TY - JOUR
T1 - Hybrid simulation research on formation mechanism of tungsten nanostructure induced by helium plasma irradiation
AU - Ito, Atsushi M.
AU - Takayama, Arimichi
AU - Oda, Yasuhiro
AU - Tamura, Tomoyuki
AU - Kobayashi, Ryo
AU - Hattori, Tatsunori
AU - Ogata, Shuji
AU - Ohno, Noriyasu
AU - Kajita, Shin
AU - Yajima, Miyuki
AU - Noiri, Yasuyuki
AU - Yoshimoto, Yoshihide
AU - Saito, Seiki
AU - Takamura, Shuichi
AU - Murashima, Takahiro
AU - Miyamoto, Mitsutaka
AU - Nakamura, Hiroaki
N1 - Funding Information:
We would like thank to Dr. Naoaki Yoshida, Dr. Yoshio Ueda, Dr. Masayuki Tokitani and Dr. Heun Tae Lee for helpful discussions. Our work was supported by the National Institute of Natural Science (NINS) Program for Cross-Disciplinary Study, Grants-in-Aid for Scientific Research (Nos. 23710135 and 25249132 ) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan, and the National Institute for Fusion Science (NIFS) Collaboration Research programs (NIFS14KNTS028 and NIFS13KNSS037). Numerical simulations were carried out by using the Plasma Simulator at the NIFS and the HELIOS supercomputer system at Computational Simulation Centre of International Fusion Energy Research Centre (IFERC-CSC), Aomori, Japan, under the Broader Approach collaboration between Euratom and Japan, implemented by Fusion for Energy and JAEA.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/7/22
Y1 - 2015/7/22
N2 - Abstract 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.
AB - Abstract 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.
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U2 - 10.1016/j.jnucmat.2015.01.018
DO - 10.1016/j.jnucmat.2015.01.018
M3 - Article
AN - SCOPUS:84937724696
SN - 0022-3115
VL - 463
SP - 109
EP - 115
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
M1 - 48876
ER -