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JOURNAL ARTICLE

Observation of MHD Instabilities Driven by Energetic Electrons in the Large Helical Device

M. IsobeK. OgawaA. ShimizuM. OsakabeS. KuboK. ToiLHD Experiment Group

Year: 2015 Journal:   Plasma Science and Technology Vol: 17 (4)Pages: 276-279   Publisher: IOP Publishing
DOI: 10.1088/1009-0630/17/4/03
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Abstract

Coherent magnetic fluctuations in an acoustic range of frequency have been regularly observed in low-density (ne < 0.2×1019 m−3) plasmas with strong second harmonic electron cyclotron resonance heating (ECRH) on the Large Helical Device. Hard X-ray measurements indicated that energetic electrons are generated in these ECRH discharges. The magnetic fluctuations are suppressed in higher density discharges where energetic electrons are not present. The ECRH power modulation experiment indicated that the observed magnetohydrodynamic (MHD) mode has an acoustic nature rather than an Alfvenic nature.

Keywords:
Magnetohydrodynamics Electron Physics Atomic physics Plasma Computational physics Mechanics Materials science Nuclear physics

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Citation History

Topics

Magnetic confinement fusion research
Physical Sciences →  Physics and Astronomy →  Nuclear and High Energy Physics
Ionosphere and magnetosphere dynamics
Physical Sciences →  Physics and Astronomy →  Astronomy and Astrophysics
Solar and Space Plasma Dynamics
Physical Sciences →  Physics and Astronomy →  Astronomy and Astrophysics

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