Accession Number:

ADA609812

Title:

Materials Analysis of Transient Plasma-Wall Interactions

Descriptive Note:

Final rept. 15 Jun 2011-14 Mar 2014

Corporate Author:

WASHINGTON UNIV SEATTLE DEPT OF AERONAUTICS AND ASTRONAUTICS

Report Date:

2014-05-13

Pagination or Media Count:

28.0

Abstract:

This program seeks to advance the field of high temperature materials, space propulsion and electro-energetic physics research. With the discovery of a new class of electromagnetic pulsed plasma propulsion devices such as the Electrodeless Lorentz Force Thruster, it is critical to characterize and develop and new materials for these systems. Through a combination of experiment and surface analysis, the behavior of the plasma-material boundary under transient thermal convective and radiative loads was investigated. Specifically, transient non-equilibrium plasma flows have been produced over a range of high energy densities 100 kJsq m - 500 kJsq m, on time scales of 10s of microseconds. The initial investigations employed deuterium plasmas to reduce the effect of radiation effects while providing for a chemically active species whose effect on the substrate could easily be traced. The chemical and physical effects of these flows on a range of insulative, conducting and composite materials were examined by detailed surface analysis on the micro, meso and macro scale. The information obtained through Optical Microscopy, Secondary Electron Microscopy, and X-ray Photoelectron Spectroscopy were used to develop a model showing the importance sputter and re-deposition.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE