MD and SCA simulations of He and H bombardment of fuzz in bcc elements

Show simple item record Klaver, T. P. C. Zhang, S. Nordlund, K. 2018-01-26T13:12:01Z 2018-01-26T13:12:01Z 2017-08
dc.identifier.citation Klaver , T P C , Zhang , S & Nordlund , K 2017 , ' MD and SCA simulations of He and H bombardment of fuzz in bcc elements ' , Journal of Nuclear Materials , vol. 492 , pp. 113-121 .
dc.identifier.other PURE: 88252795
dc.identifier.other PURE UUID: ef30ce1e-19ce-4aa1-9fa9-1e45f020a366
dc.identifier.other WOS: 000404701300015
dc.identifier.other Scopus: 85019951723
dc.identifier.other ORCID: /0000-0001-6244-1942/work/39203301
dc.description.abstract We present results of MD simulations of low energy He ion bombardment of low density fuzz in bcc elements. He ions can penetrate several micrometers into sparse fuzz, which allows for a sufficient He flux through it to grow the fuzz further. He kinetic energy falls off exponentially with penetration depth. A BCA code was used to carry out the same ion bombardment on the same fuzz structures as in MD simulations, but with simpler, 10 million times faster calculations. Despite the poor theoretical basis of the BCA at low ion energies, and the use of somewhat different potentials in MD and BCA calculations, the ion penetration depths predicted by BCA are only similar to 12% less than those predicted by MD. The MD-BCA differences are highly systematic and trends in the results of the two methods are very similar. We have carried out more than 200 BCA calculation runs of ion bombardment of fuzz, in which parameters in the ion bombardment process were varied. For most parameters, the results show that the ion bombardment process is quite generic. The ion species (He or H), ion mass, fuzz element (W, Ta, Mo, Fe) and fuzz element lattice parameter turned out to have a modest influence on ion penetration depths at most. An off-normal angle of incidence strongly reduces the ion penetration depth. Increasing the ion energy increases the ion penetration, but the rate by which ion energy drops off at high ion energies follows the same exponential pattern as at lower energies. (C) 2017 Elsevier B.V. All rights reserved. en
dc.format.extent 9
dc.language.iso eng
dc.relation.ispartof Journal of Nuclear Materials
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title MD and SCA simulations of He and H bombardment of fuzz in bcc elements en
dc.type Article
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0022-3115
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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