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Hollow cathode thrust mechanisms

Hollow cathode thrust mechanisms
Hollow cathode thrust mechanisms
This paper investigates propellant acceleration mechanisms within hollow cathode thrusters based on the results of previous experimental testing. Experiments were conducted on a T5, T6 and ¼ inch cathode. An indirect pendulum micro-thrust-balance was built for the measurement of thrust production in the T5, T6 cathodes while a hemispherical energy analyzer was used for ion energy measurements in the ¼ inch hollow cathode. The data suggest that the thrust mechanism of hollow cathodes is composed primarily of gas dynamic mechanisms, particularly as a result of an intense electron pressure at the cathode exit, and magneto-hydro-dynamic (MHD) forces at high currents and very low flow rates arising from the self-induced azimuthal magnetic field within the orifice. While this initial characterization can only loosely attribute the relative magnitude each mechanism plays it does show evidence for each. Smaller cathodes, such as the T5, operate at lower currents in a more arcjet like mode and show the necessary performance and efficiency to compete with conventional propulsion systems at a mission level.
hollow cathode thrust mechanisms, plasma, propulsion
American Institute of Aeronautics and Astronautics
Grubisic, Angelo
a4cab763-bbc0-4130-af65-229ae674e8c8
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259
Grubisic, Angelo
a4cab763-bbc0-4130-af65-229ae674e8c8
Gabriel, S.B.
ac76976d-74fd-40a0-808d-c9f68a38f259

Grubisic, Angelo and Gabriel, S.B. (2009) Hollow cathode thrust mechanisms. In Proceedings of the 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibition. American Institute of Aeronautics and Astronautics. 24 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper investigates propellant acceleration mechanisms within hollow cathode thrusters based on the results of previous experimental testing. Experiments were conducted on a T5, T6 and ¼ inch cathode. An indirect pendulum micro-thrust-balance was built for the measurement of thrust production in the T5, T6 cathodes while a hemispherical energy analyzer was used for ion energy measurements in the ¼ inch hollow cathode. The data suggest that the thrust mechanism of hollow cathodes is composed primarily of gas dynamic mechanisms, particularly as a result of an intense electron pressure at the cathode exit, and magneto-hydro-dynamic (MHD) forces at high currents and very low flow rates arising from the self-induced azimuthal magnetic field within the orifice. While this initial characterization can only loosely attribute the relative magnitude each mechanism plays it does show evidence for each. Smaller cathodes, such as the T5, operate at lower currents in a more arcjet like mode and show the necessary performance and efficiency to compete with conventional propulsion systems at a mission level.

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More information

Published date: 2 August 2009
Venue - Dates: 45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, , Denver, United States, 2009-08-01 - 2009-08-04
Keywords: hollow cathode thrust mechanisms, plasma, propulsion
Organisations: Aeronautics, Astronautics & Comp. Eng

Identifiers

Local EPrints ID: 72468
URI: http://eprints.soton.ac.uk/id/eprint/72468
PURE UUID: 8e62017d-fe74-4119-bc0d-d55b2cfc49c2

Catalogue record

Date deposited: 15 Feb 2010
Last modified: 07 Jan 2022 23:42

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Contributors

Author: Angelo Grubisic
Author: S.B. Gabriel

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