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A cluster dynamics model for Accumulation of Helium in Tungsten under Helium Ions and Neutron Irradiation

Communications in Computational Physics 2012年第5期11卷 1547-1568页

作者： Y.G.Li W.H.Zhou R.H.Ning L.F.Huang Z.Zeng X.Ju Key Laboratory for Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei230031China Department of Physics University of Science and Technology BeijingBeijing 100083China

A cluster dynamics model based on rate theory has been developed to describe the accumulation and diffusion processes of helium in tungsten under helium implantation alone or synergistic irradiationwith neutron,by involving different types of objects,adopting up-to-date parameters and complex reaction processes as well as considering the diffusion process along with *** calculated results under different conditions are in good agreement with experiments much *** model describes the behavior of helium in tungsten within 2D space of defect type/size and depth on different ions incident conditions(energies and fluences)and material conditions(system temperature and existent sinks),by including the synergistic effect of helium-neutron irradiations and the influence of inherent sinks(dislocation lines and grain boundaries).The model,coded as IRadMat,would be universally applicable to the evolution of defects for ions/neutron irradiated on plasma-facing materials.

关键词： cluster dynamics model rate theory helium and neutron irradiation tungsten accumulation and diffusion

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The Accumulation of He on a W Surface During keV-He Irradiation:cluster dynamics modeling

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Plasma Science and Technology 2012年第7期14卷 624-628页

作者：李永钢周望怀黄良锋宁荣辉曾雉巨新 Key Laboratory for Materials Physics Institute of Solid State PhysicsChinese Academy of Sciences Department of Physics University of Science and Technology Beijing

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 is 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.

关键词： cluster dynamics model rate diffusion theory helium in tungsten accumulation and

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