Spectroscopic investigation of the tungsten deuteride sputtering in the EAST divertor

doi:10.1016/j.nme.2022.101265

	Spectroscopic investigation of the tungsten deuteride sputtering in the EAST divertor
	Zhang, Q.1,3; Ding, F.3; Brezinsek, S.2; Yu, L.1,3; Meng, L. Y.3; Zhao, P. A.1,3; Ye, D. W.1,3; Hu, Z. H.3; Zhang, Y.3; Ding, R.3
刊名	NUCLEAR MATERIALS AND ENERGY
	2022-10-01
卷号	33
关键词	Tungsten Plasma-facing materials Sputtering EAST Divertor
DOI	10.1016/j.nme.2022.101265
通讯作者	Ding, F.(fding@ipp.ac.cn)
英文摘要	Physical sputtering caused by particle bombardment is believed to be the main erosion mechanism of W materials in fusion devices, in which W atoms are the sputtering products. However, the tungsten deuteride molecule (WD) spectra have been observed in both TEXTOR and ASDEX Upgrade, which was believed to be the product of chemically assisted physical sputtering (CAPS), a new sputtering mechanism that has been proposed in recent years. In this paper, we report the spectroscopic observation of WD molecules in the EAST W divertor. The behaviors of WD molecules sputtering are compared with W atoms sputtering via the spectral measurements of the ro-vibrational band emission of WD 611 -> 6E+ in the spectral range between 673 nm and 678 nm and the WI line emission at 400.9 nm. The physical sputtering characters and chemical sputtering characters of WD molecule sputtering were confirmed in EAST. The measurements in EAST showed that there is an energy threshold for WD molecules sputtering and that the sputtering energy threshold of WD molecules is smaller than that of W atoms. Furthermore, the dependence of WD molecule sputtering efficiency (the absolute WD photon flux (PhWD) normalized to the particle flux (Gamma ion) reaching the target with a constant Te) on impact energy and heat flux were studied, presenting significantly different behaviors compared with W atom sputtering. In addition, it is found that the decrease of WD sputtering efficiency with the heat flux is accompanied by the rise of the photon flux of D delta (410.06 nm) normalized to the particle flux (Gamma ion) at the divertor target, which may imply the enhanced deuterium desorption at the W surface. The further increase of heat flux hitting the target surface could elevate the surface temperature and benefit the deuterium release from the surface, which may influence the formation of WD molecules at the surface layer.
资助项目	National Key Research and Development Program of China[2017YFE0301300] ; National Key Research and Development Program of China[2018YFE0303103] ; National Natural Science Foundation of China[12192283] ; National Natural Science Foundation of China[12022511] ; JSPS-CAS Bilateral Joint Research Project[GJHZ201984] ; Key Research Program of Frontier Sciences of CAS[ZDBS-LY-SLH010] ; Major Science and Technology Infrastructure Maintenance and Reconstruction Projects of Chinese Academy of Sciences (2021)
WOS关键词	EROSION
WOS研究方向	Nuclear Science & Technology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000877191400005
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; JSPS-CAS Bilateral Joint Research Project ; Key Research Program of Frontier Sciences of CAS ; Major Science and Technology Infrastructure Maintenance and Reconstruction Projects of Chinese Academy of Sciences (2021)
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/130039]
专题	中国科学院合肥物质科学研究院
通讯作者	Ding, F.
作者单位	1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Forschungszentrum Julich, Inst Energie & Klimaforschung Plasmaphys, Partner Trilateral Euregio Cluster TEC, D-52425 Julich, Germany 3.Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei 230031, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Q.,Ding, F.,Brezinsek, S.,et al. Spectroscopic investigation of the tungsten deuteride sputtering in the EAST divertor[J]. NUCLEAR MATERIALS AND ENERGY,2022,33.
APA	Zhang, Q..,Ding, F..,Brezinsek, S..,Yu, L..,Meng, L. Y..,...&East Team, E. A. S. T. Team.(2022).Spectroscopic investigation of the tungsten deuteride sputtering in the EAST divertor.NUCLEAR MATERIALS AND ENERGY,33.
MLA	Zhang, Q.,et al."Spectroscopic investigation of the tungsten deuteride sputtering in the EAST divertor".NUCLEAR MATERIALS AND ENERGY 33(2022).