Turbulence Transition and Its Role in Isotope Effects of LHD
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- 木下, 稔基
- 九州大学応用力学研究所
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- Tanaka, K.
- 自然科学研究機構核融合科学研究所 九州大学大学院総合理工学府
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- Ishizawa, A.
- 京都大学大学院エネルギー科学研究科
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- Nunami, M.
- 自然科学研究機構核融合科学研究所 京都大学大学院エネルギー科学研究科
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- Sakai, H.
- 九州大学大学院総合理工学府
説明
In this study, we discover a turbulence transition and its role in the isotope effects in the Large Helical Device (LHD). The turbulence levels and turbulence-driven transports decrease with an increase in the electron density to a specific density; however, they increase in regimes above the density. Density scan experiments and gyrokinetic/MHD simulations reveal that the observed ion-scale turbulence is the ion-temperature gradient (ITG) turbulence below the density and resistive-interchange (RI) above the density. Negligible isotope effects in the turbulences and transports of hydrogen (H) and deuterium (D) plasma were found in the ITG regime. However, clear isotope effects were observed in the RI regime. In the RI regime, the turbulences and transports were clearly suppressed, and the confinements were improved in D plasma. The reduction of the turbulence level in the RI regime of the D plasma is likely due to the heavier ion mass and lower resistivity in D plasma, which suppress the linear growth rate of RI turbulence.
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詳細情報 詳細情報について
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- CRID
- 1050019357983574656
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- HANDLE
- 2324/7183316
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- 本文言語コード
- en
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- 資料種別
- conference paper
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- データソース種別
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- IRDB