Signal Propagation in Collisional Plasma with Negative Ions | |
Kaganovich, I. ; Berezhnoi, S.V. ; Shin, C.B. | |
Princeton University. Plasma Physics Laboratory. | |
关键词: Diffusion; 70 Plasma Physics And Fusion Technology; Electrons; Ion Density; Transport; | |
DOI : 10.2172/772260 RP-ID : PPPL-3528 RP-ID : AC02-76CH03073 RP-ID : 772260 |
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美国|英语 | |
来源: UNT Digital Library | |
【 摘 要 】
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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