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Start Over Author "Arp, O." Topic coulomb functions
2 results on '"Arp, O."'

1. Experiments on Structure and Trapping of Coulomb balls.

Author

Block, D., Arp, O., Piel, A., and Melzer, A.

Subjects
*COULOMB functions, *NUCLEAR forces (Physics), *WAVE mechanics, *STRONGLY coupled plasmas, *PLASMA gases, *NUCLEAR physics
Abstract

This paper gives a survey of recent experiments on Coulomb balls. Starting with typical observations to introduce the Coulomb ball experiment and its diagnostic potential, their structural properties are discussed. Further, the trapping mechanism for the dust is quantified to allow for a systematic comparison of experiment and simulations. Finally, the presented results focus on the question how screening influences the structural properties and how Coulomb balls and other strongly coupled systems are related. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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2. Confinement of Coulomb balls.

Author

Arp, O., Block, D., Klindworth, M., and Piel, A.

Subjects
*COULOMB functions, *NUCLEAR forces (Physics), *PLASMA confinement, *CONTROLLED fusion, *PINCH effect (Physics), *PLASMA electrodynamics, *ELECTRIC fields, *FIELD theory (Physics), *FORCE & energy, *PHYSICS
Abstract

A model for the confinement of the recently discovered Coulomb balls is proposed. These spherical three-dimensional plasma crystals are trapped inside a rf discharge under gravity conditions and show an unusual structural order in complex plasmas. Measurements of the thermophoretic force acting on the trapped dust particles and simulations of the plasma properties of the discharge are presented. The proposed model of confinement considers thermophoretic, ion-drag, and electric field forces, and shows excellent agreement with the observations. The findings suggest that self-confinement does not significantly contribute to the structural properties of Coulomb balls. [ABSTRACT FROM AUTHOR]

Published
2005
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