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Hybrid-Particle-In-Cell Simulation of Backsputtered Carbon Transport in the Near-Field Plume of a Hall ThrusterMagnetic shielding has eliminated boron nitride erosion as the life limiting mechanism in a Hall thruster but has resulted in erosion of the front magnetic field pole pieces. Recent experiments show that the erosion of graphite pole covers, which are added to protect the magnetic field pole pieces, causes carbon to redeposit on other surfaces, such as boron nitride discharge channel and cathode keeper surfaces. As a part of the risk-reduction activities for Advanced Electric Propulsion System thruster development, this study models transport of backsputtered carbon from the graphite front pole covers and vacuum facility walls. Fluxes, energy distributions, and redeposition rates of backsputtered carbon on the anode, discharge channel, and graphite cathode keeper surfaces are predicted.
Document ID
20180001489
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Choi, Maria (NASA Glenn Research Center Cleveland, OH, United States)
Yim, John T. (NASA Glenn Research Center Cleveland, OH, United States)
Williams, George J. (NASA Glenn Research Center Cleveland, OH, United States)
Herman, Daniel A. (NASA Glenn Research Center Cleveland, OH, United States)
Gilland, James H. (Ohio Aerospace Inst. Brook Park, OH, United States)
Date Acquired
February 27, 2018
Publication Date
February 1, 2018
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
E-19447
GRC-E-DAA-TN48798
IEPC-2017-537
NASA/TM-2018-219719
Meeting Information
Meeting: International Electric Propulsion Conference
Location: Atlanta, GA
Country: United States
Start Date: October 8, 2017
End Date: October 12, 2017
Sponsors: NASA Headquarters
Funding Number(s)
WBS: WBS 729200.01.03
Distribution Limits
Public
Copyright
Public Use Permitted.

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