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  • Other Sources  (3)
  • 1985-1989  (3)
  • 1988  (3)
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  • 1985-1989  (3)
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  • 1
    Publication Date: 2019-06-28
    Description: Presented are performance data for laboratory and engineering model 30 cm-diameter ion thrusters operated with xenon propellant over a range of input power levels from approximately 2 to 20 kW. Also presented are preliminary performance results obtained from laboratory model 50 cm-diameter cusp- and divergent-field ion thrusters operating with both 30 cm- amd 50 cm-diameter ion optics up to a 20 kW input power. These data include values of discharge chamber propellant and power efficiencies, as well as values of specific impulse, thruster efficiency, thrust and power. The operation of the 30 cm- and 50 cm-diameter ion optics are also discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-101292 , E-4272 , NAS 1.15:101292 , AIAA PAPER 88-2914
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-28
    Description: Presented are performance data for laboratory and engineering model 30 cm-diameter ion thrusters operated with xenon propellant over a range of input power levels from approximately 2 to 20 kW. Also presented are preliminary performance results obtained from laboratory model 50 cm-diameter cusp- and divergent-field ion thrusters operating with both 30 cm- and 50 cm-diameter ion optics up to a 20 kW input power. These data include values of discharge chamber propellant and power efficiencies, as well as values of specific impulse, thruster efficiency, thrust and power. The operation of the 30 cm- and 50 cm-diameter ion optics are also discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 88-2914
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  • 3
    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
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