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Particle confinement of lower hybrid current driven plasmas and electron cyclotron heated plasmas in the WT-3 tokamak

M. Nakamura, T. Minami, K. Hanada, M. Iida, S. Ide, H. Tanaka, T. Maekawa, Y. Terumichi, S. Tanaka1991年被引用 9Nuclear FusionIF 3出版社

Confinement properties of lower hybrid current driven (LHCD) plasmas and electron cyclotron heated (ECH) plasmas in the WT-3 tokamak are studied. The outward particle and energy fluxes are estimated from parameters of the scrape-off layer (SOL) plasma. During the LHCD period the density and temperature of the SOL plasma decrease drastically, while the density of the core plasma increases, suggesting a decrease of the outward flux. These results show that particle confinement is improved by LHCD. On the contrary, during ECH the density of the SOL plasma increases and the density of the core plasma decreases, suggesting a deterioration of particle confinement. Improved confinement is not obtained near the density limit of LHCD; the improvement is not related with MHD activities during LHCD.

日本語訳

WT-3トカマクにおける低混成波電流駆動(LHCD)プラズマおよび電子サイクロトロン加熱(ECH)プラズマの閉じ込め特性を研究した。スクレイプオフ層(SOL)プラズマのパラメータから外向きの粒子およびエネルギー束を推定した。LHCD期間中、SOLプラズマの密度と温度は劇的に減少する一方、コアプラズマの密度は増加し、外向きの粒子束の減少を示唆している。これらの結果は、粒子閉じ込めがLHCDによって改善されることを示している。逆に、ECH期間中はSOLプラズマの密度が増加し、コアプラズマの密度が減少して、粒子閉じ込めの悪化を示唆している。LHCDによる閉じ込め改善は密度限界付近では得られず、この改善はLHCD中のMHD活動とは関連していない。

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