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Influence of Li and B coatings of metal walls on deuterium retention and plasma confinement in HT-7

H.Y. Wang, J.S. Hu, X. Gao, B. Cao, J. Li, B. Pégourié, HT-7 Vacuum and Wall Conditioning Group2012年被引用 5Nuclear FusionIF 3出版社

In winter 2010, the carbon plasma-facing components (PFCs) of HT-7 were changed for molybdenum PFCs. The surface area of the wall that was covered with Mo was about 1.28 m2. In the following experimental campaign, the plasma was first operated with Mo PFCs; then 28 successive lithium coatings were carried out (for a total of 350 g Li); finally, 3 g of carborane were filmed to the PFCs. In each phase, the characteristics of hydrogenic species retention were investigated as well as the energy confinement and recycling properties, offering a good opportunity for comparing similar discharges. With Mo PFCs, significant wall outgassing is generally observed and, in all cases, less than 10% of the puffed fuel is trapped, corresponding to a retention rate of around a few Pa l s−1 (1018 atom s−1); energy confinement is poor, mainly due to huge central radiation. When the PFCs are covered by lithium, about 40–80% of the puffed gas is trapped and the retention rate is 102–103 Pa l s−1 (1020–1021 atom s−1); good confinement properties are recorded, and the radiation remains located at the edge. After boronization, about 70–80% of the puffed deuterium is trapped and the retention rate is a few 102 Pa l s−1 (1020 atom s−1); the energy confinement is not as good as with Li coating, and significant radiation is measured in the plasma core.

日本語訳

2010年冬、HT-7の炭素製プラズマ対向機器(PFC)はモリブデン製PFCに交換された。Moで被覆された壁の表面積は約1.28 m²であった。その後の実験キャンペーンでは、まずMo製PFCでプラズマ運転が行われ、次に28回のリチウム被覆(合計350 gのLi)が施され、最後に3 gのカルボランがPFCに成膜された。各段階において、水素同位体種の保持特性が調査されるとともに、エネルギー閉じ込め特性とリサイクリング特性が調べられ、類似した放電の比較が可能となった。Mo製PFCでは、一般に顕著な壁からの放出ガスが観測され、すべての場合においてパフされた燃料の10%未満しか捕捉されず、これは数 Pa·l·s⁻¹(10¹⁸ atom·s⁻¹)程度の保持率に相当する。また、エネルギー閉じ込めは劣悪であり、主に大きな中心部放射に起因する。PFCがリチウムで被覆された場合、パフされたガスの約40〜80%が捕捉され、保持率は10²〜10³ Pa·l·s⁻¹(10²⁰〜10²¹ atom·s⁻¹)であった。閉じ込め特性は良好であり、放射は周辺部に留まった。ボロン化後は、パフされた重水素の約70〜80%が捕捉され、保持率は数10² Pa·l·s⁻¹(10²⁰ atom·s⁻¹)程度であった。エネルギー閉じ込めはLi被覆時ほど良好ではなく、プラズマコアにおいて顕著な放射が測定された。

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DeuteriumPlasma confinementDeuterium retentionHT-7
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