Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD

C. Moon, T. Kobayashi, K. Ida, T. Tokuzawa, C. Hidalgo, M. Yoshinuma, K. Ogawa, K. Itoh, A. Fujisawa

研究成果: ジャーナルへの寄稿記事

抄録

It is observed that a low-frequency (∼2 kHz) density fluctuation is excited in a transition of the poloidal flow velocity (Vθ) in the edge magnetic stochastic region of the Large Helical Device plasmas. Furthermore, it is found that the propagation velocity becomes approximately zero in the proximity of the appearance region of the low-frequency fluctuation by using the edge multichannel microwave Doppler reflectometer system. In particular, the low-frequency fluctuation is considered to be transmitted in both directions (inward and outward) away from the excitation position of the fluctuation, which behaves as the precursor of a magnetic fluctuation burst. Afterward, the edge H α signal intensity is sharply increased.

元の言語英語
記事番号092302
ジャーナルPhysics of Plasmas
26
発行部数9
DOI
出版物ステータス出版済み - 9 1 2019

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flow velocity
low frequencies
reflectometers
propagation velocity
proximity
bursts
microwaves
excitation

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

これを引用

Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD. / Moon, C.; Kobayashi, T.; Ida, K.; Tokuzawa, T.; Hidalgo, C.; Yoshinuma, M.; Ogawa, K.; Itoh, K.; Fujisawa, A.

:: Physics of Plasmas, 巻 26, 番号 9, 092302, 01.09.2019.

研究成果: ジャーナルへの寄稿記事

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T1 - Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD

AU - Moon, C.

AU - Kobayashi, T.

AU - Ida, K.

AU - Tokuzawa, T.

AU - Hidalgo, C.

AU - Yoshinuma, M.

AU - Ogawa, K.

AU - Itoh, K.

AU - Fujisawa, A.

PY - 2019/9/1

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AB - It is observed that a low-frequency (∼2 kHz) density fluctuation is excited in a transition of the poloidal flow velocity (Vθ) in the edge magnetic stochastic region of the Large Helical Device plasmas. Furthermore, it is found that the propagation velocity becomes approximately zero in the proximity of the appearance region of the low-frequency fluctuation by using the edge multichannel microwave Doppler reflectometer system. In particular, the low-frequency fluctuation is considered to be transmitted in both directions (inward and outward) away from the excitation position of the fluctuation, which behaves as the precursor of a magnetic fluctuation burst. Afterward, the edge H α signal intensity is sharply increased.

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