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Studies of lithium deposition and D retention on tungsten samples exposed to Li-seeded plasmas in PISCES-A

F L Tabarés, D Alegre, M Baldwin, D Nishijima, M Simmonds, R Doerner, E Alves, R Mateus2017年Plasma Physics and Controlled FusionIF 2.2出版社

The interaction between lithium-seeded deuterium plasmas and tungsten targets has been studied in the PISCES-A divertor plasma simulator. Tungsten samples, of ITER-grade, with a diameter of 25 and 2 mm thick, were held at temperatures ranging from 403 to 873 K and exposed to Li/D plasmas under different plasma conditions and fixed total fluences of 5 ×1025 m−2, with typical particle flux values of (1–5) × 1022 m−2 s−1. The deuterium and lithium contents of the samples after irradiation were analyzed by thermal desorption spectroscopy  and nuclear reaction analysis (NRA). No lithium deposition was found within the sensitivity range of NRA, except for the cold (403 K) sample on which a layer with Li atomic density below 2 × 1022 m−2 was detected. Deuterium retention values in the range of 1018 m−2 were measured, even for the Li deposition conditions.

日本語訳

リチウムをシードした重水素プラズマとタングステンターゲットとの相互作用を、PISCES-Aダイバータ模擬装置において研究した。ITERグレードのタングステン試料(直径25mm、厚さ2mm)を403〜873Kの温度範囲に保持し、異なるプラズマ条件下でLi/Dプラズマに曝露した。総フルエンスは5×10²⁵ m⁻²で固定し、典型粒子フラックスは(1〜5)×10²² m⁻² s⁻¹とした。照射後の試料中の重水素およびリチウム含有量を、熱脱離分光法および核反応分析法(NRA)により分析した。NRAの感度範囲内では、403Kの低温試料を除き、リチウムの堆積は検出されなかった。低温試料では、2×10²² m⁻²未満のリチウム原子密度を持つ層が検出された。重水素の保持量は10¹⁸ m⁻²の範囲で測定され、これはリチウム堆積条件下でも同様であった。

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