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Real-time wall conditioning and recycling modification utilizing boron and boron nitride powder injections into the Large Helical Device

R. Lunsford, S. Masuzaki, F. Nespoli, N. Ashikawa, E.P. Gilson, D.A. Gates, K. Ida, G. Kawamura, T. Morisaki, A. Nagy2022年被引用 8Nuclear FusionIF 3出版社

Controlled particulate injections from the PPPL impurity powder dropper (IPD) into the Large Helical Device have demonstrated positive effects on the wall conditions on both an intra and inter-shot basis. Injections over a range of densities, input powers, pulse lengths, heating schemes, injection quantities and main ion species show conclusive evidence of improvement to plasma wall conditions. Successful injections are confirmed by both spectroscopic measurements as well as real-time visible camera signals. In 7 s long plasmas the responses include a reduction in wall recycling as well as a reduction in native impurity content as observed over the course of several discharges. For plasmas longer than 40 s, improvements to the recycling rate and increased impurity control are observed in real time as a consequence of the extended particulate injections. These experiments demonstrate the extended applicability of this solid particulate conditioning technique to the control and maintenance of the plasma wall conditions. In addition they are an important initial step in the development of the real-time boronization technique as a supplement to standard conditioning scenarios.

日本語訳

PPPL不純物パウダードロッパー(IPD)から大型ヘリカル装置への制御された粒子状注入は、ショット内およびショット間の両方の基準において、壁状態に対する良好な効果を示してきた。密度、入力パワー、パルス長、加熱方式、注入量、および主イオン種の範囲にわたる注入は、プラズマ壁状態の改善の決定的な証拠を示している。成功した注入は、分光測定とリアルタイム可視カメラ信号の両方によって確認されている。7秒のプラズマでは、その応答には、数回の放電にわたって観測される壁リサイクリングの低減および自然不純物含有量の低減が含まれる。40秒を超えるプラズマでは、リサイクリング率の改善と不純物制御の向上が、拡張された粒子状注入の結果としてリアルタイムで観測される。これらの実験は、プラズマ壁状態の制御および維持に対するこの固体粒子状調整技術の拡張された適用可能性を示している。さらに、これらは、標準的な調整シナリオを補完するものとしてのリアルタイムボロナイゼーション技術の開発における重要な初期段階である。

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Helical deviceRecyclingWall conditioning
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