Effect of magnetic configuration on particle transport and density fluctuation in LHD

Kenji Tanaka, Clive Michael, Masayuki Yokoyama, Osamu Yamagishi, Kazuo Kawahata, Tokihiko Tokuzawa, Mamoru Shohji, Hiroshi Yamada, Jyunichi Miyazawa, Shigeru Morita, Katsumi Ida, Mikiro Yoshinuma, Kazumichi Narihara, Ichihiro Yamada, Shigeru Inagaki, Leonid Vyacheslavov, Andrei Sanin, Sadayoshi Murakami, Arimitsu Wakasa

研究成果: ジャーナルへの寄稿学術誌査読

12 被引用数 (Scopus)

抄録

The characteristics of particle transport in three different magnetic configurations are studied from density modulation experiments in the Large Helical Device (LHD). These three configurations are represented as different magnetic axis positions (Rax) of the vacuumfield. Experiments were carried out in a range of different heating powers for each configuration with almost constant density. The experimental values of particle diffusion coefficients (D) and particle convection velocities (V) are compared with neoclassical estimates. The value of D is found to be anomalously large compared to neoclassical values in both the core and edge in all configurations. At low collisionality, this anomaly tends downward. The core convection velocities are comparable with neoclassical estimates. In more-outward-shifted configurations, particle transport is enhanced. The electron temperature and electron temperature gradient are the determinate parameters for D and V, respectively, in each configuration. The effective helical ripple is one of the important parameters for particle transport in the LHD; however, other hidden parameters exist. The role of fluctuations in particle transport is investigated from turbulence measurements using a two-dimensional phase contrast interferometer. Three kinds of fluctuation having different locations, propagation direction, and peak wave number are observed. One of these, which exists in the outermost edge region and propagates in the ion diamagnetic direction in the laboratory frame, plays a possible role in edge anomalous diffusion. The amplitudes of ion diamagnetic fluctuation components are compared with the linear growth rate of the ion temperature gradient mode.

本文言語英語
ページ(範囲)97-111
ページ数15
ジャーナルFusion Science and Technology
51
1
DOI
出版ステータス出版済み - 1月 2007
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 核物理学および高エネルギー物理学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)
  • 機械工学

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