Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam

Comparison of defect formation in tungsten samples exposed only to a helium plasma and those exposed to both helium plasma and subsequent deuterium plasmas is performed via Doppler broadening spectroscopy in the positron annihilation technique (DBS-PA). The S parameters of tungsten samples after hel...

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Autores principales:	Yi-Ming Lyu, Yu-Ping Xu, Xiao-Chun Li, Xin Shen, Bo-Yu Wu, Chi-Shung Yip, Xiang Gao, Xiao-Dong Lin, Zhong-Shi Yang, Xing-Zhong Cao, Hai-Shan Zhou, Guang-Nan Luo
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Tungsten Helium Deuterium Defects EAST Nuclear engineering. Atomic power TK9001-9401
Acceso en línea:	https://doaj.org/article/bf39b7157ab8480793770ebc793cb573
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spelling	oai:doaj.org-article:bf39b7157ab8480793770ebc793cb5732021-11-24T04:31:26ZDefect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam2352-179110.1016/j.nme.2021.101094https://doaj.org/article/bf39b7157ab8480793770ebc793cb5732021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352179121001605https://doaj.org/toc/2352-1791Comparison of defect formation in tungsten samples exposed only to a helium plasma and those exposed to both helium plasma and subsequent deuterium plasmas is performed via Doppler broadening spectroscopy in the positron annihilation technique (DBS-PA). The S parameters of tungsten samples after helium plasma exposure increased with the increase of the incident fluence, which indicates that low energy helium plasma could induce the formation of defects such as nano-sized helium bubbles and dislocations in tungsten. The S parameters of samples exposed to helium incident fluence of 7.9 × 1021 He/m2 enhanced after deuterium plasmas exposure, indicating that low energy deuterium plasmas could form defects in tungsten too. Unexpectedly, deuterium plasmas exposure did not significantly influence the S parameters of the tungsten sample with helium incident fluence of 3.9 × 1022 He/m2, and reduced the S parameters of the tungsten sample with helium incident fluence of 7.9 × 1022 He/m2. These variations of S parameters could be associated with the occupation of nano-sized helium bubbles by deuterium atoms. This indicates possible competition between the increased density of vacancy-type defects by deuterium plasmas exposure and the filling of nano-sized helium bubbles by deuterium atoms, reducing detectability of these defects.Yi-Ming LyuYu-Ping XuXiao-Chun LiXin ShenBo-Yu WuChi-Shung YipXiang GaoXiao-Dong LinZhong-Shi YangXing-Zhong CaoHai-Shan ZhouGuang-Nan LuoElsevierarticleTungstenHeliumDeuteriumDefectsEASTNuclear engineering. Atomic powerTK9001-9401ENNuclear Materials and Energy, Vol 29, Iss , Pp 101094- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Tungsten Helium Deuterium Defects EAST Nuclear engineering. Atomic power TK9001-9401
spellingShingle	Tungsten Helium Deuterium Defects EAST Nuclear engineering. Atomic power TK9001-9401 Yi-Ming Lyu Yu-Ping Xu Xiao-Chun Li Xin Shen Bo-Yu Wu Chi-Shung Yip Xiang Gao Xiao-Dong Lin Zhong-Shi Yang Xing-Zhong Cao Hai-Shan Zhou Guang-Nan Luo Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
description	Comparison of defect formation in tungsten samples exposed only to a helium plasma and those exposed to both helium plasma and subsequent deuterium plasmas is performed via Doppler broadening spectroscopy in the positron annihilation technique (DBS-PA). The S parameters of tungsten samples after helium plasma exposure increased with the increase of the incident fluence, which indicates that low energy helium plasma could induce the formation of defects such as nano-sized helium bubbles and dislocations in tungsten. The S parameters of samples exposed to helium incident fluence of 7.9 × 1021 He/m2 enhanced after deuterium plasmas exposure, indicating that low energy deuterium plasmas could form defects in tungsten too. Unexpectedly, deuterium plasmas exposure did not significantly influence the S parameters of the tungsten sample with helium incident fluence of 3.9 × 1022 He/m2, and reduced the S parameters of the tungsten sample with helium incident fluence of 7.9 × 1022 He/m2. These variations of S parameters could be associated with the occupation of nano-sized helium bubbles by deuterium atoms. This indicates possible competition between the increased density of vacancy-type defects by deuterium plasmas exposure and the filling of nano-sized helium bubbles by deuterium atoms, reducing detectability of these defects.
format	article
author	Yi-Ming Lyu Yu-Ping Xu Xiao-Chun Li Xin Shen Bo-Yu Wu Chi-Shung Yip Xiang Gao Xiao-Dong Lin Zhong-Shi Yang Xing-Zhong Cao Hai-Shan Zhou Guang-Nan Luo
author_facet	Yi-Ming Lyu Yu-Ping Xu Xiao-Chun Li Xin Shen Bo-Yu Wu Chi-Shung Yip Xiang Gao Xiao-Dong Lin Zhong-Shi Yang Xing-Zhong Cao Hai-Shan Zhou Guang-Nan Luo
author_sort	Yi-Ming Lyu
title	Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
title_short	Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
title_full	Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
title_fullStr	Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
title_full_unstemmed	Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
title_sort	defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/bf39b7157ab8480793770ebc793cb573
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Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam

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