Dynamics of Plasma during the Formation of a Weak Negative Central Magnetic Shear Configuration Using Counter Neutral Beam Injection in the JFT-2M Tokamak.
スポンサーリンク
概要
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In the JFT-2M tokamak, discharges exhibiting good performance have been produced by counter-NBI after boronization. An improved core confinement mode under an H-mode edge condition is sustained for ˜5 τE with H89P˜1.5 and β N˜2.0 at a line-averaged electron density of around 70% - 80% of the Greenwald density limit. It is found that the q-profile changes from a monotonic one having q0˜1 to a zero or weak negative central magnetic shear configuration having 1 < qmin ≤ q0 < 3 during improved core confinement mode using counter-NBI under an H-mode edge condition. The central electron temperature very clearly increases when the sawtooth activity disappears, while the previous result without boronization exhibited a significant degradation of the energy confinement due to the accumulation of impurities. The mechanism governing the improved core confinement mode including the density peaking and/or ITB formation due to negative shear is presently unclear.
- プラズマ・核融合学会の論文
著者
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KAMIYA Kensaku
Japan Atomic Energy Agency, Naka, Ibaraki 311-0193, Japan
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Kimura Haruyuki
Japan Atomic Energy Research Institute
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ISEI Nobuaki
Japan Atomic Energy Research Institute
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TSUZUKI Kazuhiro
Japan Atomic Energy Research Institute
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Sato Masayasu
Japan Atomic Energy Research Institute
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OGAWA Hiroaki
Japan Atomic Energy Agency, Naka, Ibaraki 310-0193, Japan
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OGAWA Hiroaki
Japan Atomic Energy Research Institute
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SHINOHARA Kouji
Japan Atomic Energy Agency
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KAWASHIMA Hisato
Japan Atomic Energy Agency
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KAMIYA Kensaku
Japan Atomic Energy Agency
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- Dynamics of Plasma during the Formation of a Weak Negative Central Magnetic Shear Configuration Using Counter Neutral Beam Injection in the JFT-2M Tokamak.