Small particles in plasmas can form a coulomb lattice. The conditions for solidification in a laboratory plasma are discussed.

No abstract

No abstract

Ion-acoustic solitary wave (solitons) have been studied experimentally by employing a double-plasma device. The solitary waves are found to be produced from both a single compressional pulse and a continuous wave. A rarefaction pulse also produces solitons if the pulse width is sufficiently wide. A theory based on the Schrödinger equation accounts for the number of solitons. Recurrence to the original state is observed when a continuous wave is launched. A simple wave-wave coupling analysis for the recurrence of the original state is given.

No abstract