Molecular dynamics investigation of the configuration and shape of helium clusters in tungsten
JL Wang and ZC Guo and WQ Dang and DP Liu, NUCLEAR FUSION, 60, 126015 (2020).
The stable configuration and shape of a helium cluster in tungsten are investigated with the molecular dynamics method. It is found that the configuration of the helium cluster tends to form a near-spherical polyhedron. At a high temperature, the He-n cluster for n < 100 has enough time to evolve into a spherical structure even after coalescing between two helium clusters, while the large helium cluster could retain a rod-like or other shape for a long time. The formation mechanism of fuzz on tungsten surfaces is still unclear. Whether the shape of helium clusters is reasonable in simulations may have a significant effect on the formation of fuzz. Our results provide important references for Monte Carlo simulations.
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