Blister-dominated retention mechanism in tungsten exposed to high-fluence deuterium plasma

doi:10.1088/1741-4326/abb600

	Blister-dominated retention mechanism in tungsten exposed to high-fluence deuterium plasma
	Liu, Mi 4,5; Guo, Wangguo 6; Cheng, Long 4,5; Wang, Jun 7; Wang, Shiwei 4,5; Yin, Hao 4,5; Wang, Ting 4,5; Huang, Yuhua 4,5; Yuan, Yue 4,5; Schwarz-Selinger, Thomas 1
刊名	NUCLEAR FUSION
	2020-12-01
卷号	60
关键词	tungsten deuterium plasma high fluence blister deuterium retention
ISSN号	0029-5515
DOI	10.1088/1741-4326/abb600
通讯作者	Cheng, Long(LCheng@buaa.edu.cn)
英文摘要	To investigate the effect of blistering on hydrogen isotope (HI) retention, a series of deuterium plasma exposures were performed using recrystallized tungsten samples at 500 K with high fluences up to 1.0 x 10(28)ions m(-2)in the linear plasma device STEP. An increase of blister density and deuterium retention was observed with increasing plasma fluence. Based on the simulation of the thermal desorption spectra using TMAP, defects with different detrapping energies are found to be located at a depth of tens of microns, which coincides with the depth of the grain boundaries (GBs) close to the surface. The defect characterizations using transmission electron microscopy and positron annihilation Doppler broadening identified the defects as dislocation type and vacancy type, which were created by blistering. It is suggested that these defects can diffuse deep into the material, and the interaction between the diffusion of the defects and GBs causes a peculiar deuterium desorption spectrum over plasma fluences. Additionally, these blister-induced defects are the main source of deuterium retention. Regarding the effect of the blister-induced defects on deuterium retention, a blister-dominated retention mechanism is proposed to describe HI retention in conditions when blistering is severe as in this study. This investigation provides a new insight into the effect of blistering on retention and the modelling of retention in a tokamak edge plasma environment.
资助项目	National Nature Science Foundation of China[51720105006] ; National Nature Science Foundation of China[11805007] ; National Nature Science Foundation of China[11675009] ; Users with Excellence Project of Hefei Science Center of CAS[2018HSC-UE006]
WOS关键词	LOW-ENERGY ; SURFACE-MORPHOLOGY ; VACANCY FORMATION ; HYDROGEN ; DIFFUSION ; DISLOCATION ; MICROSTRUCTURE ; ABSORPTION ; DEPENDENCE ; BEAM
WOS研究方向	Physics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000580955500001
资助机构	National Nature Science Foundation of China ; Users with Excellence Project of Hefei Science Center of CAS
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/104672]
专题	中国科学院合肥物质科学研究院
通讯作者	Cheng, Long
作者单位	1.Max Planck Inst Plasma Phys, D-85748 Garching, Germany 2.ITER Org, Route Vinon sur Verdon,CS90 046, F-13067 St Paul Les Durance, France 3.Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China 4.Beihang Univ, Sch Phys, Beijing 100191, Peoples R China 5.Beihang Univ, Beijing Key Lab Adv Nucl Mat & Phys, Beijing 100191, Peoples R China 6.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 7.Sun Yat Sen Univ, Sch Phys, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China
推荐引用方式 GB/T 7714	Liu, Mi,Guo, Wangguo,Cheng, Long,et al. Blister-dominated retention mechanism in tungsten exposed to high-fluence deuterium plasma[J]. NUCLEAR FUSION,2020,60.
APA	Liu, Mi.,Guo, Wangguo.,Cheng, Long.,Wang, Jun.,Wang, Shiwei.,...&Lu, Guang-Hong.(2020).Blister-dominated retention mechanism in tungsten exposed to high-fluence deuterium plasma.NUCLEAR FUSION,60.
MLA	Liu, Mi,et al."Blister-dominated retention mechanism in tungsten exposed to high-fluence deuterium plasma".NUCLEAR FUSION 60(2020).