The plasma wave echo revisited

Hou, Y. W.; Ma, Z. W.; Yu, M. Y.
January 2011
Physics of Plasmas;Jan2011, Vol. 18 Issue 1, p012108
Academic Journal
Temporal plasma wave echoes are investigated by solving the Vlasov-Poisson system numerically in detail. The time of appearance and the structure of the echoes, including that of the higher harmonics and the dependence on the time between the excitations, are found to agree well with that from theory and/or experiments. Although Landau damping strongly depends on the small number of in-phase (with the excited plasma waves) electrons, the latter do not noticeably affect echo formation even after they become trapped in the small but finite wave field. As expected, when one or both of the excitations become too strong, the number of trapped particles can become so large that the plasma echo ceases to exist.


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