Plasma, Hydro- and Gas Dynamics

JETP Letters

, Volume 94, Issue 5, pp 356-361

First online:

Nonplanar double layers in plasmas with opposite polarity dust

  • A. A. MamunAffiliated withThe Abdus Salam International Centre for Theoretical Physics Email author 
  • , A. MannanAffiliated withDepartment of Physics, Jahangirnagar University

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Nonplanar (cylindrical and spherical) double layers (DLs) in a four-component dusty plasma (composed of inertial positively and negatively charged dust, Boltzmann electrons and ions) are studied by employing the reductive perturbation method. The modified Gardner equation describing the nonlinear propagation of the dust-acoustic (DA) waves is derived, and its nonplanar double layer solutions are numerically analyzed. The parametric regimes for the existence of the DLs, which are found to be associated with positive potential only, are obtained. The basic features of nonplanar DA DLs, which are found to be different from planar ones, are also identified. The implications of our results to different space and laboratory dusty plasma situations, where opposite polarity dust are observed, are discussed.