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Author(s):
A. Fujisawa, K. Itoh, A. Shimizu, H. Nakano, S. Ohsima, H. Iguchi, K. Matsuoka, S. Okamura, S.-I. Itoh and P. H. Diamond
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Title:
Spectrograph of Electric Field Fluctuation in Toroidal Helical Plasma
Date of publication:
Sep. 2005
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Key words:
electric field fluctuation, heavy ion beam probes, geodesic acoustic modes, long-range correlation, radial eigen function
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Abstract:
This is a report on fluctuation measurements using twin heavy ion beam probes in CHS. The observation shows that a dozen of coherent modes with intermittent nature coexist in an electron cyclotron heated plasma. The modes are found to have long-distance correlation in toroidal direction. The radial structure of the modes are evaluated in potential fluctuation. The characteristics are not in contradictory with geodesic acoustic modes.
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