When the sheath accelerates in its plasma–bound motion as a result of the ion response to the electric field, one has a top-heavy equilibrium. In the sheath frame ions are accelerated towards the wall–sheath boundary. In such a situation sheath may become unstable. The sheath instability is examined as the Rayleigh–Taylor (RT) instability and RT growth rate is compared with the reported sheath instability in the literature.
Topics
Flow instabilities
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