Role of stochastic fluctuations in the charge on macroscopic particles in dusty plasmas |
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Authors: | O S Vaulina A P Nefedov O F Petrov S A Khrapak |
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Institution: | (1) Scientific-Research Center for Thermal Physics and Pulsed Interactions, Russian Academy of Sciences, 127412 Moscow, Russia |
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Abstract: | The currents which charge a macroscopic particle placed in a plasma consist of discrete charges; hence, the charge can undergo
random fluctuations about its equilibrium value. These random fluctuations can be described by a simple model which, if the
mechanisms for charging of macroscopic particles are known, makes it possible to determine the dependence of the temporal
and amplitude characteristics of the fluctuations on the plasma parameters. This model can be used to study the effect of
charge fluctuations on the dynamics of the macroscopic particles. The case of so-called plasma-dust crystals (i.e., highly
ordered structures which develop because of strong interactions among macroscopic particles) in laboratory gaseous discharge
plasmas is considered as an example. The molecular dynamics method shows that, under certain conditions, random fluctuations
in the charge can effectively heat a system of macroscopic particles, thereby impeding the ordering process.
Zh. éksp. Teor. Fiz. 115, 2067–2079 (June 1999) |
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