The Accumulation of He on a W Surface During keV-He Irradiation: Cluster Dynamics Modeling

LI Yonggang (李永钢); ZHOU Wanghuai (周望怀); HUANG Liangfeng (黄良锋); NING Ronghui (宁荣辉); ZENG Zhi (曾雉)#; JU Xin (巨新)

doi:10.1088/1009-0630/14/7/13

Plasma Science and Technology > 2012 > 14(7): 624-628. > DOI: 10.1088/1009-0630/14/7/13

LI Yonggang (李永钢), ZHOU Wanghuai (周望怀), HUANG Liangfeng (黄良锋), NING Ronghui (宁荣辉), ZENG Zhi (曾雉)#, JU Xin (巨新). The Accumulation of He on a W Surface During keV-He Irradiation: Cluster Dynamics Modeling[J]. Plasma Science and Technology, 2012, 14(7): 624-628. DOI: 10.1088/1009-0630/14/7/13

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The Accumulation of He on a W Surface During keV-He Irradiation: Cluster Dynamics Modeling

1 Key Laboratory for Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China 2 Department of Physics, University of Science and Technology Beijing, Beijing 100083, China

Funds: Supported by the Special Funds for Major State Basic Research Project of China (973) (Nos. 2007CB925004 and 2008CB717802), the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KJCX2-YW-N35), the National Science Foundation of China (No. 11005124), the China Postdoctoral Science Foundation funded project (No. 20100470863), and Director Grants of CASHIPS. Part of the calculations were performed in the Center for Computational Science of CASHIPS.

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Received Date: May 16, 2011

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Abstract

Abstract

The accumulation of He on a W surface during keV-He ion irradiation has been simulated using cluster dynamics modeling. This is based mainly on rate theory and improved by involving different types of objects, adopting up-to-date parameters and complex reaction processes, as well as considering the diffusion process along with depth. These new features make the simulated results compare very well with the experimental ones. The accumulation and diffusion processes are analyzed, and the depth and size dependence of the He concentrations contributed by different types of He clusters are also discussed. The exploration of the trapping and diffusion effects of the He atoms is helpful in understanding the evolution of the damages in the near-surface of plasma-facing materials under He ion irradiation.
- cluster dynamics model,
- rate theory,
- helium in tungsten,
- accumulation and diffusion

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