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Erosion of Be as plasma-facing material

Joachim Roth, Wolfgang Eckstein, Maria Guseva1997年Fusion Engineering and DesignIF 1.7出版社

AbstractThe knowledge of the erosion of Be, BeO, Be2C, and Be4B due to ion bombardment is reviewed. The sputtering yield values obtained experimentally and by computer simulation are given for H, D, T, He, Be, C, O, Ne, and Ar bombardment. The dependence of the yield on ion energy and angle of incidence is discussed as well as the influence of the target temperature and surface roughness. For the case of C and O bombardment the result of surface composition changes due to accumulation of incident ions in the surface layer is discussed and effects due to simultaneous bombardment of hydrogen and C impurity ions are described. Finally, Be is compared to other potential plasma facing materials, such as graphite or tungsten, on the basis of the ratio of the tolerable plasma impurity concentration to the sputtering yield. The effects of a Maxwellian incident energy distribution of deuterium ions or the energy distribution typical for charge exchange neutral deuterium atoms are taken into account. Consequences for the use of Be in future fusion plasma experiments are regarded.

日本語訳

要約:イオン衝撃によるBe、BeO、Be2C、およびBe4Bの侵食に関する知識がレビューされる。実験的およびコンピュータシミュレーションによって得られたスパッタリング収率の値が、H、D、T、He、Be、C、O、Ne、およびArの衝撃について与えられる。収率のイオンエネルギーと入射角への依存性が議論され、ターゲット温度と表面粗さの影響も同様に議論される。CおよびO衝撃の場合、表面層への入射イオンの蓄積による表面組成変化の結果が議論され、水素とC不純物イオンの同時衝撃による効果が説明される。最後に、Beは、許容可能なプラズマ不純物濃度とスパッタリング収率の比に基づいて、グラファイトやタングステンなどの他の潜在的なプラズマ対向材料と比較される。重水素イオンのマクスウェル入射エネルギー分布または電荷交換中性重水素原子に典型的なエネルギー分布の効果が考慮される。将来の核融合実験におけるBeの使用に対する結果が考慮される。

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