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

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    8 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)S624-S627
    JournalJournal of Nuclear Materials
    Volume415
    Issue number1 SUPPL
    DOIs
    Publication statusPublished - Aug 1 2011

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Materials Science(all)
    • Nuclear Energy and Engineering

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