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  • 1
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    Spectroscopic determination of electron temperature and percentage ionization in a helium plasma. (1964)
    In:  Other Sources
    Details
    Publication Date: 2011-08-10
    Description: Spectroscopic determination of electron temperature and percentage ionization in helium plasma
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The effects of cascading and metastable atoms on the determination of electron temperature from relative line intensities in a tenuous helium plasma. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Cascading and electron-metastable atom interactions effects on electron temperature determination from spectral lines of helium plasma
    Keywords: PHYSICS, PLASMA
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A study of the axial velocities in an ammonia MPD thruster. (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Axial velocities in ammonia MPD thrustor exhaust by measuring Doppler shifts of spectral lines emitted by plasma constituents
    Keywords: PROPULSION SYSTEMS
    Type: ; ADEMIE DES SCIENCES
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Energy required for ion production by electron bombardment in helium, argon, and cesium. (1964)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Energy cost of ion production for atomic helium, argon and cesium calculated by excitation and ionization cross sections
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
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    NASA TECHNICAL REPORTS
  • 5
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    Historical perspectives - The role of the NASA Lewis Research Center in the national space nuclear power programs (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The history of the NASA Lewis Research Center's role in space nuclear power programs is reviewed. Lewis has provided leadership in research, development, and the advancement of space power and propulsion systems. Lewis' pioneering efforts in nuclear reactor technology, shielding, high temperature materials, fluid dynamics, heat transfer, mechanical and direct energy conversion, high-energy propellants, electric propulsion and high performance rocket fuels and nozzles have led to significant technical and management roles in many natural space nuclear power and propulsion programs.
    Keywords: GENERAL
    Type: AIAA PAPER 91-3462
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Dynamic Conversion Working Group Summary (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: The potential of dynamic conversion devices for use in solar and nuclear dynamic space power systems was addressed. Conversion systems considered were based on the use of Brayton, Stirling and Rankine cycles. Both organic and liquid metal Rankine cycles were included. The basic system considerations were: mission requirements, system attributes, system options, technology issues and constraints, and priorities of needed technology development. Mission requirements, where dynamic conversion was considered enabling technology, were identified along with the associated power levels and potential energy sources. When considering the system options special attention was given to recommend operating temperatures and other significant discriminators. A list of prioritized tasks considered important for the successful development of dynamic conversion systems for 1995 and beyond was compiled.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Lewis Research Center Space Power; p 297-299
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    NASA TECHNICAL REPORTS
  • 7
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    Effects of metastable atoms on volume ion production in a tenuous helium plasma (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Excitation and ionization cross sections used to calculate effect of electron-metastable atom interactions on volume ion production processes in steady state helium plasma
    Keywords: PHYSICS, PLASMA
    Type: NASA-TN-D-3121
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Nuclear power systems for lunar and Mars exploration (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Initial studies of a variety of mission scenarios for the new Space Exploration Initiative, and the technologies necessary to enable or significantly enhance them, have identified the development of advanced space power systems whether solar, chemical or nuclear to be of prime importance. Lightweight, compact, reliable power systems for planetary rovers and a variety of surface vehicles, utility surface power, and power for advanced propulsion systems have been identified as critical needs for these missions. These mission scenarios, the concomitant power system requirements, and the power system options considered are discussed. The significant potential benefits of nuclear power are identified for meeting the power needs of the above applications.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IAF PAPER 90-200
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Comparative analysis of the conceptual design studies of potential early commercial MHD power plants (CSPEC) (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A conceptual design study of the MHD/steam plant that incorporates the use of oxygen enriched air preheated in a metallic heat exchanger as the combustor oxidant showed that this plant is the most attractive for early commercial applications. The variation of performance and cost was investigated as a function of plant size. The contractors' results for the overall efficiencies are in reasonable agreement considering the slight differences in their plant designs. NASA LeRC is reviewing cost and performance results for consistency with those of previous studies, including studies of conventional steam plants. LeRC in house efforts show that there are still many tradeoffs to be considered for these oxygen enriched plants and considerable variations can be made in channel length and level of oxygen enrichment with little change in overall plant efficiency.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-82897 , DOE/NASA/10769-26 , NAS 1.15:82897
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Hall current effects in the Lewis magnetohydrodynamic generator (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Data obtained in a magnetohydrodynamic generator are compared with theoretical values calculated by using the Dzung theory. The generator was operated with cesium-seeded argon as the working fluid. The gas temperature varied from 1800 to 2100 K, the gas pressure from 19 to 22 N/sq cm, the Mach number from 0.3 to 0.5, and the magnetic field strength from 0.2 to 1.6 T. The analysis indicates that there is incomplete seed vaporization and that Hall current shorting paths (through the working fluid to ground at both the entrance and exit of the channel) limit generator performance.
    Keywords: PHYSICS, PLASMA
    Type: NASA-TM-X-2606 , E-6924
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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