Acceleration of blob driven by helical instability in a simple magnetic configuration in QUEST

H. Zushi, N. Nishino, K. Hanada, H. Honma, H. Q. Liu, Y. Higashizono, M. Sakamoto, S. Tashima, T. Ryoukai

    研究成果: Contribution to journalArticle査読

    8 被引用数 (Scopus)

    抄録

    Blob generation mechanisms have been studied in slab plasma produced by electron cyclotron waves in a simple magnetic configuration with vertical (Bz) and toroidal fields (Bt). Two dimensional high speed images are analyzed as plasma and fluctuation evolution. Near the outer boundary (source region) of the slab plasma helix-sinusoidal perturbations are exited, whose helix angle and vertical wavelength are consistent with pitch angle and turn distance of the magnetic field lines there. Two dimensional evolution of these helix instabilities are studied as a function of Bz/B t. Steep gradient outside the source region triggers the plasma to expand radially as a blob ejection. Along the ridge line of the maximum inverse scale length a wave front of the helix perturbation moves outward. Radial ejection of blob with typical velocity of ∼1 km/s is recognized as non-linear evolution of these helix instabilities. Acceleration of a blob is found in the source-free region.

    本文言語英語
    ページ(範囲)S624-S627
    ジャーナルJournal of Nuclear Materials
    415
    1 SUPPL
    DOI
    出版ステータス出版済み - 8 1 2011

    All Science Journal Classification (ASJC) codes

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

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