Abstract

In this work, a particle in cell simulation of the low frequency Buneman instability in the presence of negative ions in a current carrying plasma is presented. Simulation results show that in the presence of negative ions, the phase space holes form earlier. Electron distribution function also confirms counter-streaming and plateau structure in this system. Energy density diagrams indicate that the saturation time depends on the velocity and mass of negative and positive ions. From growth rate diagrams, it is concluded that in the presence of heavy negative ions, the growth rate of instability decreases. In addition to the low frequency Buneman instability, it is shown that a pure ion-ion two stream instability can also be excited in the absence of electrons.

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