Simple hexagonal coulomb crystal near a deformed plasma sheath boundary ina dusty plasma

Simple hexagonal Coulomb crystals have been observed near a deformed plasma sheath boundary in a dusty plasma. It seems that particle rows, which are found in the direction perpendicular to an electrode in the Coulomb crystal , are formed due to not only Coulomb repulsive forces but also some attract ive forces. In this study, experiments using the deformed sheath revealed t hat the rows were bent along the direction of electric fields and ion flows in a plasma. The result shows that sheath structures and shapes affect Cou lomb crystal structures in dusty plasmas. In this paper, the formation of t he particle rows are discussed, where balances of forces on particles in a dusty plasma are taken into account under the assumption that wake potentia ls related to ion Bows exist in the sheath region.