Increased Landau damping of electrostatic waves in the presence of low density suprathermal electron populations is examined. An electrostatic dispersion analysis is compared directly with one-dimensional particle-in-cell simulations of the Landau damping rates. An analytic damping rate formula is presented that is in good agreement with numerical solutions of the dispersion equation over a range of parameters. (C) 2005 American Institute of Physics.
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