Temperature dependence of underdense nanostructure formation in tungsten under helium irradiation

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Valles , G , Martin-Bragado , I , Nordlund , K , Lasa , A , Björkas , C , Safi , E , Perlado , J M & Rivera , A 2017 , ' Temperature dependence of underdense nanostructure formation in tungsten under helium irradiation ' , Journal of Nuclear Materials , vol. 490 , pp. 108-114 . https://doi.org/10.1016/j.jnucmat.2017.04.021

Title: Temperature dependence of underdense nanostructure formation in tungsten under helium irradiation
Author: Valles, G.; Martin-Bragado, I.; Nordlund, K.; Lasa, A.; Björkas, C.; Safi, E.; Perlado, J. M.; Rivera, A.
Contributor organization: Department of Physics
Date: 2017-07
Language: eng
Number of pages: 7
Belongs to series: Journal of Nuclear Materials
ISSN: 0022-3115
DOI: https://doi.org/10.1016/j.jnucmat.2017.04.021
URI: http://hdl.handle.net/10138/308765
Abstract: Recently, tungsten has been found to form a highly underdense nanostructured morphology ("W fuzz") when bombarded by an intense flux of He ions, but only in the temperature window 900-2000 K. Using object kinetic Monte Carlo simulations (pseudo-3D simulations) parameterized from first principles, we show that this temperature dependence can be understood based on He and point defect clustering, cluster growth, and detrapping reactions. At low temperatures (2300 K), all He is detrapped from clusters, preventing the formation of the large clusters that lead to fuzz growth in the intermediate temperature range. (C) 2017 Elsevier B.V. All rights reserved.
Subject: Tungsten
Helium irradiation
Fuzz nanostructures
OKMC simulations
Temperature
LASER-PULSE IRRADIATION
MOLECULAR-DYNAMICS
BUBBLE FORMATION
PLASMA
SIMULATIONS
RETENTION
EVOLUTION
CLUSTERS
SURFACES
MODEL
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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