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Wave accessibility effects on lower hybrid current drive in JT-60U

Y. Ikeda, O. Naito, K. Ushigusa, M. Sato, T. Kondoh, S. Ide, M. Seki, K. Nagashima, S.W. Wolfe, N. Asakura1994年被引用 13Nuclear FusionIF 3出版社

The effects of the wave accessibility condition on lower hybrid current drive (LHCD) are investigated in JT-60U. The density dependence of the detectable maximum photon energy of hard X rays in LHCD plasmas is consistent with that of the maximum electron energy which is limited by the accessibility condition. The current drive efficiency and the driven current profile are affected by the accessibility condition. Inaccessible wave power enhances impurity content, particle recycling and main plasma radiation loss, and in extreme cases triggers a MARFE. The wave intensity on the plasma periphery, which is detected by a Langmuir probe located on the divertor plate, is also consistent with an inaccessible power fraction going into the plasma interior. A ray trace analysis taking account of toroidal effect indicates that the inaccessible wave power is localized on the plasma periphery and finally propagates into the divertor plasma region

日本語訳

低混波电流驱动(LHCD)における波動の到達可能性条件の効果をJT-60Uで調査した。LHCDプラズマにおける硬X線の検出可能な最大光子エネルギーの密度依存性は、到達可能性条件によって制限される最大電子エネルギーのそれと一致する。電流駆動効率および駆動電流分布は、到達可能性条件の影響を受ける。到達不可能な波動パワーは、不純物含有量、粒子リサイクリング、および主プラズマの放射損失を増大させ、極端な場合にはMARFEを誘発する。ダイバータ板上に設置されたラングミュアプローブによって検出されたプラズマ周辺部での波動強度は、プラズマ内部へ進入する到達不可能なパワー割合と一致する。トロイダル効果を考慮した光線追跡解析は、到達不可能な波動パワーがプラズマ周辺部に局在し、最終的にダイバータプラズマ領域へ伝播することを示している。

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Current driveLower hybridJT-60ULower hybrid current drive
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