2024-03-29T07:40:13Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00012286
2023-01-16T03:59:08Z
320:321:322
Excitation of stable Alfvén eigenmodes by application of alternating magnetic field perturbations in the Compact Helical System
Ito, T.
Toi, K.
Matsunaga, G.
Isobe, M.
Nagaoka, K.
Takeuchi, M.
Akiyama, T.
Matsuoka, K.
Minami, T.
Nishimura, S.
Okamura, S.
Shimizu, A.
Suzuki, C.
Yoshimura, Y.
Takahashi, C.
open access
Copyright (2010) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Stable toroidicity-induced Alfvén eigenmodes (TAEs) with low toroidal mode number (n = 1 and n = 2) were excited by application of alternating magnetic field perturbations generated with a set of electrodes inserted into the edge region of neutral beam injection heated plasmas on the Compact Helical System [ K. Nishimura, K. Matsuoka, M. Fujiwara et al., Fusion Technol. 17, 86 (1990) ]. The gap locations of TAEs excited by the electrodes are in the plasma peripheral region of ρ>0.7 (ρ is the normalized minor radius) where energetic ion drive is negligibly small, while some AEs are excited by energetic ions in the plasma core region of ρ<0.4. The damping rate of these stable TAEs derived from plasma responses to applied perturbations is fairly large, that is, ∼ 9% to ∼ 12% of the angular eigenfrequency. This large damping rate is thought to be dominantly caused by continuum damping and radiative damping.
American Institute of Physics
2009-09
eng
journal article
VoR
http://hdl.handle.net/2237/14166
https://nagoya.repo.nii.ac.jp/records/12286
https://doi.org/10.1063/1.3223845
1070-664X
PHYSICS OF PLASMAS
16
9
092105
092105
https://nagoya.repo.nii.ac.jp/record/12286/files/PHYSICS_OF_PLASMAS_16_9_092105.pdf
application/pdf
920.8 kB
2018-02-20