Potassium-doped tungsten (KW), as an advanced candidate for first wall material, was developed to mitigate intrinsic embrittlement of bulk W. The addition of gaseous potassium bubbles (KBs) was known to act as effective barrier to the motion of irradiation damage and grain boundaries (GBs). The irradiation response to the He/H synergistic effect and the role of KBs on damage defects were two key issues when evaluating the performance of KW in future fusion reactors. In this work, KW was in-situ irradiated by 30 keV He⁺ and H₂⁺ with He/H ratios of 2.5, 0.5, and 0.1 at 823 K. The synergy of He, H, and damage defects were discussed. The number density and the average size of irradiation-induced loops and bubbles nearby KBs, nearby GBs, and within the matrix was quantified. Increasing the ratio of H to He enhanced the nucleation sites of loops and promoted the accumulation rates of bubbles. The formation of a loop denuded zone nearby a KB was related to the KB size. The difference between the loop denuded zones nearby KBs and GBs was found. The estimated sink strengths of KBs and GBs were in line with our experimental results.

掺钾钨(KW) 作为第一壁材料的先进候选材料，被开发用于减轻块体 W 的固有脆化。已知添加气态钾气泡 (KBs) 可作为辐射损伤运动的有效屏障和晶界 (GB)。对 He/H 协同效应的辐照响应和 KBs 对损伤缺陷的作用是评估 KW 在未来聚变反应堆中的性能时的两个关键问题。^{在这项工作中，KW 被 30 keV He +}和 H ₂ ⁺原位辐照在 823 K 时，He/H 比率分别为 2.5、0.5 和 0.1。讨论了 He、H 和损伤缺陷的协同作用。量化了 KB 附近、GB 附近和矩阵内辐射引起的环路和气泡的数量密度和平均大小。增加 H 与 He 的比例可增强环的成核位点并促进气泡的积累速率。KB 附近环路剥离区的形成与 KB 大小有关。发现了 KBs 和 GBs 附近的循环剥蚀区之间的差异。KB 和 GB 的估计汇强度与我们的实验结果一致。