Journal article

Local transit-time damping of electrostatic wave packets

O Skjæraasen, A Melatos, PA Robinson, H Pécseli, J Trulsen

Physics of Plasmas | Published : 1999


The theory of local transit-time damping is generalized to coherent electrostatic wave packets with nonzero mean wave number in an unmagnetized plasma. A general analytic formula for the phase-averaged power dissipated locally within an arbitrary three-dimensional wave packet is derived to second order in the fields. This expression is evaluated explicitly for a representative one-dimensional field structure. The result agrees with independent numerical test-particle calculations to within numerical rounding errors for small to moderate field amplitudes, which justify the perturbation expansions. The resulting damping involves both Landau (resonant) and non-Landau (nonresonant) terms, the la..

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