Abstract
Abstract Owing to the fact that the helical wave structures with azimuthal phase dependence can exist and propagate longitudinally in a plasma, a kind of linearized ion-acoustic vortices or phonon modes are studied with orbital angular momentum in an unmagnetized uniform multi-component plasma. Laguerre-Gaussian (LG) type density and potential perturbations are considered to solve the wave equation in paraxial approximation. The solutions determine finite orbital angular momentum states associated with the ion motion giving rise to phonon modes exhibited as vortex-like (twisted) ion-acoustic waves. The electric field energy and angular momentum density are calculated and the effects of the twist due to azimuthal phase components of density and potential profiles are elaborated. The role of density balance and other parameters like radial and angular mode numbers and phase angle are highlighted in the numerical analysis. The relevance of the work with plasma motion in the environment of twisting fields is discussed.
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