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Designing the X-divertor configurations for the China Fusion Engineering Test Reactor

H Li, G Q Li, X J Liu, H Xie, J P Qian, X Gao, J J Huang2020年Plasma Physics and Controlled FusionIF 2.2出版社

It has been found that the X-divertor (XD) configuration can flare magnetic field lines near the divertor targets and reduce heat flux on the divertor plate (Kotschenreuther 2007 Phys. Plasmas14 072502). To solve severe heat exhaust problems in the China Fusion Engineering Test Reactor, the XD configuration is proposed. Equilibria calculations indicate that the XD can be realized and is compatible with the long-leg divertor. The position of the extra X-point was optimized to reduce the currents in the central solenoid (CS) coils, which dominates the flattop length. Two internal coils were considered to assist in the optimization of the XD. Different plasma currents were also used to further reduce the CS coil currents. The results indicate that the aforementioned approaches can effectively extend the flattop.

日本語訳

Xダイバータ(XD)配位は、ダイバータターゲット近傍の磁力線をフレアさせ、ダイバータ板上の熱流束を低減できることが見出されている(Kotschenreuther 2007 Phys. Plasmas 14 072502)。中国核融合工学試験炉における深刻な排熱問題を解決するため、XD配位が提案されている。平衡計算により、XDは長レッグダイバータと両立可能であり、追加のX点位置は中央ソレノイド(CS)コイル電流を低減するように最適化された。この最適化を支援するため、2つの内部コイルが検討された。さらに、異なるプラズマ電流を用いてCSコイル電流のさらなる低減を試みた。結果は、前述の手法がフラットトップを効果的に延長できることを示している。

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