Tilted dust-acoustic waves in low-pressure DC complex plasma

Abstract

This study utilized the ground-based Plasmakristall-4 experiment to investigate the characteristics of dust-acoustic waves in low-pressure neon plasma generated through a direct current discharge. The experimental observations revealed the presence of dust-acoustic waves exhibiting a distinctive screw-like wavefront structure. Interestingly, the phase speed of these waves was slightly higher than the theoretical predictions. This deviation can be attributed to the influence of external forces and boundary conditions, which introduce asymmetry to the system and result in the deformation of wave patterns. To gain further insight, a comprehensive three-dimensional particle drift path reconstruction was conducted, providing a clearer understanding of the observed phenomena and confirming the findings obtained through the experimental analysis.