Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 303, Issue -, Pages 156-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nimb.2012.11.029
Keywords
Tungsten; Helium; Fuzz; Molecular dynamics simulations; Clusters; Fusion reactor materials; ITER
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Funding
- European Communities under the contract of Association between EURATOM/Tekes
- Finnish National Graduate School in Material Physics
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When helium (He) escapes a fusion reactor plasma, a tungsten (W)-based divertor may, under some conditions, form a fuzz-like nano-morphology. This is a highly undesired phenomenon for the divertor, and is not well understood. We performed molecular dynamics simulations of high fluence He and also C-seeded He (He+C) irradiation on W, focusing on the effect of the high fluence, the temperature and the impurities on the onset of the structure formation. We concluded that MD reproduces the experimentally found square root of time dependence of the surface growth. The He atomic density decreases when increasing the number of He atoms in the cell. A higher temperature causes a larger bubble growth and desorption activity, specially for the pure He irradiation cases. It also it leads to W recrystallization for the He+C irradiation cases. Carbon acts as a local He trap for small clusters or single atoms and causes a larger loss of crystallinity of the W surface. (C) 2012 Elsevier B.V. All rights reserved.
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