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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. Sato ¹, 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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