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

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

The response of low-frequency magnetic fluctuations in a transition of radial electric field (Er) 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 Er, and then disappeared afte...

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Veröffentlicht in:Plasma and Fusion Research 2015/05/26, Vol.10, pp.3402053-3402053
Hauptverfasser: MOON, Chanho, IDA, Katsumi, TOKUZAWA, Tokihiko, TANAKA, Kenji, YOSHINUMA, Mikirou, KOBAYASHI, Tatsuya, INAGAKI, Shigeru, ITOH, Kimitaka, Group, LHD Experiment
Format: Artikel
Sprache:eng
Schlagworte:
density fluctuation
Electric fields
LHD
magnetic fluctuation
Magnetic variations
Magnetohydrodynamics
MHD mode
Plasmas
radial electric field
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Beschreibung
Zusammenfassung:The response of low-frequency magnetic fluctuations in a transition of radial electric field (Er) 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 Er, and then disappeared after the transition of Er. Furthermore, it is found that the amplitude of Hα signals is enhanced, corresponding to the abrupt diminishing of the magnetic fluctuation with f ≅ 2 - 5kHz.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.10.3402053