Abstract
We have observed a Coulomb dust cloud with a funnel shape composed of multiple layers formed in sheath-plasma boundary in a de glow discharge. In order to make clear an underlying physics for formation of such a Coulomb cloud, we have performed the one- and three-dimensional particle simulations. The one-dimensional shows an effect of the self-gravity on the trapping of the dust particles in the plasma-sheath boundary. The three-dimensional particle simulation shows that dust particles compose a Coulomb crystal structure by assuming a moderate friction force. A radial electric force causes multiple layers structure of dust particles. These simulation results are in a good agreement with an experiment ones.
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