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  • 1
    Electronic Resource
    Electronic Resource
    Effect of object potentials on the wake of a flowing plasma (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 2675-2679 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements and calculations have been carried out to determine the structure of electric potential and ion density in the near wake created by the flow of a high-Mach-number plasma past a conducting plate biased with respect to the undisturbed plasma. Results are obtained for a molecular nitrogen plasma with ambient electron densities N of the order of 105 cm−3, ion temperatures of θi(approximately-equal-to)0.025 eV, electron temperatures of θ∼0.3 eV, and plasma flow velocities of V0(approximately-equal-to)106 cm/s, corresponding to V0/(θ/M)1/2(approximately-equal-to)11. For high-Mach-number flow past an unbiased object, the wake structure is very nearly that predicted for the expansion of an initially uniform plasma half-space into vacuum; in this case there is a sharply defined ion front moving under the influence of an electric field produced by charge separation between ions and electrons near the front. With bias potential φp such that qφp/θ is in the range −1 to −10, a well-defined ion front still exists, but its motion is strongly affected by the imposed potential. This effect can be explained in terms of the impulse received by those ions passing through the sheath region near the plate edge. Two-dimensional simulations of the laboratory experiments were performed by using a multiple waterbag technique. The results for both zero and finite ion temperatures are almost noise-free and support the approximate analytical model. The calculated density for 10 θ negative bias on the plate is compared with the measured profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339418
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Instrument for differential ion flux vector measurements on Spacelab 2 (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1897-1902 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The differential ion flux probe (DIF probe) is a scientific instrument capable of deconvolving a multiplicity of ion streams, differing in flow direction and/or energy, and independently determining the flow direction, current density, temperature, and energy of each stream. The original instrument concept was developed for laboratory investigations in the area of plasma dynamics and was reported [N. H. Stone, Rev. Sci. Instrum. 48, 1458 (1977). Since then, the DIF probe has been redesigned and developed into a flight instrument to provide measurements of disturbed plasma flow conditions within the terrestrial ionosphere. It has flown on the STS-3 Space Shuttle mission, on sounding rockets, and recently on the Spacelab-2 mission as part of the plasma diagnostics package (PDP) experiment. Herein, we discuss the unique design and operational characteristics required for the flight model of the DIF probe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138441
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Does a ‘two-stream’ flow model apply to wakes of large bodies in space? (1974)
    Springer
    Astrophysics and space science 31 (1974), S. L1 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Structural patterns of ion and electron currents observed on the wake axes of the Ariel J and the Gemini 10 space vehicles are re-examined, together with relevant theoretical and laboratory ‘simulation’, studies. Some insight into existingin-situ data is provided. The possibility that ‘converging-stream’ models describe structural features of current enhancements in the wake region of large spacecraft is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642618
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    Paper (German National Licenses)
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