Navigation   about theory   people   projects   publications   review   simulations   home		Signal Propagation in Collisional Plasma with Negative Ions Authors: I. Kaganovich, S.V. Berezhnoi, and C.B. Shin Date of PPPL Report: December 2000 Submitted to: Physics of Plasmas The transport of charged species in collisional currentless plasmas is traditionally thought of as a diffusion-like process. In this paper, it is demonstrated that, in contrast to two-component plasma, containing electrons and positive ions, the transport of additional ions in multi-species plasmas is not governed by diffusion, rather described by nonlinear convection. As a particular example, plasmas with the presence of negative ions have been studied. The velocity of a small perturbation of negative ions was found analytically and validated by numerical simulation. As a result of nonlinear convection, initially smooth ion density profiles break and form strongly inhomogeneous shock-like fronts. These fronts are different from collisionless shocks and shocks in fully ionized plasma. The structure of the fronts has been found analytically and numerically.
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