Accession Number : ADA328800

Title :   Line Broadening Analysis of MPD Thrusters.

Descriptive Note : Master thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Bullard, William A., III

PDF Url : ADA328800

Report Date : MAR 1997

Pagination or Media Count : 101

Abstract : Spectroscopic analysis of the cathode jet of a model coaxial magneto-plasma dynamic (MPD) thruster is conducted to determine electron density and temperature downstream from the cathode. H(Beta) line profiles were scanned from an argon-hydrogen plasma generated in the cathode test facility of the NASA Jet Propulsion Laboratory in Pasadena, CA. A computer program was written in IDL to determine the profile Doppler and Stark half widths, which were used to determine temperature and electron density, respectively. Three sets of data from the cathode test facility were taken, while varying operating voltage, current, hydrogen/argon ratio, and pressure. Radial profiles for electron density and temperature were determined within the cathode jet. Generated plasmas ranged in electron density and temperature from approximately Ne = 2 x 10(14) cm(-3) at 5000 K (0.43 eV) to 4 x 10(14) cm(-3) at 15600 K (1.3 eV). It was determined that radial density and temperature distribution within the cathode jet are essentially uniform.

Descriptors :   *PLASMAS(PHYSICS), *ELECTRIC PROPULSION, *PLASMA ENGINES, MAGNETIC FIELDS, ELECTRON DENSITY, THESES, HYDROGEN, TEMPERATURE GRADIENTS, ELECTRON EMISSION, ARGON, THRUSTERS, STARK EFFECT, DOPPLER EFFECT, MAGNETOHYDRODYNAMICS, RADIAL FLOW, CATHODES(ELECTRON TUBES).

Subject Categories : Plasma Physics and Magnetohydrodynamics
      Electric and Ion Propulsion

Distribution Statement : APPROVED FOR PUBLIC RELEASE