Large amplitude solitary waves in ion-beam plasmas with charged dust impurities

Details Large amplitude solitary waves in ion-beam plasmas with charged dust impurities Large amplitude solitary waves in ion-beam plasmas with charged dust impurities

2011-11-11

arxiv.org/abs/1111.2698v2

Phys. Plasmas 18, 122112 (2011)

Physics

Plasma Physics

8 pages, 6 figures; Article to appear in Phys. Plasmas (2011)

Scientific paper

10.1063/1.3671951

The nonlinear propagation of large amplitude dust ion-acoustic (DIA) solitary waves (SWs) in an ion-beam plasma with stationary charged dusts is investigated. For typical plasma parameters relevant for experiments [J. Plasma Phys. \textbf{60}, 69 (1998)], when the beam speed is larger than the DIA speed ($v_{b0}\gtrsim1.7c_s$), three stable waves, namely the "fast" and "slow" ion-beam modes and the plasma DIA wave are shown to exist. These modes can propagate as SWs in the beam plasmas. However, in the other regime ($c_s0)$ is found to be limited by a critical value which typically depends on $M$, $v_{b0}$ as well as the ion/beam temperature. The conditions for the existence of DIA solitons are obtained and their properties are analyzed numerically in terms of the system parameters. While the system supports both the compressive and rarefactive large amplitude SWs, the small amplitude solitons exist only of the compressive type. The theoretical results may be useful for observation of soliton excitations in laboratory ion-beam driven plasmas as well as in space plasmas where the charged dusts play as impurities.

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