Contribution of the large helical device plasmas to alfvén eigenmode physics in toroidal plasmas

K. Toi, M. Isobe, M. Osakabe, F. Watanabe, K. Ogawa, T. Tokuzawa, A. Shimizu, T. Ido, K. Ida, T. Ito, S. Morita, K. Nagaoka, K. Narihara, M. Nishiura, S. Ohdachi, S. Sakakibara, K. Tanaka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In the large helical device (LHD) having three dimensional configuration, Alfvén eigenmodes (AEs) destabilized by energetic ions are widely investigated using neutral beam heated plasmas with monotonic and non-monotonic rotational transform (ι/2π) profiles. In a plasma with monotonic ι/2π-profile, core-localized toroidicity-induced Alfvén eigenmode (TAE) as well as global one are often observed. With the increase in the averaged toroidal beta value, defined as the ratio of total plasma pressure to toroidal magnetic pressure, core-localized TAE with low toroidal mode number becomes global. In a relatively high beta plasma with monotonic ι/2π-profile, two TAEs with different toroidal mode number often interact nonlinearly and generate another modes through three wave coupling. In a plasma with non-monotonic ι/2π-profile generated by intense counter neutral beam current drive, reversed shear Alfvén eigenmode (RSAE) and geodesic acoustic mode (GAM) excited by energetic ions were observed for the first time in a helical plasma. Nonlinear coupling was also observed between RSAE and GAM.

Original languageEnglish
Pages (from-to)377-380
Number of pages4
JournalPlasma Science and Technology
Volume11
Issue number4
DOIs
Publication statusPublished - Dec 11 2009
Externally publishedYes

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toroidal plasmas
physics
neutral beams
profiles
shear
plasma pressure
acoustics
beam currents
ions
counters
configurations

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Toi, K., Isobe, M., Osakabe, M., Watanabe, F., Ogawa, K., Tokuzawa, T., ... Tanaka, K. (2009). Contribution of the large helical device plasmas to alfvén eigenmode physics in toroidal plasmas. Plasma Science and Technology, 11(4), 377-380. https://doi.org/10.1088/1009-0630/11/4/01

Contribution of the large helical device plasmas to alfvén eigenmode physics in toroidal plasmas. / Toi, K.; Isobe, M.; Osakabe, M.; Watanabe, F.; Ogawa, K.; Tokuzawa, T.; Shimizu, A.; Ido, T.; Ida, K.; Ito, T.; Morita, S.; Nagaoka, K.; Narihara, K.; Nishiura, M.; Ohdachi, S.; Sakakibara, S.; Tanaka, K.

In: Plasma Science and Technology, Vol. 11, No. 4, 11.12.2009, p. 377-380.

Research output: Contribution to journalArticle

Toi, K, Isobe, M, Osakabe, M, Watanabe, F, Ogawa, K, Tokuzawa, T, Shimizu, A, Ido, T, Ida, K, Ito, T, Morita, S, Nagaoka, K, Narihara, K, Nishiura, M, Ohdachi, S, Sakakibara, S & Tanaka, K 2009, 'Contribution of the large helical device plasmas to alfvén eigenmode physics in toroidal plasmas', Plasma Science and Technology, vol. 11, no. 4, pp. 377-380. https://doi.org/10.1088/1009-0630/11/4/01
Toi, K. ; Isobe, M. ; Osakabe, M. ; Watanabe, F. ; Ogawa, K. ; Tokuzawa, T. ; Shimizu, A. ; Ido, T. ; Ida, K. ; Ito, T. ; Morita, S. ; Nagaoka, K. ; Narihara, K. ; Nishiura, M. ; Ohdachi, S. ; Sakakibara, S. ; Tanaka, K. / Contribution of the large helical device plasmas to alfvén eigenmode physics in toroidal plasmas. In: Plasma Science and Technology. 2009 ; Vol. 11, No. 4. pp. 377-380.
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