Operation of a Segmented Hall Thruster with Low-sputtering Carbon-velvet Electrodes

Raitses, Y. ; Staack, D. ; Dunaevsky, A. ; Fisch, N.J.

Princeton University. Plasma Physics Laboratory.

关键词: Magnetic Fields;    Electrodes;    70 Plasma Physics And Fusion Technology;    Carbon Fibers;    Thrusters Carbon Fibres, Plasma Magnetohydrodynamics, Sputtering, Electrodes, Arcs (Electric), Plasma-Wall Interactions;   

DOI  :  10.2172/934607
RP-ID  :  PPPL-4136
RP-ID  :  DE-AC02-76CH03073
RP-ID  :  934607

美国|英语

来源: UNT Digital Library

【 摘 要 】

Carbon fiber velvet material provides exceptional sputtering resistance properties exceeding those for graphite and carbon composite materials. A 2 kW Hall thruster with segmented electrodes made of this material was operated in the discharge voltage range of 200–700 V. The arcing between the floating velvet electrodes and the plasma was visually observed, especially, during the initial conditioning time, which lasted for about 1 h. The comparison of voltage versus current and plume characteristics of the Hall thruster with and without segmented electrodes indicates that the magnetic insulation of the segmented thruster improves with the discharge voltage at a fixed magnetic field. The observations reported here also extend the regimes wherein the segmented Hall thruster can have a narrower plume than that of the conventional nonsegmented thruster.