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Title: Experimental Studies of Anode Sheath Phenomena in a Hall Thruster Discharge

Abstract

Both electron-repelling and electron-attracting anode sheaths in a Hall thruster were characterized by measuring the plasma potential with biased and emissive probes [L. Dorf, Y. Raitses, V. Semenov, and N.J. Fisch, Appl. Phys. Let. 84 (2004) 1070]. In the present work, two-dimensional structures of the plasma potential, electron temperature, and plasma density in the near-anode region of a Hall thruster with clean and dielectrically coated anodes are identified. Possible mechanisms of anode sheath formation in a Hall thruster are analyzed. The path for current closure to the anode appears to be the determining factor in the anode sheath formation process. The main conclusion of this work is that the anode sheath formation in Hall thrusters differs essentially from that in the other gas discharge devices, like a glow discharge or a hollow anode, because the Hall thruster utilizes long electron residence times to ionize rather than high neutral pressures.

Authors:
; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., Princeton, NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
836481
Report Number(s):
PPPL-4030
TRN: US0500613
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 17 Dec 2004
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANODES; CLOSURES; ELECTRON TEMPERATURE; ELECTRONS; GLOW DISCHARGES; PLASMA DENSITY; PLASMA POTENTIAL; PROBES; THRUSTERS; ELECTRIC PROPULSION; PLASMA-WALL; INTERACTION; SHEATH

Citation Formats

L. Dorf, Y. Raitses, and N.J. Fisch. Experimental Studies of Anode Sheath Phenomena in a Hall Thruster Discharge. United States: N. p., 2004. Web. doi:10.2172/836481.
L. Dorf, Y. Raitses, & N.J. Fisch. Experimental Studies of Anode Sheath Phenomena in a Hall Thruster Discharge. United States. doi:10.2172/836481.
L. Dorf, Y. Raitses, and N.J. Fisch. Fri . "Experimental Studies of Anode Sheath Phenomena in a Hall Thruster Discharge". United States. doi:10.2172/836481. https://www.osti.gov/servlets/purl/836481.
@article{osti_836481,
title = {Experimental Studies of Anode Sheath Phenomena in a Hall Thruster Discharge},
author = {L. Dorf and Y. Raitses and N.J. Fisch},
abstractNote = {Both electron-repelling and electron-attracting anode sheaths in a Hall thruster were characterized by measuring the plasma potential with biased and emissive probes [L. Dorf, Y. Raitses, V. Semenov, and N.J. Fisch, Appl. Phys. Let. 84 (2004) 1070]. In the present work, two-dimensional structures of the plasma potential, electron temperature, and plasma density in the near-anode region of a Hall thruster with clean and dielectrically coated anodes are identified. Possible mechanisms of anode sheath formation in a Hall thruster are analyzed. The path for current closure to the anode appears to be the determining factor in the anode sheath formation process. The main conclusion of this work is that the anode sheath formation in Hall thrusters differs essentially from that in the other gas discharge devices, like a glow discharge or a hollow anode, because the Hall thruster utilizes long electron residence times to ionize rather than high neutral pressures.},
doi = {10.2172/836481},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {12}
}