Simulations of tungsten fuzz growth and erosion under He/Ar mixed plasma irradiation on LP-MIES

IF 2.3 2区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Materials and Energy Pub Date : 2024-10-30 DOI:10.1016/j.nme.2024.101797

K.R. Yang , J.Y. Chen , C.R. Zu , W.Y. Ni , D.P. Liu , S.G. Liu , B. Cui , S.Y. Dai

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Abstract

Extrinsic noble impurities seeding has been commonly used to reduce the heat flux on divertor target. However, the physical sputtering yield on the target could be obviously enhanced due to larger mass of noble impurities. On the other hand, it has been reported that tungsten fuzz can suppress the physical sputtering due to the trapping effect on sputtered particles. Hence, it is interesting to check the erosion behaviors of tungsten fuzz under the irradiation of noble impurities. Recently, experiments of He/Ar mixed plasma irradiation on W target were conducted on LP-MIES device. Dedicated simulations have been performed by SURO-FUZZ code to study the impact of Ar flux on fuzz growth and erosion, which can well reproduce the experimental measurements on LP-MIES. For the case of pure He incidence, the growth of porous nanostructure leads to an obvious reduction in the fraction of the implanted He particles, which stabilizes to 15 % when the fuzz layer thickness exceeds 1500 nm. For He/Ar mixed plasma irradiation, the dependence of the position of the net sputtering on the local porosity has been investigated in detail. It is found that the net physical sputtering mainly occurs in the regions with the local porosity larger than 0.6.

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在 LP-MIES 上模拟 He/Ar 混合等离子体辐照下钨毛细管的生长和侵蚀

外来惰性杂质播种通常用于降低分流靶上的热通量。然而，由于惰性杂质的质量较大，靶上的物理溅射产率会明显提高。另一方面，据报道，钨毛细管由于对溅射粒子的捕获作用，可以抑制物理溅射。因此，研究钨毛细管在惰性杂质辐照下的侵蚀行为很有意义。最近，在 LP-MIES 设备上进行了 He/Ar 混合等离子体辐照 W 靶的实验。SURO-FUZZ代码进行了专门的模拟，研究了Ar通量对模糊生长和侵蚀的影响，很好地再现了LP-MIES上的实验测量结果。在纯 He 入射的情况下，多孔纳米结构的生长导致植入 He 粒子的比例明显下降，当模糊层厚度超过 1500 nm 时，这一比例稳定在 15%。对于 He/Ar 混合等离子体辐照，我们详细研究了净溅射位置与局部孔隙率的关系。研究发现，物理净溅射主要发生在局部孔隙率大于 0.6 的区域。

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来源期刊

Nuclear Materials and Energy Materials Science-Materials Science (miscellaneous)

CiteScore

3.70

自引率

15.40%

发文量

175

审稿时长

20 weeks

期刊介绍： The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.