Computer Science
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sct..conf..173g&link_type=abstract
Proceedings of the 6th Spacecraft Charging Conference. November 2-6, 1998. AFRL Science Center, Hanscom AFB, MA, USA., p.173-178
Computer Science
Scientific paper
The interactions of an electromagnetic (EM) wave propagating through plasma plumes of modern electric propulsion systems include both phase change and attenuation. Significant effects can exist even if the EM wave frequency is well above the local plasma frequency of the plume. Experimental measurements of spectral characteristics and theoretical analyses have shown that temporal responses modulate the EM wave by both amplitude and phase modulation. This paper will discuss the spectrums measured for Hall Thrusters (SPT-100, D-55, and UM P-5). The paper compares the measured spectrums of these thrusters to a calculated spectrum using ray tracing based on an axial and azimuthal model of density oscillation. It will be shown that an azimuthal model provides a better match to measured data, though more work needs to be done to experimentally show the existence of an azimuthal perturbation within the plume of a Hall thruster.
Carlson Douglas O.
Davis Christopher N.
Gallimore Alec D.
Gilchrist Brian E.
Ohler Shawn G.
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