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Interpretive modelling of boron transport in the boundary plasma of WEST experiments with the impurity powder dropper

K. Afonin, A. Gallo, Y. Marandet, Ph. Moreau, G. Bodner, H. Bufferand, G. Ciraolo, C. Desgranges, P. Devynck, A. Diallo2023年被引用 1Nuclear FusionIF 3出版社

Boron (B) powder injection is a potential alternative to glow discharge boronization as a wall conditioning method for tokamaks. This technique is currently being studied in WEST experiments, during which B powder is injected by an Impurity Powder Dropper developed by PPPL. In order to interpret and analyse experimental trends, and to help develop future experiments, a modelling workflow using a boundary plasma simulation (SOLEDGE-EIRENE) and powder ablation simulation (Dust Injection Simulator) was developed and tested. The effect of adding a B neutral source to simulated deuterium + oxygen (D + O) plasmas was compared to experimental data from the WEST C5 campaign, where B powder was injected in a dedicated experiment. While the impact of B injection on radiated power measurements at the upper divertor was similar, there were significant differences in measurements of , outer strike point electron temperature and O-II line intensity at the lower divertor between experiment and simulation. This discrepancy suggests that those parameters were affected by phenomena not present in the simulations, with the most likely candidates being reduced D recycling and a reduced O sourcing from the divertor.

日本語訳

ボロン(B)粉末注入は、トカマクの壁調整方法としてのグロー放電ボロナイゼーションに代わる有望な選択肢である。この技術は現在、WEST実験で研究されており、その際にB粉末はPPPLによって開発されたImpurity Powder Dropperによって注入される。実験の傾向を解釈・分析し、将来の実験の開発を支援するために、境界プラズマシミュレーション(SOLEDGE-EIRENE)と粉末アブレーションシミュレーション(Dust Injection Simulator)を用いたモデリングワークフローが開発され、テストされた。シミュレートされた重水素+酸素(D + O)プラズマにB中性粒子源を追加した効果は、専用実験でB粉末が注入されたWEST C5キャンペーンの実験データと比較された。B注入が上部ダイバータでの放射パワー測定に与える影響は同様であったが、外側ストライク点電子温度および下部ダイバータにおけるO-IIライン強度の測定値には、実験とシミュレーションの間で有意な差があった。この不一致は、これらのパラメータがシミュレーションには存在しない現象の影響を受けたことを示唆しており、最も可能性の高い候補は、Dリサイクリングの低減とダイバータからのO供給源の低減である。

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