title: Drift-wave instability excited by field-aligned ion flow velocity shear in the absence of electron current.
abstract: The drift wave is observed to be destabilized by a magnetic-field-aligned ion flow velocity shear in the absence of field-aligned electron drift flow in laboratory experiments using a concentrically three-segmented plasma source. The fluctuation amplitude increases with increasing a shear strength, but the instability is found to be gradually stabilized when the shear strength exceeds a critical value. The destabilizing and stabilizing mechanisms are well explained by a plasma kinetic theory including the effect of radial density gradient.
authors.affiliation: Department of Electronic Engineering, Tohoku University, Sendai 980-8579, Japan. kaneko@ecei.tohoku.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Kaneko
authors.forename: H
authors.initials: H
authors.lastname: Tsunoyama
authors.forename: R
authors.initials: R
authors.lastname: Hatakeyama