRON FLUX
FIELD INTENSITY
ISOTROPISM
MATHEMATICAL MODELS
MODELING CHARGING
MONTE CARLO METHOD
NUMIT(NUMERICAL ITERATIONS)
PE63401F
POLYMERIZATION
SOFTWARE TOOLS
SPACE ENVIRONMENTS
SPACE TECHNOLOGY
SPACECRAFT CHARGING
SPECTRA
SYNCHRONOUS SATELLITES
Unmanned Spacecraft
WUAFRLEF004167
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Description
Summary:NUMIT has been refined, developed, and greatly enhanced so that it can be used to model and predict the deep charging of dielectrics on spacecraft. The new tool, called AF-NUMIT2, can now model isotropically incident electron fluxes from realistic energy spectra that change with time. The model has been extended to incident electron fluxes an order of magnitude lower than before (less than = 10 keV), and aspects of the model have been checked against Monte Carlo simulations. Electron energy flux spectra, as measured by CRRES, have been used in dozens of simulations of Kapton charging over multiple days. Kapton has been modeled with both dark conductivities and radiation induced conductivities extending over two orders-of-magnitude. The result is a surprisingly consistent relationship between maximum internal electric field strengths and conductivity, regardless of the particular incident electron spectra. The original document contains color images.