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  • 2000-2004
  • 1995-1999  (1)
  • 1990-1994  (2)
  • 1996  (1)
  • 1991  (1)
  • 1990  (1)
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  • 2000-2004
  • 1995-1999  (1)
  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Ambipolar magnetic fluctuation-induced heat transport in toroidal devices (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1999-2005 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The total magnetic fluctuation-induced electron thermal flux has been determined in the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 19, 131 (1991)] from the measured correlation of the heat flux along perturbed fields with the radial component of the perturbed field. In the edge region the total flux is convective and intrinsically ambipolar constrained, as evidenced by the magnitude of the thermal diffusivity, which is well approximated by the product of ion thermal velocity and the magnetic diffusivity. A self-consistent theory is formulated and shown to reproduce the experimental results, provided nonlinear charge aggregation in streaming electrons is accounted for in the theory. For general toroidal configurations, it is shown that ambipolar constrained transport applies when remote magnetic fluctuations (i.e., global modes resonant at distant rational surfaces) dominate the flux. Near locations where the dominant modes are resonant, the transport is nonambipolar. This agrees with the radial variation of diffusivity in MST. Expectations for the tokamak are also discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871996
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental simulation of a gaseous plasma collector (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 837-841 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogen plasma with a density of 3×1014 cm−3 and electron temperature of 20 eV is injected parallel to a 0.1 T B field, into hydrogen (and helium) neutral gas at 0.1–2 Torr. This plasma is opaque to molecular hydrogen but transparent to Franck–Condon neutrals. The axial density and temperature scale length increased with decreasing gas pressure but were insensitive to plasma density and axial magnetic field strength. The plasma decay is explained by radial ion diffusion resulting from collisions with fast neutrals while the fast neutral density is determined by the radial pressure balance between fast neutrals and the cold background gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859269
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental simulation of a gaseous divertor: Measurements of neutral density inside the plasma (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 834-837 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct measurements of the neutral density in the core of hydrogen plasma with a density of 3–4×1014 cm−3 and electron temperature of 15–20 eV in a magnetic field of 0.2 T, injected into hydrogen neutral gas at a pressure of 0.1–2 Torr are performed with plasma emission spectroscopy. The data are in agreement with the results of measured plasma decay [Phys. Fluids B 2, 837 (1990)] and can be explained by radial pressure balance between fast neutrals inside the plasma and cold background gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859878
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    Paper (German National Licenses)
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