NDLI: High power ecr ion thruster discharge characterization

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High power ecr ion thruster discharge characterization

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kamhawi, Hani Haag Sr., Thomas Williams, George W. Carpenter, Christian Foster, John E.
Copyright Year	2006
Description	Electron cyclotron resonance (ECR) based ion thrusters with carbon based ion optics can potentially satisfy lifetime requirements for long duration missions (approximately 10 years) because grid erosion and cathode insert depletion issues are virtually eliminated. Though the ECR plasma discharge has been found to typically operate at slightly higher discharge losses than conventional DC ion thrusters (for high total thruster power applications), the discharge power fraction is small (less than 1 percent at 25 kW). In this regard, the benefits of increased life, low discharge plasma potentials, and reduced complexity are welcome tradeoffs for the associated discharge efficiency decrease. Presented here are results from discharge characterization of a large area ECR plasma source for gridded ion thruster applications. These measurements included load matching efficacy, bulk plasma properties via Langmuir probe, and plasma uniformity as measured using current probes distributed at the exit plane. A high degree of plasma uniformity was observed (flatness greater than 0.9). Additionally, charge state composition was qualitatively evaluated using emission spectroscopy. Plasma induced emission was dominated by xenon ion lines. No doubly charged xenon ions were detected.
File Size	1077960
Page Count	30
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20060008936
Archival Resource Key	ark:/13960/t1vf1sx85
Language	English
Publisher Date	2006-02-01
Access Restriction	Open
Subject Keyword	Spacecraft Propulsion And Power Characterization Plasma Jets Plasma Potentials Electron Cyclotron Resonance Xenon Ion Engines Electron Energy Charged Particles Current Density Microwaves Ion Optics Electrostatic Probes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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