title: Dynamics of electron-plasma vortex in background vorticity distribution.
abstract: Dynamics of a point vortex in interaction with a broad profile of background vorticity is studied experimentally by using an electron plasma. The observed motion of the vortex compares favorably with a recently proposed theoretical model [D. A. Schecter and D. H. E. Dubin, Phys. Rev. Lett. 83, 2191 (1999)]. Perturbations in the background distribution in the wake of the spiral orbit of the vortex amount to several tens of percent and are considered to be a major reason for deviations of the observation from the linear theoretical model.
authors.affiliation: Department of Fundamental Sciences, Faculty of Integrated Human Studies, Kyoto University, Yoshida Nihonmatsu-cho, Sakyo-ku, Kyoto 606-8501, Japan. m52279@sakura.kudpc.kyoto-u.ac.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Kiwamoto
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: A
authors.initials: A
authors.lastname: Sanpei
authors.forename: A
authors.initials: A
authors.lastname: Mohri