Diffusion and incidence of helium on tungsten surface

doi:10.1016/j.jnucmat.2023.154689

	Diffusion and incidence of helium on tungsten surface
	Wang, Jinlong 3,4; Guo, Jinmin 4; He, Bingling 2; Liu, Daping 1; Pan, Xin-Dong 3; Li, Xiao-Chun 3; Luo, Guang-Nan 3
刊名	JOURNAL OF NUCLEAR MATERIALS
	2023-12-01
卷号	586
关键词	Tungsten Helium Irradiation energy Diffusion barrier Depth distribution
ISSN号	0022-3115
DOI	10.1016/j.jnucmat.2023.154689
通讯作者	Li, Xiao-Chun(xcli@ipp.ac.cn)
英文摘要	In this study, we investigated the diffusion and incidence of helium on tungsten surfaces using first principles and molecular dynamics methods. For three common tungsten surfaces (100, 111, 110), we found that the diffusion barrier of helium is positively/negatively correlated with the interatomic spacing/surface atomic density. The diffusion barriers of helium are relatively similar on the three surfaces, ranging from 5.82 to 6.50 eV. The diffusion barrier of helium on the tungsten surface represents the lower limit of the incidence barrier for helium implantation into tungsten. In our simulation, only helium with an incidence energy greater than 7 eV has the potential to be implanted into tungsten. Generally speaking, the implantation ratio of helium increases with increasing incidence energy and decreases with increasing substrate temperature (although the effect is minor). At a constant temperature, the implantation ratio of helium exhibits an exponential relationship with the incidence energy. The depth distribution of helium can be well described by Gamma distribution function, and the shape and scale parameters of the gamma distribution function can be determined based on the mean and variance of the helium depth distribution. The proposed fitting function allows for the quantitative description of the mean and variance of the helium depth distribution based on the incidence conditions (incident energy E and substrate temperature T), thereby determining the helium depth distribution. This has important implications for the in-depth study of helium-induced tungsten surface fuzz formation.
资助项目	National Natural Science Foundation of China[11975260] ; National Natural Science Foundation of China[12192281] ; National Natural Science Foundation of China[12204150] ; Anhui Province postdoctoral researchers research activities funding project, People's Republic of China[2021A481] ; China Postdoctoral Science Foundation[2021M703252] ; HFIPS Director's Fund[YZJJ2022QN21]
WOS关键词	ELASTIC BAND METHOD ; LOW-ENERGY ; MOLECULAR-DYNAMICS ; BUBBLE FORMATION ; DISSOLUTION ; DEPENDENCE ; POINTS
WOS研究方向	Materials Science ; Nuclear Science & Technology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:001075971300001
资助机构	National Natural Science Foundation of China ; Anhui Province postdoctoral researchers research activities funding project, People's Republic of China ; China Postdoctoral Science Foundation ; HFIPS Director's Fund
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/132616]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Xiao-Chun
作者单位	1.Xinxiang Univ, Dept Phys, Xinxiang, Peoples R China 2.Chaohu Univ, Sch Elect Engn, Hefei, Peoples R China 3.Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei, Peoples R China 4.Tongling Univ, Sch Elect Engn, Tongling, Peoples R China
推荐引用方式 GB/T 7714	Wang, Jinlong,Guo, Jinmin,He, Bingling,et al. Diffusion and incidence of helium on tungsten surface[J]. JOURNAL OF NUCLEAR MATERIALS,2023,586.
APA	Wang, Jinlong.,Guo, Jinmin.,He, Bingling.,Liu, Daping.,Pan, Xin-Dong.,...&Luo, Guang-Nan.(2023).Diffusion and incidence of helium on tungsten surface.JOURNAL OF NUCLEAR MATERIALS,586.
MLA	Wang, Jinlong,et al."Diffusion and incidence of helium on tungsten surface".JOURNAL OF NUCLEAR MATERIALS 586(2023).