Structure and trapping of three-dimensional dust clouds in a capacitively coupled rf-discharge

Details Structure and trapping of three-dimensional dust clouds in a capacitively coupled rf-discharge Structure and trapping of three-dimensional dust clouds in a capacitively coupled rf-discharge

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..799...20a&link_type=abstract

NEW VISTAS IN DUSTY PLASMAS: Fourth International Conference on the Physics of Dusty Plasmas. AIP Conference Proceedings, Volum

Physics

2

Dusty Plasmas, Plasma Simulation, Particle Size, Crystal Structure, Plasma Confinement, High-Frequency Discharges, Dusty Or Complex Plasmas, Plasma Crystals, Plasma Simulation, Electrostatic And High-Frequency Confinement

Scientific paper

In this survey the recently found ``Coulomb balls'' are discussed, which show an unusual kind of crystalline order. These three-dimensional dust clouds consisting of hundreds or thousands of micrometer-sized dust particles have a spherical shape and exist in a wide range of plasma conditions. Coulomb balls are optically highly transparent and have macroscopic dimensions of several millimeters in diameter. The clouds allow for the observation of each single particle and thus the complete reconstruction of the crystal structure by means of video microscopy techniques. The particles are arranged in distinct nested shells in which they form patterns with mostly five and six neighbors. The confinement of Coulomb balls by dielectric walls involves electric forces, surface charges, ion drag forces, and thermophoretic levitation. The thermophoretic force field is measured with tracer particles and particle image velocimetry (PIV). The electric forces are derived from simulations with the two-dimensional SIGLO-2D code. It is shown the the sum of all confineing forces results in a stable potential well that describes levitation and spherical confinement of the Coulomb ball.

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