NDLI: Kinetics of Dusty (Complex) Plasmas: Role of Variable Charges

Content Provider	IEEE Xplore Digital Library
Author	Ivlev, A.V. Zhdanov, S.K. Klumov, B.A. Morfill, G.E.
Copyright Year	2005
Description	Author affiliation: Max-Planck-Inst. fur Extraterrestrial Phys., Garching (Ivlev, A.V.; Zhdanov, S.K.; Klumov, B.A.; Morfill, G.E.)
Abstract	Summary form only given. Charges of microparticles in complex (dusty) plasmas are not constant, but fluctuate in time around some equilibrium value which, in turn, is some function of spatial coordinates. Generally, ensembles of particles with variable charges are non-Hamiltonian systems where the mutual collisions do not conserve energy. An appropriate way to investigate evolution of such systems is to employ the kinetic approach. We studied (both analytically and numerically) two cases: (a) inhomogeneous charge - it depends on the particle coordinate but does not change in time, and (b) fluctuating charge - it changes in time around the equilibrium value, which is constant in space. For the theoretical analysis we used the Fokker-Planck approach to derive the collision integral which describes the momentum and energy transfer in mutual particle collisions as well as in the collisions with neutrals, for the numerical analysis the molecular dynamics simulations were employed. We obtained that the mean particle energy grows in time when the neutral friction is below a certain threshold. In case (a) the energy changes as $prop(t_{cr}-t)^{-2},$ in case (b) it scales as $prop(t_{cr}-t)^{-1},$ exhibiting the explosion-like growth with $t_{cr}$ a critical time scale. The obtained solutions can be of significant importance for laboratory dusty plasmas as well as for space plasma environments, where inhomogeneous charge distributions are often present. For instance, the instability can cause dust heating in low-pressure complex plasma experiments, it can be responsible for the melting of plasma crystals, it might operate in protoplanetary disks and affect the kinetics of the planet formation, etc.
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	348
Ending Page	348
File Size	1017404
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359506
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Kinetic theory Dusty plasma Space charge Energy exchange Particle collisions Numerical analysis Analytical models Friction Heating Crystals
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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