Spatial Landau damping in plasmas with three-dimensional {kappa} distributions
- Laboratory for Solar and Space Physics, National Aeronautics and Space Administration, Goddard Space Flight Center, Code 612.2, Greenbelt, Maryland 20771 (United States)
The increase in linear Landau damping in {kappa}-distributed plasmas compared to thermal equilibrium plasmas is studied by solving a boundary value problem for the spatially damped plasma waves generated by a planar grid electrode with an applied time harmonic potential. Solutions are computed for the plasma potential versus the distance from the electrode for different values of the parameter {kappa} (kappa). The velocity parameter v{sub 0} of the distribution function is chosen so that, as the parameter {kappa} varies, the kinetic temperature of the plasma remains constant. The exact solutions of this problem are also compared to approximate solutions derived from the theory of normal modes, that is, from the roots of the dispersion relation. This model problem demonstrates the significant increase in Landau damping by electrons which occurs for small values of the parameter {kappa}.
- OSTI ID:
- 20722033
- Journal Information:
- Physics of Plasmas, Vol. 12, Issue 5; Other Information: DOI: 10.1063/1.1885474; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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