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(EXP2/14) Potential Turbulence in Tokamak Plasmas

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. Adati, S. Hidekuma, S. Hirokura, K. Iwasaki, T. Ido, R. Kumazawa, H. Kuramoto, T. Minami, I. Nomura, M. Sasao, K. N. Sato¹, T. Tsuzuki, I. Yamada, and T. Watari

National Institute for Fusion Science, Toki, Japan
¹ present address: Advanced Fusion Research Center, RIAM, Kyushu University, Kasuga, Japan

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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