A Quasi-Coherent Electrostatic Mode in ECRH Plasmas on TJ-II
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概要
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A new type of instability mode, related to suprathermal electrons, was found in extremely low-density plasmas, (ne = (0.2-0.5) × 1019 m−3) with electron cyclotron resonance heating and current drive (ECRH/ECCD) in the TJ-II heliac. The quasi-monochromatic density and plasma potential oscillations in the frequency range 20-120 kHz tend to have several “branches” with constant frequency shift between them. The typical amplitude of the mode induced potential oscillations was estimated to be ΔφEM ∼ 20 V. The mode branches have an individual and finite radial extent, odd low poloidal structure (m ≤ 5) and angular phase velocity of poloidal rotation of about 8 × 104 rad/s in the ion diamagnetic drift direction. The contribution of the mode to the turbulent particle flux ΓE×B for the observed wave vectors kθ < 3 cm−1 was found to be small in comparison with the contribution from broadband turbulence.
著者
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CASTEJÓN Francisco
Laboratorio Nacional de Fusión-Asociación Euratom/Ciemat, Madrid 28040, Spain
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Cappa Alvaro
Laboratorio Nacional De Fusion Ciemat
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NAGAOKA Kenichi
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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OHSHIMA Shinsuke
Institue of Laser Engineering, Osaka U
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Yamamoto Satoshi
Institute For Sea Training
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NAGAOKA Kenichi
National Institute for Fusion Science
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ASCASIBAR Enrique
Laboratorio Nacional de Fusión. CIEMAT. Avenida Complutense 22, 28040 Madrid, Spain
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OCHANDO Maria
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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PEDROSA Maria
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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ESTRADA Teresa
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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MELNIKOV Alexander
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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ELISEEV Leonid
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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HIDALGO Carlos
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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LYSENKO Sergey
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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PABLOS Jose
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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PABLOS Jose
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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HIDALGO Carlos
Laboratorio Nacional de Fusión Asociación Euratom/Ciemat, 28040 Madrid, Spain
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LYSENKO Sergey
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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ELISEEV Leonid
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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CAPPA Alvaro
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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ASCASIBAR Enrique
Laboratorio Nacional de Fusión por Confinamiento Magnético Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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CASTEJÓN Francisco
Laboratorio Nacional de Fusión Asociación Euratom/Ciemat, 28040 Madrid, Spain
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MELNIKOV Alexander
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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