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  • 1985-1989  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Self-consistent modification of a fast-tail distribution by resonant fields in nonuniform plasmas (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1471-1480 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analytic study is made of the second-order modifications produced on the fast-tail electron distribution function of a nonuniform plasma subjected to resonant excitation by wave sources. The source models considered can represent excitation by external electromagnetic waves propagating obliquely to the plasma density gradient, mode conversion of electrostatic whistlers, beat of two transparent electromagnetic waves, and direct conversion from ripples in the density profile. The calculation treats the Landau damping provided by fast-tail electrons self-consistently and is applicable to plasmas having a long density scale length L, i.e., (kDL)1/3 (very-much-greater-than)1, where kD is the Debye wavenumber of the warm background electrons. A threshold condition is found for the formation of a positive slope in the tail distribution by the various excitation mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866738
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Generation of Alfvén waves caused by thermal modulation of the electrical conductivity (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2458-2465 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analytic study is made of the effects produced by a localized modulation of the electrical conductivity of a magnetized plasma carrying a field-aligned current. The modulation is assumed to be caused by a heating source external to the plasma. The formulation used is applicable to modulation frequencies ω below the ion-cyclotron frequency ωci, and permits the calculation of the radiation pattern which contains shear as well as compressional Alfvén modes and near fields. For ω/ωci(very-much-less-than)1, the radiation appears primarily in the form of a highly collimated shear mode traveling along the field lines passing through the spot where the modulation occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865254
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Heating efficiency of beat-wave excitation in a density gradient (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 3807-3808 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple model is presented that yields analytical expressions for the heating efficiency of beat-wave excitation in a plasma with a linear density profile. The effect of self-consistent Landau damping by tail electrons is included without recourse to WKB approximations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866849
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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