Advanced Electrodynamic Tether Systems: Modeling of Scattering and Unsteady Effects

This work addresses the needs for advanced computational tools and theoretical models devoted to the study of two interrelated topics of interest to the Air Force Radiation Belt Remediation RBR and potential use of tethers as low frequency oscillatorsradiators. Both problems stretch the capabilities of existing numerical methods, while connecting with a body of previous work on probe theory, spacecraft-plasma interactions and electrodynamic tether propulsion. The Electrostatic RBR application would typically require MV-level potentials and complex, multi-strand wire arrangements. The high voltages imply extreme disparity of length scales, as well as relativistic conditions in some cases. The geometrical complexity and driving physical processes may require 3D capabilities, particularly when magnetic effects cannot be ignored. For its part, the study of sheath ion or electron oscillations in the vicinity of a high power radiating tether requires tracking of a time-dependent sheath boundary and use of boundary conditions that allow radiation escape while denying spurious reflections.