NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsLong Duration Wear Test of the NASA HERMeS Hall ThrusterThe NASA Hall Effect Rocket with Magnetic Shielding (HERMeS) 12.5-kW Hall thruster is the subject of extensive technology maturation by NASA GRC (Glenn Research Center) and JPL (Jet Propulsion Laboratory) in preparation for development into a flight propulsion system. As part of this on-going effort, a series of three wear tests have been conducted to identify erosion phenomena and the accompanying failure modes as well as to validate service-life models for magnetically-shielded thrusters. This paper presents an overview and summary of the results obtained over the first 1715 hours of the third wear test, which has the overall goal of serving as a pathfinder to identify and correct design or facility issues prior to the flight qualification campaign. Overall, negligible changes in performance and stability are observed as a function of operating time as well as relative to previous wear tests. Erosion of the inner and outer front pole covers is shown to vary by 76-300 percent as a function of discharge voltage and by up to 40 percent as a function of magnetic field strength. Shifting the cathode position upstream relative to the pole covers is shown to reduce keeper erosion rates by 84 percent, which supports this approach for mitigating the elevated keeper wear observed during previous wear tests.Document ID20180006433Acquisition SourceGlenn Research CenterDocument TypeTechnical Memorandum (TM)AuthorsFrieman, Jason D.*(NASA Glenn Research Center Cleveland, OH, United States)*Kamhawi, Hani*(NASA Glenn Research Center Cleveland, OH, United States)*Williams, George J.*(NASA Glenn Research Center Cleveland, OH, United States)*Huang, Wensheng*(NASA Glenn Research Center Cleveland, OH, United States)*Herman, Daniel A.*(NASA Glenn Research Center Cleveland, OH, United States)*Peterson, Peter Y.*(Vantage Partners, LLC Brook Park, OH, United States)*Gilland, James H.*(Ohio Aerospace Inst. Brook Park, OH, United States)*Hofer, Richard R.*(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)*Date AcquiredOctober 18, 2018Publication DateAugust 1, 2018Subject CategorySpacecraft Propulsion And PowerReport/Patent NumberGRC-E-DAA-TN59240AIAA Paper 2018-4645NASA/TM-2018-219960E-19570Meeting InformationMeeting: AIAA, SAE and ASEE Joint Propulsion ConferenceLocation: Cincinnati, OHCountry: United StatesStart Date: July 9, 2018End Date: July 11, 2018Sponsors:American Society for Electrical Engineers,Society of Automotive Engineers, Inc.,American Institute of Aeronautics and Astronautics (AIAA)Funding Number(s)WBS: WBS 729200.01.03CONTRACT_GRANT: NNC12BA01BCONTRACT_GRANT: NNN12AA01CDistribution LimitsPublicCopyrightPublic Use Permitted.Available DownloadsNameType20180006433.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsIDRelationTitle20180007405See AlsoLong Duration Wear Test of the NASA HERMeS Hall Thruster20180005325See AlsoLong Duration Wear Test of the NASA HERMeS Hall Thrustervisibility_offNo Preview Available
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