Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session CO8: Dusty Plasmas, Sources, and Diagnostics
2:00 PM–5:00 PM,
Monday, November 5, 2018
OCC Room: C120-122
Chair: Lorin Matthews, Baylor University
Abstract ID: BAPS.2018.DPP.CO8.2
Abstract: CO8.00002 : Anomalous diffusion in microgravity complex plasma cloud*
2:12 PM–2:24 PM
(Texas Tech University)
(University of Delaware)
Lorin S Matthews
Truell W Hyde
Diffusion is a persistent random walk characteristic of various physical systems, including amorphous semiconductors, porous media, glasses, granular matter, ionic liquids, polymers, and plasmas. In the normal diffusion regime, the mean square displacement (MSD) of an ensemble of moving particles increases linearly in time, i.e. 〈x2〉∼tα, where α=1. However, exponents α≠1 are also possible, yielding two distinct examples of anomalous transport: subdiffusion when α<1 and superdiffusion when α>1. Here we present a study of anomalous diffusion in strongly coupled systems where both structural defects and long-distance interactions are present. Our innovative numerical technique combines results from spectral theory and fractional calculus to model transport characterized by an Anderson-type Hamiltonian with a fractional Laplacian operator. The numerical results are compared against video data from complex plasma experiments performed in the Plasmakristal-4 facility on board the International Space Station.
*This work was supported by NASA grant number 1571701, NSF grant number 1740203 (LSM and TWH), and NSF-DMS grant number 1802682 (CDL).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.CO8.2
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