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Author(s):
T. Oike, K. Kitachi, S. Ohdachi, K. Toi, S. Sakakibara, S. Morita, T. Morisaki, H. Suzuki, S. Okamura, K. Matsuoka and CHS group
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Title:
Measurement of Magnetic Field Fluctuations near Plasma Edge with Movable Magnetic Probe Array in the CHS Heliotron/Torsatron
Date of publication:
Mar. 1996
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Key words:
Heliotron/Torsatron, Magnetic Fluctuations, Movable Magnetic Probe Array, Correlation Length, Interchange Mode
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Abstract:
Magnetic fluctuations are measured with a newly developed movable probe array in the region from scrape-off layer to just inside the last closed flux surface of neutral beam heated plasmas in CHS . Radial profiles of magnetic fluctuation amplitude and their correlation length are derived for low frequency (< 40 kHz) coheĦĦrent components having low mode number and relatively high frequency (> 60 kHz) incoherent ones. The former components are inferred to be an ideal interchange mode excited in the plasma interior and has a large radial correlation length L_r geq < a > (averaged minor radius). The latter of which instability is not yet identified has relatively short correlation length L_r ~ < a >/7.
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