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Material transport by erosion and redeposition on surface probes in the scrape-off layer of JET

D. Naujoks, R. Behrisch, J.P. Coad, L.C.J.M. De Kock1993年被引用 62Nuclear FusionIF 3出版社

The material transport by erosion and redeposition at the plasma facing wall areas in high temperature plasma experiments has been studied using limiter-like carbon probes with well defined surface deposits and depth markers. The probes have been exposed in the scrape-off layer (SOL) of the Joint European Torus (JET) during single discharges. For the evaluation of these experiments a computer program, ERO, has been developed. The calculated erosion-deposition rates for carbon as a function of the distance to the last closed flux surface (LCFS) agree well with the experimental results. For a single 4He JET discharge, erosion yields of 530 Å for the silicon deposit and 80 Å for vanadium have been measured near the LCFS. A large amount of redeposited silicon (about 17% of the sputtered atoms) has been found on the probe surface in co-deposition with carbon on an area not favoured by the proposed model. This observation can be explained by an additional force on the impurity ions (e.g. the existence of a local electric field), which may cause the deposition

日本語訳

高温プラズマ実験におけるプラズマ対向壁領域での侵食と再堆積による物質輸送を、明確な表面構造と深さマーカーを有するリミター状炭素プローブを用いて研究した。プローブは、単一放電中にJET(ジョイント・ヨーロピアン・トーラス)のスクレイプオフ層(SOL)に曝露された。これらの実験の評価のために、コンピュータプログラムEROが開発された。最終閉鎖磁気面(LCFS)からの距離の関数としての炭素の侵食・再堆積速度の計算結果は、実験結果とよく一致した。単一の4He JET放電において、LCFS近傍でシリコン堆積物の侵食収量が530Å、バナジウムのそれが80Åと測定された。再堆積したシリコンの大量(スパッタリングされた原子の約17%)が、提案されたモデルでは説明できない領域で、炭素との共堆積としてプローブ表面に観察された。この観察結果は、不純物イオンに働く追加の力(例えば、局所電場の存在)によって説明できる可能性があり、これが堆積を引き起こす可能性がある。

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JETScrape-off layer
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