Accession Number:

ADA615897

Title:

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

Descriptive Note:

Final rept. 28 Apr 2011-21 Apr 2014

Corporate Author:

BETHEL UNIV SAINT PAUL MN

Personal Author(s):

Report Date:

2014-04-21

Pagination or Media Count:

58.0

Abstract:

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.

Subject Categories:

  • Computer Programming and Software
  • Electricity and Magnetism
  • Astronautics
  • Unmanned Spacecraft

Distribution Statement:

APPROVED FOR PUBLIC RELEASE