Abstract
In a recent paper, Takamura et al. [Phys. Plasmas 8, 1886 (2001)] described a variety of dynamic behaviors of dust grains in a dusty plasma device under conditions of a weak friction with gas molecules, that is, at low neutral background gas pressures. When the gas pressure is decreased below a critical value, an instability leading to large amplitude dust oscillations is observed in a single horizontal layer of dust grains trapped near the plasma–sheath boundary above a negatively biased mesh electrode. The instability mechanism has been identified as delayed charging of a dust grain in a plasma sheath. Our objective here is to indicate that the delayed charging mechanism cannot account for stochastic dust oscillations, and to point out a new mechanism that can explain the observed features of large amplitude self-excited dust oscillations.
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