|Título||Collisional damping rates for plasma waves
Ferrão, Sabrina Tigik
Ziebell, Luiz Fernando
Yoon, Peter H.
|Abstract||The distinction between the plasma dynamics dominated by collisional transport versus collective processes has never been rigorously addressed until recently. A recent paper [P. H. Yoon et al., Phys. Rev. E 93, 033203 (2016)] formulates for the first time, a unified kinetic theory in which collective processes and collisional dynamics are systematically incorporated from first principles. One of the outcomes of such a formalism is the rigorous derivation of collisional damping rates for Langmuir and ion-acoustic waves, which can be contrasted to the heuristic customary approach. However, the results are given only in formal mathematical expressions. The present brief communication numerically evaluates the rigorous collisional damping rates by considering the case of plasma particles with Maxwellian velocity distribution function so as to assess the consequence of the rigorous formalism in a quantitative manner. Comparison with the heuristic (“Spitzer”) formula shows that the accurate damping rates are much lower in magnitude than the conventional expression, which implies that the traditional approach over-estimates the importance of attenuation of plasma waves by collisional relaxation process. Such a finding may have a wide applicability ranging from laboratory to space and astrophysical plasmas.
|Contido em||Physics of plasmas. Melville. Vol. 23, no. 6 (Jun. 2016), 064504, 5 p.
Ondas de Langmuir em plasmas
Ondas íon-acústicas em plasmas
Processos de colisao em plasmas
|Tipo||Artigo de periódico
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