Discrete stochastic charging of aggregate grains

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dc.contributor.authorMatthews, Lorin Swint.
dc.contributor.authorShotorban, Babak
dc.contributor.authorHyde, Truell Wayne.
dc.date.accessioned2018-11-25T19:13:28Z
dc.date.available2018-11-25T19:13:28Z
dc.date.issued2018-05
dc.description.abstractDust particles immersed in a plasma environment become charged through the collection of electrons and ions at random times, causing the dust charge to fluctuate about an equilibrium value. Small grains (with radii less than 1 µm) or grains in a tenuous plasma environment are sensitive to single additions of electrons or ions. Here we present a numerical model that allows examination of discrete stochastic charge fluctuations on the surface of aggregate grains and determines the effect of these fluctuations on the dynamics of grain aggregation. We show that the mean and standard deviation of charge on aggregate grains follows the same trends as those predicted for spheres having an equivalent radius, though aggregates exhibit larger variations from the predicted values. In some plasma environments, these charge fluctuations occur on timescales which are relevant for dynamics of aggregate growth. Coupled dynamics and charging models show that charge fluctuations tend to produce aggregates which are much more linear or filamentary than aggregates formed in an environment where the charge is stationary.en_US
dc.description.keywordscomplex plasmaen_US
dc.description.keywordsplanet formationen_US
dc.description.keywordsdust chargingen_US
dc.description.keywordsstochastic chargingen_US
dc.identifier.citationPhysical Review E, 97, 053207, May, 2018.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevE.97.053207
dc.identifier.urihttps://hdl.handle.net/2104/10469
dc.language.isoenen
dc.publisherPhysical Review Een_US
dc.titleDiscrete stochastic charging of aggregate grainsen_US
dc.typeArticleen

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