skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fluorescent microspheres as tracer particles in dusty plasmas

Abstract

A technique has been developed to derive the dynamic properties of an ensemble of particles in dusty plasmas by using fluorescent tracer particles. The tracers form an integral part of the entire dust system. The dynamic properties of the dust system is reconstructed from the motion of the tracer. This technique allows long-duration experiments and is applied to a two-dimensional Coulomb cluster where the flow field, intershell rotation, and stagnation points of the flow have been identified.

Authors:
;  [1]
  1. Institut fuer Physik, Ernst-Moritz-Arndt-Universitaet, Greifswald, 17487 Greifswald (Germany)
Publication Date:
OSTI Identifier:
21072280
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevE.75.016404; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DUSTS; FLUORESCENCE; MICROSPHERES; PARTICLES; PLASMA; PLASMA DIAGNOSTICS; ROTATION

Citation Formats

Miksch, Tobias, and Melzer, Andre. Fluorescent microspheres as tracer particles in dusty plasmas. United States: N. p., 2007. Web. doi:10.1103/PHYSREVE.75.016404.
Miksch, Tobias, & Melzer, Andre. Fluorescent microspheres as tracer particles in dusty plasmas. United States. doi:10.1103/PHYSREVE.75.016404.
Miksch, Tobias, and Melzer, Andre. Mon . "Fluorescent microspheres as tracer particles in dusty plasmas". United States. doi:10.1103/PHYSREVE.75.016404.
@article{osti_21072280,
title = {Fluorescent microspheres as tracer particles in dusty plasmas},
author = {Miksch, Tobias and Melzer, Andre},
abstractNote = {A technique has been developed to derive the dynamic properties of an ensemble of particles in dusty plasmas by using fluorescent tracer particles. The tracers form an integral part of the entire dust system. The dynamic properties of the dust system is reconstructed from the motion of the tracer. This technique allows long-duration experiments and is applied to a two-dimensional Coulomb cluster where the flow field, intershell rotation, and stagnation points of the flow have been identified.},
doi = {10.1103/PHYSREVE.75.016404},
journal = {Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}
  • A decrease in the number of air-borne fluorescent particles of zinc cadmium sulfide with increasing distances of travel was demonstrated in an experiment in whioh xenonl33 was used as an inert gaseous tracer. Results are tabulated. The mean loss of particles in traveling between the two sampling stations was approximately 50%. Ratios from the two assessments were almost identical. (C.H.)
  • The propagation of electromagnetic and Langmuir waves in multicomponent unmagnetized plasmas with dust particles is investigated. The effect of capture of plasma electrons and ions by the dust particles is taken into account. The recent theory proposed by Tsytovich and Havnes [Comments Plasma Phys. Controlled Fusion [bold 15], 267 (1993)] to describe the kinetics of the capture process, as well as its perturbations, is further developed. The new wave damping due to this effect is calculated.
  • The scattering of electromagnetic radiation in multicomponent unmagnetized plasmas with dust particulates is considered. It is demonstrated that the effect of capture of electrons and ions by the dust particles can affect the scattering of the electromagnetic waves. In particular, dependence of the scattering cross section on new parameters characterizing the charging process is found. The expressions for static longitudinal dielectric permittivity taking into account perturbations of the capture process are first obtained.
  • Experiments on the heating and melting of two-dimensional finite dust crystals are performed using random laser excitation of the dust particles by a rapidly moving laser beam. The achievable dust temperatures scale with the square of the laser power. The heating process is described for different dust clusters under various plasma and cluster conditions. A single-particle model is developed to explain the observed behavior of the cluster under the random laser excitation. Good quantitative agreement is found when the radiation pressure is made responsible for the particle excitation by the laser. The dynamical properties of the system during heating aremore » analyzed and the dominant modes are identified. From this, it is demonstrated that the heating process is of a nearly equilibrium nature in contrast to previous melting experiments. Finally, the melting of the dust cluster by laser heating is studied. From these experiments, a precise determination of the critical coupling parameter for the solid-fluid transition was possible. It is measured as {gamma}=270-480 for an N=18 cluster.« less
  • Structure formation of dust particles in dusty plasmas under microgravity has been simulated by the molecular dynamics method. It is shown that, at low temperatures, dust particles are organized into layered spherical shells. The number of shells is a function of the system size and the strength of screening by ambient plasma particles, while the dependency on the latter is much weaker. In the simulation, the condition of the charge neutrality satisfied by the system of dust particles and plasma particles is properly taken into account.