Instability in the Frequency Range of Alfvén Eigenmodes Driven by Negative-Ion-Based Neutral Beams in JT-60U
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- SHINOHARA Kouji
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- ISHIKAWA Masao
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- TAKECHI Manabu
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- KUSAMA Yoshinori
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- TODO Yasushi
- National Institute for Fusion Science
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- GORELENKOV Nikolai
- Princeton Plasma Physics Laboratory
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- CHENG Chio
- Princeton Plasma Physics Laboratory
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- FUKUYAMA Atsushi
- Department of Nuclear Engineering
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- KRAMER Gerrit
- Princeton Plasma Physics Laboratory
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- NAZIKIAN Raffi
- Princeton Plasma Physics Laboratory
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- MATSUNAGA Go
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- OZEKI Takahisa
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
Bibliographic Information
- Other Title
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- Instability in the Frequency Range of Alfven Eigenmodes Driven by Negative-Ion-Based Neutral Beams in JT-60U
- Instability in the Frequency Range of Alfvén Eigenmodes Driven by Negative-Ion-Based Neutral Beams in JT-60U
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Description
Alfvén eignemode experiments have been carried out by using the negative-ion-based neutral beam in JT-60U. For bursting instabilities in the frequency range of Alfvn Eigenmodes, two types of mode activity have been observed. In one type called Abrupt Large-amplitude Event (ALE), enhanced transport of the energetic ions was detected. The enhanced transport showed the clear energy dependence based on measurements performed using a natural diamond detector. In another type of bursting event called the fast Frequency Sweeping (fast FS) mode, frequency up-down chirping is observed on the time-scale of a few ms, much faster than equilibrium changes in the background plasma. This frequency chirping was well reproduced by the non-linear simulation code, MEGA, for magnetohydrodynamics (MHD) with energetic particles. The slow up-frequency sweeping of the Reversed-Shear-induced Alfvén Eigenmode (RSAEs), due to the slow evolution of qmin was also observed. These experiments were analyzed by using the NOVA-K code. It is shown that the most unstable modes are localized around the minimum in the magnetic safety factor (qmin) in the analysis.
Journal
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- Journal of Plasma and Fusion Research
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Journal of Plasma and Fusion Research 81 (7), 547-552, 2005
The Japan Society of Plasma Science and Nuclear Fusion Research
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Details 詳細情報について
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- CRID
- 1390282681488344576
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- NII Article ID
- 110006281952
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- NII Book ID
- AN10401672
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- COI
- 1:CAS:528:DC%2BD2MXps1Ciur4%3D
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- NDL BIB ID
- 7434837
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- ISSN
- 09187928
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL Search
- Crossref
- NDL Digital Collections (NII-ELS)
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed