Study of Nonlinear Behavior of Low-Frequency MHD Mode Caused by Transition of Radial Electric Field in LHD

Chanho MOON; Katsumi IDA; Tokihiko TOKUZAWA; Kenji TANAKA; Mikirou YOSHINUMA; Tatsuya KOBAYASHI; Shigeru INAGAKI; Kimitaka ITOH; LHD Experiment Group

doi:10.1585/pfr.10.3402053

Regular Articles

Study of Nonlinear Behavior of Low-Frequency MHD Mode Caused by Transition of Radial Electric Field in LHD

Chanho MOON, Katsumi IDA, Tokihiko TOKUZAWA, Kenji TANAKA, Mikirou YOSHINUMA, Tatsuya KOBAYASHI, Shigeru INAGAKI, Kimitaka ITOH, LHD Experiment Group

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Keywords: MHD mode, magnetic fluctuation, density fluctuation, radial electric field, LHD

JOURNAL FREE ACCESS

2015 Volume 10 Pages 3402053

DOI https://doi.org/10.1585/pfr.10.3402053

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Abstract

The response of low-frequency magnetic fluctuations in a transition of radial electric field (E_r) is investigated in the edge region of LHD plasmas. Consequently, the amplitude of a magnetic fluctuation with f ≅ 2 - 5 kHz is suddenly enhanced at the transition timing of E_r, and then disappeared after the transition of E_r. Furthermore, it is found that the amplitude of H_αsignals is enhanced, corresponding to the abrupt diminishing of the magnetic fluctuation with f ≅ 2 - 5kHz.

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