TY - JOUR
T1 - Measurement of fluctuations in the supersonic poloidal flow driven by a hot cathode
AU - Tanaka, Y.
AU - Takahashi, H.
AU - Utoh, H.
AU - Shinde, J.
AU - Ogawa, M.
AU - Iwazaki, K.
AU - Aoyama, H.
AU - Okamoto, A.
AU - Shinto, K.
AU - Kitajima, S.
AU - Yokoyama, M.
AU - Inagaki, S.
AU - Suzuki, Y.
AU - Nishimura, K.
AU - Sasao, M.
PY - 2006/5
Y1 - 2006/5
N2 - The density and potential fluctuations were measured in hot-cathode biasing plasma at the Tohoku University Heliac. In the improved mode, high-frequency fluctuations (>100 kHz) appeared in the density signal. On the other hand, low-frequency fluctuations (<100 kHz) in the density and potential signals were suppressed. The characteristics of high-frequency fluctuation were compared with three kinds of instability, and they were consistent with those of the flute instability driven by the supersonic poloidal rotation. The suppression of low-frequency fluctuations in improved mode is considered the effect of E × B poloidal rotation or its shear. The profile of the anomalous particle flux was estimated by analysing the low-frequency fluctuation signals. The flux decreased in the improved mode in most of the region, although the decrease in flux was small near the rational surface (n/m = 5/3).
AB - The density and potential fluctuations were measured in hot-cathode biasing plasma at the Tohoku University Heliac. In the improved mode, high-frequency fluctuations (>100 kHz) appeared in the density signal. On the other hand, low-frequency fluctuations (<100 kHz) in the density and potential signals were suppressed. The characteristics of high-frequency fluctuation were compared with three kinds of instability, and they were consistent with those of the flute instability driven by the supersonic poloidal rotation. The suppression of low-frequency fluctuations in improved mode is considered the effect of E × B poloidal rotation or its shear. The profile of the anomalous particle flux was estimated by analysing the low-frequency fluctuation signals. The flux decreased in the improved mode in most of the region, although the decrease in flux was small near the rational surface (n/m = 5/3).
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U2 - 10.1088/0741-3335/48/5A/S27
DO - 10.1088/0741-3335/48/5A/S27
M3 - Article
AN - SCOPUS:34247539214
SN - 0741-3335
VL - 48
SP - A285-A293
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 5 A
ER -