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  • 1970-1974  (21)
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Year
  • 1
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    Thrust measurements of a hollow-cathode discharge (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Thrust measurements of a hollow cathode mercury discharge were made with a synthetic mica target on a torsion pendulum. Thrust measurements were made for various target angles, tip temperatures, flow rates, keeper discharge powers, and accelerator electrode voltages. The experimental thrust data are compared with theoretical values for the case where no discharge power was employed.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-6705 , E-6691
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Optimization of electrostatic dual-grid beam-deflection system (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Tests were performed to minimize accelerator grid erosion of a 5-cm diameter Kaufman ion thruster due to direct beam impingement. Several different screen hole diameters, pillow-shape-square screen holes, and dished screen grids were tried. The optimization was accomplished by copper plating the accelerator grid before testing each grid configuration on a thruster for a 2-hour run. The thruster beam sputtered copper and molybdenum from the accelerator grid where the beam impinged. The observed erosion patterns and measured accelerator currents were used to determine how to modify the accelerator system. The lowest erosion was obtained for a 50-percent open area pillow-shape-square-aperture screen grid, dished 0.043 centimeter convex toward the accelerator grid, which was positioned with the center of the screen grid 0.084 centimeter from the accelerator grid. During this investigation the accelerator current was reduced from 120 to 55 microamperes and was also more uniformly distributed over the area of the accelerator grid.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TM-X-68096 , E-7012
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Beam focusing characteristics of variously shaped grid holes (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Beam focusing characteristics of variously shaped grid holes with application to electron bombardment ion thrustors
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TM-X-67922
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Status of a five-centimeter-diameter ion thruster technology program (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Prototype auxiliary propulsion subsystem with isolated single tank propellant feed system and 5-cm-diameter ion thruster
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TM-X-67828
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A 1000 hour endurance test of a glass-coated accelerator grid on a 15-centimeter-diameter Kaufman thruster (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Endurance test of glass coated accelerator grid on 15-centimeter-diameter Kaufman thruster
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TN-D-5891 , E-5393
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Electromagnetic flow rate meter (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A liquid metal, whose flow rate is to be determined, is directed through a chamber made of electrically-insulating material on which there is impressed a magnetic field perpendicular to the direction of flow of the liquid metal. The magnetic field is made to increase in strength in a downstream direction of the flow of liquid metal. At least a pair of electrodes are disposed in the chamber traversely and perpendicular to the direction of flow and an ammeter is connected between the electrodes. Electrodes may be disposed in the top or the bottom of the chamber and each may be segmented. Oppositely disposed electrodes may be used with at least one dividing wall extending from each electrode to cause reversal of the direction of flow of the liquid metal. The magnetic field may be provided by electromagnets or permanent magnets such as shaded pole permanent magnets.
    Keywords: GENERAL
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A sub-millipound mercury electron-bombardment thruster (1970)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Component tests of 5-cm diameter mercury electron- bombardment ion thrusters
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TM-X-52803 , PROPULSION JOINT SPECIALISTS CONF.; Jun 15, 1970 - Jun 19, 1970; SAN DIEGO, CA; UNITED STATES
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    NASA TECHNICAL REPORTS
  • 8
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    Design, fabrication, and operation of dished accelerator grids on a 30-cm ion thruster. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Several closely-spaced dished accelerator grid systems have been fabricated and tested on a 30-cm diameter mercury bombardment thruster and they appear to be a solution to the stringent requirements imposed by the near-term, high-thrust, low specific impulse electric propulsion missions. The grids were simultaneously hydroformed and then simultaneously stress relieved. The ion extraction capability and discharge chamber performance were studied as the total accelerating voltage, the ratio of net-to-total voltage, grid spacing, and dish direction were varied.
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 72-486 , American Institute of Aeronautics and Astronautics, Electric Propulsion Conference; Apr 17, 1972 - Apr 19, 1972; Bethesda, MD
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Design, fabrication, and operation of dished accelerator grids on a 30-cm ion thruster (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Several closely-space dished accelerator grid systems were fabricated and tested on a 30-cm diameter mercury bombardment thruster and they appear to be a solution to the stringent requirements imposed by the near-term, high-thrust, low specific impulse electric propulsion missions. The grids were simultaneously hydroformed and then simultaneously stress relieved. The ion extraction capability and discharge chamber performance were studied as the total accelerating voltage, the ratio of net-to-total voltage, grid spacing, and dish direction were varied.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-TM-X-68013 , E-6796 , Elec. Propulsion Conf.; Apr 17, 1972 - Apr 19, 1972; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Process for glass coating an ion accelerator grid Patent (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Helium outgassing process for fused glass coating on ion accelerator grid
    Keywords: MACHINE ELEMENTS AND PROCESSES
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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