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Author(s):
Y. Hamada, A. Nishizawa, Y. Kawasumi, A. Fujisawa, M. Kojima, K. Narihara, K. Ida, A. Ejiri, S. Ohdachi, K. Kawahata, K. Toi, K. Sato, T. Seki, H. Iguchi, K. Adachi, S. Hidekuma, S.Hirokura, K. Iwasaki, T. Ido, R. Kumazawa, H. Kuramoto, T. Minami, I. Nomura, M. Sasao, K.N. Sato, T. Tsuzuki, I. Yamada and T. Watari
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Title:
Potential Turbulence in Tokamak Plasmas
Date of publication:
Oct. 1998
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Key words:
IAEA, fusion energy conference, Yokohama
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Abstract:
Microscopic potential turbulence in tokamak plasmas are investigated by a multi-sample-volume heavy ion beam probe. The wavenumber/frequency spectra S(k,omega) of the plasmas potential fluctuation as well as density fluctuation are obtained for the first time. The instantaneous turbulence-driven particle flux, calculated from potential and density turbulence has oscillations of which amplitude is about 100 times larger than the steady-state outwards flux, showing sporadic behaviours. We also observed large-scale coherent potential oscillations with the frequency around 10-40 kHz.
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