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Author: Samsonov, D. × Publisher: [London] : IOP ×

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    Large-scale steady-state structure of a 2D plasma crystal
    ([London] : IOP, 2003) Zhdanov, S.; Quinn, R. A.; Samsonov, D.; Morfill, G. E.
    An analytical model, based on a simple physical analogy, and a non-linear analytic/numerical model of the large-scale structure (averaged over the size of a single cell) of a two-dimensional (2D) lattice have been developed. In the first model, a physical analogy between the lattice layer steady state and the stressed state of a rotating solid body was used to derive the model equations and the model is shown to be in good agreement with the results of a 2D simulation. The non-linear model is derived from the force balance between external and internal forces in the continuum limit and compares favourably with an experimental example.
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    Levitation and agglomeration of magnetic grains in a complex (dusty) plasma with magnetic field
    ([London] : IOP, 2003) Samsonov, D.; Zhdanov, S.; Morfill, G.; Steinberg, V.
    Interaction of magnetic particles with each other and with a magnetic field was studied experimentally in a complex plasma. Monodisperse plastic microspheres with magnetic filler were suspended in an rf symmetrically driven discharge to form a multilayer dust cloud. The magnetic field induced a magnetic moment in the grains. The particles were pulled upward in the direction of the magnetic field gradient and their levitation height increased. This was used as a new diagnostic method to calculate the particle charge and the thickness of the plasma sheath. It was demonstrated that the particle weight can be compensated for. Some particles formed agglomerates due to magnetic attraction between the grains. Analysis of the particle interaction forces showed that at intermediate magnetic fields (used in the experiment) the particles can agglomerate only if their kinetic energy is high enough to overcome the barrier in the interaction potential. The possibility of magnetically induced formation of a plasma crystal was discussed.
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    Mutual interactions of magnetized particles in complex plasmas
    ([London] : IOP, 2003) Yaroshenko, V. V.; Morfill, G. E.; Samsonov, D.; Vladimirov, S. V.
    Various mutual dust-dust interactions in complex plasmas, including the forces due to induced magnetic and electric moments of the grains are discussed. It is shown that the dipole short-range forces can be responsible for the formation of field-aligned chains. Such chains may incorporate a few tens of individual particles, as frequently observed in experiments.