Study of Alfvén Eigenmodes in the TJ-II Stellarator
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概要
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Energetic ion driven Alfvén Eigenmodes (AEs) in the NBI-heated plasma at the TJ-II heliac were studied by Heavy Ion Beam Probing (HIBP) in the core, and by Langmuir and Mirnov probes (LP and MP) at the edge. HIBP observed the locally (∼ 1 cm) resolved AE at radii -0.5 < ρ < 0.9. The set of AE branches with low poloidal numbers (m < 8) was detected by MP. The most plausible candidates are global, helical and toroidal AEs. AEs on the density, electric potential and poloidal magnetic field oscillations were detected by HIBP at frequencies 50 kHz < fAE < 300 kHz with a high resolution (< 5 kHz). The amplitude of the AE potential oscillations δφAE ∼ 10 V was estimated. The MP and HIBP data have a high coherency at fAE. When the density rises, AE frequency is decreasing, fAE ∼ ne−1/2, but the cross-phase between the density and potential remains permanent. Poloidally resolved potential measurements by HIBP and LP shows high coherency and finite cross-phase at fAE, resulting in finite electric field δEpol. Depending on the cross-phase between δne and δEpol, AEs may bring small or significant contribution to the turbulent particle flux ΓE×B for the observed kθ < 3 cm−1.
著者
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Smolyakov Andrei
University of Saskatchewan
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Yamamoto Satoshi
Institute For Sea Training
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Ido Takeshi
National Inst. For Fusion Sci. Toki 509-5292 Jpn
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OCHANDO Maria
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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PEDROSA Maria
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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LINIERS Macarena
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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LYSENKO Sergey
Institute of Tokamak Physics, NRC "Kurchatov Institute", 123182, Moscow, Russia
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PABLOS Jose
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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HIDALGO Carlos
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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LYSENKO Sergey
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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ELISEEV Leonid
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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JIMÉNEZ-GÓMEZ Ruben
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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ASCASIBAR Enrique
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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CHMYGA Alexander
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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KHREBTOV Sergey
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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KÖNIES Axel
Max-Planck-Institut für Plasmaphysik, EURATOM-Association, D-17491, Greifswald, Germany
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KOMAROV Alexander
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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KOZACHEK Alexander
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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KRASILNIKOV Ivan
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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KRUPNIK Ludmila
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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MAVRIN Victor
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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NAGAOKA Keinichi
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
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PERFILOV Stanislav
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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TASCHEV Yuri
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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UFIMTSEV Mikhail
Department of Computational Mathematics and Cybernetics, Moscow State University, Russia
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ZHEZHERA Alexander
Institute of Plasma Physics, NSC KIPT, 310108, Kharkov, Ukraine
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MAVRIN Victor
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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KRASILNIKOV Ivan
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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PERFILOV Stanislav
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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MELNIKOV Alexander
Institute of Tokamak Physics, RRC "Kurchatov Institute", 123182, Moscow, Russia
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SMOLYAKOV Andrei
University of Saskatchewan, 116 Science Place, Saskatoon SK S7N 5E2, Canada
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ASCASIBAR Enrique
Asociación EURATOM-CIEMAT, 28040, Madrid, Spain
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PERFILOV Stanislav
Institute of Tokamak Physics, NRC "Kurchatov Institute"
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