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    Ground-based plasma contractor characterization (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Presented are recent NASA Lewis Research Center (LeRC) plasma contractor experimental results, as well as a description of the plasma contractor test facility. The operation of a 24 cm diameter plasma source with hollow cathode was investigated in the lighted-mode regime of electron current collection from 0.1 to 7.0 A. These results are compared to those obtained with a 12 cm plasma source. Full two-dimensional plasma potential profiles were constructed from emissive probe traces of the contractor plume. The experimentally measured dimensions of the plume sheaths were then compared to those theoretically predicted using a model of a spherical double sheath. Results are consistent for currents up to approximately 1.0 A. For currents above 1.0 A, substantial deviations from theory occur. These deviations are due to sheath asphericity, and possibly volume ionization in the double-sheath region.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-100194 , E-3784 , NAS 1.15:100194
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Hall Thruster Technology for NASA Science Missions (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The performance of a prototype Hall thruster designed for Discovery-class NASA science mission applications was evaluated at input powers ranging from 0.2 to 2.9 kilowatts. These data were used to construct a throttle profile for a projected Hall thruster system based on this prototype thruster. The suitability of such a Hall thruster system to perform robotic exploration missions was evaluated through the analysis of a near Earth asteroid sample return mission. This analysis demonstrated that a propulsion system based on the prototype Hall thruster offers mission benefits compared to a propulsion system based on an existing ion thruster.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA/TM-2005-214020 , AIAA Paper 2005-3675 , E-15335 , 41st Joint Propulsion Conference and Exhibit; Jul 10, 2005 - Jul 13, 2005; Tucson, AZ; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Ground-based plasma contactor characterization (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper presents recent NASA Lewis Research Center plasma contactor experimental results, as well as a description of the plasma contactor test facility. The operation of a 24-cm-diameter plasma source with hollow cathode was investigated in the 'ignited-mode' regime of electron current collection from 0.1 to 7.0 A. These results are compared to those obtained with a 12-cm plasma source. Full two-dimensional plasma potential profiles were constructed from emissive probe traces of the contactor plume. The experimentally measured dimensions of the plume sheaths were then compared to those theoretically predicted, using a model of a spherical double sheath. Results are consistent for currents up to approximately 1.0 A. For currents above 1.0 A, substantial deviations from theory occur. These deviations are due to sheath asphericity, and, possibly, volume ionization in the double-sheath region.
    Keywords: PLASMA PHYSICS
    Type: Intl. Conference on Space Tethers for Science in the Space Station Era; Oct 04, 1987 - Oct 08, 1987; Venice; Italy
    Format: text
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    NASA TECHNICAL REPORTS
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