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Integrated discharge scenario for high-temperature helical plasma in LHD

K. Nagaoka, H. Takahashi, S. Murakami, H. Nakano, Y. Takeiri, H. Tsuchiya, M. Osakabe, K. Ida, M. Yokoyama, M. Yoshinuma2015年被引用 39Nuclear FusionIF 3出版社

The discharge scenario of high temperature plasma with a helical configuration has significantly progressed. The increase of central ion temperature due to the reduction of wall recycling was clearly observed. The peaking of the ion heating profile and the reduction of charge exchange loss of energetic ions play an important role for further improvement of ion heat transport in the ion internal transport barrier (ITB) core. The ion ITB and electron ITB have been successfully integrated due to the superposition of centrally focused electron cyclotron heating to the ion ITB plasma, and the high temperature regime of the ion temperature comparable to the electron temperature (Ti ~ Te) has been significantly extended. The width of the ion ITB formed with electron ITB is wider than the width of electron ITB. The positive radial electric field was observed in the integrated ITB plasma by a heavy ion beam probe, while the negative radial electric field was observed in ion ITB plasmas. The ion temperature gradient decreases with the increase of the temperature ratio (Te /Ti).

日本語訳

ヘリカル配位を有する高温プラズマの放電シナリオは、大幅に進展した。壁リサイクリングの低減による中心イオン温度の上昇が明確に観測された。イオン加熱分布のピーキングと高エネルギーイオンの荷電交換損失の低減は、イオン内部輸送障壁(ITB)コアにおけるイオン熱輸送のさらなる改善に重要な役割を果たす。イオンITBと電子ITBは、イオンITBプラズマへの中心集束電子サイクロトロン加熱の重畳により、統合に成功し、イオン温度が電子温度に匹敵する高温領域(Ti ~ Te)が大幅に拡張された。電子ITBとともに形成されたイオンITBの幅は、電子ITBの幅よりも広い。重イオンビームプローブにより、統合ITBプラズマにおいて正の径方向電界が観測された一方、イオンITBプラズマでは負の径方向電界が観測された。イオン温度勾配は、温度比(Te/Ti)の増加とともに減少する。

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