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Operation at high performance in optimized shear plasmas in JET

A C C Sips, Y Baranov, C D Challis, G A Cottrell, L-G Eriksson, C Gormezano, C Gowers, C M Greenfield, J C M de Haas, M von Hellerman1998年Plasma Physics and Controlled FusionIF 2.2出版社

Heating during the early part of the current rise phase gives a low or negative magnetic shear (= (dq/dr)) in the centre of JET plasmas. Under these conditions the confinement improves with high additional heating power heating during the current ramp-up phase of the discharge. The reduction in the transport manifests itself as a peaking of the profiles with a large gradient region near = 0.55. The best discharges have no transport barrier at the edge of the plasma (L-mode). This allows central power deposition by the neutral beams in JET. A control of the plasma pressure, using feedback of the additional heating power in real-time, minimizes the impact of magnetohydrodynamic instabilities. As a result, these discharges achieve the highest D-D neutron rates in JET; , with , and .

日本語訳

電流立ち上げ初期における加熱は、JETプラズマの中心部において低いまたは負の磁気シア(= dq/dr)を与える。これらの条件下では、放電の電流立ち上げ位相における高い追加加熱パワーによる加熱によって閉じ込めが改善される。輸送の低減は、= 0.55付近に大きな勾配領域を持つ密度分布のピーキングとして現れる。最も優れた放電は、プラズマ端部に輸送障壁を持たない(Lモード)。これにより、中性粒子ビームによる中心部へのパワー堆積が可能となる。実時間での追加加熱パワーのフィードバック制御を用いたプラズマ圧力の制御は、MHD不安定性の影響を最小化する。その結果、これらの放電はJETにおいて最高のD-D中性子発生率を達成する;、および。

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