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Content Provider | IEEE Xplore Digital Library |
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Author | Smith, T.B. Tang, R. Nguyen, S. Gallimore, A.D. |
Copyright Year | 2006 |
Description | Author affiliation: Michigan Univ., Ann Arbor, MI (Smith, T.B.; Tang, R.; Nguyen, S.; Gallimore, A.D.) |
Abstract | Summary form only given. Conventional BaO hollow cathodes used for satellite electric propulsion suffer from two major failure modes: emitter poisoning and heater failure. Lanthanum hexaboride (LaB6 ) hollow cathodes are two orders of magnitude less sensitive to emitter poisoning, but require higher operating temperatures to attain similar emission current densities. As a result, higher heater currents are required to start a self-sustaining discharge, leading to thermal degradation of the heater insulation. Heaterless designs exist for BaO hollow cathodes, but not for $LaB_{6}.$ As a first step toward development of a heaterless $LaB_{6}$ hollow cathode, we present results from a series of breakdown and ignition experiments with a LaB $_{6}$ hollow cathode. This Moscow Aviation Institute (MAI) cathode design can maintain a self sustaining discharge at currents above 6 A. Disappearing wire pyrometry permits measurement of the pre-ignition $LaB_{6}$ insert temperature as a function of the heater filament current and voltage. We plot breakdown voltage and discharge current growth (or decay) rates as a function of heater power and xenon mass flow rate. Heaterless breakdown voltage measurements as a function of xenon mass flow rate provide Paschen curves for the MAI electrode configuration. These results permit initial modeling of the insert thermal balance and the cathode breakdown characteristics, permitting semi-empirical design of a followon prototype heaterless LaB $_{6}$ cathode |
Sponsorship | Plasma Sci. and Applications Comm. IEEE Nuclear and Plasma Sci. Soc |
Starting Page | 145 |
Ending Page | 145 |
File Size | 141346 |
Page Count | 1 |
File Format | |
ISBN | 1424401259 |
DOI | 10.1109/PLASMA.2006.1707017 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2006-06-04 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Electric breakdown Ignition Cathodes Xenon Satellites Propulsion Resistance heating Lanthanum Temperature sensors Current density |
Content Type | Text |
Resource Type | Article |
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