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VOLUME 74 (2001) | ISSUE 2 | PAGE 81
Large Amplitude Oscillations Sustained by Stochastic Plasma Density Fluctuations in Plasma Sheaths
PACS: 52.25.-b, 52.35.-g, 52.40.Hf
Abstract
We have examined the dynamics of a dust grain immersed in a plasma sheath. It is shown that the presence of stochastic plasma density variations can sustain a large amplitude dust grain oscillations once these have been induced by a slow plasma number density variation. Such dust oscillations have been observed in the sheath region of an radio-frequency or a dc plasma discharge at very low pressures. A physical mechanism for the excitation and maintenance of large amplitude grain oscillations is discussed.