Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51d0294d&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH51D-0294
Physics
7827 Kinetic And Mhd Theory, 7843 Numerical Simulation Studies, 6015 Dust, 6040 Origin And Evolution
Scientific paper
In the present work we focus on the role of electron emission (either thermionic, secondary or photoelectric) in charging an object immersed in a plasma. Recent work [1] has shown how electron emission can fundamentally affect the shielding potential around the dust. In particular, depending on the physical parameters of the system, the shielding potential can develop an attractive potential well. The aim of the present work is two-fold. First, we will present a theory of the existence and properties of the attractive potential well to explain the conditions for the formation, as well as providing a description of the well in terms of Lennard-Jones (LJ) potentials. Second, we focus on the consequences of attraction among eqully charged dust particle and on the peculiar collective behaviour under the circumstances. Here, we present a series of simulations conducted with a new code designed to study a large system of weakly coupled dust particles, interacting with a LJ like potential. [1] G.L. Delzanno, G. Lapenta, M. Rosenberg, Phys. Rev. Lett., 92, 035002 (2004).
Delzanno Gian Luca
Lapenta Giovanni
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