Effects of ion motion on linear Landau damping

Xu, Hui and Sheng, Zheng-Ming and Kong, Xiang-Mu and Su, Fu-Fang (2017) Effects of ion motion on linear Landau damping. Physics of Plasmas, 24 (2). 022101. ISSN 1070-664X (https://doi.org/10.1063/1.4975020)

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The effects of ion motion on Landau damping has been studied by the use of one-dimensional Vlasov-Poisson simulation. It is shown that the ion motion may significantly change the development of the linear Landau damping. When the ion mass is multiple of proton mass, its motion will halt the linear Landau damping at some time due to the excitation of ion acoustic waves. The latter will dominate the system evolution at the later stage and hold a considerable fraction of the total energy in the system. With very small ion mass, such as in electron-positron plasma, the ion motion can suppress the linear Landau damping very quickly. When the initial field amplitude is relatively high such as with the density perturbation amplitude δn/n0 > 0.1, the effect of ion motion on Landau damping is found to be weak or even ignorable.