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  • PLASMA PHYSICS  (2)
  • 1990-1994
  • 1975-1979  (2)
  • 1965-1969
  • 1978  (2)
  • 1965
  • 1
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    Low-frequency fluctuation spectra and associated particle transport in the NASA Lewis bumpy-torus plasma (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The strong radial electric field associated with the Penning discharge and the strong toroidal magnetic field give rise to a diversity of E/B phenomena, such as rotating waves and spokes, which in turn manifest themselves as space-time fluctuations of the plasma density and potential. Work is done to further understand the nature and origin of the fluctuations and their connection with fluctuation-induced transport. The approach is to monitor the density and potential fluctuations; to digitize the data; and to generate, with the aid of a computer, various spectral properties by means of the fast fourier transform. Of particular interest is the computer-generated transport spectrum that indicates in a quantitative way which fluctuation spectral components contribute to transport and which do not. All experimental measurements of the spectral characteristics of the plasma are given in absolute units rather than as relative values. Preliminary measurements of the transport spectrum of the ion population are given, and it is shown that the fluctuation-induced transport is in order-of-magnitude agreement with that inferred from the steady state current flowing to the electrodes that generate the plasma.
    Keywords: PLASMA PHYSICS
    Type: NASA-TP-1258 , E-9565
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A fluctuation-induced plasma transport diagnostic based upon fast-Fourier transform spectral analysis (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A diagnostic, based on fast Fourier-transform spectral analysis techniques, that provides experimental insight into the relationship between the experimentally observable spectral characteristics of the fluctuations and the fluctuation-induced plasma transport is described. The model upon which the diagnostic technique is based and its experimental implementation is discussed. Some characteristic results obtained during the course of an experimental study of fluctuation-induced transport in the electric field dominated NASA Lewis bumpy torus plasma are presented.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-78932 , E-9675 , Intern. Conf. on Plasma Sci.; May 15, 1978 - May 18, 1978; Monterey, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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