Excitation of toroidicity-induced Alfvén eigenmodes by the electrodes inserted in a heliotron/torsatron plasma.
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.
Matsunaga
G
G
Department of Energy and Engineering Science, Nagoya University, Nagoya 464-8601, Japan. matunaga@fusion.naka.jaeri.go.jp
Toi
K
K
Kawada
S
S
Kotani
J
J
Suzuki
C
C
Matsuoka
K
K