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Author(s):
A. Fujisawa, A. Shimizu, H. Nakano, S. Ohsima, K. Itoh, H. Iguchi, K. Matsuoka, S. Okamura, S.-I. Itoh and P.H. Diamond
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Title:
Properties of Turbulence and Stationary Zonal Flow on Transport Barrier in CHS
Date of publication:
Oct. 2005
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Key words:
electric field fluctuation, heavy ion beam probes, turbulence, zonal
flow, internal transport barrier
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Abstract:
Spectral changes in electric field fluctuation are measured using twin heavy ion beam probes in CHS before and after an internal transport barrier is broken down. A wavelet analysis reveals intermittent behaviors of the fluctuations, and a significant correlation between fluctuation powers of the low (2.5 < f < 10 kHz) and high (30 < f < 250 kHz) ranges. The high frequency (turbulence) fluctuation increases with a decrease in the low frequency fluctuation after the back-transition. The change in the power distribution between these two frequency ranges may contribute to the improved transport on the barrier.
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