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

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

Coherent magnetic fluctuations in an acoustic range of frequency have been regularly observed in low-density（n_e〈0.2×10~（19）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...

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Veröffentlicht in:Plasma science & technology 2015-04, Vol.17 (4), p.276-279
Hauptverfasser: Isobe, Mitsutaka, Ogawa, Kunihiro, Shimizu, Akihiro, Osakabe, Masaki, Kubo, Shin, Toi, K.
Format: Artikel
Sprache:eng
Schlagworte:
Devices
ECRH
Fluctuation
Fluid dynamics
Helical
Magnetohydrodynamics
MHD
Modulation
X-rays
二次谐波
声学性质
大型螺旋装置
电子回旋共振加热
磁流体不稳定性
驱动
高能电子
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Beschreibung
Zusammenfassung:Coherent magnetic fluctuations in an acoustic range of frequency have been regularly observed in low-density（n_e〈0.2×10~（19）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.
ISSN:1009-0630
DOI:10.1088/1009-0630/17/4/03