Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p41c1638p&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P41C-1638
Physics
[6213] Planetary Sciences: Solar System Objects / Dust, [6250] Planetary Sciences: Solar System Objects / Moon, [6025] Planetary Sciences: Comets And Small Bodies / Interactions With Solar Wind Plasma And Fields
Scientific paper
Dust grains are charged by high-energy electrons in diverse plasma environments - in laboratory plasmas (e.g., tokamak) as well as in space plasmas (e.g., planetary magnetospheres). Impacts of these electrons onto the grain surface increase a portion of low-energy secondary electrons. Moreover, primary electrons can be scattered out from submicron grains. We had developed the numerical model that includes both effects and that well fits measurements of equilibrium potentials in a wide range of grain diameters. In our model, only those electrons having a sufficient energy to leave a particular dust grain can contribute to its charging. Spectra of secondary electrons can be acquired based on a correlation between measured surface potentials and modeled electron yields for various beam energies. The contribution deals with the last modification of the numerical model that includes a non-spherical geometry of the dust grain as well as a surface roughness that was suggested to play a significant role in the case when it is comparable to the mean free path of secondary electrons because they are scattered more efficiently. However, we have found that the influence of the grain shape is larger than that of its roughness. We present model results for simulants of the Lunar regolith (LHT) and compare them with the laboratory experiment.
Beránek Martin
Nemecek Zdenek
Pavlu Jiri
Richterova I.
Safrankova Jana
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