Plasma and Fusion Research

Volume 13, 3403061 (2018)

Regular Articles

Triple Hybrid Simulation Method for Tungsten Fuzzy Nanostructure Formation
Atsushi M. ITO1,2), Arimichi TAKAYAMA1) and Hiroaki NAKAMURA1,3)
1)
Department of Helical Plasma Research, National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
Department of Fusion Science, The Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
3)
Department of Electrical Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
(Received 27 December 2017 / Accepted 11 March 2018 / Published 15 June 2018)

Abstract

To represent the formation of fuzzy nanostructures produced on a tungsten surface by exposure to a helium plasma, we have developed a hybrid simulation method that combines the binary collision approximation, molecular dynamics, and kinetic Monte Carlo calculations (BCA-MD-KMC). Since the MD code has been parallelized using the domain decomposition method (DDM) for execution in a multi-CPU environment, we developed the BCA code from scratch to mesh it efficiently with the DDM. The BCA-MD-KMC hybrid simulation code achieved a helium irradiation time of 0.1 seconds or longer, in spite of functioning at the level of atomic-scale models. In consequence, we have been able to observe the formation of concave and convex structures on a tungsten surface in the simulation.

Keywords

fuzz, helium plasma, hybrid simulation, binary collision, molecular dynamics, kinetic Monte Carlo, plasma-wall interaction

DOI: 10.1585/pfr.13.3403061

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