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A repetitive pellet injection system for JT-60U

K Kizu, N Hosogane, H Hiratsuka, H Ichige, P.T Lang2001年Fusion Engineering and DesignIF 1.7出版社

AbstractA centrifugal pellet injector and a guide tube for magnetic high-field side (HFS) injection were developed in JT-60U. The injector can eject trains of up to 40 cubic (1.9 mm)3 deuterium pellets at frequencies of 1–10 Hz and velocities of 0.2–1.0 km/s. Pellet injection experiments into ohmic heating (OH) plasma were performed. From plasma density measurement, central fueling and enhanced fueling rate compared to gas puffing were observed for magnetic low-field side (LFS) injections. The results of HFS injection through the guide tube connected to the upper port of the vessel showed that the pellet velocity exceeding 220 m/s caused pellet destruction inside the tube.

日本語訳

遠心式ペレット入射装置と、磁場高磁場側(HFS)への入射用ガイド管をJT-60Uにおいて開発した。本入射装置は、毎秒1~10Hzの周波数で、毎秒0.2~1.0kmの速度を持つ、最大40個の直径1.9mmの重水素ペレット列を射出することができる。オーミック加熱(OH)プラズマへのペレット入射実験を実施した。プラズマ密度測定から、磁場低磁場側(LFS)への入射において、中心部への燃料供給と、ガス噴射と比較した場合の燃料供給速度の向上が観測された。容器上部ポートに接続されたガイド管を通じたHFS入射の結果、毎秒220mを超えるペレット速度では、管内でのペレット破壊が生じることが示された。

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JT-60UPellet injection
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