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FTU results with a liquid lithium limiter

G. Mazzitelli, M.L. Apicella, D. Frigione, G. Maddaluno, M. Marinucci, C. Mazzotta, V. Pericoli Ridolfini, M. Romanelli, G. Szepesi, O. Tudisco2011年被引用 72Nuclear FusionIF 3出版社

Since the end of 2005 most of the plasma–wall interaction experiments on FTU have been focused on the possible use of liquid lithium as the plasma facing material. Liquid lithium limiter is an active method to deposit, during the plasma discharge, a lithium film on the walls with prolonged beneficial effects. Reliable operation with very clean plasmas, very low wall particle recycling, spontaneous peaking of the density profile for line-averaged density values have been obtained. These results have allowed us to extend the density limit to the highest value so far obtained ( at Ip = 0.7 MA and BT = 7.1 T, qa = 5.0, by gas puffing only) and to increase the energy confinement time by almost 50% with respect to the average value of 50 ms of the old ohmic FTU database. An accurate analysis of these plasmas has been carried out by means of a gyrokinetic code to establish the role of collisionality and density gradients on the observed phenomenology.

日本語訳

2005年末以降、FTUにおけるプラズマ–壁相互作用実験の大部分は、液体リチウムをプラズマ対向材料として使用する可能性に焦点を当ててきた。液体リチウムリミッターは、プラズマ放電中にリチウム膜を壁面に堆積させる能動的な方法であり、長期的な有益効果をもたらす。非常に清浄なプラズマ、極めて低い壁粒子リサイクリング、線平均密度値に対する密度分布の自発的なピーキングを伴う信頼性の高い運転が達成された。これらの結果により、密度限界をこれまでに得られた最高値(Ip = 0.7 MA、BT = 7.1 T、qa = 5.0において、ガスパフのみによる)まで拡張し、エネルギー閉じ込め時間を旧オーミックFTUデータベースの平均値50 msに対して約50%向上させることが可能となった。観測された現象における衝突頻度と密度勾配の役割を確立するため、ジャイロ運動論コードを用いてこれらのプラズマの精密な解析が実施された。

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LithiumLimiterLiquid lithiumFTU
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