title: Excitation of toroidicity-induced Alfvén eigenmodes by the electrodes inserted in a heliotron/torsatron plasma.
abstract: A novel method of exciting shear Alfvén waves using electrodes inserted in a plasma was developed for basic study of Alfvén eigenmodes in a heliotron/torsatron plasma. The electrodes can induce excitation current along the confinement field line, and generate magnetic perturbations perpendicular to the confinement field. By sweeping the frequency of the current in a cold plasma, the toroidicity-induced Alfvén eigenmode was resonantly excited at the predicted frequency and radial location. Plasma response to the applied magnetic perturbations indicates a fairly large damping rate caused by continuum damping.
authors.affiliation: Department of Energy and Engineering Science, Nagoya University, Nagoya 464-8601, Japan. matunaga@fusion.naka.jaeri.go.jp
authors.forename: G
authors.initials: G
authors.lastname: Matsunaga
authors.forename: K
authors.initials: K
authors.lastname: Toi
authors.forename: S
authors.initials: S
authors.lastname: Kawada
authors.forename: J
authors.initials: J
authors.lastname: Kotani
authors.forename: C
authors.initials: C
authors.lastname: Suzuki
authors.forename: K
authors.initials: K
authors.lastname: Matsuoka