A coordinated study of a laboratory experiment, a computer simulation, and a theoretical analysis reveals a structure and its dynamic motion of a Coulomb cluster trapped in a plasma with a confining potential in the presence of gravitational and magnetic fields. Charged dust particulates are found to form a circle in a horizontal plane with a radius determined by a balance of a restoring force due to a confining potential and the screened Coulomb force between dust particulates. The dust particulates in a circle show angular rotation with the structure intact, while they oscillate radially around the equilibrium orbit. The analytical study reveals the oscillatory rotational nature of dust particulates as a result of coupling between the Lorentz force and the harmonic oscillation.
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Ishihara et al. (2002) studied this question.
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