Hybrid simulation research on formation mechanism of tungsten nanostructure induced by helium plasma irradiation

Autor:	Arimichi Takayama, Mitsutaka Miyamoto, Tatsunori Hattori, Ryo Kobayashi, Yasuyuki Noiri, Shin Kajita, Shuji Ogata, Takahiro Murashima, Hiroaki Nakamura, Yoshihide Yoshimoto, Seiki Saito, Y. Oda, Tomoyuki Tamura, Noriyasu Ohno, Atsushi Ito, Miyuki Yajima, Shuichi Takamura
Rok vydání:	2015
Předmět:	Nuclear and High Energy Physics Nanostructure Materials science Divertor Bubble chemistry.chemical_element Nanotechnology Tungsten Molecular physics Molecular dynamics Nuclear Energy and Engineering chemistry Nuclear fusion General Materials Science Irradiation Helium
Zdroj:	Journal of Nuclear Materials. 463:109-115
ISSN:	0022-3115
DOI:	10.1016/j.jnucmat.2015.01.018
Popis:	The generation of tungsten fuzzy nanostructure by exposure to helium plasma is one of the important problems for the use of tungsten material as divertor plates in nuclear fusion reactors. In the present paper, the formation mechanisms of the helium bubble and the tungsten fuzzy nanostructure were investigated by using several simulation methods. We proposed the four-step process which is composed of penetration step, diffusion and agglomeration step, helium bubble growth step, and fuzzy nanostructure formation step. As the fourth step, the formation of the tungsten fuzzy nanostructure was successfully reproduced by newly developed hybrid simulation combining between molecular dynamics and Monte-Carlo method. The formation mechanism of tungsten fuzzy nanostructure observed by the hybrid simulation is that concavity and convexity of the surface are enhanced by the bursting of helium bubbles in the region around the concavity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::615a3b5b9c53a1a3038a0afb3162c0ee https://doi.org/10.1016/j.jnucmat.2015.01.018 Zobrazit plný text záznamu Full Text from ScienceDirect