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Short Haul Civil Tiltrotor Contingency Power System Preliminary DesignSingle Langmuir probe measurements are presented over a two-dimensional array of locations in the near Discharge Cathode Assembly (DCA) region of a 30-cm diameter ring cusp ion thruster over a range of thruster operating conditions encompassing the high-power half of the NASA throttling table. The Langmuir probe data were analyzed with two separate methods. All data were analyzed initially assuming an electron population consisting of Maxwellian electrons only. The on-axis data were then analyzed assuming both Maxwellian and primary electrons. Discharge plasma data taken with beam extraction exhibit a broadening of the higher electron temperature plume boundary compared to similar discharge conditions without beam extraction. The opposite effect is evident with the electron/ion number density as the data without began, extraction appears to be more collimated than the corresponding data with beam extraction. Primary electron energy and number densities are presented for one operating condition giving an order of magnitude of their value and the error associated with this calculation.
Document ID
20060006384
Document Type
Contractor Report (CR)
Authors
Eames, David J. H. (Rolls-Royce Allison Indianapolis, IN, United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 2006
Subject Category
Aircraft Propulsion and Power
Report/Patent Number
RDR-18694
NASA/CR-2006-214059
Funding Number(s)
CONTRACT_GRANT: NAS3-97029
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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