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In recent LHD experiments, high Ti plasmas are generated by neutral beam injection, and spatial profiles of density fluctuations are measured by phase contrast imaging (PCI) [K. Tanaka et al., Plasma Fusion Res. 5, S2053 (2010)]. The observed fluctuations most likely propagate in the direction of the ion diamagnetic rotation in the plasma frame, and their amplitudes increase with the growth of the temperature gradient. The results show the characteristics of ITG turbulence. To investigate the ITG modes and zonal flows in the experiment, linear gyrokinetic simulations were performed in the corresponding equilibria with different Ti profiles by using the GKV-X code [M. Nunami et al., Plasma Fusion Res. 5, 016 (2010)]. The simulation results predict unstable regions for the ITG modes in radial, wavenumber, and phase velocity spaces, in agreement with the PCI measurements. Thus, the fluctuations observed in the experiment are attributed to ITG instability. 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Linear Gyrokinetic Analyses of ITG Modes and Zonal Flows in LHD with High Ion Temperature
http://hdl.handle.net/10655/6444
http://hdl.handle.net/10655/6444f675321b-01c4-4ddd-9032-200ab630d285
名前 / ファイル | ライセンス | アクション |
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pfr2011_06-1403001.pdf (1.1 MB)
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Item type | 学術雑誌論文 / Journal Article_02(1) | |||||
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公開日 | 2012-01-30 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Linear Gyrokinetic Analyses of ITG Modes and Zonal Flows in LHD with High Ion Temperature | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | gyrokinetic simulation | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | LHD | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ITG mode | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | zonal flow | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | high ion temperature | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
NUNAMI, Masanori
× NUNAMI, Masanori× WATANABE, Tomo-Hiko× SUGAMA, Hideo× TANAKA, Kenji |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Ion temperature (Ti) gradient modes (ITG modes) and zonal flows for high Ti discharges in the Large Helical Device (LHD) are investigated by linear gyrokinetic Vlasov simulation. In recent LHD experiments, high Ti plasmas are generated by neutral beam injection, and spatial profiles of density fluctuations are measured by phase contrast imaging (PCI) [K. Tanaka et al., Plasma Fusion Res. 5, S2053 (2010)]. The observed fluctuations most likely propagate in the direction of the ion diamagnetic rotation in the plasma frame, and their amplitudes increase with the growth of the temperature gradient. The results show the characteristics of ITG turbulence. To investigate the ITG modes and zonal flows in the experiment, linear gyrokinetic simulations were performed in the corresponding equilibria with different Ti profiles by using the GKV-X code [M. Nunami et al., Plasma Fusion Res. 5, 016 (2010)]. The simulation results predict unstable regions for the ITG modes in radial, wavenumber, and phase velocity spaces, in agreement with the PCI measurements. Thus, the fluctuations observed in the experiment are attributed to ITG instability. The responses of the zonal flows show clear contrasts in different field spectra that depend on the Ti profile and the radial position. In addition to the dependence on the field spectra, the zonal flow residual levels are enhanced by increasing the radial wavenumber as theoretically predicted. | |||||
書誌情報 |
en : Plasma and Fusion Research 巻 Vol.6, p. 1403001-1-8, 発行日 2011-02-01 |
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出版者 | ||||||
出版者 | プラズマ・核融合学会 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1585/pfr.6.1403001 | |||||
権利 | ||||||
権利情報 | ? 2011 The Japan Society of Plasma Science and Nuclear Fusion Research |